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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331-340 订阅

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Data compression techniques in image compression for multimedia systems

Data compression techniques in image compression for multime...

引用

Proceedings of the 1996 Southcon Conference

作者： Rajaravivarma, V. Lord, Eugenio Barker, Jonathan NC A&T State Univ Greensboro United States

Currently digital video Interface (DVI), Joint Photographic Experts Group (IPEG), and Motion Pictures Experts Group (MPEG) are the three compression techniques that are widely used. Many of these algorithms employ the Discrete Cosine Transform (DCT) because of its excellent energy compaction to achieve data compression. Even with the amount of intensive computations used with the DCT algorithm, grayscale images still require millions of computations. Extending this to color images or moving images, require billions of computations. Data compression techniques for multimedia systems is a step towards reducing the intensity of computations employing fast transform algorithms.

关键词： Image compression

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Virtual zero-tree wavelet transform coding Of super high definition images

Virtual zero-tree wavelet transform coding Of super high def...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Wang, Q Ghanbari, M UNIV ESSEX DEPT ELECT SYST ENGNCOLCHESTER CO4 3SQESSEXENGLAND

ISBN: (纸本)0819423564

A fully compatible and scalable coding scheme for super high definition images has been developed. Wavelet decomposition is performed such that the low frequency band is of CIF order, which forms a low-resolution core of the full sized video, and is coded by MPEG. The high frequency wavelet coefficients are coded by the proposed virtual zerotree which encodes the wavelets more efficiently than the simple zerotree. Embedded in the scheme is also the hierarchical motion compensation that gives high performance with a large capable compensation range, requires minimum computation, and reduces overhead motion information. With its scalability, data prioritization and precise bit-rate control, the scheme is suitable to code SHD video in multimedia applications.

关键词： video coding high quality images multimedia wavelet transform

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Lossless image compression based on a generalized recursive interpolation

Lossless image compression based on a generalized recursive ...

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Conference on digital compression technologies and Systems for video Communications

作者： Aiazzi, B Alba, PS Alparone, L Baronti, S Lotti, F CNR IROENELLO CARRARA RES INST ELECTROMAGNET WAVESI-50127 FLORENCEITALY

ISBN: (纸本)0819423564

A variety of image compression algorithms exists for applications where reconstruction errors are tolerated. When lossless coding is mandatory, compression ratios greater than 2 or 3 are hard to obtain. DPCM techniques can be implemented in a hierarchical way, thus producing high- quality intermediate versions (tokens) of the input images at increasing spatial resolutions. Data retrieval and transmission can be achieved in a progressive fashion, either by stopping the process at the requested resolution level, or by recognizing that the image being retrieved is no longer of interest. However, progressiveness is usually realized with a certain performance penalty with respect to the reference DPCM (i.e., 4-pel optimum causal AR prediction). A generalized recursive interpolation (GRINT) algorithm is proposed and shown to be the most effective progressive technique for compression of still images. The main advantage of the novel scheme with respect to the standard hierarchical interpolation (HINT) is that interpolation is performed in a separable fashion from all error-free values, thereby reducing the variance of interpolation errors. Moreover, the introduction of a parametric half-band interpolation filter produces further benefits and allows generalized interpolation. An adaptive strategy consists of measuring image correlation both along rows and along columns and interpolating first along the direction of minimum correlation. The statistics of the different subband-like sets of interpolation errors are modeled as generalized Gaussian PDFs, and individual codebooks are fitted for variable length coding. The estimate of the shape factor of the PDF is based on a novel criterion matching the entropy of the theoretical and actual distributions. Performances are evaluated by comparing GRINT with HINT, and a variety of other multiresolution techniques. Optimum 4-pel causal DPCM and lossless JPEG are also considered for completeness of comparisons, although they are not p

关键词： image compression medical images lossless compression non-causal DPCM hierarchical interpolation directional interpolation source modeling generalized Gaussian PDF PDF model estimation model-based Huffman coding

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Methods for encrypting and decrypting MPEG video data efficiently 96

Methods for encrypting and decrypting MPEG video data effici...

