09.Circuits and Systems for Video Technology by John G. Webster (Editor) PDF

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By John G. Webster (Editor)

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Packetization delay, which could otherwise hinder interactive multimedia, becomes less of an issue when packets are small. High compression and large packets make interactive communication difficult, particularly for voice. COMPRESSION REQUIREMENTS The algorithms used in a compression system depend on the available bandwidth or storage capacity, the features required by the application, and the affordability of the hardware required for implementation of the compression algorithm (encoder as well as decoder) (4,5).

If the primary receiver of the video signal is a human eye (rather than a machine as in the case of some pattern recognition applications), then transmission or storage of the information that humans cannot perceive is wasteful. Unlike statistical redundancy, the removal of information based on the limitations of human perception is irreversible. The original data cannot be recovered following such a removal. Unfortunately, human perception is very complex, varies from person to person, and depends on the context and the application.

The encoded video is packed into a special format before transmission which maximizes immunity to transmission errors by masking the loss of data in the decoder. The duration and extent of picture degradation due to any one error or group of errors is limited. The decoder is shown in Fig. 8(b). The compressed video data enters the buffer which is complementary to the compressed video buffer at the encoder. The decoding loop uses the motion vectors, transform coefficient data, and other side information to reconstruct the NTSC im- (b) ages.

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09.Circuits and Systems for Video Technology by John G. Webster (Editor)

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