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Image and Video Compression
book

Image and Video Compression

by Madhuri A. Joshi, Mehul S. Raval, Yogesh H. Dandawate, Kalyani R. Joshi, Shilpa P. Metkar
November 2014
Intermediate to advanced content levelIntermediate to advanced
236 pages
7h 4m
English
CRC Press
Content preview from Image and Video Compression
43Image Transforms
These values of step size are arrived at by the heuristic approach through
experimentation for the given values of PSNR. These values of step size will
be used in watermark embedding and extraction as described in the next
section.
3.5.2.2 Watermark Embedding
Divide the source image into nonoverlapping blocks of 8 × 8.
Compute the forward DCT for each of these blocks.
Scan the coefcients in a zigzag fashion.
The DC coefcient and the rst AC coefcient are used for water-
mark embedding in the block. These locations are shared between
the encoder and decoder. The other coefcients in the block are left
unaltered. ...
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Publisher Resources

ISBN: 9781482228229