Dissertations / Theses on the topic 'Re-identification and image enhancement'
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Abdelkarim, Ahmad Ali. "Effect of JPEG2000 compression on landmark identification of lateral cephalometric digital radiographs a thesis /." San Antonio : UTHSC, 2008. http://learningobjects.library.uthscsa.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=57&CISOBOX=1&REC=16.
Full textTuresson, Eric. "Multi-camera Computer Vision for Object Tracking: A comparative study." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21810.
Full textSenses, Engin Utku. "Blur Estimation And Superresolution From Multiple Registered Images." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609929/index.pdf.
Full textDimitrov, Emanuil. "Fingerprints recognition." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-5522.
Full textNowadays biometric identification is used in a variety of applications-administration, business and even home. Although there are a lot of biometric identifiers, fingerprints are the most widely spread due to their acceptance from the people and the cheap price of the hardware equipment. Fingerprint recognition is a complex image recognition problem and includes algorithms and procedures for image enhancement and binarization, extracting and matching features and sometimes classification. In this work the main approaches in the research area are discussed, demonstrated and tested in a sample application. The demonstration software application is developed by using Verifinger SDK and Microsoft Visual Studio platform. The fingerprint sensor for testing the application is AuthenTec AES2501.
Kaufman, Jason R. "Spatial-Spectral Feature Extraction on Pansharpened Hyperspectral Imagery." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1408706595.
Full textYe, Mang. "Open-world person re-identification." HKBU Institutional Repository, 2019. https://repository.hkbu.edu.hk/etd_oa/688.
Full textBoudjenouia, Fouad. "Restauration d’images avec critères orientés qualité." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2031/document.
Full textThis thesis concerns the blind restoration of images (formulated as an ill-posed and illconditioned inverse problem), considering a SIMO system. Thus, a blind system identification technique in which the order of the channel is unknown (overestimated) is introduced. Firstly, a simplified version at reduced cost SCR of the cross relation (CR) method is introduced. Secondly, a robust version R-SCR based on the search for a sparse solution minimizing the CR cost function is proposed. Image restoration is then achieved by a new approach (inspired from 1D signal decoding techniques and extended here to the case of 2D images) based on an efficient tree search (Stack algorithm). Several improvements to the ‘Stack’ method have been introduced in order to reduce its complexity and to improve the restoration quality when the images are noisy. This is done using a regularization technique and an all-at-once optimization approach based on the gradient descent which refines the estimated image and improves the algorithm’s convergence towards the optimal solution. Then, image quality measurements are used as cost functions (integrated in the global criterion), in order to study their potential for improving restoration performance. In the context where the image of interest is corrupted by other interfering images, its restoration requires the use of blind sources separation techniques. In this sense, a comparative study of some separation techniques based on the property of second-order decorrelation and sparsity is performed
Franco, Alexandre da Costa e. Silva. "On deeply learning features for automatic person image re-identification." Escola Politécnica / Instituto de Matemática, 2016. http://repositorio.ufba.br/ri/handle/ri/21639.
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The automatic person re-identification (re-id) problem resides in matching an unknown person image to a database of previously labeled images of people. Among several issues to cope with this research field, person re-id has to deal with person appearance and environment variations. As such, discriminative features to represent a person identity must be robust regardless those variations. Comparison among two image features is commonly accomplished by distance metrics. Although features and distance metrics can be handcrafted or trainable, the latter type has demonstrated more potential to breakthroughs in achieving state-of-the-art performance over public data sets. A recent paradigm that allows to work with trainable features is deep learning, which aims at learning features directly from raw image data. Although deep learning has recently achieved significant improvements in person re-identification, found on some few recent works, there is still room for learning strategies, which can be exploited to increase the current state-of-the-art performance. In this work a novel deep learning strategy is proposed, called here as coarse-to-fine learning (CFL), as well as a novel type of feature, called convolutional covariance features (CCF), for person re-identification. CFL is based on the human learning process. The core of CFL is a framework conceived to perform a cascade network training, learning person image features from generic-to-specific concepts about a person. Each network is comprised of a convolutional neural network (CNN) and a deep belief network denoising autoenconder (DBN-DAE). The CNN is responsible to learn local features, while the DBN-DAE learns global features, robust to illumination changing, certain image deformations, horizontal mirroring and image blurring. After extracting the convolutional features via CFL, those ones are then wrapped in covariance matrices, composing the CCF. CCF and flat features were combined to improve the performance of person re-identification in comparison with component features. The performance of the proposed framework was assessed comparatively against 18 state-of-the-art methods by using public data sets (VIPeR, i-LIDS, CUHK01 and CUHK03), cumulative matching characteristic curves and top ranking references. After a thorough analysis, our proposed framework demonstrated a superior performance.
