Relevant bibliographies by topics / High-speed-video photography

Academic literature on the topic 'High-speed-video photography'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "High-speed-video photography"

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KAMEDA, Masaharu, and Koichi NISHINO. "Recent Progress in High-speed Video/Camera Photography." Journal of the Visualization Society of Japan 23, no. 89 (2003): 75. http://dx.doi.org/10.3154/jvs.23.75.

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Khalid, Amir, M. Jaat, Izzuddin Zaman, B. Manshoor, and Mas Fawzi. "Effect of Pilot Injection on Mixture Formation, Ignition Process and Flame Development in Diesel Combustion." Applied Mechanics and Materials 390 (August 2013): 327–32. http://dx.doi.org/10.4028/www.scientific.net/amm.390.327.

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The alternative combustion strategies with systematic control of mixture formation have provided new opportunities and considerable improvement in the combustion process and response to meet the stringent emissions standards. Purpose of this research is to investigate the influences of pilot injection on the fuel-air premixing especially during ignition delay period. During this period, the interaction between fuel spray and surrounding gas prior to ignition which linked to the improvement of mixture formation, ignition process and initial heat recovery thus predominantly influences the combustion process and exhaust emissions. This study investigates the effects of pilot injection using a rapid compression machine together with the schlieren photography and direct photography methods. The detail behavior of mixture formation during ignition delay period was investigated using the schlieren photography system with a high speed digital video camera. This method can capture spray evaporation, spray interference and mixture formation clearly with real images. Ignition process and flame development were investigated by direct photography method using a light sensitive high-speed color digital video camera. Pilot injection promotes mixture formation during ignition delay period and slower oxidation reaction and thus leads to earlier rise and lower peak heat release rate.
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Soyama, Hitoshi. "High-Speed Observation of a Cavitating Jet in Air." Journal of Fluids Engineering 127, no. 6 (July 14, 2005): 1095–101. http://dx.doi.org/10.1115/1.2060737.

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The use of cavitation impact is a practical method for improving the fatigue strength of metals in the same way as shot peening. In the case of peening using cavitation impact, cavitation is produced by a high-speed submerged water jet with cavitation, i.e., a cavitating jet. A cavitating jet in air was successfully generated by injecting a high-speed water jet into a low-speed water jet injected into air using a concentric nozzle. In order to investigate the various appearances of cavitating jets in air, an observation was carried out using high-speed photography and high-speed video recording. In this study, periodical shading of the cavitation cloud was observed and the frequency of the shading was found to be a function of the injection pressure of the low-speed water jet. Unsteadiness of the low-speed water jet, which is related to the periodical shading of the cloud, was also observed.
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Azmi, Azwan I., R. J. T. Lin, and D. Bhattacharyya. "High-Speed Photographic Study of Chip Formation during End Milling of GFRP Composites." Advanced Materials Research 845 (December 2013): 915–19. http://dx.doi.org/10.4028/www.scientific.net/amr.845.915.

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The chip forming process during end milling of glass fibre reinforced composites has been investigated in this study. The qualitative results from a high speed video camera has showed that discontinuous and fracturing of chips has been created due to the heterogeneity and insufficient ductility of the composite materials. The high-speed photography footage has also disclosed that a layer of delaminated chip can be formed as the tool cutting edge fractured the workpiece along the fibre orientation. The fracture of chips into smaller segments accelerated as the cutting speed increases. Likewise, shorter fragment of chips were created as the tool cut at different fibre orientation or angle. This makes it difficult to denote any chip formation processes during the end milling experiments.
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Khalid, Amir, and Bukhari Manshoor. "Effect of High Swirl Velocity on Mixture Formation and Combustion Process of Diesel Spray." Applied Mechanics and Materials 229-231 (November 2012): 695–99. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.695.

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Diesel engines generate undesirable exhaust emissions during combustion process and identified as major source pollution in the worldwide ecosystem. To reduce emissions, the improvements throughout the premixing of fuel and air have been considered especially at early stage of ignition process. Purpose of this study is to clarify the effects of swirl velocity on flow fuel-air premixing mechanism and burning process in diesel combustion that strongly affects the exhaust emissions. The effects of physical factors on mixture formation and combustion process to improve exhaust emissions are discussed in detail. This study investigated diesel combustion fundamentally using a rapid compression machine (RCM) together with the schlieren photography and direct photography methods. RCM was used to simulate actual phenomenon inside the combustion chamber with changing design parameter such as swirl velocity, injection strategies and variable nozzle concept. The detail behavior of mixture formation during ignition delay period was investigated using the schlieren photography system with a high speed digital video camera. This method can capture spray evaporation, spray interference and mixture formation clearly with real images. Ignition process and flame development were investigated by direct photography method using a light sensitive high-speed color digital video camera. Moreover, the mechanism and behavior of mixture formation were analyzed by newly developed image analysis technique. Under high swirl condition, the ignition delay is extended, the higher heat losses and unutilized high-density oxygen associated with slower initial heat recovery begins might be the explanation for the longer combustion duration, reductions of pick heat release and promote combustion and soot oxidation. The real images of mixture formation and flame development reveal that the spray tip penetration is bended by the high swirl motion, fuel is mainly distributed at the center of combustion chamber, resulting that flame is only formed at the center region of the combustion chamber. It is necessary for high swirl condition to improve fuel-air premixing.
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Zhang, Chi, Zhongze Tang, Min Zhang, Bo Wang, and Lei Hou. "Developing a More Reliable Aerial Photography-Based Method for Acquiring Freeway Traffic Data." Remote Sensing 14, no. 9 (May 5, 2022): 2202. http://dx.doi.org/10.3390/rs14092202.