引用

Proceedings of the 1996 4th ACM International Multimedia Conference

作者： Tang, Lei Carnegie Mellon Univ Pittsburgh United States

ISBN: (纸本)9780897918718

Multimedia data security is very important for multimedia commerce on the Internet such as video-on-demand and real-time video multicast. However, traditional cryptographic algorithms for data secrecy such as DES are not fast enough to process the vast amount of data generated by the multimedia applications to meet the real-time constraints required by the multimedia applications. How to incorporate cryptographic technology with digital image processing technology to provide multimedia security does not seem to be considered in the previous literatures. The main contribution of this paper is the idea of incorporating cryptographic techniques (random algorithms) with digital image processing techniques (image compression algorithms) to achieve compression (decompression) and encryption (decryption) in one step. One of our methods is almost as efficient as the existing video encoding and decoding process while providing considerable level of security without affecting the quality of images when decrypted. Our methods are also adjustable to provide different levels of security for different requirements of the multimedia applications. Our methods are based on the widely used JPEG and MPEG standards. We also conduct a series of experimental studies to test and evaluate our algorithms.

关键词： Security of data

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Proceedings of the 1996 7th IEEE digital Signal Processing Workshop

Proceedings of the 1996 7th IEEE Digital Signal Processing W...

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Proceedings of the 1996 7th IEEE digital Signal Processing Workshop

The proceedings contains 131 papers from the 1996 IEEE digital Signal Processing Workshop. Topics discussed include: data compression, bandwidth compression, signal filtering, filter banks, image compression, block transforms, color image processing, video coding, multichannel signals, spread spectrum communications, interference suppression, speech processing, speech coding, algorithms, VLSI circuits, digital signal processing architectures, parameter estimation, error correction, error analysis, fiber optics communication, neural networks, digital filters and wave packet transforms.

关键词： digital signal processing

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Rate reduction techniques for MPEG-2 video bit streams

Rate reduction techniques for MPEG-2 video bit streams

引用

Conference on digital compression technologies and Systems for video Communications

作者： Assuncao, P Ghanbari, M UNIV ESSEX DEPT ELECT SYST ENGNCOLCHESTER CO4 3SQESSEXENGLAND

ISBN: (纸本)0819423564

Rate control is usually an intrinsic function of the video coding algorithm, responsible for matching the available bandwidth of the communication channel to the output bit stream. However, many of the forthcoming video services will use pre-encoded video, in compressed format, for storage and transmission purposes. In this case, the rate control function should work on the compressed bit stream by reducing its bit rate according to the network demand, which can be either static or dynamic. Bit rate reduction of compressed video is needed not only when pre-encoded video is transmitted, but also in video multicasting where several users receive the same bit stream through different channels. A similar problem results from the interactivity with the user in video on demand services, where each user is offered the possibility of choosing the amount of bandwidth assigned to its channel. In this paper we analyze rate reduction techniques for compressed video in terms of complexity and final picture quality. We propose a new scheme, working entirely in the frequency domain, for bit rate reduction of compressed video. It is a low delay and drift free video transcoder that outperforms a re-encoding system and performs very close to a normal encoder using uncompressed video.

关键词： MPEG-2 rate control video transcoding

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Medical image compression in teleradiology using low-bit rate communication networks.

Medical image compression in teleradiology using low-bit rat...

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Conference on digital compression technologies and Systems for video Communications

作者： Kim, MB Yeoun, BS Cho, YD Song, MS Lee, JS Kim, DK SAMSUNG ADV INST TECHNOL CORE TECHNOL RES CTRSUWON 440600SOUTH KOREA

ISBN: (纸本)0819423564

Teleradiology is defined as the practice of radiology at a distance. Medical images are acquired from one location and are transmitted to one or more distant sites where they are displayed for a diagnosis. Timely availability of medical images via a variety of communication networks is one of the primary goals of teleradiology. In this paper, we propose a medical image compression that can be effectively utilized in the teleradiology system using low-bit rate communication networks. For this purpose, we make use of regions of interest (ROIs) that may be clinically important in medical images. Our study shows that our proposed compression method can reduce the transmission time significantly if the ratio of ROI in the image is small. For example, if the twenty percent of an image belongs to ROI, (ROI ratio equals 0.2), the compression ratio is increased by the scale of about three compared with lossless compression. Accordingly the transmission time is reduced by the same scale. As well, by preserving the clinically important regions, the risk of wrong diagnosis is much reduced compared with lossy compression.

关键词： medical image compression regions of interest DCT (Discrete Cosine Transform) teleradiology DICOM

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Autosophy information theory provides lossless data and video compression based on the data content

Autosophy information theory provides lossless data and vide...

