摘要
Abstract
Most of the encoding and decoding methods used in the traditional structured light 3D imaging measurement tech-nology are two-gray-level gray code symmetrically combined with sinusoidal phase shift,that is,the minimum encoding period of the gray code is set equal to the phase shift period,and this method needs to project multiple gray code pattern,and the periodic dis-location error is prone to occur at the periodic boundary,which reduces the accuracy of the three-dimensional measurement.In or-der to fundamentally solve this problem and improve the accuracy of 3D imaging technology,an improved coding method is pro-posed,which is a four-gray-level gray code asymmetry combined with a four-step phase shift structured light coding and decoding imaging measurement method.The minimum coding period of the gray code is not the same as the phase shift period.The minimum coding period of the gray code with four gray levels is set to be half of the period of the four-step sinusoidal phase shift.The absolute phase value and the 3D coordinates of the object are obtained according to the calibration results and the principle of triangulation,thus complete the entire 3D imaging process.The 3dmax simulation test results and physical test results show that compared with the traditional two-gray-level gray code-phase shift technology,the use of four-gray-level gray code reduces the number of projected patterns and has anti-interference ability,asymmetrical the combined codec technology effectively eliminates the period disloca-tion,and the measurement accuracy is greatly improved.关键词
结构光/三维成像/编解码模式/四灰度格雷码/四步相移/非对称结合/相位展开Key words
structured light/three-dimensional imaging/codec mode/four-gray gray code/four-step phase shift/asym-metric combining/phase unwrapping分类
信息技术与安全科学