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Due to the widespread use of unmanned aerial vehicles (UAVs) in remote sensing, there are fully developed techniques for extracting vehicle speed and trajectory data from aerial video, using either a traditional method based on optical features or a deep learning method; however, there are few papers that discuss how to solve the issue of video shaking, and existing vehicle data are rarely linked to lane lines. To address the deficiencies in current research, in this study, we formulated a more reliable method for real traffic data acquisition that outperforms the traditional methods in terms of data accuracy and integrity. First, this method implements the scale-invariant feature transform (SIFT) algorithm to detect, describe, and match local features acquired from high-altitude fixed-point aerial photographs. Second, it applies “you only look once” version 5 (YOLOv5) and deep simple online and real-time tracking (DeepSORT) to detect and track moving vehicles. Next, it leverages the developed Python program to acquire data on vehicle speed and distance (to the marked reference line). The results show that this method achieved over 95% accuracy in speed detection and less than 20 cm tolerance in vehicle trajectory mapping. This method also addresses common problems involving the lack of quality aerial photographic data and accuracy in lane line recognition. Finally, this approach can be used to establish a Frenet coordinate system, which can further decipher driving behaviors and road traffic safety.
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Asakura, F., H. Tenjin, K. Matsumoto, S. Ueda, and M. Urano. "Digital Subtraction and Conventional Blood Flow Studies in Porcine Experimental Aneurysms." Interventional Neuroradiology 5, no. 3 (September 1999): 207–12. http://dx.doi.org/10.1177/159101999900500302.

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Flow studies are important to understanding pathogenesis and treatment of cerebral aneurysms, but have not been possible in the clinical setting. We used experimental aneurysms established in and then removed from pigs to compare and correlate flow studies by high-speed video photography of introduced particles and by clinically applicable digital subtraction angiography. Venous pouches were used to create aneurysms in incised common carotid arteries. After aneurysms and parent arteries were removed, specimens were rendered translucent with solvents so they could be studied by video photography of introduced plastic particles in addition to digital subtraction angiography with iodinated contrast material. Regions of interest were studied individually. Mean transit time for contrast in the preparation correlated with videographically measured particle flow velocity (r = 0.616). Digital subtraction angiography should be useful in evaluation of flow in the clinical assessment and treatment of cerebral aneurysms, such as in endovascular therapy.
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Bergfeld, Bastian, Alec van Herwijnen, Benjamin Reuter, Grégoire Bobillier, Jürg Dual, and Jürg Schweizer. "Dynamic crack propagation in weak snowpack layers: insights from high-resolution, high-speed photography." Cryosphere 15, no. 7 (July 30, 2021): 3539–53. http://dx.doi.org/10.5194/tc-15-3539-2021.

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Abstract. Dynamic crack propagation in snow is of key importance for avalanche release. Nevertheless, it has received very little experimental attention. With the introduction of the propagation saw test (PST) in the mid-2000s, a number of studies have used particle tracking analysis of high-speed video recordings of PST experiments to study crack propagation processes in snow. However, due to methodological limitations, these studies have provided limited insight into dynamical processes such as the evolution of crack speed within a PST or the touchdown distance, i.e. the length from the crack tip to the trailing point where the slab comes to rest on the crushed weak layer. To study such dynamical effects, we recorded PST experiments using a portable high-speed camera with a horizontal resolution of 1280 pixels at rates of up to 20 000 frames s−1. We then used digital image correlation (DIC) to derive high-resolution displacement and strain fields in the slab, weak layer and substrate. The high frame rates enabled us to calculate time derivatives to obtain velocity and acceleration fields. We demonstrate the versatility and accuracy of the DIC method by showing measurements from three PST experiments, resulting in slab fracture, crack arrest and full propagation. We also present a methodology to determine relevant characteristics of crack propagation, namely the crack speed (20–30 m s−1), its temporal evolution along the column and touchdown distance (2.7 m) within a PST, and the specific fracture energy of the weak layer (0.3–1.7 J m−2). To estimate the effective elastic modulus of the slab and weak layer as well as the weak layer specific fracture energy, we used a recently proposed mechanical model. A comparison to already-established methods showed good agreement. Furthermore, our methodology provides insight into the three different propagation results found with the PST and reveals intricate dynamics that are otherwise not accessible.
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Maines, B., and R. E. A. Arndt. "The Case of the Singing Vortex." Journal of Fluids Engineering 119, no. 2 (June 1, 1997): 271–76. http://dx.doi.org/10.1115/1.2819130.