Wang, Xiangwen. "Photo-based Vendor Re-identification on Darknet Marketplaces using Deep Neural Networks." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83447.
Full textMaster of Science
Taking advantage of the high anonymity of darknet, cybercriminals have set up underground trading websites such as darknet markets for trading illegal goods. To understand the relationships between cybercriminals and identify coordinated activities, it is necessary to identify the multiple accounts hold by the same vendor. Apart from manual investigation, previous studies have proposed methods for linking multiple accounts through analyzing the writing styles hidden in the users' online posts, which face key challenges in similar tasks on darknet markets. In this thesis, we propose a novel approach to link multiple identities within the same darknet market or across different markets by analyzing the product photos. We develop a system where a series of deep neural networks (DNNs) are used with transfer learning to extract distinct features from a vendor's photos automatically. Using real-world datasets from darknet markets, we evaluate the proposed system which shows clear advantages over the writing style based system. Further analysis of the results reported by the proposed system reveal new insights into coordinated activities such as price manipulation, buyer scam and product stocking and reselling for those vendors who hold multiple accounts.
Ibn, Khedher Mohamed. "Ré-identification de personnes à partir des séquences vidéo." Thesis, Evry, Institut national des télécommunications, 2014. http://www.theses.fr/2014TELE0018/document.
Full textThis thesis focuses on the problem of hu man re-identification through a network of cameras with non overlapping fields of view. Human re-identification is defined as the task of determining if a persan leaving the field of one camera reappears in another. It is particularly difficult because of persons' significant appearance change within different cameras vision fields due to various factors. In this work, we propose to exploit the complementarity of the person's appearance and style of movement that leads to a description that is more robust with respect to various complexity factors. This is a new approach for the re-identification problem that is usually treated by appearance methods only. The major contributions proposed in this work include: person's description and features matching. First we study the re-identification problem and classify it into two scenarios: simple and complex. In the simple scenario, we study the feasibility of two approaches: a biometric approach based on gait and an appearance approach based on spatial Interest Points (IPs) and color features. In the complex scenario, we propose to exploit a fusion strategy of two complementary features provided by appearance and motion descriptions. We describe motion using spatiotemporal IPs, and use the spatial IPs for describing the appearance. For feature matching, we use sparse representation as a local matching method between IPs. The fusion strategy is based on the weighted sum of matched IPs votes and then applying the rule of majority vote. Moreover, we have carried out an error analysis to identify the sources of errors in our proposed system to identify the most promising areas for improvement
Souded, Malik. "Détection, suivi et ré-identification de personnes à travers un réseau de caméra vidéo." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00913072.
Full textCheng, Yuan-Chiao, and 鄭元僑. "Enhancement and Application of Image Signal Identification in Vehicle-to-vehicle Visible Light Communication." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/qb4v89.
Full text國立臺灣大學
光電工程學研究所
105
Artificial Intelligence (A.I.) and technologies of machine learning had made significant success in recent years. Many of things that are known as “human-operating-only” can be done well by A.I. Although self-driving cars are not widespread now, it’s can be anticipated that self-driving will become more popular as the technology is improved in the future. Vehicle-to-vehicle (V2V) communication is one of the important parts of self-driving. The positions and velocities of nearby cars can be detected by V2V communication, and the information can be further used to prevent collisions. Visible light communication (VLC) has high potential in this field. One of the reasons is that most of cars are using light-emitting-diodes (LEDs) for illumination and LEDs are easily modulated and have high efficiency, which is a perfect transmitter for VLC. The other reason is that visible light can be blocked easily and has high directivity. So that only nearby signals generated in proper orientations are detected, which is an important benefit in V2V communication. In this thesis, an Arduino board was used to modulate arrays of LEDs, and use smart phone camera as the receiver to build a VLC system. This device is used to simulate the actual situation of VLC between the tail-light of a car and a dash cam. In this thesis, rolling-shutter effect and image processing are used to identify difference between normal light source and the modulated tail-light of car. After this, boundary detection is used to decode message and estimate the distance between cars. For image processing, adaptive the histogram equalization and the two-dimensional convolution are used to strengthen the ability of the system to identifying modulated tail-light. On-off keying is used for modulation, and run-length limited (RLL) coding prevents too many continuous zeros affecting illumination and decoding signal. In the end, limited by the frame rate of camera, this device can only send 16 bits per second, which is designed to transmit velocity information of car.
