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论文类型：期刊论文
发表时间：2015-10-01
发表刊物：OPTICS AND LASERS IN ENGINEERING
收录刊物：SCIE、EI、Scopus
卷号：73
页面范围：143-149
ISSN号：0143-8166
关键字：Surface measurement; Phase unwrapping; Coordinate transformation; Fourier differentiation theorem
摘要：Phase unwrapping is a complex step in three-dimensional (3D) surface measurement. To simplify the computation process, Martino et al. proposed a differential algorithm. However, it will result in large error when the orthogonal fringes are not in horizontal or vertical direction. To solve this problem, the relationship between projector's and camera's coordinate systems is introduced. With the data obtained from coordinate transformation, the improved differential algorithm can be used for orthogonal fringes in any direction. Besides that, taking advantage of Fourier differentiation theorem makes operation and calculation simpler. By contrast, the results of experiments show that the proposed method is applicable to the patterns with orthogonal fringes in every direction. In addition, Fourier differentiation theorem effectively increases the speed of differential process. (C) 2015 Elsevier Ltd. All rights reserved.