Gray fringe pattern design method for three-dimensional measurement

• Main Authors: LIU YINPING, LIU JIA, WU DI, QI JIAN, LU CHANGQIU, WEN JIE, YAN FEI, XIAO YUQIAN, YU QIANG
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

The invention discloses a gray fringe pattern design method for three-dimensional measurement, which comprises the following steps of: coding more than two black and white binary fringes by referring to a gray fringe pattern for actual three-dimensional measurement, such as sine Gray codes and the like, so that a pattern formed by the coded individual black and white fringes participating in a series of operations is consistent with a reference pattern. The adopted binary fringes are not influenced by nonlinearity, so that the projection equipment does not need to be subjected to nonlinear correction in advance. Compared with a traditional stripe measurement method, defocusing operation is not needed in the process of constructing gray stripes by using black and white stripes, equipment does not need to have a defocusing function, and hardware limitation is small; the influence of reducing the stripe contrast and aggravating stripe edge jump during phase solution is avoided; and the number of coding fringe pa