October 2015
Beginner
551 pages
17h 46m
English
Content preview from A Computational Introduction to Digital Image Processing, 2nd Edition
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Wavelets 451
FIGURE 15.12: An image after DWT thresholding and inversion
can use different wavelets, by using either daub(2) or daub(6), to obtain the Haar filter
coefficients or the filter coefficients of the Daubechies-6 wavelet. The results of thresholding
(again with d = 10) are shown in Figures 15.13(a) and (b). We could clearly obtain higher
(a) Using the Haar wavelet (b) Using the Daubechies-6 wavelet
FIGURE 15.13: Use of different wavelets
compression rates by removing more information; this can be obtained by increasing the
threshold value d. We will try with d = 30 and d = 50, and using the Daubechies-4 wavelet:
452 A Computational Introduction to ...
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