Fractal image compression is a promising new technology that may successfully provide a codec for PC-to-PC video communications. Unfortunately, the large amount of computation needed for the compression stage is a maj...
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ISBN:
(纸本)0819417661
Fractal image compression is a promising new technology that may successfully provide a codec for PC-to-PC video communications. Unfortunately, the large amount of computation needed for the compression stage is a major obstacle that needs to be overcome. This paper introduces the Fast Fractal Image compression algorithm, a new approach to breaking the `speed problem' that has plagued previous efforts. For still images, experiments show that at comparable quality levels the FFIC algorithm is 5 to 50 times faster than the current state of the art. Such an improvement brings real-time video applications within the reach of fractal mathematics.
We present a software implementation of a real-time MPEG video codec on the MediaStation 5000 multimedia system. Unlike other compression systems whose sole function is the encoding or decoding of video data, the Medi...
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ISBN:
(纸本)0819414824
We present a software implementation of a real-time MPEG video codec on the MediaStation 5000 multimedia system. Unlike other compression systems whose sole function is the encoding or decoding of video data, the MediaStation 5000 is capable of performing various real-time operations involving a wide range of multimedia data, including image, graphics, video, and even audio. This programmability is provided by Texas Instruments TMS320C80, better known as Multimedia video Processor (MVP), which is a single-chip multiprocessing device with highly parallel internal architecture. The MVP integrates a RISC processor, four DSP-like processors, an intelligent DMA controller, video controllers, and a large amount of SRAMs onto a single chip. Since the MVP contains such a high degree of parallel features, developing the MPEG software and mapping it to the MVP requires a thorough study of the algorithms and a good understanding of the processor architecture. By exploiting the advanced features of the MVP, the MediaStation 5000 can achieve the MPEG compression and decompression of video sequences in real time.
This paper presents the video processing techniques for indexing MPEG video sequences. Parameters encoded in P- and B-pictures are used to detect scene changes. In the MPEG format, P- and B-pictures consist of two typ...
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ISBN:
(纸本)0819417661
This paper presents the video processing techniques for indexing MPEG video sequences. Parameters encoded in P- and B-pictures are used to detect scene changes. In the MPEG format, P- and B-pictures consist of two types of information: difference matrix and motion vector(s) for every macroblock (MB). Different types of MBs indicate the relationship between the current picture and its reference picture(s). The proposed techniques take advantage of those parameters encoded in the MPEG video streams to detect some changes. Since motion information in the MPEG format is used, these novel techniques are reliable, accurate, and fast. Those techniques and algorithms are presented in detail and examples are provided.
This paper gives a summary of the MPEG/audio compression algorithm. This algorithm was developed by the Motion Picture Experts Group (MPEG), as an International Organization for Standardization (ISO) standard for the ...
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This paper surveys the visual distortions introduced by a compression scheme into the reconstruction of a video sequence. Specifically, the paper will concentrate on systems utilizing motion compensation (MC), differe...
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ISBN:
(纸本)0819417661
This paper surveys the visual distortions introduced by a compression scheme into the reconstruction of a video sequence. Specifically, the paper will concentrate on systems utilizing motion compensation (MC), differential pulse code modulation (DPCM), and the discrete cosine transform (DCT). Such systems are exemplified by the CCITT H.261 and MPEG standards. In addition to the artifacts that have already been widely considered, such as `blocking' and `mosquito' effects, new classifications of artifacts will be presented. A concise characterization and demonstration of each artifact will be provided. This will include the specification of the distribution of the artifact within the reconstructed frames, and its correlation with the local spatial/temporal features within the sequence. Also noted will be the specific causes of the artifacts, with relation to the MC/DPCM/DCT components. Since the human visual system is, typically, the final judge of the quality of the reconstructed sequence, it is also important to note the level of severity of the artifacts that make the artifacts visually noticeable.
MPEG is a standard which defines data formats for coded (compressed) audio, video, and their combination. The Systems part of this work, which is Part 1, defines the coding and related requirements for providing the c...
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ISBN:
(纸本)0819414824
MPEG is a standard which defines data formats for coded (compressed) audio, video, and their combination. The Systems part of this work, which is Part 1, defines the coding and related requirements for providing the combination of audio and video, including key system- level functions. These functions include synchronization of audio and video, multiplexing, clock recovery, guaranteed buffer behavior, program time identification, and many other system-level functions which are required in practice and which are not part of the compression coding of audio and video. MPEG-2 formally known as ISO 13818, and MPEG-2 Systems is ISO 13818-1. Currently MPEG-2 has the status of a Committee Draft, meaning that it has been published for review by participating national bodies, as part of the procedure for becoming an official International Standard.
We describe a technique for videocompression, based on a mosaic image representation obtained from all frames in a scene sequence, giving a panoramic view of the scene. We describe two types of mosaics, static and dy...
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ISBN:
(纸本)0819417661
We describe a technique for videocompression, based on a mosaic image representation obtained from all frames in a scene sequence, giving a panoramic view of the scene. We describe two types of mosaics, static and dynamic, which are suited for storage and transmission applications, respectively. In each case, the mosaic construction process aligns the images using a global parametric motion transformation, usually canceling the effect of camera motion on the dominant portion of the scene. The residual motions that are not compensated by the parametric motion are then analyzed for their significance and coded. The mosaic representation exploits large scale spatial and temporal correlations in image sequences. In many applications where there is significant camera motion (e.g., remote surveillance), it performs substantially better than traditional interframe compression methods, and offers the potential for very low bitrate transmission. In storage applications, such as digital libraries and video editing environments, it has the additional benefit of enabling direct access and retrieval of single frames at a time.
This paper discusses videocompression and decompression strategies for use on general puipose computer systems where no specialized hardware is available. We first examine the alternatives and describe the performanc...
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This paper discusses a new videocompression algorithm called Coefficient Compensation that achieves high performance by optimizing the DCT encoding loop structure, and demonstrates its improvement characteristic as c...
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ISBN:
(纸本)0819414824
This paper discusses a new videocompression algorithm called Coefficient Compensation that achieves high performance by optimizing the DCT encoding loop structure, and demonstrates its improvement characteristic as compared with the conventional JPEG or MPEG I/P picture encoding under the condition that movement compensation is not available. The first part of the paper analyzes the performance of the DCT encoding loop structure, the method of optimization and the concept of soft-decision. The second part reports on the simulation results. Encoding performance is tested by various MPEG test sequences compressed in 20 Mbits/sec. The difference between JPEG and MPEG I is in the quantization table. For JPEG, the quantization table widely accepted as one producing a good compression quality is used. All the encoded binary outputs are fully compatible to the MPEG2 syntax but additional 2 bits/block information is coded as the user data for the Coefficient Compensation.
An effective video coding algorithm is described. It is based on a new quadtree block merging algorithm and wavelet decomposition of video signals using orthonormal and biorthogonal filter banks. With the merging algo...
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ISBN:
(纸本)0819417661
An effective video coding algorithm is described. It is based on a new quadtree block merging algorithm and wavelet decomposition of video signals using orthonormal and biorthogonal filter banks. With the merging algorithm the motion compensated predicted images are represented by a small set of rectangular regions in order to improve the coding efficiency and to minimize the border effects associated to the wavelet transform. A new solution to the problem of processing finite length signals by wavelet transforms, based on time-varying perfect reconstruction filter banks will be developed. Results of coding simulations using the merging algorithm with 8 X 8 and 16 X 16 blocks are presented. Also, subjects such as, choice of the optimal filter bank, boundary effects, optimal scalar quantization of the wavelet coefficients and prediction error filtering by wavelet decompositions will be discussed.
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