Image automatic mosaics based on contour phase correlation |
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Authors: | Zhang Jing Hu Zhiping Liu Zhitai and Ou Zongying |
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Affiliation: | (1) Mechanical & Electronic Engineering Department, SG Institute of Technology, Beijing, 100041, China;(2) Key Laboratory for Dalian University of Technology Precision & Non-traditional Machining of Ministry of Education, Dalian, 116024, China;(3) Changchun Railway Vehicles Co., Ltd., Changchun, 130062, China |
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Abstract: | The image planar mosaics is studied, and an image automatic mosaics algorithm on the basis of contour phase correlation is
proposed in this paper. To begin with, by taking into account mere translations and rotations between images, a contour phase
correlation algorithm is used to realize the preliminary alignments of images, and the initial projective transformation matrices
are obtained. Then, an optimization algorithm is used to optimize the initial projective transformation matrices, and complete
the precise image mosaics. The contour phase correlation is an improvement on the conventional phase correlation in two aspects:
First, the contours of images are extracted, and the phase correlation is applied to the contours of images instead of the
whole original images; Second, when there are multiple peak values approximate to the maximum peak value in the δ function
array, their corresponding translations can be regarded as candidate translations and calculated separately, and the best
translation can be determined by the optimization of conformability of two images in the overlapping area. The running results
show that the proposed algorithm can consistently yield high-quality mosaics, even in the cases of poor or differential lighting
conditions, existences of minor rotations, and other complicated displacements between images.
Translated from Journal of Dalian University of Technology, 2005, 45(1): 68–74 译自: 大连理工大学学报] |
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Keywords: | image mosaics contour phase correlation projective transformation matrix |
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