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检索条件"任意字段=Digital Video Compression: Algorithms and Technologies 1996"

共 515 条记录，以下是441-450 订阅

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SCAN IMAGE compression ENCRYPTION HARDWARE SYSTEM

SCAN IMAGE COMPRESSION ENCRYPTION HARDWARE SYSTEM

引用

Conference on digital video compression - algorithms and technologies 1995

作者： BOURBAKIS, NG BRAUSE, R ALEXOPOULOS, C SUNY BINGHAMTON DEPT EEAAAI LABBINGHAMTONNY 13902

ISBN: (纸本)0819417661

This paper deals with the hardware design of an image compression/encryption scheme called SCAN. The scheme is based on the principles and ideas reflected by the specification of the SCAN language. SCAN is a fractal based context-free language which accesses sequentially the data of a 2D array, by describing and generating a wide range (near (nxn)) of space filling curves (or SCAN patterns) from a short set of simple ones. The SCAN method uses the algorithmic description of each 2D image as SCAN patterns combinations for the compression and encryption of the image data. Note that each SCAN letter or word accesses the image data with a different order (or sequence), thus the application of a variety of SCAN words associated with the compression scheme will produce various compressed versions of the same image. The compressed versions are compared in memory size and the best of them with the smallest size in bits could be used for the image compression/encryption. Note that the encryption of the image data is a result of the great number of possible space filling curves which could be generated by SCAN. Since the software implementation of the SCAN compression/encryption scheme requires some time, the hardware design and implementation of the SCAN scheme is necessary in order to reduce the image compression/encryption time to the real-time one. The development of such an image compression encryption system will have a significant impact on the transmission and storage of images. It will be applicable in multimedia and transmission of images through communication lines.

关键词： SCAN LANGUAGE IMAGE compression IMAGE DECOMPOSITION SCANNING algorithms IMAGE ENCRYPTION

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SOFTWARE CODEC BASED FULL MOTION video CONFERENCING ON THE PC USING VISUAL PATTERN IMAGE SEQUENCE CODING

SOFTWARE CODEC BASED FULL MOTION VIDEO CONFERENCING ON THE P...

引用

Conference on digital video compression - algorithms and technologies 1995

作者： BARNETT, BS BOVIK, AC UNIV TEXAS DEPT COMP & ELECT ENGNAUSTINTX 78712

ISBN: (纸本)0819417661

This paper presents a real time full motion video conferencing system based on the Visual Pattern Image Sequence Coding (VPISC) software codec. The prototype system hardware is comprised of two personal computers, two camcorders, two frame grabbers, and an ethernet connection. The prototype system software has a simple structure. It runs under the Disk Operating System, and includes a user interface, a video I/O interface, an event driven network interface, and a free running or frame synchronous video codec that also acts as the controller for the video and network interfaces. Two video coders have been tested in this system. Simple implementations of Visual Pattern Image Coding and VPISC have both proven to support full motion video conferencing with good visual quality. Future work will concentrate on expanding this prototype to support the motion compensated version of VPISC, as well as encompassing point-to-point modem I/O and multiple network protocols. The application will be ported to multiple hardware platforms and operating systems. The motivation for developing this prototype system is to demonstrate the practicality of software based real time video codecs. Furthermore, software video codecs are not only cheaper, but are more flexible system solutions because they enable different computer platforms to exchange encoded video information without requiring on-board protocol compatible video codex hardware. Software based solutions enable true low cost video conferencing that fits the `open systems' model of interoperability that is so important for building portable hardware and software applications.

