Digital fringe projection-based three-dimensional measurement fringe principal value phase extraction method

• Main Authors: YU MIN, YU RENMING, ZHU GUILONG, YAO JUN, HAN DEBIN, WU XIAOCHUN
• Format: Patent
• Language: Chinese; English
• Published: 12.04.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

The invention relates to the technical field of optical three-dimensional measurement, in particular to a digital fringe projection-based three-dimensional measurement fringe principal value phase extraction method, which comprises the following steps of: S1, designing four groups of phase shift fringe image sequences and generating corresponding pictures by using a computer; s2, sequentially projecting the pictures generated in the step S1 to the surface of a measured object by using a digital projector, and synchronously acquiring a stripe image sequence modulated on the surface of the object, and S3, extracting a principal value phase from the sixteen frames of deformed stripe images in the step S2. The phase principal value extraction error caused by the gamma effect of the digital projector can be effectively reduced. 本发明涉及光学三维测量技术领域，尤其涉及一种基于数字条纹投影三维测量条纹主值相位提取方法，包括S1、设计四组相移条纹图像序列并用计算机生成对应的图片；S2、利用数字投影仪将S1中生成的图片依次投影到被测物体表面，并同步采集物体表面调制的条纹图像序列，S3、对步骤S2的十六帧变形条纹图像提取主值相位。本发明可以有效减小由于数字投影仪伽马效应引起的相位主值提取误差。