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The paper presents a method of image retrieval using ellipse shape feature and particle swarm optimization. Based on Fourier descriptor (FD), this method decomposes the contour of image into a series of ellipses. An ellipse can be simply represented with semi-major axis, semi-minor axis, and orient angle. Because the distinction of different ellipses' parameters is remarkable, the weights of parameters...
Due to no damage to original data, the lossless watermarking is more suitable for copyright protection of vector maps. In this paper, a lossless watermarking scheme based on the global characteristics of vector map is proposed. It begins with feature point extraction of each polyline, based on which, for the extracted feature points and non-feature points, the scheme utilizes the relation model established...
A feature Index-based algorithm is presented in the paper, which especially fits to the case that the base image is very large and real-time property is needed. It is divided into four steps: we firstly extract features of the base image, and establish feature-index table advanced; and then extract corresponding features of the sensed image; thirdly, compare the main properties of features and confirm...
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