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Articoli di riviste sul tema "3d photography"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 3 febbraio 2022

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1

Schuhr, W., e J. D. Lee. "Filling gaps in cultural heritage documentation by 3D photography". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-5/W7 (13 agosto 2015): 365–69. http://dx.doi.org/10.5194/isprsarchives-xl-5-w7-365-2015.

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This contribution promotes 3D photography as an important tool to obtain objective object information. Keeping mainly in mind World Heritage documentation as well as Heritage protection, it is another intention of this paper, to stimulate the interest in applications of 3D photography for professionals as well as for amateurs. In addition this is also an activity report of the international CIPA task group 3. The main part of this paper starts with “Digging the treasure of existing international 3D photography”. This does not only belong to tangible but also to intangible Cultural Heritage. 3D photography clearly supports the recording, the visualization, the preservation and the restoration of architectural and archaeological objects. Therefore the use of 3D photography in C.H. should increase on an international level. The presented samples in 3D represent a voluminous, almost partly “forgotten treasure” of international archives for 3D photography. <br><br> The next chapter is on “Promoting new 3D photography in Cultural Heritage”. Though 3D photographs are a well-established basic photographic and photogrammetric tool, even suited to provide “near real” documentation, they are still a matter of research and improvement. Beside the use of 3D cameras even single lenses cameras are very much suited for photographic 3D documentation purposes in Cultural Heritage. <br><br> Currently at the Faculty of Civil Engineering of the University of Applied Sciences Magdeburg-Stendal, low altitude aerial photography is exposed from a maximum height of 13m, using a hand hold carbon telescope rod. The use of this “huge selfie stick” is also an (international) recommendation, to expose high resolution 3D photography of monuments under expedition conditions. In addition to the carbon rod recently a captive balloon and a hexacopter UAV- platform is in use, mainly to take better synoptically (extremely low altitude, ground truth) aerial photography. Additional experiments with respect to “easy geometry” and to multistage concepts of 3D photographs in Cultural Heritage just started. Furthermore a revised list of the 3D visualization principles, claiming completeness, has been carried out. Beside others in an outlook <br><br> *It is highly recommended, to list every historical and current stereo view with relevance to Cultural Heritage in a global Monument Information System (MIS), like in google earth. <br><br> *3D photographs seem to be very suited, to complete and/or at least partly to replace manual archaeological sketches. In this concern the still underestimated 3D effect will be demonstrated, which even allows, e.g., the spatial perception of extremely small scratches etc... <br><br> *A consequent dealing with 3D Technology even seems to indicate, currently we experience the beginning of a new age of “real 3DPC- screens“, which at least could add or even partly replace the conventional 2D screens. Here the spatial visualization is verified without glasses in an all-around vitreous body. In this respect nowadays widespread lasered crystals showing monuments are identified as “Early Bird“ 3D products, which, due to low resolution and contrast and due to lack of color, currently might even remember to the status of the invention of photography by Niepce (1827), but seem to promise a great future also in 3D Cultural Heritage documentation. <br><br> *Last not least 3D printers more and more seem to conquer the IT-market, obviously showing an international competition.
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Latto, Richard, e Bernard Harper. "The Non-Realistic Nature of Photography: Further Reasons Why Turner Was Wrong". Leonardo 40, n. 3 (giugno 2007): 243–47. http://dx.doi.org/10.1162/leon.2007.40.3.243.

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The authors discuss the limitations of photography in producing representations that lead to the accurate perception of shapes. In particular, they consider two situations in which the photographic representation, although an accurate reproduction of the geometry of the two-dimensional image in the eye, does not capture the way human vision changes this geometry to produce a three-dimensionally accurate perception. When looking at a photograph, the viewer's uncertainty of the camera-to-subject distance and the fact that, unnaturally, a photograph presents almost exactly the same view of an object to the two eyes result in substantially distorted perceptions. These most commonly result in a perceived flattening and fattening of the 3D shape of the object being photographed.
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Hedman, Peter, Suhib Alsisan, Richard Szeliski e Johannes Kopf. "Casual 3D photography". ACM Transactions on Graphics 36, n. 6 (20 novembre 2017): 1–15. http://dx.doi.org/10.1145/3130800.3130828.

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Hedman, Peter, e Johannes Kopf. "Instant 3D photography". ACM Transactions on Graphics 37, n. 4 (10 agosto 2018): 1–12. http://dx.doi.org/10.1145/3197517.3201384.

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Blade, Richard A. "Stereographic Photography on the Computer". International Journal of Virtual Reality 1, n. 2 (1 gennaio 1995): 40–42. http://dx.doi.org/10.20870/ijvr.1995.1.2.2605.

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The author provides a semi-technical review of the principles of stereographic photography usable without special equipment and discusses the current methods of viewing stereo photographs as computer images. Included is a discussion of recently developed commercial software called Wireframe Express that allows two or more photographic images of an object, taken at different but arbitrary positions, to be joined into a composite 3D model for stereographic viewing from any angle. Among other things, this recent technology allows the virtual reality simulation of historic buildings and rooms to be constructed from currently existing photographs. Illustrations of the points are made with images provided on the CD-ROM.
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Setyanto, Daniar Wikan, Puri Sulistiyawati e Erisa Adyati Rahmasari. "Implementasi Nirmana pada Fotografi Portraiture 3D Anaglyph". ANDHARUPA: Jurnal Desain Komunikasi Visual & Multimedia 4, n. 02 (28 agosto 2018): 143–56. http://dx.doi.org/10.33633/andharupa.v4i02.1790.

