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Proceedings Paper

Measurement of discontinuities on 3D objects using digital moire
Author(s): Jiarui Liao; Lilong Cai
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Paper Abstract

In this paper, a two-dimensional, binary fringe pattern is designed as structured light for 3D measurement. A feature, i.e., a white cross, is placed in the center of the fringe grating. The cross serves as the axes of a reference frame. White square grids are alternated by black stripes vertically or horizontally elsewhere. The relative position of a given point on the fringe with respect to the center can be identified. When the fringe pattern is projected onto the surface of the object, its image is distorted. Therefore, image processing and pattern recognition algorithms are designed to calculate which row and column the particular point belongs to in the original fringe-frame. The pair of emitting and receiving angles for each point in the fringe and CCD frames, respectively, is acquired. Also the coordinate of each 3D point can be calculated. Compared with traditional digital moire methods, this method achieves an absolute measurement of 3D surfaces because the information contained in the pattern is globally structured. Therefore, discontinuity measurement can be solved more easily. Resolution of the proposed method is higher than that of current methods of coding patterns under the same line width limitation due to the principle of pattern design.

Paper Details

Date Published: 26 January 2006
PDF: 11 pages
Proc. SPIE 6056, Three-Dimensional Image Capture and Applications VII, 605602 (26 January 2006); doi: 10.1117/12.641558
Show Author Affiliations
Jiarui Liao, The Hong Kong Univ. of Science and Technology (Hong Kong China)
Lilong Cai, The Hong Kong Univ. of Science and Technology (Hong Kong China)


Published in SPIE Proceedings Vol. 6056:
Three-Dimensional Image Capture and Applications VII
Brian D. Corner; Peng Li; Matthew Tocheri, Editor(s)

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