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检索条件"任意字段=International Conference on Signal-Image Technology and Internet-Based Systems"

共 6215 条记录，以下是4911-4920 订阅

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image MATCHING ALGORITHMS IN STEREO VISION USING ADDRESS-EVENT-REPRESENTATION: A Theoretical Study and Evaluation of the Different Algorithms

IMAGE MATCHING ALGORITHMS IN STEREO VISION USING ADDRESS-EVE...

引用

international conference on signal Processing and Multimedia Applications

作者： M. Dominguez-Morales E. Cerezuela-Escudero A. Jimenez-Fernandez R. Paz-Vicente J. L. Font-Calvo P. Inigo-Blasco A. Linares-Barranco G. Jimenez-Moreno Department of Architecture and Computer Technology University of Seville

ISBN: (纸本)9789898425720

image processing in digital computer systems usually considers the visual information as a sequence of frames. These frames are from cameras that capture reality for a short period of time. They are renewed and transmitted at a rate of 25-30 fps (typical real-time scenario). Digital video processing has to process each frame in order to obtain a filter result or detect a feature on the input. In stereo vision, existing algorithms use frames from two digital cameras and process them pixel by pixel until it is found a pattern match in a section of both stereo frames. Spike-based processing is a relatively new approach that implements the processing by manipulating spikes one by one at the time they are transmitted, like a human brain. The mammal nervous system is able to solve much more complex problems, such as visual recognition by manipulating neuron's spikes. The spike-based philosophy for visual information processing based on the neuro-inspired Address-Event-Representation (AER) is achieving nowadays very high performances. In this work we study the existing digital stereo matching algorithms and how do they work. After that, we propose an AER stereo matching algorithm using some of the principles shown in digital stereo methods.

关键词： Stereo vision Epipolar restriction image matching Address-event-representation Spike Retina Area-based method Features-based method

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A color image encryption algorithm based generalized chaos synchronization for bidirectional discrete systems for audio signal communication

A color image encryption algorithm based generalized chaos s...

引用

2010 international conference on Intelligent Control and Information Processing, ICICIP 2010

作者： Yin, Ping Min, Lequan Information Engineering School University of Science and Technology Beijing Beijing 100083 China Applied Science School University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)9781424470488

based on generalized chaos synchronization theorems for bidirectional discrete system, we construct a Henon area-preserving quadratic system, and design a new 3-dimensional chaotic system called generalized discrete predator-prey system. Furthermore, a new encryption algorithm based on composite two new discrete chaotic systems for sound communication is proposed. This encryption algorithm has 9 keys, and the secure key space is larger than 2 225. At first, the algorithm uses the key stream generated by discrete chaotic systems to mask secrete image. Second, it uses the least significant bit (LSB) embeddinf method to embed the masked message into audio signals. Our method can be used for steganography in the internet audio signal communications. The analysis of the key space, sensitivity of key parameters, and correlation of encrypted signals imply that our encryption algorithm has good security. © 2010 IEEE.

关键词： Chaotic systems

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A region-based progressive coding of Semi-Regular 3-D meshes for view-dependent transmission

A region-based progressive coding of Semi-Regular 3-D meshes...

引用

international conference on signal image technology and internet based systems

作者： Roudet, Céline Université de Bourgogne LE2I Dijon F-21078 France

ISBN: (纸本)9780769543192

We first introduce in this paper a new waveletbased segmentation algorithm for three-dimensional (3-D) Semi-Regular (SR) meshes. This method is then considered as a pre-processing step in a view-dependent progressive coding of 3-D meshes. Our segmentation process aims at producing homogeneous regions which have similar frequency amplitudes on the mesh surface, in other words: patches with different degrees of roughness. As a preliminary step of the development of a locally-based Rate-Distortion (R-D) optimized coding scheme, we propose to study the behaviour of the wavelet decomposition in the created patches, during the coding and the view-dependent reconstruction processes. To our knowledge, no previous work has ever considered the influence of the nonrefined parts of a mesh on the more detailed ones, in a viewdependent context. The main contribution of this paper consists in considering three different possible wavelet decompositions, close to the patch borders, and to study their influence during the coding and the view-dependent reconstruction stages. Among these three decompositions, we define a new scheme and finally propose various experimentations to demonstrate that it behaves better than the other classical considerations, for view-dependent reconstruction purposes. © 2010 IEEE.

