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This work proposes a novel Multiple Description Coding (MDC) method for encrypted images transmitted over unreliable networks. Here, a pseudorandom permutation is used to mask the original content to protect privacy. The encoder splits the encrypted data into two descriptions, and each description includes different rigid pixels and coefficients generated from orthogonal transform to the elastic pixels...
This work proposes a novel reversible visible watermarking scheme for encrypted images. In the scheme, the original plaintext image is encrypted by bit-wise exclusive-or operation. Although a data-hider does not know the original content, he may modify a part of encrypted data corresponding to the black pixels of a binary watermark image to insert the visible watermark. Meanwhile, some additional...
Fractal coding has been proved useful for image compression. It is also be proved effective for image retrieval based on content. We generate image index file utilize fractal image code, also define the distance between two images as the measure standard for matching similar image. Differently with image compression we don't pay more attention on image compression ratio, but more care about the costing...
Digital watermarking technology means that the hidden information is embedded in digital multimedia data by way of signal processing. In this paper, we firstly analyze the Fast Discrete Curvelet Transforms (FDCT) and Discrete Wavelet Transforms (DWT) which are usually used in image processing and figure out that DWT can not approximate optimally the image which contains the line singularity. And then...
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