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Presently, distributed video coding (DVC) arouse high research interests due to the distinct contribution to the low-complexity encoding. In this paper, we propose a hash-based DVC, where the hash bits are compressed by a rate-adaptive low density parity coding accumulate (LDPCA) and sent to aid the decoder in motion estimation. The hash bit-rate is ideally near to its conditional entropy, so we name...
More and more researchers focus on the visual cryptography scheme that embeds more than one secret image. Most of them generate size-expanded transparencies for decoding only by human eyes. In this paper, a non-expansible flip-flop visual cryptography (FFVC) scheme is proposed. Firstly, stacking two generated transparencies, one of the secret images can be decoded. Another secret image can be decoded...
The offered algorithm stability to illegal decoding fully corresponds to RSA algorithm stability. Nevetherless, according to practical utilization of described RSA modification, in the coded image we managed to achieve complete noising and avoid domains of similarity (Fig. 5). At the same time to display outlines of the sent image becomes practically impossible. It gave possibility to level possibilities...
This paper proposes a method to encrypt an image in two shares with following properties. (1) The method is suitable for binary, gray level or color image encryption. (2) The bit error rates are adjustable, and thus the secret image can be recovered to different extents including lossless and nearly lossless. (3) Sizes of the share images are flexible to be changed, and thus the method can be used...
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