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- W2765328538 abstract "Fringe projection systems have been widely applied in three-dimensional (3D) shape measurements. One of the important issues is how to retrieve the absolute phase. This paper presents a modified gray-level coding method for absolute phase retrieval. Specifically, two groups of fringe patterns are projected onto the measured objects, including three phase-shift patterns for the wrapped phase, and three n-ary gray-level (nGL) patterns for the fringe order. Compared with the binary gray-level (bGL) method which just uses two intensity values, the nGL method can generate many more unique codewords with multiple intensity values. With assistance from the average intensity and modulation of phase-shift patterns, the intensities of nGL patterns are normalized to deal with ambient light and surface contrast. To reduce the codeword detection errors caused by camera/projector defocus, nGL patterns are designed as n-ary gray-code (nGC) patterns to ensure that at most, one code changes at each point. Experiments verify the robustness and effectiveness of the proposed method to measure isolated objects with complex surfaces." @default.
- W2765328538 created "2017-11-10" @default.
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- W2765328538 date "2017-10-19" @default.
- W2765328538 modified "2023-10-14" @default.
- W2765328538 title "Modified Gray-Level Coding Method for Absolute Phase Retrieval" @default.
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- W2765328538 doi "https://doi.org/10.3390/s17102383" @default.
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