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AbstrakImplementasi teknologi 3D saat ini lebih banyak digunakan di dunia perfilman dan animasi, padahal teknologi tersebut memiliki potensi untuk dikembangkan dalam fotografi, khususnya fotografi 3D. Sampai saat ini masih sedikit fotografer yang mendalami dan tertarik untuk melakukan eksperimen. Fotografi 3D menyimpan potensi untuk dikembangkan karena implementasi 3D dapat membuat media foto tersebut menjadi sangat unik. Fotografi sendiri merupakan salah satu dari bidang ilmu pengetahuan, teknologi dan seni (IPTEKS), oleh karena itu ilmu fotografi seharusnya bergerak dinamis mengikuti perkembangan teknologi. Melalui penelitian yang mengarah pada eksperimental fotografi dan citra 3D diharapkan dapat memberikan kontribusi kebaharuan dalam fotografi. Karya fotografi juga memerlukan sentuhan dari nirmana karena nirmana merupakan ilmu yang mempelajari unsur-unsur tata rupa. Tujuan penelitian ini adalah menghasilkan karya-karya fotografi portraiture nirmana dengan teknologi 3D anaglyph. Dengan menggunakan metodologi eksperimental, penelitian ini mengeksplorasi teknik penciptaan fotografi 3D anaglyph. Luaran karya fotografi 3D tersebut menjadi bukti bahwa sisi estetis nirmana dan teknologi fotografi 3D anaglyph merupakan ilmu yang saling berhubungan dan implementatif satu sama lain secara khusus dengan ilmu fotografi. Kata kunci : 3D anaglyph, fotografi, nirmana, portraiture AbstractThe implementation of 3D technology recently is more applicated in film and animation, whereas that technology has big potential to develop in photography, especially the 3D photography genre. Until now, only a few photographers have focused on this genre and are interested in conducting further experiments. 3D photography still has the potential to be developed because 3D applications can produce unique photos. Photography is one of the science and technology fields, therefore photography should move dynamically in line with technological developments. Through research that leads to experimental photography and 3D imagery is expected to contribute novelty in photography. Photographic work also requires nirmana touch because nirmana learns the elements of fine arts. The purpose of this research is to produce portraiture photography works of nirmana with anaglyph 3D technology. By using the experimental methodology, this study explores 3D anaglyph photography creation techniques. The output of 3D photography is evidence that nirmana aesthetic and 3D photography technology are interrelated and implementative especially with the science of photography. Keywords : 3D anaglyph, photography, nirmana, portraiture
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Fathoni, Ahmad Faisal Choiril Anam, e Dermawan Syamsuddin. "Perbandingan Metode Depth of Field pada Lensa Kamera Fotografi dengan Efek Lensa pada Software Animasi". Humaniora 4, n. 1 (30 aprile 2013): 177. http://dx.doi.org/10.21512/humaniora.v4i1.3427.

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The knowledge of photography becomes fundamental importance in the understanding of digital cinematography. The work of a good photography is a blend of knowledge and photographic ability (skill) correctly. By learning photography properly, it allows an animator or digital art workers to apply some standard cinematography as well. By knowing the comparison between photography with "photographic" in 3D animation, animators will be easier to create a digital aesthetic standard with the help of the software. This paper discusses the comparison of the use of photographic camera lenses and camera parameters found in animation software 3D Studio Max. The final form is the camera pictures and parameters of used lens with the results of rendering images with the software-related parameter.
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Baid, Anisha. "Wild Life". Membrana Journal of Photography, Vol. 3, no. 1 (2018): 20–25. http://dx.doi.org/10.47659/m4.020.art.

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Wild Life is a series of augmented photographs of animals and insects placed in vacant, overgrown spaces in suburban Bangalore. Taken through mobile AR apps like Holo and Augment, these photographs (or screenshots) situate virtual bodies within the frame of the mobile camera – creating something in between a document and fiction. The work investigates these processes of augmentation, which enable 3D representations of things in the real/physical world to be projected back into physical space that are then photographed. The larger phenomenon of AR photography also complicates traditional notions of “immersive” media – forcing one to interact with their environments. This essay reflects on the implications of mobile AR photography on the image and the referent. Through a phenomenological reading of and immersion into popular uses of mobile AR (like the game Pokémon Go), the essay is an observation of the convoluted relationships evoked between augmented bodies, their environments and the screens on which they manifest. Keywords: digital image, documentary, mobile AR, photography, Pokémon Go
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9

Guesdon, Céline. "Toward a New Kind of Image: Photosynthegraphy". Leonardo 39, n. 3 (giugno 2006): 193–97. http://dx.doi.org/10.1162/leon.2006.39.3.193.

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The author presents a new way of creating images that taps into new interrogations of images. The link between art and technology lies at the heart of her research. She uses a prototype camera that makes it possible to generate a 3D mesh starting from a single photograph. She presents various photographic creations begun during earlier studies in order to explain how her work leads to the perception of photography as volume-images.
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Xue, Xiaowei, Chunxue Wu, Ze Sun, Yan Wu e Neal Xiong. "Vegetation Greening for Winter Oblique Photography Using Cycle-Consistence Adversarial Networks". Symmetry 10, n. 7 (20 luglio 2018): 294. http://dx.doi.org/10.3390/sym10070294.

