By M. Ghanbari
An absolutely revised and considerably up to date second version of the best-selling name: 'An creation to straightforward Codecs', (IEE 1999, most sensible e-book of the yr 2000 by way of IEE) this ebook discusses the expansion of electronic tv expertise 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 photos and their trade among laptop systems.ITU and ISO/IEC criteria are actually commonly permitted within the picture/video coding field.This booklet offers an authoritative clarification of photograph and video coding algorithms, operating from easy rules via to the complex video-compression platforms now being constructed. considered one of its major pursuits is to explain the explanations at the back of the advent of a regular codec for a particular software and its selected parameter. This booklet will let readers to understand the basics had to layout a video codec for any given program and may turn out to be a priceless source for engineers operating during this field.Also available:Telecommunication Networks, second variation - ISBN 9780852968840Telecommunications site visitors, price lists and prices - ISBN 9780863411458
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5 Problems 1. In a PAL system, determine the values of the three colour primaries R, G and B for the following colours: red, green, blue, yellow, cyan, magenta and white. 2. Calculate the luminance and chrominance values of the colours in problem 1, if they are digitised into 8 bits, according to CCIR-601 specification. 3. Calculate the horizontal scanning line frequency for CCIR-601/625 and CCIR601/525 line systems and hence their periods. 4. 5 MHz sampling rate. Find the number of pixels per scanning line.
However, in comparing codecs, PSNR or any objective measure should be used with great care to ensure that the types of coding distortions are not significantly different from each other. For instance, objective results from the blockiness distortion produced by the block-based video codecs can be different from the picture smearing distortion introduced by the filter-based codecs. The fact is that even the subjects may interpret these distortions differently. It appears that expert viewers prefer blockiness distortion to the smearing, and nonexperts’ views are opposite!
B. Find such an expression for PSNR. c. Calculate the minimum bit per pixel required for quantising video, such that PSNR is better than 58 dB. (Hint: the mean-squared quantisation error of a uniformly quantised waveform with step size D is D2/12) References 1. 2. 3. 4. 5. 6. 7. N. : Video codec standardisation in CCITT study group XV. Signal Process. , 1989, 1, pp. , GHANBARI, M. : ‘An objective measurement tool for MPEG video quality’. , 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.