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检索条件"任意字段=Conference on Applications of Digital Image Processing XX"

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Efficient coding of depth map by exploiting temporal correlation

Efficient coding of depth map by exploiting temporal correla...

引用

2014 International conference on digital image Computing: Techniques and applications, DICTA 2014

作者： Shahriyar, Shampa Murshed, Manzur Ali, Mortuza Paul, Manoranjan Faculty of Information Technology Monash University Australia School of Engineering and Information Technology Federation University Australia Australia School of Computing and Mathematics Charles Sturt University Australia

ISBN: (纸本)9781479954094

With the growing demands for 3D and multi-view video content, efficient depth data coding becomes a vital issue in image and video coding area. In this paper, we propose a simple depth coding scheme using multiple prediction modes exploiting temporal correlation of depth map. Current depth coding techniques mostly depend on intra-coding mode that cannot get the advantage of temporal redundancy in the depth maps and higher spatial redundancy in inter-predicted depth residuals. Depth maps are characterized by smooth regions with sharp edges that play an important role in the view synthesis process. As depth maps are more sensitive to coding errors, use of transformation or approximation of edges by explicit edge modelling has impact on view synthesis quality. Moreover, lossy compression of depth map brings additional geometrical distortion to synthetic view. In this paper, we have demonstrated that encoding inter-coded depth block residuals with quantization at pixel domain is more efficient than the intra-coding techniques relying on explicit edge preservation. On standard 3D video sequences, the proposed depth coding has achieved superior image quality of synthesized views against the new 3D-HEVC standard for depth map bit-rate 0.25 bpp or higher. © 2014 IEEE.

关键词： Video signal processing

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An overview of research in 3DTV

An overview of research in 3DTV

引用

Joint Meeting of the 14th International Workshop on Systems, Signals and image processing/EURASIP conference Focused on Speech and image processing, Multimedia Communications and Services

作者： Onural, Levent Bilkent Univ Dept Elect Engn TR-06800 Ankara Turkey

ISBN: (纸本)9789612480363

3DTV is regarded by the experts and the general public as the next major step in video technologies. The ghost-like images of remote persons or objects are already depicted in many futuristic movies;both entertainment applications, as well as 3D video telephony, are among the commonly imagined utilizations of such a technology. As in every product, there are various different technological approaches also in 3DTV. By the way, 3D technologies are not new;the earliest 3DTV application is demon-strated within a few years after the invention of 2D TV. However, earlier 3D video relied on stereoscopy. Current work mostly focuses on advanced variants of stereoscopic principles like goggle-free autostereoscopic multi-view devices. However, holographic 3DTV and its variants are the ultimate goal and will yield the envisioned high-quality ghost-like replicas of original scenes once technological problems are solved. Stereoscopy is based on exploiting the human perception. Simply, two views, taken at two slightly different angles are then guided to left and right eyes. The two eyes, receiving the two different views of the same scene from two different angles, provide the visual signals to the brain;and then, the brain interprets the scene as 3D. However, there are many different 3D depth cues in perception, and usually, there are contradictory signals received by the brain. Viewers experience a motion-sickness-like feeling as a consequence of such mismatches. This is the major reason which kept 3D from becoming a popular mode of visual communications. However, recent advances in end-to-end digital techniques minimized such problems. Stereoscopic TV broadcasts have been conducted. Novel advances in stereoscopy brought viewing without goggles;however, the viewer and the monitor must have a fixed location and orientation with respect to each other for most autostereoscopic images. Multi-view autostereoscopic displays allow some horizontal parallax within a limited viewing angle.

关键词： Stereo image processing

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digital signal processing, theory/practice, HW/SW

Digital signal processing, theory/practice, HW/SW

引用

2009 ASEE Annual conference and Exposition

作者： Pan, Wei Mousavinezhad, S. Hossein Hart, Kenyon VLSI Laboratory Electrical Engineering Department Idaho State University United States Idaho State University United States Electrical Engineering Department Idaho State University Pocatello Idaho United States