关键词： video CONFERENCING video compression HUMAN VISUAL SYSTEM

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WAVELET BASED SCALABLE IMAGE compression

WAVELET BASED SCALABLE IMAGE COMPRESSION

引用

Conference on digital video compression - algorithms and technologies 1995

作者： PANCHANATHAN, S JAIN, A UNIV OTTAWA DEPT ELECT ENGNMULTIMEDIA COMMUN RES LABOTTAWAON KN1 6N5CANADA

ISBN: (纸本)0819417661

In this paper, we present scalable image compression algorithms based on wavelet transform. Recently, the International Standard Organization (ISO) has proposed the JPEG standard for still image compression. JPEG standard not only provides the basic features of compression (baseline algorithm) but also provides the framework of reconstructing images in different picture qualities and sizes. These features are referred to as SNR and spatial scalability, respectively. Spatial scalability can be implemented using the hierarchical mode in the JPEG standard. However, the standard does not specify the downsampling filters to be used for obtaining the progressively lower size images. A straightforward implementation would employ mean downsampling filters. However, this filter does not perform very well in extracting the features from the full size image resulting in poor quality images and a lower compression ratio. We present a wavelet transform based technique for achieving spatial scalability (within the framework of hierarchical mode). Our simulation results confirm the substantial performance improvement and superior subjective quality images using the proposed technique. Most importantly, the wavelet based technique does not require any modifications to existing JPEG decoders.

关键词： Image compression Image quality Image filtering Spatial resolution Standards development Wavelet transforms Wavelets Image quality standards Signal to noise ratio Image resolution

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digital STORAGE MEDIA IN THE digital HIGHWAY ERA

DIGITAL STORAGE MEDIA IN THE DIGITAL HIGHWAY ERA

引用

1995 IEEE International Solid-State Circuits Conference

作者： YAMADA, T SONY CORP YOKOHAMAKANAGAWA 240JAPAN

ISBN: (纸本)078032496X

Consumer-use digital VCRs and video discs have been developed integrating state-of-the-art magnetic and optical recording technologies and sophisticated video compression algorithms. For the future evolution of the digital storage media, further improvement of the compression algorithm is essential. Low-power low-cost VLSI logic and memory technology, and logic-memory compatible process technology are keys for realization of the next-generation compression algorithm and the digital storage medium. A dream for digital storage media is an all solid-state consumer video recorder that will become available sometime in the 21st century.

关键词： digital storage

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SCALABLE IMAGE compression USING COMBINED WAVELET TRANSFORM AND VECTOR QUANTIZATION

SCALABLE IMAGE COMPRESSION USING COMBINED WAVELET TRANSFORM ...

引用

Conference on digital video compression - algorithms and technologies 1995

作者： PANCHANATHAN, S JAIN, A GAMAZ, N UNIV OTTAWA DEPT ELECT ENGNMULTIMEDIA COMMUN RES LABOTTAWAON K1N 6N5CANADA

ISBN: (纸本)0819417661

In this paper, we propose vector quantization (VQ) based scheme for scalable image compression. Scalability is a generic feature referring to image representation in different sizes (spatial scalability) and/or picture qualities (SNR scalability). VQ is a powerful technique for low bit rate image compression. However the conventional VQ approach does not provide a scalable bitstream. We propose a VQ based algorithm (SVQ) to achieve spatial scalability. In SVQ technique, a pyramidal structure of three layers is built by applying 2D wavelet downsampling filters on the input image. The label stream is then made scalable such that a smaller-size image can be obtained by decoding a portion of the bitstream. This image can be further enhanced in size by progressively decoding the remaining bits. This algorithm ensures partial decodability of VQ labels by using separate codebooks one for each spatial resolution. We then propose a combination of wavelet transform and SVQ technique called WSVQ to exploit the cross-correlations among wavelet sub-bands. Simulation results confirm the substantial reductions in bit rate and superior subjective image quality at each spatial resolution using the proposed algorithm, at a significantly reduced computational complexity.

关键词： Image compression Wavelets Wavelet transforms Spatial resolution Quantization Image quality Image resolution Signal to noise ratio Image enhancement Image filtering

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MOTION-COMPENSATED INTERPOLATION USING TRAJECTORIES WITH ACCELERATION

MOTION-COMPENSATED INTERPOLATION USING TRAJECTORIES WITH ACC...

