Q. Wu

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Color image segmentation is always an important technique in image processing system. Highly precise segmentation with low computation complexity can be achieved through roughness measurement which approximate the color histogram based on rough set theory. However, due to the imprecise description of neighborhood similarity, the existing roughness measure(More)
—Existing semantically secure public-key search-able encryption schemes take search time linear with the total number of the ciphertexts. This makes retrieval from large-scale databases prohibitive. To alleviate this problem, this paper proposes to organize Searchable Public-Key Ciphertexts with Hidden Structures (SPCHS) for fast keyword search as possible(More)