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A relatively high amplitude, discrete tone is radiated from fully developed tip vortex cavitation under certain conditions. The phenomenon of the “singing vortex” was first reported by Higuchi et al. (1989). This study more closely examines the singing phenomenon by varying the hydrofoil cross-section, scale, angle of attack, water quality, and cavitation number in two different facilities. Noise data were collected for each condition with visual documentation using both still photography and high speed video in an effort to explain the mechanism of vortex singing. The theory of Kelvin (1880) provides a framework for correlating all the data obtained.
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Srichai, Prathan, Chinda Chareonphonphanich, Preechar Karin, and Nuwong Chollacoop. "Spray Visualization of Biodiesel and Diesel in a High Pressure Chamber." Advanced Materials Research 931-932 (May 2014): 1043–47. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.1043.

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The present research attempted to characterize fuel spray pattern, such as spray angle, spray penetration and their mixture formation by recourse to images analysis. Diesel and biodiesel were used to investigate via a single hole injector (solinoild type) in a constant volume high-pressure chamber. In this experimental study, the spray characteristics of diesel and biodiesel fuel were comparatively evaluated. Initial conditions were ambient temperature, ambient density of 21 kg/m3, injection durations varied from 0.5 and 1 ms and rail pressure of 400 and 800 bar. The series of images were captured by high speed video camera with resolution of 7,500 frames per second and shutter speed of 1/10,000 sec under Schlieren photography technique. The result showed the biodiesel spray penetration was longer than that of the diesel, and spray angle of biodiesel in start injection was larger than biodiesel. From the results, it can be concluded that the higher the density and viscosity of biodiesel, the stronger the effect on the spray mixture formation.
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Dissertations / Theses on the topic "High-speed-video photography"

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Glen, Gregory D. "High-Speed Photography Using Television Techniques." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/611602.

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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada
There are many applications for High-speed photography, and most rely on film as the primary medium of data acquisition. One such application of interest to the military services is the study of stores separation from aircraft. This type of testing has traditionally used high-speed film to gather data, however, there are many disadvantages to using film, such as the high cost of raw film, as well as the high processing expense after it has been exposed. In addition, there is no way to review data from film until it has been processed, nor is there any way to preview in real-time other conditions such as lighting which may affect the outcome of a test event. This paper discusses the characteristics of television systems with respect to motion picture systems, the challenges of recording and transmitting pictures, as well as the nature of what the first and eventual desired systems might be.
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Svensson, Tomas. "Smartphone physics – a smart approach to practical work in science education? : Experiences from a Swedish upper secondary school." Thesis, Stockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-152446.

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In the form of teacher didactical design research, this work addresses a didactical issue encountered during physics teaching in a Swedish upper secondary school. A need for renewed practical laboratory work related to Newtonian mechanics is met by proposing and designing an activity based on high- speed photography using the nowadays omnipresent smartphone, thus bringing new technology into the classroom. The activity – video analysis of the collision physics of football kicks – is designed and evaluated by following a didactical design cycle. The work elaborates on how the proposed laboratory activity relates to the potential and complications of experimental activities in science education, as described in the vast literature on the topic. It is argued that the use of smartphones constitutes an interesting use of new technology for addressing known problems of practical work. Of particular interest is that smartphones offer a way to bridge the gap between the everyday life of students and the world of physics experiments (smartphones are powerful pocket laboratories). The use of smartphones also avoids using unfamiliar laboratory equipment that is known to hinder focus on intended content, while at the same time exploring a powerful tool for data acquisition and analysis. Overall, the use of smartphones (and computers) in this manner can be seen as the result of applying Occam’s razor to didactics: only familiar and readily available instrumentation is used, and skills learned (movie handling and image analysis) are all educationally worthwhile. Although the activity was judged successful, a systematic investigation of learning outcome was out of scope. This means that no strong conclusions can be drawn based on this limited work. Nonetheless, the smartphone activity was well received by the students and should constitute a useful addition to the set of instructional approaches, especially since variation is known to benefit learning. The main failure of the design was an overestimation of student prior knowledge on motion physics (and its application to image data). As a consequence, the activity took required more time and effort than originally anticipated. No severe pitfalls of smartphone usage were identified, but it should be noted that the proposed activity – with its lack of well-defined results due to variations in kick strength – requires that the teacher is capable of efficiently analysing multiple student films (avoiding the feedback process to become overwhelmingly time consuming). If not all student films are evaluated, the feedback to the students may become of low quality, and misconceptions may pass under the radar. On the other hand, given that programming from 2018 will become compulsory, an interesting development of the activity would be to include handling of images and videos using a high-level programming language like Python.
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Books on the topic "High-speed-video photography"

