Standard Codecs (Iet Telecommunications Series), 3rd Edition by Mohammed Ghanbari

By Mohammed Ghanbari

A completely revised and considerably up to date second variation of the best-selling name: 'An creation to straightforward Codecs', (IEE 1999, most sensible booklet of the 12 months 2000 by means of IEE) this publication discusses the expansion of electronic tv know-how and the revolution in photo and video compression (such as JPEG2000, broadcast television, video phone), highlighting the necessity for standardisation in processing static and relocating pictures and their alternate among desktop systems.ITU and ISO/IEC criteria at the moment are largely permitted within the picture/video coding field.This ebook offers an authoritative clarification of photo and video coding algorithms, operating from easy rules via to the complex video-compression platforms now being constructed. certainly one of its major targets is to explain the explanations in the back of the advent of a customary codec for a particular program and its selected parameter. This ebook will allow readers to understand the basics had to layout a video codec for any given software and may end up to be a precious 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 (Iet Telecommunications Series), 3rd Edition

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264 in Chapter 11, and it is recommended to be read before moving into Chapter 11. 263 coded video over 8 Standard codecs: image compression to advanced video coding unreliable channels. In this regard, error correction for transmission of video over mobile networks is discussed. Methods of improving the robustness of the codecs against channel errors are given, as well as postprocessing and concealment of erroneous video are explained. 263 video. In Chapter 10, a new method of video coding based on the image content is presented.

Hence, a key property of UTQ is that the step sizes can be easily adapted to facilitate rate control. A further two subclasses of UTQ can be identified within the standard codecs, namely those with and without a dead zone. 5 and are hereafter abbreviated as UTQ-DZ and UTQ, respectively. The term dead zone commonly refers to the central region of the quantiser, whereby the coefficients are quantised to zero. Typically, UTQ is used for quantising intraframe DC, F(0, 0), coefficients, while UTQ-DZ is used for the AC and the DC coefficients of interframe prediction error.

The total bit rate is then calculated by considering that there are half the luminance pixels for each of the chrominance pixels, and with 8 bit/pixel, the total bit rate becomes 10 368 000 Â 2 Â 8 ¼ 165 888 000 bit/s. 5 Â 106 Â 2 Â 8 ¼ 216 Mbit/s. Either of these values is much greater than the equivalent analogue bandwidth; hence, the video compression to reduce the digital bit rate is very demanding. In the following chapters, we will show how such a huge bit rate can be compressed down to less than 10 Mbit/s, without noticeable effect on picture quality.

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