引用

Conference on digital compression technologies and Systems for video Communications

作者： Holtz, K Holtz, E Holtz, D OMNI DIMENS NETWORKS SAN FRANCISCOCA 94109

ISBN: (纸本)0819423564

A new autosophy information theory provides an alternative to the classical Shannon information theory. Using the new theory in communication networks provides both a high degree of lossless compression and virtually unbreakable encryption codes for network security. The bandwidth in a conventional Shannon communication is determined only by the data volume and the hardware parameters, such as image size; resolution; or frame rates in television. The data content, or what is shown on the screen, is irrelevant. In contrast, the bandwidth in autosophy communication is determined only by data content, such as novelty and movement in television images. It is the data volume and hardware parameters that become irrelevant. Basically, the new communication methods use prior 'knowledge' of the data, stored in a library, to encode subsequent transmissions. The more 'knowledge' stored in the libraries, the higher the potential compression ratio. 'Information' is redefined as that which is not already known by the receiver. Everything already known is redundant and need not be re-transmitted. In a perfect communication each transmission code, called a 'tip,' creates a new 'engram' of knowledge in the library in which each tip transmission can represent any amount of data. Autosophy theories provide six separate learning modes, or omni dimensional networks, all of which can be used for data compression. The new information theory reveals the theoretical flaws of other data compression methods, including: the Huffman; Ziv Lempel; LZW codes and commercial compression codes such as V.42bis and MPEG-2.

关键词： Data communications Receivers Data compression Televisions Binary data Image compression Information theory Computer programming Image transmission Transmitters

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Application of super high definition images to teleradiology and telepathology

Application of super high definition images to teleradiology...

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EUROPTO Conference on digital compression technologies and Systems for video Communications

作者： Suzuki, J NIPPON TELEGRAPH & TEL PUBL CORP OPT NETWORK SYST LABS YOKOSUKA KANAGAWA 23803 JAPAN

ISBN: (纸本)0819423564

It was recognized early on that the digitization of medical information would advance the efficiency of diagnostic technology. However, the digitization of image data, which makes up the majority of medical information, is dependent on advances in technologies such as input, processing, transmission, storage, and display. Insufficient advances in such technologies has effectively limited the digitization of image data for medical use. The result of this has been non-networked systems or LANs confined to a single hospital. Such isolated systems integrate only portions of digital medical images such as x-ray computer tomography (CT), magnetic resonance (MR), and computed radiography (CR). Fortunately, recent advances in the areas of super high definition image I/O, high-quality encoding, ATM-based high speed transmission, and high-capacity storage has turned the tide in favor of the digitization and networking of all medical information. This paper focuses on the digitization and networking of medical image information used within hospitals and provides a multifaceted study of the technologies necessary for these advances. This allows us to discuss the present state of related technical developments and the level that has been attained so far. In addition, we have targeted image information that demands the highest level of quality (radiological and pathological images) for application in medical diagnosis using super high definition images, which have a spatial resolution of at least 2048 by 2048 pixels and a temporal resolution of at least 60 frames per second with progressive scanning. We cover the concrete issues and approaches to solutions that must be investigated when building and networking a digital system.

关键词： super high definition images telemedicine x-ray images pathological microscopic images image compression image transmission digital image quality

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Noise reduction in DCT coded images by estimating optimal quantized values

Noise reduction in DCT coded images by estimating optimal qu...

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EUROPTO Conference on digital compression technologies and Systems for video Communications

作者： Tanimoto, M Narita, K Fujii, T Kimoto, T NAGOYA UNIV GRAD SCH ENGN CHIKUSA KU NAGOYA AICHI 46401 JAPAN

ISBN: (纸本)0819423564

This paper proposes a new scheme to reduce the quantization noise in DCT coded images by estimating optimal quantized values. In the proposed scheme, the quantized value of DCT coefficients is shifted from the middle of the quantization step to the mean value of the amplitude distribution of DCT coefficients in the quantization step. The values of the shift minimizing the quantization noise power are obtained experimentally. A simple scheme approximating these values is derived so that the modification factors of the quantized values can be estimated at the decoder. About 0.5 dB improvement of SNR is achieved experimentally by the proposed scheme. By smoothing the boundaries of DCT blocks in the decoded images further, 1.0 dB improvement of SNR is achieved and visually better images are obtained.

关键词： Signal to noise ratio Quantization Image analysis Denoising Cameras Linear filtering Visualization Factor analysis Image filtering Image compression

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