November 2014
Intermediate to advanced
236 pages
7h 4m
English
book
Image and Video Compression
by Madhuri A. Joshi, Mehul S. Raval, Yogesh H. Dandawate, Kalyani R. Joshi, Shilpa P. Metkar
Content preview from Image and Video Compression
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162 Image and Video Compression
Most of the coefcients in the ner scales of the wavelet domain have
extremely small values. Such coefcients can be rounded to zero or thresh-
olding can be applied to them to obtain the k-sparse representation (i.e., the
signal will have only k nonzero coefcients). When measuring the delity
error during signal reconstruction in terms of least square error (LSE) sense,
such a process of thresholding coefcients results in the best approximation.
Such a signal is represented in terms of k basis functions. Figure8.6 repre-
sents an original image and its k coefcients approximation reconstructed
version. In t ...
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