By M. Ghanbari
An absolutely revised and considerably up to date 2d variation of the best-selling identify: 'An creation to straightforward Codecs', (IEE 1999, top publication of the 12 months 2000 by way of IEE) this ebook discusses the expansion of electronic tv expertise and the revolution in picture and video compression (such as JPEG2000, broadcast television, video phone), highlighting the necessity for standardisation in processing static and relocating photos and their trade among laptop systems.ITU and ISO/IEC criteria are actually largely permitted within the picture/video coding field.This publication offers an authoritative clarification of photograph and video coding algorithms, operating from easy rules via to the complex video-compression structures now being built. one in every of its major ambitions is to explain the explanations at the back of the advent of a regular codec for a particular program and its selected parameter. This e-book will permit readers to understand the basics had to layout a video codec for any given software and may turn out to be a worthwhile source for engineers operating during this field.Also available:Telecommunication Networks, second version - ISBN 9780852968840Telecommunications site visitors, price lists and prices - ISBN 9780863411458
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Extra info for Standard Codecs
For example, a horizontal resolution of 360 pixels could be coded by adding eight pixels to the right edge of each horizontal row, bringing the total to 368. 4 Conversion of CCIR-601 to SIF Now 23 macroblocks would be coded in each row. The decoder would discard the extra padding pixels after decoding, giving the final decoded resolution of 360 pixels. The sampling format of 4:2:0 should not be confused with that of the 4:1:1 format used in some digital VCRs. In this format, chrominance has the same vertical resolution as luminance, but horizontal resolution is one quarter.
Hence, flicker-free, high-resolution video requires larger bandwidth. If a frame is formed by the single scanning of a picture, it is called progressive scanning. Alternatively, two pictures may be scanned at two different times, with the lines interleaved, such that two consecutive lines of a frame belong to alternate fields to form a frame. In this case, each scanned picture is called a field, and the scanning is called interlaced. 1 shows progressive and interlaced frames. The concept behind interlaced scanning is to trade-off vertical–spatial resolution with that of the temporal.
1998, 7, pp. 279–294 Chapter 3 Principles of video compression The statistical analysis of video signals indicates that there is a strong correlation both between successive picture frames and within the picture elements themselves. Theoretically, decorrelation of these signals can lead to bandwidth compression without significantly affecting image resolution. Moreover, the insensitivity of the human visual system to loss of certain spatio-temporal visual information can be exploited for further reduction.
Standard Codecs by M. Ghanbari