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A 3D city model is critical for the construction of a digital city. One of the methods of building a 3D city model is tilt photogrammetry. In this method, oblique photography is crucial for generating the model because the visual quality of photography directly impacts the model’s visual effect. Yet, sometimes, oblique photography does not have good visual quality due to a bad season or defective photographic equipment. For example, for oblique photography taken in winter, vegetation is brown. If this photography is employed to generate the 3D model, the result would be bad visually. Yet, common methods for vegetation greening in oblique photography rely on the assistance of the infrared band, which is not available sometimes. Thus, a method for vegetation greening in winter oblique photography without the infrared band is required, which is proposed in this paper. The method was inspired by the work on CycleGAN (Cycle-consistence Adversarial Networks). In brief, the problem of turning vegetation green in winter oblique photography is considered as a style transfer problem. Summer oblique photography generally has green vegetation. By applying CycleGAN, winter oblique photography can be transferred to summer oblique photography, and the vegetation can turn green. Yet, due to the existence of “checkerboard artifacts”, the original result cannot be applied for real production. To reduce artifacts, the generator of CycleGAN is modified. As the final results suggest, the proposed method unlocks the bottleneck of vegetation greening when the infrared band is not available and artifacts are reduced.
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Lien, Yao-Nan. "Mobilizing Digital Museums with 3D Photography". International Journal of Computing and Digital Systems 5, n. 1 (1 gennaio 2016): 97–104. http://dx.doi.org/10.12785/ijcds/050109.

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Hogendoorn, G., C. Lemoine, R. Rissmann e J. Burggraaf. "3D photography for Skin lesion Quantification". Clinical Therapeutics 37, n. 8 (agosto 2015): e99. http://dx.doi.org/10.1016/j.clinthera.2015.05.284.

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Nicholson, Paul T. "Three-dimensional imaging in archaeology: its history and future". Antiquity 75, n. 288 (giugno 2001): 402–9. http://dx.doi.org/10.1017/s0003598x00061056.

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Whilst digital cameras and computer graphics are starting to be used in archaeological recording, stereoscopic photography tends to be overlooked. This technique has been used successfully in three recent projects and could be beneficial as a means of 3D photographic recording.
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Matusik, Wojciech, Hanspeter Pfister, Addy Ngan, Paul Beardsley, Remo Ziegler e Leonard McMillan. "Image-based 3D photography using opacity hulls". ACM Transactions on Graphics 21, n. 3 (luglio 2002): 427–37. http://dx.doi.org/10.1145/566654.566599.

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Velho, Luiz, e Jonas Sossai Jr. "Projective texture atlas construction for 3D photography". Visual Computer 23, n. 9-11 (15 giugno 2007): 621–29. http://dx.doi.org/10.1007/s00371-007-0150-7.

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Mena-Chalco, Jesús P., Ives Macêdo, Luiz Velho e Roberto M. Cesar. "3D face computational photography using PCA spaces". Visual Computer 25, n. 10 (3 giugno 2009): 899–909. http://dx.doi.org/10.1007/s00371-009-0373-x.

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Neumann, Jan, Cornelia Fermüller e Yiannis Aloimonos. "A hierarchy of cameras for 3D photography". Computer Vision and Image Understanding 96, n. 3 (dicembre 2004): 274–93. http://dx.doi.org/10.1016/j.cviu.2004.03.013.

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18

Favaretto, Maddalena, Danya F. Vears e Pascal Borry. "On the Epistemic Status of Prenatal Ultrasound: Are Ultrasound Scans Photographic Pictures?" Journal of Medicine and Philosophy: A Forum for Bioethics and Philosophy of Medicine 45, n. 2 (14 gennaio 2020): 231–50. http://dx.doi.org/10.1093/jmp/jhz039.

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Abstract Medical imaging is predominantly a visual field. In this context, prenatal ultrasound images assume intense social, ethical, and psychological significance by virtue of the subject they represent: the fetus. This feature, along with the sophistication introduced by three-dimensional (3D) ultrasound imaging that allows improved visualization of the fetus, has contributed to the common impression that prenatal ultrasound scans are like photographs of the fetus. In this article we discuss the consistency of such a comparison. First, we investigate the epistemic role of both analogic and digital photographic images as visual information-providing representations holding a high degree of objectivity. Second, we examine the structure and process of production of ultrasound scans and argue that a comparison between two-dimensional (2D) ultrasound and photography is justified. This is in contrast to 3D ultrasound images that, due to the intensive mathematical processing involved in their production, present some structural issues that obfuscate their ontological and epistemic status.
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Irace, Alexandria L., Anne Koivuholma, Eero Huotilainen, Jaana Hagström, Katri Aro, Mika Salmi, Antti Markkola, Heli Sistonen, Timo Atula e Antti A. Mäkitie. "Additive Manufacturing of Resected Oral and Oropharyngeal Tissue: A Pilot Study". International Journal of Environmental Research and Public Health 18, n. 3 (21 gennaio 2021): 911. http://dx.doi.org/10.3390/ijerph18030911.

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Better visualization of tumor structure and orientation are needed in the postoperative setting. We aimed to assess the feasibility of a system in which oral and oropharyngeal tumors are resected, photographed, 3D modeled, and printed using additive manufacturing techniques. Three patients diagnosed with oral/oropharyngeal cancer were included. All patients underwent preoperative magnetic resonance imaging followed by resection. In the operating room (OR), the resected tissue block was photographed using a smartphone. Digital photos were imported into Agisoft Photoscan to produce a digital 3D model of the resected tissue. Physical models were then printed using binder jetting techniques. The aforementioned process was applied in pilot cases including carcinomas of the tongue and larynx. The number of photographs taken for each case ranged from 63 to 195. The printing time for the physical models ranged from 2 to 9 h, costs ranging from 25 to 141 EUR (28 to 161 USD). Digital photography may be used to additively manufacture models of resected oral/oropharyngeal tumors in an easy, accessible and efficient fashion. The model may be used in interdisciplinary discussion regarding postoperative care to improve understanding and collaboration, but further investigation in prospective studies is required.
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Ciobanu, Octavian, e Mariana Rotariu. "Photogrammetric Scanning and Applications in Medicine". Applied Mechanics and Materials 657 (ottobre 2014): 579–83. http://dx.doi.org/10.4028/www.scientific.net/amm.657.579.

