RATE SCALABLE VIDEO COMPRESSION Bhushan D Patil PhD Research Scholar Department of Electrical Engineering Indian Institute of Technology, Bombay Powai,

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RATE SCALABLE VIDEO COMPRESSION Bhushan D Patil PhD Research Scholar Department of Electrical Engineering Indian Institute of Technology, Bombay Powai, Mumbai 40076

Properties of video signal Video signal is composed of a sequence of successive still images (frames). The sufficiency of the frame rate depends on the image sequence content -- especially the amount and speed of motion -- typical to the application. Transferring of digital video signal requires very much channel capacity (more than 200Mbps).

What is all about in video compression? In compression, unnecessary repetition of image information, i.e. redundancy, is tried to remove from the video signal. The information which is actually needed to understand the image is maintained as well as possible. In order to achieve high compression efficiency, image information is not totally preserved.

Basic components of compression coding: Signal differences Prediction Quantization

Block diagram of a generalized video codec

Motion estimation and compensation

Coder :Example

Scalability Concept: Wavelet SPIHT Number of frame Use of scalability Mobile Displays

Results-1

Result-2 (Effect of Background Motion)

MATLAB Simulations: Analysis of performance at various bit rates Compression ratio.

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