Anna University , Chennai
Department :IT
Semester :5
Subject Code :It2302
Subject Name :Information Theory and coding
Study Material Description :unit 3 notes
SOURCE CODING: IMAGE AND VIDEO
Image and Video Formats – GIF, TIFF, SIF, CIF, QCIF – Image compression: READ, JPEG – Video
Compression: Principles-I, B, P frames, Motion estimation, Motion compensation, H.261, MPEG
standard
IMAGE COMPRESSION:
Images can be of two basic types:
i) Computer generated (also known as graphical) images.
ii) Digitized images (of both documents and pictures).
Although both types are displayed in the form of a two-dimensional matrix of individual picture elements, normally a graphical image is represented differently in the computer file system.
Typically, this is in the form of a program and, since this type of representation requires considerably matrix of picture elements, whenever possible, graphics are transferred across a network in this form.
In the case of digitized documents and pictures, however, once digitized, the only form of representation is as a two-dimensional matrix of picture elements.
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