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Creating 3D models automatically from photographs is a relatively new technology. This sort of 3D scanning is based on the principles of photogrammetry, similar in methodology to panoramic photography; the photos are taken of one object and from different positions of camera in order to replicate the object. Paper approaches different typical anatomic surfaces by photogrammetric scanning and 3D reconstruction. Documented surfaces include anatomic surfaces like foot, upper body, head, and ear. The aim is to give users recommendations, which body part is suited best for this type of scanning, or even if a combination of photogrammetry and another 3D scanning technique is advisable. Comments like possible medical applications, quality of the results, required equipment and occurring problems are to be considered.
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Frank, Nicole, Joerg Beinemann, Florian M. Thieringer, Benito K. Benitez, Christoph Kunz, Raphael Guzman e Jehuda Soleman. "The need for overcorrection: evaluation of computer-assisted, virtually planned, fronto-orbital advancement using postoperative 3D photography". Neurosurgical Focus 50, n. 4 (aprile 2021): E5. http://dx.doi.org/10.3171/2021.1.focus201026.

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OBJECTIVE The main indication for craniofacial remodeling of craniosynostosis is to correct the deformity, but potential increased intracranial pressure resulting in neurocognitive damage and neuropsychological disadvantages cannot be neglected. The relapse rate after fronto-orbital advancement (FOA) seems to be high; however, to date, objective measurement techniques do not exist. The aim of this study was to quantify the outcome of FOA using computer-assisted design (CAD) and computer-assisted manufacturing (CAM) to create individualized 3D-printed templates for correction of craniosynostosis, using postoperative 3D photographic head and face surface scans during follow-up. METHODS The authors included all patients who underwent FOA between 2014 and 2020 with individualized, CAD/CAM-based, 3D-printed templates and received postoperative 3D photographic face and head scans at follow-up. Since 2016, the authors have routinely planned an additional “overcorrection” of 3 mm to the CAD-based FOA correction of the affected side(s). The virtually planned supraorbital angle for FOA correction was compared with the postoperative supraorbital angle measured on postoperative 3D photographic head and face surface scans. The primary outcome was the delta between the planned CAD/CAM FOA correction and that achieved based on 3D photographs. Secondary outcomes included outcomes with and those without “overcorrection,” time of surgery, blood loss, and morbidity. RESULTS Short-term follow-up (mean 9 months after surgery; 14 patients) showed a delta of 12° between the planned and achieved supraorbital angle. Long-term follow-up (mean 23 months; 8 patients) showed stagnant supraorbital angles without a significant increase in relapse. Postsurgical supraorbital angles after an additionally planned overcorrection (of 3 mm) of the affected side showed a mean delta of 11° versus 14° without overcorrection. The perioperative and postoperative complication rates of the whole cohort (n = 36) were very low, and the mean (SD) intraoperative blood loss was 128 (60) ml with a mean (SD) transfused red blood cell volume of 133 (67) ml. CONCLUSIONS Postoperative measurement of the applied FOA on 3D photographs is a feasible and objective method for assessment of surgical results. The delta between the FOA correction planned with CAD/CAM and the achieved correction can be analyzed on postoperative 3D photographs. In the future, calculation of the amount of “overcorrection” needed to avoid relapse of the affected side(s) after FOA may be possible with the aid of these techniques.
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Zhu, X., G. Pang e C. Chen. "RESEARCH AND APPLICATION OF HISTORICAL 3D MODELING BASED ON ARCHIVED NON-OBLIQUE AERIAL PHOTOS". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2020 (12 agosto 2020): 555–60. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2020-555-2020.

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Abstract. Nowadays, the oblique and multi-view, large-overlap aerial photography and airborne LiDAR are the main sources to build the 3D scene model. However, most of our archived aerial photos are acquired by non-oblique, normal photography. Because of low resolution, low overlay and poor model texture, there were less relative research and application. With the development of pixel-level matching technology, especially the application of Semi-Global Matching (SGM) and Multi-View Stereo (MVS) algorithm, the normal (non-oblique, non-large overlap) aerial photos could also be explored to restore the dense Digital Surface Model (DSM) and 3D scene model. In this paper, the method of the 3D scene modelling with the non-oblique aerial photos are summarized into 4 steps consisting of Data preprocessing, Ground Control Points (GCPs) collection and aerial triangulation (AT), DSM extraction and editing, 3D modelling and visualization. For the archived non-oblique aerial photos, including the aerial photographic films, digital frame photos and push-broom aerial data, the key steps of the 3D modelling method with these non-oblique aerial photos are discussed. Based on the experiments, the method can effectively explore the archived normal aerial data for large range restoration, 3D restoration, time series change detection and etc., providing new valuable spatio-temporal data for the urban historical research.
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Wang, Jiang-An, Huang-Te Ma, Chun-Mei Wang e Yong-Jie He. "Fast 3D reconstruction method based on UAV photography". ETRI Journal 40, n. 6 (21 ottobre 2018): 788–93. http://dx.doi.org/10.4218/etrij.2017-0298.

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Lowe, Philippa, e Nicholas J. Lowe. "3D Photography and lip filler: A novel assay". Journal of Cosmetic and Laser Therapy 9, n. 4 (gennaio 2007): 237–40. http://dx.doi.org/10.1080/14764170701516336.

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Savage, J. M., e S. L. A. Jeffery. "Use of 3D photography in complex-wound assessment". Journal of Wound Care 22, n. 3 (marzo 2013): 156–60. http://dx.doi.org/10.12968/jowc.2013.22.3.156.

