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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197Compressive Sensing
projections of image coefcients are quantized to compute the hash values that
are used as watermark. A DSC-based decoder is used to check the integrity.
Similar schemes have also been proposed by Tagliasacchi et al. (2008, 2009).
Another set of techniques used for tampering detection is based on the
semifragile watermark. Unlike the image hashing technique, the semifragile
method embeds the watermark directly into the digital content in order to
ensure the integrity of digital content. Zhang et al. (2011) proposed a tamper-
ing detection, localization, and recovery of original coefcients assuming that
the tampering is sparse. The embedded watermark is image dependent and
the method exploits the sparseness in the dis
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