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Digital Picture Processing, 2nd Edition
book

Digital Picture Processing, 2nd Edition

by Azriel Rosenfeld, Avinash C. Kak
January 2014
Intermediate to advanced content levelIntermediate to advanced
435 pages
18h 42m
English
Morgan Kaufmann
Content preview from Digital Picture Processing, 2nd Edition
250
6 Enhancement
High-emphasis filtering in conjunction with a logarithmic transformation
of the gray scale can sometimes be used to reduce shading effects, due to
varying illumination, in a picture without degrading the detail in the picture.
As indicated at the end of Section 6.2.2, a simplified model for the picture
gray level is /(x, y) = I(x, y)R(x, y\ where / and R are illumination and
reflectivity, and where / is primarily composed of low spatial frequencies.
We cannot reduce the effects of / on / by simply boosting the high frequencies,
since / and R are combined multiplicatively, rather than additively. How-
ever, if we take logs o ...
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Publisher Resources

ISBN: 9780323139915