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Donatsch, Daniel, Siavash Arjomand Bigdeli, Philippe Robert e Matthias Zwicker. "Hand-held 3D light field photography and applications". Visual Computer 30, n. 6-8 (15 maggio 2014): 897–907. http://dx.doi.org/10.1007/s00371-014-0979-5.

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Schaaf, Heidrun. "Evolution of photography in maxillofacial surgery: from analog to 3D photography – an overview". Clinical, Cosmetic and Investigational Dentistry Volume 1 (settembre 2009): 39–45. http://dx.doi.org/10.2147/ccide.s6760.

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Palianytsia, Bohdan, Bohdan Kladochnyi e Oksana Palianytsia. "GEODESY, CARTOGRAPHY, AND AERIAL PHOTOGRAPHY". GEODESY, CARTOGRAPHY, AND AERIAL PHOTOGRAPHY 93,2021, n. 93 (23 giugno 2021): 48–58. http://dx.doi.org/10.23939/istcgcap2021.93.048.

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The purpose of this work is to build 3D models of components of zenith tropospheric delay (ZTD) according to the surface measurements of meteorological values obtained at 100 points, which is almost evenly distributed throughout Ukraine. Method. Saastamoinen formulas calculated dry and wet components of the zenith tropospheric delay. According to the obtained results, the fields of dry and wet components of tropospheric delay were compiled, the fields of their change were constructed using a different number of studied points. Also, with the help of a graphic editor, 3D models of the magnitude one-moment distribution of dry and wet components of the zenith tropospheric delay for the territory of Ukraine were built. Results. Built 3D models of ZTD components; constructed zenith tropospheric delay fields for the territory of Ukraine; a comparison of the distribution of delay components for the specified area and its change during the day are the results of this work. It is established that the dry component becomes more important in the southern and central territory of Ukraine, where the observation points are lower in height and where there is a higher atmospheric pressure, which dominates in the calculation of this component. Accordingly, the wet component is also higher in the southern part of Ukraine, but this is due to higher relative humidity. As a result of the compaction of the network to 100 points, more accurate models of component distribution were obtained, which allowed Ukraine to assess in more detail the value of tropospheric delay for the territory of Ukraine. Further compaction of the network for the territory of Ukraine did not lead to the expected increase in the accuracy of tropospheric delay, as the location of meteorological stations in the country is not uniform enough, and some values of meteorological magnitudes are obtained not by direct measurements but by interpolation. It is necessary to compact the model with reliable meteorological measurements evenly and to control the calculation of components by integrating according to the aerological soundings carried out at individual points to obtain a more detailed model. Scientific novelty and practical significance. The scientific novelty is to build 3D models of tropospheric delay components for the territory of Ukraine at a certain point in time. The practical significance of the performed research is that they can be used as an initial step to build a Spatio-temporal model of tropospheric delay, reflecting the spatial changes of the delay in real-time for a particular area.
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Mahvash, Mehran, Roy König, Jörg Wellmer, Horst Urbach, Bernhard Meyer e Karl Schaller. "Coregistration of Digital Photography of the Human Cortex and Cranial Magnetic Resonance Imaging for Visualization of Subdural Electrodes in Epilepsy Surgery". Operative Neurosurgery 61, suppl_5 (1 novembre 2007): ONS340—ONS345. http://dx.doi.org/10.1227/01.neu.0000303992.87987.17.

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Abstract Objective: To develop a method for the coregistration of digital photographs of the human cortex with head magnetic resonance imaging (MRI) scans for invasive diagnostics and resective neocortical epilepsy surgery. Methods: Six chronically epileptic patients (two women, four men; mean age, 34 yr; age range, 20–43 yr) underwent preoperative three-dimensional (3D) T1-weighted MRI scans. Digital photographs of the exposed cortex were taken during implantation of subdural grid electrodes. Rendering software (Analyze 3.1; Biomedical Imaging Resource, Mayo Foundation, Rochester, MN) was used to create an MRI-based 3D model of the brain surface. Digital photographs were manually coregistered with the brain surface MRI model using the registration tool in the Analyze software. By matching the digital photograph and the brain surface model, the position of the subdural electrodes was integrated into the coordinate system of the preoperatively acquired 3D MRI dataset. Results: In all patients, the position of the labeled electrode contacts in relation to the cortical anatomy could be visualized on the 3D models of the cortical surface. At the time of resection, the resulting image of the coregistration process provides a realistic view of the cortex and the position of the subdural electrode. Conclusion: The coregistration of digital photographs of the brain cortex with the results of 3D MRI data sets is possible. This allows for identification of anatomic details underlying the subdural grid electrodes and enhances the orientation of the surgeon.
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Cai, Z., W. Liu, G. Luo e Z. Xiang. "STUDY ON PRACTICAL TECHNOLOGIES OF AERIAL TRIANGULATION FOR REAL SCENE 3D MOELING WITH OBLIQUE PHOTOGRAPHY". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (30 aprile 2018): 119–21. http://dx.doi.org/10.5194/isprs-archives-xlii-3-119-2018.

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The key technologies in the real scene 3D modeling of oblique photography mainly include the data acquisition of oblique photography, layout and surveying of photo control points, oblique camera calibration, aerial triangulation, dense matching of multi-angle image, building of triangulation irregular network (TIN) and TIN simplification and automatic texture mapping, among which aerial triangulation is the core and the results of aerial triangulation directly affect the later model effect and the corresponding data accuracy. Starting from this point of view, this paper aims to study the practical technologies of aerial triangulation for real scene 3D modeling with oblique photography and finally proposes a technical method of aerial triangulation with oblique photography which can be put into practice.
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Han, Jae Wook, Soon Young Cho e Kui Dong Kang. "Correlation between Optic Nerve Parameters Obtained Using 3D Nonmydriatic Retinal Camera and Optical Coherence Tomography: Interobserver Agreement on the Disc Damage Likelihood Scale". Journal of Ophthalmology 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/931738.

