July 2015
Intermediate to advanced
600 pages
17h 41m
English
Content preview from Trends in Digital Signal Processing
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May 22, 2015 15:22 PSP Book - 9in x 6in 11-Yong-Ching-Lim-c11
338 Recognition of Human Faces under Different Degradation Conditions
directional wavelets to decompose the frequency sub-bands of the
illumination-enhanced image and the high-frequency components
are thresholded by the minimum frequency coefficient in every
row of the high-frequency sub-bands. If the values of the frequency
coefficients are greater than the threshold value, they are set to zero.
The luminance component is preserved by thresholding the high-
frequency sub-bands and reconstructing by inverse DD-DTCWT. The
reconstructed image is subtracted from the logarithmic image to
extract