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Selection of transforms for better image compression

DSpace at IIT Bombay

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Title Selection of transforms for better image compression
 
Creator RAJPUT, N
SHEVGAONKAR, RK
 
Subject image compression
transforms
dct
wht
mixed transforms
 
Description This paper investigates the compactness aspect of two transforms namely DCT and WHT. We define a parameter called Activity Index (AI) of the image which is the ratio of the first derivative energy in the edges and the total first derivative energy of the image. Sobel edge operator is used to obtain the edges in the image and the first derivative energy in these edges is computed. It is demonstrated that the activity index provides a good measure of the relative compression which the two transforms would give and therefore can help in choosing the transform for better compression of an image. Computations show that the WHT performs better for images having higher AL(close to 1) whereas if the AI is small(less than 0.5) the DCT's performance is superior. If AI is close to 0.5 both transforms give more or less same compression. The algorithm is tested on a variety of natural as well as robotic type of images.
 
Publisher SPIE-INT SOC OPTICAL ENGINEERING
 
Date 2011-10-23T17:53:33Z
2011-12-15T09:11:16Z
2011-10-23T17:53:33Z
2011-12-15T09:11:16Z
1998
 
Type Proceedings Paper
 
Identifier APPLICATIONS OF DIGITAL IMAGE PROCESSING XXI,3460,468-477
0-8194-2915-5
0277-786X
http://dx.doi.org/10.1117/12.323201
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15194
http://hdl.handle.net/100/1960
 
Source Conference on Applications of Digital Image Processing XXI,SAN DIEGO, CA,JUL 21-24, 1998
 
Language English