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A new technique of scanned image restoration is proposed to save a large amount of important old documents. Firstly, by using a high definition scanner, these obsolete documents are scanned page by page to get the HD images. Secondly, different processing techniques are adopted, including removing black holes, deepening handwriting, denoising, etc., so as to make the contents of the files clearer...
Recently, a number of chaos-based image ciphers with permutation-substitution structure have been suggested. Generally, the permutation and substitution are considered as two independent procedures, and individual chaotic maps or systems are iterated and quantified to produce the keystreams for the two stages. In this paper, we suggest a fast color image encryption scheme with both permutation and...
This paper suggests a new fast chaos-based image cipher with a permutation-diffusion structure. In the permutation stage, the original image is scrambled by swapping each pixel with another one at a location chosen by a pseudorandom permutation generated from the logistic map. The initial condition of the map, i.e. the permutation key, is determined by the CityHash value of the original image. Owing...
Nowadays, image enhancement, image restoration and dehazing had made a great progress. This paper addresses the problem of dehazing which is a serious question in computer vision and consumer photography applications. Due to the weakness of the existing methods to compute an accurate transmission map, we use the binocular vision method to compute the depth map. We have used in this paper, the discrepancy...
Facing a great mass of clothing images on the Internet and the improvement of image retrieval result, text-based image retrieval has not perfectly meet the needs of people. Content-based retrieval increasingly shows its powerful search capabilities. But its problems, such as semantic gap and precise search, have not been resolved very well. Image for the clothing, this paper put forward that using...
In this paper, we present a non uniform partitioning point-octree data structure based on level-of-detail (LOD) to implement multiresolution rendering adaptively according to viewpoint. Our approach generates a spatial partitioning hierarchy of irregular point samples in 3D space, and we provide a particular point-octree LOD generation algorithm. We also present a blending array e-zk-buffer to improve...
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