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It is conventionally assumed that steganographic schemes for gray-scale images can be directly applied to color images by embedding messages independently in different color channels. However, the correlation among color channels may be disturbed and it is unclear how to preserve the channel correlation so as to increase empirical security. In this paper, we propose a strategy called CMD-C (clustering...
Fractional-pel motion compensation is very good at improving video coding efficiency, especially for camera-captured content. But for screen content, which is obtained from a computer desktop, motion vectors with integer-precision may be enough to represent the motion in different pictures. Using fractional-pel motion compensation for such content is a waste of bits. Thus, adaptive motion compensation...
Chaos-based dynamics system is typical of the properties of randomness, determinacy and sensitivity to the initial parameters, which makes it suitable for the application of image encryption. In this paper, a wavelet domain color image encryption algorithm based on chaos is proposed. The color plain image is firstly decomposed into R, G, B components. Then an improved 3D chaotic cat map is proposed...
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