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A, Kyrala George, Snyder Donald R, and Society of Photo-optical Instrumentation Engineers., eds. Ultrahigh- and high-speed photography, videography and photonics '94: 27-28 July 1994, San Diego, California. Bellingham, Wash., USA: SPIE--the International Society for Optical Engineering, 1994.

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Roehrenbeck. Ultrahigh and High Speed Photography Videography and Photonics/V 2002. Society of Photo Optical, 1993.

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Ultrahigh- and high-speed photography, videography, and photonics '93: 13-14 July 1993, San Diego, California. Bellingham, Wash., USA: SPIE, 1993.

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Ultrahigh- and high-speed photography, videography, and photonics '93: 13-14 July 1993, San Diego, California. Bellingham, Wash., USA: SPIE, 1993.

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Ultrahigh- And High-Speed Photography, Videography, and Photonics 95: Proceedings : 10-11 July 1995 San Diego, California. Society of Photo Optical, 1995.

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A, Kyrala George, Snyder Donald R, and Society of Photo-optical Instrumentation Engineers., eds. Ultrahigh- and high-speed photography, videography, and photonics '95: 10-11 July, 1995, San Diego, California. Bellingham, Wash., USA: SPIE, 1995.

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R, Snyder Donald, and Society of Photo-optical Instrumentation Engineers., eds. Ultrahigh- and high-speed photography, photonics and videography: 7-8 August 2003, San Diego, California, USA. Bellingham, Wash., USA: SPIE, 2004.

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Conference papers on the topic "High-speed-video photography"

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Meyer-Ilse, Werner, and Rudolf K. Germer. "High-speed CCD video camera." In 19th Intl Congress on High-Speed Photography and Photonics. SPIE, 1991. http://dx.doi.org/10.1117/12.23997.

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Etoh, Takeharu G., Kohsei Takehara, Tomoo Okinaka, Yasuhide Takano, Arno Ruckelshausen, and Dirk Poggemann. "Development of high-speed video cameras." In 24th International Congress on High-Speed Photography and Photonics, edited by Kazuyoshi Takayama, Tsutomo Saito, Harald Kleine, and Eugene V. Timofeev. SPIE, 2001. http://dx.doi.org/10.1117/12.424295.

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Germer, R. "A High Speed CCD Video Camera." In 18th Intl Congress on High Speed Photography and Photonics, edited by DaHeng Wang. SPIE, 1989. http://dx.doi.org/10.1117/12.969200.

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Stasicki, Boleslaw, G. E. A. Meier, and J. Renschke. "Flash-free high-speed video stroboscope." In 22nd Int'l Congress on High-Speed Photography and Photonics, edited by Dennis L. Paisley and ALan M. Frank. SPIE, 1997. http://dx.doi.org/10.1117/12.273432.

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Liu, Yun, Nuri Zeytinoglu, and Jiliang Li. "Video: High-Speed Schlieren Photography on Falling Objects." In 71th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2018. http://dx.doi.org/10.1103/aps.dfd.2018.gfm.v0028.

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Lozano, Angel, and Yun Liu. "Video: High speed Schlieren photography on match rockets." In 73th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2020. http://dx.doi.org/10.1103/aps.dfd.2020.gfm.v0072.

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Germer, R. "High Speed Video Techniques With Ccd-Cameras." In 17th Int'l Conference on High Speed Photography and Photonics, edited by Donald Hollingworth and Maurice W. McDowell. SPIE, 1987. http://dx.doi.org/10.1117/12.975587.

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Stasicki, Boleslaw, and G. E. A. Meier. "Computer-controlled ultra-high-speed video camera system." In High-Speed Photography and Photonics: 21st International Congress, edited by Ung Kim, Joon-Sung Chang, and Seung-Han Park. SPIE, 1995. http://dx.doi.org/10.1117/12.209602.

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Portz, T., Li Zhang, and Hongrui Jiang. "Random coded sampling for high-speed HDR video." In 2013 IEEE International Conference on Computational Photography (ICCP). IEEE, 2013. http://dx.doi.org/10.1109/iccphot.2013.6528308.

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Speyer, Brian A. "High-speed still video photography for ballistic range applications." In 19th Intl Congress on High-Speed Photography and Photonics, edited by Peter W. W. Fuller. SPIE, 1991. http://dx.doi.org/10.1117/12.24098.

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