digital Signal processing (DSP) is a course offered by many Electrical and Computer Engineering (ECE) programs. In our school we offer a senior-level, first-year graduate course with both lecture and laboratory sections. Our experience has shown that some students consider the subject matter to be too theoretical, relying heavily on mathematical concepts and abstraction. There are several visible applications of DSP including: cellular communication systems, digital image processing and biomedical signal processing. Authors have incorporated many examples utilizing software packages including MATLAB/MATHCAD in the course and also used classroom demonstrations to help students visualize some difficult (but important) concepts such as digital filters and their design, various signal transformations, convolution, difference equations modeling, signals/systems classifications and power spectral estimation as well as optimal filters. In our institution the laboratory section was offered mainly as a software (SW) environment (mostly working with matlab/simulink.) However since Spring 2008 semester, a hardware (HW) component has been added to the laboratory where students work with Texas Instruments TMS 3206713 DSP boards in addition to using software packages in implementing some of the DSP algorithms in both hardware and software. In addition, the software programming environment of LabVIEW is being considered as another tool to be utilized in the laboratory section. Our introductory classes introduce students to software tools and this advanced sequence of lecture/laboratory sections allows students to apply their knowledge of available tools to an important application area within the electrical/computer engineering discipline. One of the authors has extensive industrial background and has used up-to-date tools in microelectronics and related application areas;another author has several years of experience teaching DSP at different schools. © American Society for Engin

关键词： digital signal processing

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Noise resistant contrast enhancement

Noise resistant contrast enhancement

引用

Eighth IASTED International conference on Computer Graphics and Imaging, CGIM 2005

作者： Kim, Yeong-Taeg DMS Lab. Samsung Information Systems America 3345 Michelson Dr. #250 Irvine CA United States

ISBN: (纸本)0889865140

One of the problems of a contrast enhancement in practice is the noise boost-up, which limits the applications of the contrast enhancement in consumer products such as digital TV. To resolve this issue, a novel approach for contrast enhancement is presented, which effectively prevents the visual amplification of a noise while the contrast is being enhanced. The proposed algorithm borrows the notion behind the Weber's Law. Compared to typical approach which incorporates noise reduction algorithm before applying contrast enhancement, the proposed algorithm is free from possible blurring in the enhanced results.

关键词： image enhancement

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image processor capable of block-noise-free JPEG2000 compression with 30frames/s for digital camera applications

Image processor capable of block-noise-free JPEG2000 compres...

引用

2003 Digest of Technical Papers

作者： Yamauchi, Hideki Okada, Shigeyuki Taketa, Kazuhiko Ohyama, Tatsushi Matsuda, Yuh Mori, Tsugio Okada, Shin'ichiro Watanabe, Tsuyoshi Matsuo, Yoshihiro Yamada, Yuji Ichikawa, Tatsuya Matsushita, Yoshifumi Sanyo Electric Gifu Japan

A one-chip image processor for next-generation digital cameras and broadband PDA multimedia mobile phones is described. It is capable of processing JPEG2000 data with 30frames/s and a 27MHz operating frequency. The pr... 详细信息

关键词： image compression

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Infrared imagery acquisition process supporting simulation and real image training

Infrared imagery acquisition process supporting simulation a...

引用

conference on Modeling and Simulation for Defense Systems and applications VII

作者： O'Connor, John USA Night Vis & Elect Sensors Directorate Modeling & Simulat Div Recognit Combatant Project NVM MM ROC Ft Belvoir VA 22060 USA

ISBN: (纸本)9780819490810

The increasing use of infrared sensors requires development of advanced infrared training and simulation tools to meet current Warfighter needs. In order to prepare the force, a challenge exists for training and simulation images to be both realistic and consistent with each other to be effective and avoid negative training. The US Army Night Vision and Electronic Sensors Directorate has corrected this deficiency by developing and implementing infrared image collection methods that meet the needs of both real image trainers and real-time simulations. The author presents innovative methods for collection of high-fidelity digital infrared images and the associated equipment and environmental standards. The collected images are the foundation for US Army, and USMC Recognition of Combat Vehicles (ROC-V) real image combat ID training and also support simulations including the Night Vision image Generator and Synthetic Environment Core. The characteristics, consistency, and quality of these images have contributed to the success of these and other programs. To date, this method has been employed to generate signature sets for over 350 vehicles. The needs of future physics-based simulations will also be met by this data. NVESD's ROC-V image database will support the development of training and simulation capabilities as Warfighter needs evolve.

关键词： Sensors Infrared imaging Infrared radiation Mid-IR Long wavelength infrared image processing image sensors Cameras Computer simulations Night vision

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Classification of image Steganography in Substitution Technique 1st

Classification of Image Steganography in Substitution Techni...

