Jurnal Ilmiah

THE TRANSFORM AND DATA COMPRESSION HANDBOOK

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Judul Seri

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No. Panggil

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Penerbit

: ., 2001

Deskripsi Fisik

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Bahasa

English

ISBN/ISSN

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Klasifikasi

E - Book

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

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Info Detail Spesifik

While this handbook is an exposition of different discrete transforms and their everexpanding applications in the general area of signal processing, the overriding task is to maintain the continuity and connectivity among the chapters. This task is accomplished by the common theme of data compression. The handbook seeks to provide the reader with a wealth of information regarding the transforms (some have been widely used while others have great potential) as well as a demonstration of their power and practicality in data compression. Such compression is a necessary and desirable ingredient in today’s world of massive data storage and data transmission. By providing a plethora of Web sites, ftp locations, and references to general review papers, the chapter authors have expanded the usefulness of this handbook for the common reader. The clear and concise presentations of the ideas and concepts, as well as the detailed descriptions of the algorithms, provide important insights into the applications and their limitations. With the understanding of these concepts, readers can apply the techniques presented in this handbook to their own areas of interest and improve on the performance by marrying this with their own expertise. We are confident that this handbook will be a valuable addition to the bookshelf of anyone actively engaged in or studying the art and science of signal processing. The Transform and Data Compression Handbook is aimed at providing a description of various discrete transforms and their applications in different disciplines. In view of the proliferation of digital data (images, video, text, documents, audio, music, graphics, etc.), it is imperative that the data be mapped from the data domain (in which there are usually redundancies) to a different one (the transform domain) for efficient and economical storage and/or transmission. Transforms by themselves do not provide any compression. However, by reallocation of the energy in the data, transforms provide the possibilities for compression. Techniques such as adaptive quantization and entropy coding applied to the transform coefficients can result in significant reduction in bit rates. Depending on the quality levels required by the end user, other parameters such as human visual/acoustic sensitivity, adaptive scanning, statistical modeling, and variable length coding would further contribute to the bit rate reduction. Generally transforms, wavelet transforms in particular, are well suited for scalable coding (in spatial or temporal domains, or in SNR). This concept facilitates data transmission in embedded bit-stream format, providing for multi-resolution (spatial/temporal) and multiquality (SNR) end products, subject to bandwidth limitation, processing power, and cost constraints. Many international standards relating to audio, video, and data, such as JPEG, H.261, H.262, MPEG-1, MPEG-2, MPEG-4, HDTV, and JPEG-2000, utilize transforms in their overall compression schemes. A number of consumer and commercial products, such as video-CD, DVD, videophone, set-top boxes, digital TV, and digital camera/VCR, have been made possible because of signal compression. Other electronic innovations, such as MP3, video-streaming, and wireless PCS, are completely dependent on the reduction of bit rates made possible by compression. It is not exaggerating to say that data compression is one of the main contributing factors in the explosive growth in information technology. While different coding schemes can accomplish an amazing amount of compression, the cornerstone is still undoubtedly the underlying transform. It is for this reason that the definitions and properties for each of the transforms dealt with in this handbook are presented with such care and detail. The bibliography sections and Web sites provide further sources of information.

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