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This paper derives and implements a new technique called horizontal and vertical Enhance Gabor discriminant analysis (HVGD) for image representation and recognition. In this approach, we firstly use Gabor wavelets to extract local features at different frequencies and orientations from facial images. The horizontal and vertical principal component analysis (HVPCA) is then applied directly on the Gabor...
In this paper, we propose a format compliant feedback encryption scheme for JPEG2000 by using a chaotic pseudo-random bit generator. This chaotic pseudo-random bit generator is purturbed to enhance cryptographic properties such as cycle length and statistical properties so that it can be used to construct our stream ciphers with higher security. The encrypting time by using our proposed scheme is...
Chaos-based cryptography has several good properties, such as sensitivity to initial conditions, namely, the so-called butterfly effect. However, chaotic maps implemented by computers with finite precision will lead to dynamic degradation. In this paper a perturbed couple chaotic pseudo-random bit generator with good cycle length and statistical property is used to construct a stream cipher for JPEG...
This paper proposed a superresolution (SR) reconstruction method by combining the cross-diamond-hexagonal search (CDHS) block-matching algorithm (BMA) and the simple block-wise motion vector selection (BWMVS) strategy to obtain stable and high quality reconstruction results. The experimental results showed that the reconstruction quality of CDHS BMA is comparable with full search BMA but the computation...
In this paper, a simple block-wise motion vector selection (BWMVS) strategy was incorporated into the motion estimation algorithm. The occlusion that severely damages the quality of the reconstructed video sequence in superresolution (SR) problem is effectively removed. The stability due to the BWMVS could be seen from the reconstruction results in comparison with the standard interpolation.
Based on the Huber-Markov random field (HMRF), this paper adopts the cross-diamond-hexagonal search (CDHS) blocking-matching algorithm to promote the speed of motion estimation in the maximum a posteriori (MAP)-based super resolution (SR) reconstruction. A block-wised motion vector selection (MVS) strategy is proposed to eliminate the unqualified motion vectors due to occlusion occurred in motion...
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