Defocused projection three-dimensional measuring method based on colorful triangular wave fringes

• Main Authors: CHAI MINGGANG, FU YANJUN, XIA GUISUO, WANG FENGLI
• Format: Patent
• Language: Chinese; English
• Published: 12.10.2016
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

The invention discloses a defocused projection three-dimensional measuring method based on colorful triangular wave fringes. The method includes four key parts including the colorful triangular wave fringe encoding principle, a defocused projection system, the principle of eliminating color crosstalk between channels and the three-dimensional measuring principle. The method has the advantages that compared with a traditional fringe projection method needing to project three frames of fringes (phase shift of each frame is 120 degrees), only one frame of colorful triangular wave fringes needs to be projected in the method, and three-dimensional measuring speed is greatly increased; the triangular wave fringes are subjected to slight defocused projection, and ideal sine fringes can be obtained on a reference plane; the colorful triangular wave fringe defocusing method is adopted, so high-order harmonics can be filtered out, the gamma effect can be reduced, and accordingly measuring precision is further improved.