Improved Three-Frequency Four-Step Phase-Shifted Surface Structured Light 3D Reconstruction Algorithm
To solve the problem that the traditional three-frequency four-step phase-shift algorithm has too many projection images and low efficiency,an improved three-frequency four-step phase-shift planar struc-tured light reconstruction algorithm is proposed.The improved algorithm requires three sinusoidal fringe patterns of high frequency,but the number of fringe patterns required for projection is reduced from 12 to 7 in the traditional algorithm,4 fringe patterns of the highest frequency,2 fringe patterns of the sub-high fre-quency and 1 fringe patterns of the lowest frequency,respectively,and the projection efficiency is increased by 41.7%compared with the traditional algorithm.The principle of the improved algorithm is introduced.The enveloping phase calculated by the four highest frequency graphs is used for 3D reconstruction,and the enveloping phase calculated by the other two frequency fringe graphs is used for phase unwrapping.Final-ly,the algorithm′s reconstruction accuracy and 3D reconstruction ability of complex surface objects are ver-ified by experiments.The experimental results show that the improved surface structured light algorithm can improve the projection efficiency and maintain the same accuracy as the traditional algorithm.
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