引用

Conference on digital video compression - algorithms and technologies 1995

作者： CHAHINE, M KONRAD, J MCGILL UNIV DEPT ELECT ENGNMONTREALPQ H3E 2A7CANADA

ISBN: (纸本)0819417661

This paper is primarily concerned with motion-compensated interpolation of video sequences using multiple images. Due to the extended temporal support of such motion compensation, linear (constant-velocity) trajectory model is often inappropriate, for example due to insufficient temporal sampling. Recently, we have proposed a quadratic (constant-acceleration) trajectory model and a framework for the computation of its parameters. The approach is based on Markov random field models that lead to a regularized formulation solved by multiresolution deterministic relaxation. In this paper, we demonstrate advantages of using accelerated motion over linear trajectories in a plausible application using natural data. We apply the estimated trajectories to motion-compensated interpolation over multiple frames of progressive and interlaced video sequences. The experimental results for `Miss America' and `Femme et arbre' (interlaced) show, respectively, a 4 and 2 dB average improvement in the PSNR of the reconstruction error when quadratic trajectories are used instead of the linear ones. It is interesting to note that in `Miss America' the most significant improvements can be observed in the area of the mouth and the eyes which are in fact likely to exhibit acceleration. We envisage an application of the proposed method to post-processing in very low bit rate video coding.

关键词： MOTION MOTION ESTIMATION MOTION-COMPENSATED PROCESSING INTERPOLATION video CODING

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A MULTIRESOLUTIONAL REGION BASED SEGMENTATION SCHEME FOR STEREOSCOPIC IMAGE compression

A MULTIRESOLUTIONAL REGION BASED SEGMENTATION SCHEME FOR STE...

引用

Conference on digital video compression - algorithms and technologies 1995

作者： SETHURAMAN, S SIEGEL, MW JORDAN, AG CARNEGIE MELLON UNIV SCH COMP SCIINST ROBOTDEPT ELECT & COMP ENGNPITTSBURGHPA 15213

ISBN: (纸本)0819417661

Stereoscopic image sequence transmission over existing monocular digital transmission channels, without seriously affecting the quality of one of the image streams, requires a very low bit-rate coding of the additional stream. Fixed block-size based disparity estimation schemes cannot achieve such low bit-rates without causing severe edge artifacts. Also, textureless regions lead to spurious matches which hampers the efficient coding of block disparities. In this paper, we propose a novel disparitybased segmentation approach, to achieve an efficient partition of the image into regions of more or less fixed disparity. The partitions are edge based, in order to minimize the edge artifacts after disparity compensation. The scheme leads to disparity discontinuity preserving, yet smoother and more accurate disparity fields than fixed block-size based schemes. The smoothness and the reduced number of block disparities lead to efficient coding of one image of a stereo pair given the other. The segmentation is achieved by performing a quadtree decomposition, with the disparity compensated error as the splitting criterion. The multiresolutional recursive decomposition offers a computationally efficient and non-iterative means of improving the disparity estimates while preserving the disparity discontinuities. The segmented regions can be tracked temporally to achieve very high compression ratios on a stereoscopic image stream. © 1995 SPIE. All rights reserved.

关键词： STEREOSCOPIC IMAGE compression DISPARITY ESTIMATION QUADTREE DECOMPOSITION SEGMENTATION MULTIRESOLUTION

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VARIABLE BLOCK SIZE video CODING WITH MOTION PREDICTION AND MOTION SEGMENTATION

VARIABLE BLOCK SIZE VIDEO CODING WITH MOTION PREDICTION AND ...