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Purpose. To compare stereometric parameters obtained by three-dimensional (3D) optic disc photography and optical coherence tomography (OCT) and assess interobserver agreement on the disc damage likelihood scale (DDLS).Methods. This retrospective study included 190 eyes from 190 patients classified as normal, glaucoma suspect, or glaucomatous. Residents at different levels of training completed the DDLS for each patient before and after attending a training module. 3D optic disc photography and OCT were performed on each eye, and correlations between the DDLS and various parameters obtained by each device were calculated.Results. We found moderate agreement (weighted kappa value, 0.59 ± 0.03) between DDLS scores obtained by 3D optic disc photography and the glaucoma specialist. The weighted kappa values for agreement and interobserver concordance increased among residents after the training module. Interobserver concordance was the poorest at DDLS stages 5 and 6. The DDLS scored by the glaucoma specialist had the highest predictability value (0.941).Conclusions. The DDLS obtained by 3D optic disc photography is a useful diagnostic tool for glaucoma. A supervised teaching program increased trainee interobserver agreement on the DDLS. DDLS stages 5 and 6 showed the poorest interobserver agreement, suggesting that caution is required when recording these stages.
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He, Yuan-Rong, Ping Chen, Wei-Wei Ma e Chih-Cheng Chen. "Construction of 3D Model of Tunnel Based on 3D Laser and Tilt Photography". Sensors and Materials 32, n. 5 (10 maggio 2020): 1743. http://dx.doi.org/10.18494/sam.2020.2692.

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Solyman, Omar, Meleha Ahmad, Karun Arora, AmandaD Henderson e Andrew Carey. "Stereoscopic three-dimensional (3D) slit-lamp photography using a compact 3D digital camera". Indian Journal of Ophthalmology 69, n. 5 (2021): 1303. http://dx.doi.org/10.4103/ijo.ijo_2037_20.

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Thompson, Scott, Graham Thompson, Jessica Sackmann, Julia Spark e Tristan Brown. "Using high-definition aerial photography to search in 3D for malleefowl mounds is a cost-effective alternative to ground searches". Pacific Conservation Biology 21, n. 3 (2015): 208. http://dx.doi.org/10.1071/pc14919.

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The threatened malleefowl (Leipoa ocellata) constructs a large (often >3 m) incubator mound (nest) that is considered a useful proxy for surveying its presence and abundance in the context of an environmental impact assessment. Here we report on the effectiveness and relative cost of using high-definition aerial photography to search in 3D for malleefowl mounds by comparing results to those of earlier ground-based searches. High-definition colour aerial photography was taken of an area of ~7014 ha and searched in 3D for malleefowl mounds. All 24 active (i.e. in use) malleefowl mounds known before the examination of aerial photography were detected using the new assessment technique. Of the 108 total mounds (active and inactive) known from earlier on-ground surveys, 94 (87%) were recorded using the new technique. Mounds not detected were all old and weathered, many barely above ground level and some with vegetation growing in the crater. Approximately 6.3% of the identifications considered ‘confident’ and ~35.0% considered ‘potential’ based on the aerial photography proved to be false positives. The cost of detecting malleefowl mounds using the interpretation of high-definition 3D colour aerial photography and then subsequently examining these areas on the ground is appreciably cheaper than on-ground grid searches.
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Pisetskaya, Olga, Yanina Isayeva e Maksim Goutsaki. "Application of Unmanned Flying Vehicle for Obtaining Digital Orthofotomaps". Baltic Surveying 11 (20 novembre 2019): 60–69. http://dx.doi.org/10.22616/j.balticsurveying.2019.018.

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Nowadays, surveys using unmanned aerial vehicles is becoming popular. The resulting orthophotomap is the final product for creating digital plans and cardboard. The objectives of the study are to study the possibilities of obtaining orthophotomaps from survey materials using unmanned aerial vehicles based on the results of the experiment. The article describes various types of aerial photography. Some types of unmanned flying vehicles to conduct aerial photography for the purpose of monitoring, engineering surveys, inventory of agricultural land, and crop forecasts are considered. A description of aerial photography surveying is given on the example of the city of Dzerzhinsk, Minsk Region, which is performed taking into account the unmanned flying vehicles of GeoScan 201 and the Republican agricultural aero-geodesic unitary enterprise BelPSHAGI. A description of the GeoScan Planner software and basic pre-flight preparation is given. The stages of the preparatory work before the aerial photography, the creation of the planning and high-altitude geodetic justification, the implementation of aerial photography procedures, the steps of the aerial photograph anchorage procedure are considered. Agisoft Photoscan, which allows to get clouds of points, surfaces, 3D models and orthophotomaps using digital raster images are presented. The map of heights (DEM) of the terrain and the orthophotomap was made on the basis of a dense points cloud. According to the results of the research, a conclusion was made on the possibility of using aerial photography materials obtained using unmanned flying vehicles to get orthophotomaps of the required accuracy.
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Jinnin, Masatoshi, Satoshi Fukushima, Shinichi Masuguchi, Hiroki Tanaka, Yoshio Kawashita, Tsuyosh Ishihara e Hironobu Ihn. "Evaluation of usefulness of 3D views for clinical photography". BioScience Trends 5, n. 5 (2011): 211–16. http://dx.doi.org/10.5582/bst.2011.v5.5.211.