关键词： Multiresolution analysis

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Test pattern based evaluation of ringing and blur in JPEG and JPEG2000 compressed images

Test pattern based evaluation of ringing and blur in JPEG an...

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4th international conference on signal Processing and Communication systems (ICSPCS)/12th international Symposium on DSP and Communication systems (DSPCS)/9th Workshop on the internet, Telecommunications and signal Processing (WTSP)

作者： Punchihewa, Amal Keerl, Alexander Massey Univ Turitea Sch Engn & Adv Technol Palmerston North 4410 New Zealand Univ Appl Sci & Arts Dept Nat Sci & Technol D-37085 Gottingen Germany

ISBN: (纸本)9781424479078

In this paper we present main parameters of the ringing artefact and demonstrate their influence on image fidelity of lossy compressed images. We apply variations of these parameters to create a specific set of test images to highlight the ringing artefact and to be able to evaluate the behaviour of ringing along edges. Therefore we introduce a new ringing metric, that analyzes image profiles of compressed images in terms of global luminance shift, blur and ringing.

关键词： Ringing Edge Blur Compression Artefact JPEG JPEG2000

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MULTIMEDIA FORENSIC HASH based ON VISUAL WORDS

MULTIMEDIA FORENSIC HASH BASED ON VISUAL WORDS

引用

IEEE international conference on image Processing

作者： Lu, Wenjun Wu, Min Univ Maryland Dept Elect & Comp Engn College Pk MD 20742 USA

ISBN: (纸本)9781424479948

In recent years, digital images and videos have become increasingly popular over the internet and bring great social impact to a wide audience. In the meanwhile, technology advancement allows people to easily alter the content of digital multimedia and brings serious concern on the trustworthiness of online multimedia information. Forensic hash is a short signature attached to an image before transmission and acts as side information for analyzing the processing history and trustworthiness of the received image. In this paper, we propose a new construction of forensic hash based on visual words representation. We encode SIFT features into a compact visual words representation for robust estimation of geometric transformations and propose a hybrid construction using both SIFT and block-based features to detect and localize image tampering. The proposed hash construction achieves more robust and accurate forensic analysis than prior work.

关键词： Multimedia forensics forensic hash visual words SIFT

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image hiding and extraction algorithm based on intensity quantization and block random scrambling

Image hiding and extraction algorithm based on intensity qua...

引用

international conference on signal Processing systems, ICSPS

作者： Lin, Junhuan Chen, Yuefen Mechanical and Electrical Engineering Department Taizhou Vocational Technical College Taizhou China School of Physics and Electronic Engineering Taizhou University Taizhou China

ISBN: (纸本)9781424468911

Information hiding technology is studied in this paper, and a new image hiding algorithm based on intensity quantization and block random scrambling is proposed in this paper. The information is embedded into the carrier image in space domain, and when reconstructing the secret information, noise detection is performed before inverse quantization. A simple system of image hiding and extraction using the proposed algorithm based on Matlab is realized, and its resistance to noising, cropping and scribbling is simulated Results verifies the validity of the proposed algorithm and it has the advantages of simple implementation, large hiding capacity and good anti-noising and cropping performance. © 2010 IEEE.

关键词： image compression

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VIDEO SURVEILLANCE AT AN INDUSTRIAL ENVIRONMENT USING AN ADDRESS EVENT VISION SENSOR: Comparative between Two Different Video Sensor based on a Bioinspired Retina

VIDEO SURVEILLANCE AT AN INDUSTRIAL ENVIRONMENT USING AN ADD...

引用

international conference on signal Processing and Multimedia Applications

作者： Fernando Perez-Pena Arturo Morgado-Estevez Rafael J. Montero-Gonzalez Alejandro Linares-Barranco Gabriel Jimenez-Moreno Applied Robotics Research Lab University of Cadiz Robotic and Technology of Computers Lab University of Seville

ISBN: (纸本)9789898425720

Nowadays we live in very industrialization world that turns worried about surveillance and with lots of occupational hazards. The aim of this paper is to supply a surveillance video system to use at ultra fast industrial environments. We present an exhaustive timing analysis and comparative between two different Address Event Representation (AER) retinas, one with 64×64 pixel and the other one with 128×128 pixel in order to know the limits of them. Both are spike based image sensors that mimic the human retina and designed and manufactured by Delbruck's lab. Two different scenarios are presented in order to achieve the maximum frequency of light changes for a pixel sensor and the maximum frequency of requested pixel addresses on the AER output. Results obtained are 100 Hz and 1.88 MHz at each case for the 64×64 retina and peaks of 1.3 KHz and 8.33 MHz for the 128×128 retina. We have tested the upper spin limit of an ultra fast industrial machine and found it to be approximately 6000 rpm for the first retina and no limit achieve at top rpm for the second retina. It has been tested that in cases with high light contrast no AER data is lost.