引用

1st FICR International conference on Rising Threats in Expert applications and Solutions, FICR-TEAS 2020

作者： Vaidya, Krishna Kargathara, Afsana Kumbharana, C.K. Saurashtra University RajkotGujarat India

ISBN: (纸本)9789811560132

The science of communicating secret data using multimedia cover like audio, image, video files, etc. is called steganography. The technique steganography is used for hiding a secret data from unauthorized access or user. Steganography technique can be implemented using many different file formats, or in other words we can use different file formats as cover media but here we would talk about digital image-based Steganography for its obvious advantages. Also, we know that rapid and unimaginable developments in digital image processing methods make researcher work even more harder to achieve the ultimate objectives of steganography like robustness, security, resistance to different attacks, and payload capacity. The steganography method also confirms that the methodology or technique also increases the quality of the stego image keeping secure the secret data. The quality measures are PSNR and MSE. Through the following paper, we will study various states of art methods for steganography and compare the same so that it would be a great and ready reference material for the research scholars who are working on digital image Steganography. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Steganography

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A High Precision Large Area Scanner for Ancient Painting and Calligraphy

引用

International conference on Materials Engineering for Advanced Technologies (ICMEAT2011)

作者： Chen, Xianghua Shi, Xifan Zhejiang Univ Technol Zhijiang Coll Hangzhou 310024 Zhejiang Peoples R China

ISBN: (纸本)9783037851517

It is of great significance to digitize ancient paintings and calligraphy. A typical way to acquire them is using a linear CCD based large area table scanner. But this kind of solution has great drawbacks in terms of precision as well as scanning range, which prohibit its use in museums and libraries. Our lab has recently developed a new equipment to solve these drawbacks and hopefully it would shed new light on the documentation of ancient paintings and calligraphy. This paper will discuss a feasible way to improve image sharpness in theory including the theoretical optimal aperture determination, the maximum optical resolution as well as the advantage of using large image sensor. The acquiring experiment shows the method and the scanning hardware can achieve satisfactory results.

关键词： image Acquisition digital photography image processing Cultural Heritage Conservation

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Color correcting JPEG compressed images

Color correcting JPEG compressed images

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Final Program and Proceedings of the 5th IS and T/SID Color Imaging conference: Color Science, Systems and applications

作者： Klassen, R. Victor Balasubramanian, Raja De Queiroz, Ricardo Color and Digital Imaging Systems Xerox Corporation Webester NY United States

Many high end printing systems store and/or transmit compressed images to save bandwidth, memory, and disk space. Prior to printing, the system will decompress and then color correct the image to compensate for the characteristics of a particular printer. In the conventional architecture, the decompression step converts the image from some encoded format (e.g. JPEG with Huffman encoding) into the spatial domain. In this domain, the color image may be stored in some standard device independent color space such as LJG/CCIR YCrCb, SMPTE RGB or Kodak Photo Ycc. The ensuing color correction transforms colors from this space to device coordinates. Our proposed technique uses information about the JPEG compressed format to gain efficiency in the color transformation.

关键词： Color image processing

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Computing the success factors in consistent acquisition and recognition of objects in color digital images by explicit preconditioning

Computing the success factors in consistent acquisition and ...

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International conference on Parallel and Distributed processing Techniques and applications

作者： Maglogiannis, IG Zafiropoulos, EP Platis, AN Gravvanis, GA Univ Aegean Dept Informat & Commun Syst Engn GR-83200 Karlovassi Samos Greece Natl Tech Univ Athens Sch Elect & Comp Engn GR-15773 Athens Greece Hellen Open Univ Dept Comp Sci Patras Greece

The paper studies the factors influencing the consistent acquisition and recognition of object's color and border features in digital imaging. The proposed image acquisition process is utilized by a computer supported imaging system implementing the acquisition and analysis of skin lesion images supporting medical diagnosis. In addition the same approach may be used for several problems requiring reliable color measurement and object identification. Two methodologies are adopted: The Bayesian Networks, which provide an efficient way of reasoning under uncertainty and are used to incorporate the expert judgement into the estimation of the probability of successful operation, and a Markov chain approach, which is generally used for the dynamic modeling of the system behavior. The Markov chain model requires asymptotically the solution of sparse linear systems. Explicit preconditioned methods are used for the efficient solution of the derived sparse linear system, and the parallel implementation of the dominant computational part is exploited.

关键词： digital image acquisition camera calibration color measurement reproducibility computer vision Bayesian networks Markov modeling Markov Reward Models approximate inverses preconditioning parallel computations

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