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Image compression by the warped stretch transform is introduced, where the input image is reshaped by a signal-dependent mapping i.e. designed “warp kernel”. The warped image can be downsampled at a lower uniform rate for the same PSNR, effectively achieving reversible and context-aware non-uniform sampling.
Dyadic wavelet coders like JPEG2000 offer robust compression as the image-wise transform effectively compacts energy over large area. However, the global nature of image-wise transform renders the performance at local high-frequency edge area suboptimal. The computation load for global inverse transform also prohibit the use of wavelet on video coding over legacy machines. This paper presents an efficient...
In this paper, the steganographic method proposed by Chang and Tseng (C.C. Chang et al., 2004) is reviewed and the problem of Chang-Tseng scheme during extraction process is described. Two rectified schemes are proposed to overcome the problem so that the embedded secret data can be recovered correctly from the stego-image
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