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Williams, Susanne K., Lloyd A. Ellis e Gigi Williams. "A 3D Digital Medical Photography System in Paediatric Medicine". Journal of Visual Communication in Medicine 31, n. 3 (gennaio 2008): 91–98. http://dx.doi.org/10.1080/17453050802382839.

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Kawale, Manas, Juhun Lee, Shi Yin Leung, Michelle C. Fingeret, Gregory P. Reece, Melissa A. Crosby, Elisabeth K. Beahm, Mia K. Markey e Fatima A. Merchant. "3D Symmetry Measure Invariant to Subject Pose during Image Acquisition". Breast Cancer: Basic and Clinical Research 5 (gennaio 2011): BCBCR.S7140. http://dx.doi.org/10.4137/bcbcr.s7140.

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In this study we evaluate the influence of subject pose during image acquisition on quantitative analysis of breast morphology. Three (3D) and two-dimensional (2D) images of the torso of 12 female subjects in two different poses; (1) hands-on-hip (HH) and (2) hands-down (HD) were obtained. In order to quantify the effect of pose, we introduce a new measure; the 3D pBRA (Percentage Breast Retraction Assessment) index, and validate its use against the 2D pBRA index. Our data suggests that the 3D pBRA index is linearly correlated with the 2D counterpart for both of the poses, and is independent of the localization of fiducial points within a tolerance limit of 7 mm. The quantitative assessment of 3D asymmetry was found to be invariant of subject pose. This study further corroborates the advantages of 3D stereophotogrammetry over 2D photography. Problems with pose that are inherent in 2D photographs are avoided and fiducial point identification is made easier by being able to panoramically rotate the 3D surface enabling views from any desired angle.
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Zhou, T., L. Lv, J. Liu e J. Wan. "APPLICATION OF UAV OBLIQUE PHOTOGRAPHY IN REAL SCENE 3D MODELING". International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2021 (28 giugno 2021): 413–18. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2021-413-2021.

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Abstract. Aiming at the phenomenon that the traditional measurement methods cannot complete large-scale measurement in a short time, and the image quality obtained by remote sensing in cloudy and rainy areas is difficult to meet the demand, this paper puts forward the idea of using UAV tilt photography to build three-dimensional modeling of urban real scene. The UAV tilt photography technology is used to collect the image data of about 200 km2 in Wuzhishan City. By laying a small number of ground image control points, the aerial triangulation is used to establish the connection, and the three-dimensional modeling of the collected data is carried out. Through the field verification to verify the attribute information of ground objects, the accuracy is verified by using CORS system field coordinate collection. The results show that the ground property and mathematical accuracy of UAV tilt photography model meet the requirements, and can be effectively used in real 3D modeling.
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40

Glaeser, Georg. "Focus Stacking from a Purely Geometrical Point of View". KoG, n. 23 (2019): 18–27. http://dx.doi.org/10.31896/k.23.2.

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In order to create extremely sharp photographs, focus stacking has become a widely used method nowadays, mainly in macro or micro photography. Whereas the aspect of computationally detecting sharp regions of an image has been dealt with in many publications, there is only little published about the geometric background. This paper analyzes the process from a purely geometrical point of view, revealing some non-trivial aspects that may potentially also lead to improvements in a variety of applications such as the 3D scanning of small objects. It is shown that - under calibrated conditions and with certain restrictions - focus stacking of a scene leads to arbitrarily many geometrically correct perspective images of this scene, even including normal projections. The reason for this is that the process of photography never leads to purely two-dimensional images, but collinearly distorted spatial images.
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Thalheimer, Raquel D., Vanessa L. Merker, K. Ina Ly, Amanda Champlain, Jennifer Sawaya, Naomi L. Askenazi, Hamilton P. Herr et al. "Validating Techniques for Measurement of Cutaneous Neurofibromas". Neurology 97, n. 7 Supplement 1 (6 luglio 2021): S32—S41. http://dx.doi.org/10.1212/wnl.0000000000012428.

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ObjectiveTo assess the reliability and variability of digital calipers, 3D photography, and high-frequency ultrasound (HFUS) for measurement of cutaneous neurofibromas (cNF) in patients with neurofibromatosis type 1 (NF1).BackgroundcNF affect virtually all patients with NF1 and are a major source of morbidity. Reliable techniques for measuring cNF are needed to develop therapies for these tumors.MethodsAdults with NF1 were recruited. For each participant, 6 cNF were assessed independently by 3 different examiners at 5 different time points using digital calipers, 3D photography, and HFUS. The intraclass correlation coefficient (ICC) was used to assess intrarater and interrater reliability of linear and volumetric measurements for each technique, with ICC values >0.90 defined as excellent reliability. The coefficient of variation (CV) was used to estimate the minimal detectable difference (MDD) for each technique.ResultsFifty-seven cNF across 10 participants were evaluated. The ICC for image acquisition and measurement was >0.97 within and across examiners for HFUS and 3D photography. ICC for digital calipers was 0.62–0.88. CV varied by measurement tool, linear vs volumetric measurement, and tumor size.ConclusionsHFUS and 3D photography demonstrate excellent reliability whereas digital calipers have good to excellent reliability in measuring cNF. The MDD for each technique was used to create tables of proposed thresholds for investigators to use as guides for clinical trials focused on cNF size. These criteria should be updated as the performance of these end points is evaluated.
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Maiwald, F., F. Henze, J. Bruschke e F. Niebling. "GEO-INFORMATION TECHNOLOGIES FOR A MULTIMODAL ACCESS ON HISTORICAL PHOTOGRAPHS AND MAPS FOR RESEARCH AND COMMUNICATION IN URBAN HISTORY". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W11 (4 maggio 2019): 763–69. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w11-763-2019.