关键词： Bio-inspired Video Industrial Surveillance Spike Retinomorphic systems Address Event Representation

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A Thin-Plate Spline based multimodal prostate registration with optimal correspondences

A Thin-Plate Spline based multimodal prostate registration w...

引用

international conference on signal image technology and internet based systems

作者： Mitra, Jhimli Oliver, Arnau Martí, Robert Lladó, Xavier Vilanova, Joan C. Meriaudeau, Fabrice Laboratoire Le2I UMR CNRS 5158 Université de Bourgogne 12 Rue de la Fonderie 71200 Le Creusot France Computer Vision and Robotics Group University of Girona Campus Montilivi Av. Lluís Santaló s/n 17071 Girona Spain Clinica Girona Calle Joan Maragall 26 17002 Girona Spain

ISBN: (纸本)9780769543192

Accurate extraction of prostate biopsy samples during Transectal Ultra Sound (TRUS) guided prostate biopsy is facilitated with the registration of pre-acquired Magnetic Resonance (MR) images with the Ultrasound (US) images. This paper proposes a novel method of generating optimal correspondences to register the MR and US images using Thin-Plate Splines (TPS) transformation. The correspondence generation method exploits the prostate shape geometry in both the modalities and is fully automatic. Normalized Mutual Information (NMI) is employed for the quantitative determination of optimal number of correspondences in terms of maximization of registration similarity. Qualitative registration results, that conform to the NMI measures are also shown for different numbers of correspondences. Shepard's interpolation method is used with the TPS in order to deal with the interpolation error of backward TPS transformation. The accuracy of our method of correspondence generation is qualitatively evaluated in comparison with two intuitive geometric contour sampling methods. An average Dice Similarity Coefficient (DSC) value of 0.97 ± 0.01 for 4 patient datasets is obtained for the TPS registration using our novel method of correspondences. © 2010 IEEE.

关键词： Magnetic resonance

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image Fusion based on regional energy and standard deviation

Image Fusion based on regional energy and standard deviation

引用

international conference on signal Processing systems, ICSPS

作者： Xing, Su-Xia Chen, Tian-Hua Li, Jing-Xian School of Computer and Information Engineering Beijing Technology and Business University Beijing 100048 China

ISBN: (纸本)9781424468911

image fusion technology of infrared and visible light could enhance the driver's visual effects in low visibility circumstance, and reduce the probability of the traffic accidents. Focused on the application of wavelet transform in image fusion, a image fusion method was proposed based on a regional energy and standard deviation for the infrared and visual light images. In this method, low-frequency approximation component of wavelet transform were obtained by a regional energy-weighted fusion rule, and three high-frequency details components were composed by utilizing the regional standard deviation-weighted fusion rule. Through the two groups of infrared and visual light image fusion experiments show that: the standard deviation of the image produced by the method increased 41.8% and 67.2% and the average brightness increased from 34.6% to 55.1% compared with simple method, respectively. © 2010 IEEE.

关键词： Wavelet transforms

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An Information hiding algorithm based on RDWT for fingerprint biometric system

An Information hiding algorithm based on RDWT for fingerprin...

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international conference on signal Processing systems, ICSPS

作者： Yan, Jia-Ming Liu, Liyuan School of Electronics and Information Northwestern Polytechnical University Xi'an China

ISBN: (纸本)9781424468911

Digital watermarking based on biometric identification is a novel Information hiding technology. The paper presents a 3-level RDWT biometric watermarking algorithm to embed fingerprints minutiae data in a color face image of the same individual for increased information hiding robustness, security and accuracy. The hidden minutiae data can be extracted accurately from the carrier image using a secret key. Result shows that the proposed RDWT watermarking algorithm is robust to different attacks, and can provide the multimodal biometric verification accuracy of 94%. © 2010 IEEE.

关键词： Biometrics

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