DocumentCode :
3194352
Title :
How anti-aliasing filter affects image contrast: An analysis from majorization theory perspective
Author :
Tang, Ketan ; Au, Oscar C. ; Fang, Lu ; Yu, Zhiding ; Guo, Yuanfang
Author_Institution :
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, China
fYear :
2011
fDate :
11-15 July 2011
Firstpage :
1
Lastpage :
6
Abstract :
When we design an anti-aliasing low pass filter, it is usually an IIR filter. We need to truncate the filter to an FIR filter. One may think that the more taps there are, the better the image quality is. However, we find that there exists an optimal value of tap number that will give the best visual quality. Filters with larger or smaller number of taps will degrade the image quality, due to the fact that the image contrast is reduced. In this paper we analyze this phenomenon using majorization theory and find that the image contrast can be formulated as a Schur convex function on filter coefficients. We also propose an effective method to choose the best filter so that the image contrast is maximized, so as to give best visual quality.
Keywords :
Schur convex; anti-aliasing filter; contrast; majorization theory;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Multimedia and Expo (ICME), 2011 IEEE International Conference on
Conference_Location :
Barcelona, Spain
ISSN :
1945-7871
Print_ISBN :
978-1-61284-348-3
Electronic_ISBN :
1945-7871
Type :
conf
DOI :
10.1109/ICME.2011.6011908
Filename :
6011908
Link To Document :
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