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<p><strong>Abstract.</strong> This contribution shows ongoing interdisciplinary research of the project HistStadt4D, concerning the investigation and development of different multimodal access strategies on large image repositories. The first part of the presented research introduces different methods of access, where classical analogue access stands in contrast to digital access strategies such as online collections, Web3D, Augmented Reality (AR) and Virtual Reality (VR). We discuss the main persisting issues of libraries, advantages of digital methods, and different access tools. The second part shows technologies and workflows used to create various access possibilities. The photogrammetric and geo-informational work serves as a technical basis for a 3D WebGIS as well as multiple AR/VR applications, which require spatial oriented images, object coordinates, and further spatial data. We introduce a research environment that allows art historians spatial access to historical photography, integrating 3D/4D models with photographic documents of the respective architecture. For dissemination of research results in installations and museums, we present fully immersive VR as well as handheld AR applications allowing users a free exploration of historical photography in a spatial setting.</p>
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Pleśniak, Dariusz. "The refractive index of water and glass. Photography vs. 3d graphics". Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Edukacja Plastyczna. Fotografia 12 (2017): 115–32. http://dx.doi.org/10.16926/ep.2017.12.09.

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Sun, Ying Jun, Xin Guo Cui e Zun Yi Xu. "3D Modeling of Submarine Based on Digital Close Range Photogrammetry". Applied Mechanics and Materials 256-259 (dicembre 2012): 2324–27. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.2324.

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A new method to realize 3D measurement and modeling based on Active Control System was put forward in the paper. The Active Control System included two parts: one was for the calibration of digital camera, and the other was for the six-freedom control of digital camera. This method enlarged the intersection angle and improves the intersection precision by multi-baseline photography; enlarges the angle of view by panning photography, and resolves the difficulty of matching for images with large intersection angle. The experiments proved that this method can acquire the high accuracy and improves the production efficiency.
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Bochen, Zhang. "Research on the integration of photographic images and photography art based on 3D virtual reality technology". Concurrency and Computation: Practice and Experience 31, n. 10 (8 ottobre 2018): e4749. http://dx.doi.org/10.1002/cpe.4749.

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Grottoli, Edoardo, Mélanie Biausque, David Rogers, Derek W. T. Jackson e J. Andrew G. Cooper. "Structure-from-Motion-Derived Digital Surface Models from Historical Aerial Photographs: A New 3D Application for Coastal Dune Monitoring". Remote Sensing 13, n. 1 (30 dicembre 2020): 95. http://dx.doi.org/10.3390/rs13010095.

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Recent advances in structure-from-motion (SfM) techniques have proliferated the use of unmanned aerial vehicles (UAVs) in the monitoring of coastal landform changes, particularly when applied in the reconstruction of 3D surface models from historical aerial photographs. Here, we explore a number of depth map filtering and point cloud cleaning methods using the commercial software Agisoft Metashape Pro to determine the optimal methodology to build reliable digital surface models (DSMs). Twelve different aerial photography-derived DSMs are validated and compared against light detection and ranging (LiDAR)- and UAV-derived DSMs of a vegetated coastal dune system that has undergone several decades of coastline retreat. The different studied methods showed an average vertical error (root mean square error, RMSE) of approximately 1 m, with the best method resulting in an error value of 0.93 m. In our case, the best method resulted from the removal of confidence values in the range of 0–3 from the dense point cloud (DPC), with no filter applied to the depth maps. Differences among the methods examined were associated with the reconstruction of the dune slipface. The application of the modern SfM methodology to the analysis of historical aerial (vertical) photography is a novel (and reliable) new approach that can be used to better quantify coastal dune volume changes. DSMs derived from suitable historical aerial photographs, therefore, represent dependable sources of 3D data that can be used to better analyse long-term geomorphic changes in coastal dune areas that have undergone retreat.
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Ruzgienė, Birutė. "A COMPARISON TEST OF FEATURE EXTRACTION FROM AERIAL PHOTOGRAPHY". Geodesy and cartography 30, n. 4 (3 agosto 2012): 112–16. http://dx.doi.org/10.3846/13921541.2004.9636653.

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All features visible in the aerial photographs can be collected by traditional photogrammetric methods; however, such techniques require high operator skills and are very time-consuming. The decision which photogrammetric method uses in mapping is primarily economic, also workload, project deadline requirements and accurate data have to be considered. Up-to-date developed automatic or semi-automatic systems are highly effective for 3D features extraction in urban areas. The investigation objective is the comparison of analytical and digital semi-automatic photogrammetric mapping methods for 3D building models extraction from aerial images analysing in time-consuming and in collected data accuracy consideration.
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Xiao, Yong-Liang, Yongfu Wen, Sikun Li, Qican Zhang e Jianxin Zhong. "Large-scale structured light 3D shape measurement with reverse photography". Optics and Lasers in Engineering 130 (luglio 2020): 106086. http://dx.doi.org/10.1016/j.optlaseng.2020.106086.

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Nam, Giljoo, Joo Ho Lee, Diego Gutierrez e Min H. Kim. "Practical SVBRDF acquisition of 3D objects with unstructured flash photography". ACM Transactions on Graphics 37, n. 6 (10 gennaio 2019): 1–12. http://dx.doi.org/10.1145/3272127.3275017.

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Qiu, Yinguo, Hehe Gu, Jiuyun Sun, Hongtao Duan e Juhua Luo. "Rich-information watermarking scheme for 3D models of oblique photography". Multimedia Tools and Applications 78, n. 22 (17 luglio 2019): 31365–86. http://dx.doi.org/10.1007/s11042-019-07982-7.

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