Adaptive horizontal scaling method for speckle- assisted fringe projection profilometry

Phase-shifting method is widely used in fringe projection profilometry to obtain high-precision wrapped phase maps. The wrapped phase map needs to be converted to an absolute phase map to recover 3D information. The speckle pattern based phase unwrapping method requires only one additional auxiliary pattern, showing great potential for fast 3D measurements. In this paper, a speckle assisted four-steps phase-shifting method was proposed for 3D measurements. This method requires five structured light patterns to complete 3D measurements, including four-steps phase-shifting fringe patterns and a speckle pattern which is used to remove phase ambiguity. The main challenge of speckle based phase unwrapping method is to overcome the mismatch problem which often occurs in some very steep surfaces. In order to improve the speckle matching accuracy, an adaptive horizontal scaling method was proposed. A voting strategy based on phase-connected regions was proposed to reduce the computational overhead. The experiments demonstrate its superior performance, and an accuracy of 0.21 mm was achieved. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

A speckle-assisted four-steps phase-shifting method is proposed for 3D measurements. Five structured light patterns, including four-steps phase-shifting fringe patterns and a speckle pattern, are used to complete the measurements and remove phase ambiguity. An adaptive horizontal scaling method is introduced to improve the speckle matching accuracy, and a voting strategy based on phase-connected regions is proposed to reduce computational overhead. Experimental results demonstrate superior performance with an accuracy of 0.21 mm.