引用

Conference on digital video compression - algorithms and technologies 1995

作者： ZHANG, K BOBER, M KITTLER, J UNIV SURREY DEPT ELECTR & ELECT ENGNGUILDFORD GU2 5XHSURREYENGLAND

ISBN: (纸本)0819417661

In the paper we are concerned with the efficient coding of image sequences for video- conference applications. In such sequences, large image regions usually undergo a uniform translational motion. Consequently, to maximize the coding efficiency and quality, the codec should be able to segment and estimate multiple translational motions accurately and reliably. Following the above premise, we propose an algorithm which combines several known and new techniques. Firstly, a traditional variable block size motion compensation was used, but employing a novel robust motion estimation algorithm. The algorithm can estimate multiple motions to a sub-pixel accuracy and also provides a reliable motion segmentation. Whenever there exist multiple motions within a block, the motion boundary is recovered and approximated by a straight line. Also, an inter-block motion prediction is used to achieve a further improvement of the compression ratio. A comparison with the H.261 scheme shows that the proposed algorithm produces better results both in terms of PSNR and bit-rate. To judge the contribution of the motion segmentation to the overall performance, experiments have been carried out with a variant of the algorithm where only single motion within any block is allowed. This incapacitated variant emulates a commonly used approach for variable block size coding. The comparison of the proposed and incapacitated variants shows that the use of motion segmentation can lower the bit rate and deliver a better visual quality of the reconstructed image sequence.

关键词： IMAGE SEQUENCE CODING

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Text segmentation using linear transforms 29

Text segmentation using linear transforms

引用

29th Asilomar Conference on Signals, Systems and Computers, ACSSC 1995

作者： Chaddha, Navin Gupta, Anoop Computer Systems Laboratory Stanford University StanfordCA94305 United States

ISBN: (纸本)0818673702

Block-based linear transforms have found widespread use in image and video compression. However, popular compression algorithms using such transforms, such as JPEG, which are very effective in compressing continuous tone images, do not perform well on mixed-mode images which have a substantial text component. With a growing number of applications where such images occur, e.g., color facsimile, digital libraries and educational videos, there are advantages in being able to classify each block as being text or continuous tone. With such a classification, different compression parameters or even algorithms may be employed for the two kinds of data to obtain high compression with minimal loss in visual quality. In this paper we propose algorithms for text segmentation based on a variety of linear transforms. We analyze the algorithms based on the accuracy and robustness of segmentation. Our results show that any of the popular linear transforms (DCT, DHT, DFT, WHT, DWT) can be used for accurate and robust text segmentation. An important practical implication of our results is that system designers can now use the same transform for both segmentation and compression, thus obtaining substantial savings in computational cost while improving quality. © 1996 IEEE.

关键词： Image compression

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Central payload video system (CPVS)

Central payload video system (CPVS)

引用

Advanced Image and video Communications and Storage technologies

作者： Doutreleau, Jean Pedersen, F.H. Serrano, J. European Space Agency/ESTEC Noordwiji Neth

ISBN: (纸本)0819418021

The central payload video system, CPVS, is a highly flexible central video facility designed to perform processing on payload video as well as system video. Although developed under the Columbus program the CPVS can be easily integrated into any space station program such as Freedom and MIR. The CPVS is compatible with component video (Y,C) as well as with composite video (standard NTSC and PAL). The CPVS also supports non standard video high resolution (geometrical) and high frame rate (excellent time resolution) video. The CPVS is converting all received video into digital video. The standard formats are compatible with the world wide recognized standard, D1 (CCIR 601 and CCIR 656 compatible), and the non standard formats are compatible with an extrapolation of the D1 standard. The CPVS is able to process up to eight (8) simultaneous video channels. The CPVS is able to route any input to any or all processing elements using an internal switching and routing unit. The number and type of processing elements can be chosen according to every mission needs and new processing standards can be supported with little or no modification. The selected D1 standard ensures excellent video quality, and the fully redundant design of the CPVS ensures maximum availability of the system for the users. The selection of standard video formats and standard processing algorithms (compression) allows the use on ground of low-cost, off-the-shelf video equipment. The CPVS operation is based on tables which are generated on ground and loaded on board to be executed at a given on board time without the need of real time interaction.

关键词： video signal processing

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