Ουζούνογλου, Αναστασία. "Αυτόματη ταυτοποίηση βιομετρικών χαρακτηριστικών : εφαρμογή στα δακτυλικά αποτυπώματα." Thesis, 2011. http://hdl.handle.net/10889/5449.
Full textAutomatic Fingerprint Identification is a difficult and multidimensional problem. For this reason, the number of papers and techniques regarding this issue is numerous. The hardness of the problem lies with the fact that there is a large percentage of corrupted and partial fingerprint images. Throughout this Thesis, two methods were proposed for the Automatic Fingerprint Identification: a) the Automatic Fingerprint Identification based on registration techniques and b) the Automatic Fingerprint Identification based on the theory of Self Organizing Maps of Kohonen, setting the minutiae of the fingerprint images as input neurons of the Map. Furthermore, an important step prior to the application of the proposed automatic fingerprint identification methods is the pre-processing of these images by the development and implementation of a series of image processing techniques in order to enhance the image quality and to extract the minutiae which are then used for the fingerprint identification. In this Thesis, a substantial number of fingerprint images were used from the database VeriFingerSample_DB kai from the database DB3 of the competition FVC2004. The quantitative evaluation of both proposed automatic fingerprint identification methods were based on the Equal Error Rate (EER) criterion. According to this, the Automatic Fingerprint Identification based on the Self Organizing Maps outperformed against any other method based on registration techniques.
Wu, Meng-Zu, and 吳孟澤. "Body Part Multi-task Dense Network for Image-based Person Re-identification." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/e2924q.
Full text輔仁大學
電機工程學系碩士班
107
Neural network methods of person re-identification are mostly based on the inception structure, which leads to the huge amount of model parameters and the problem of gradient vanishing. DenseNet solves the problem of gradient vanishing by proposing dense block, but dense block has a high demand for GPU memory, making it difficult to use. For the multi-task neural network methods, research on feature fusion is lack of experiments and detailed discussion. The pyramid depth parameters proposed in this paper can reduce the GPU memory required for the dense block-based network model and maintain the accuracy of the model. This paper also proposes the parameter efficiency type dense block that further reduces the number of parameters. Because of these two designs, the dense block can be used for complex network structures. This paper collects a variety of fusion units, proposes three fusion structures. We find the most effective feature fusion subnet by analyzing the feature fusion subnets composed of different fusion units and fusion structures. Through the above improvement, this paper implemented a neural network method of person re-identification based on body parts-BPMDN. The feature extraction subnet of BPMDN can be implemented because of pyramid depth parameters and parameter efficiency type dense block. BPMDN saves about half the amount of parameters and has higher accuracy than inception-based methods, and shows excellent generalization ability compared with state-of-the-art.
Tai, Yu-Hung, and 戴佑宏. "The effect of team image, team identification and loyalty on team re-support intension." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/94039807594462362341.
Full text國立臺灣師範大學
體育學系
101
The purpose of this study was to reveal the relations among team image, team identification, loyalty and team re-support intension in fans of EDA Rhinos. Five hundred questionnaires were sent during March 18 to 27, 2013. Descriptive statistics, multiple stepwise regression and logistic regression were used for data analysis. The results were stated as follows: 1. The main group of fans in EDA Rhinos was college graduated student less than 28 years old, TV as their view massage, and their monthly salary are below NT 10,000 dollars. 2. The point of team image, team identification and loyalty were brightly higher than average in this study. 3. Team identification and loyalty could be well predicted by team image. 4. Team identification was the best predictor for loyalty. 5. Team image and loyalty affect re-support intension positively, and team image and loyalty are main predictors. According to the results, EDA Rhinos should strengthen the characteristic management of home court, as the emotion connection would positively affect team image and loyalty, there will be a beneficial impact on whole management.
Cruz, Cheri Ann. "Satellite image enhancements, lineament identification and quantitative comparison with fracture data, central New York State." 2005. http://proquest.umi.com/pqdweb?did=974425831&sid=5&Fmt=2&clientId=39334&RQT=309&VName=PQD.
Full textTitle from PDF title page (viewed on Apr. 13, 2006) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Jacobi, Robert D. Includes bibliographical references.