Fig. 1. Schematic diagram of monocular measurement system

Fig. 2. Response curve of projector-camera

Fig. 3. Schematic diagram of modification principle of projection grating. (a) Object to be tested; (b) standard sinusoidal fringe and intensity curve of its 300th line; (c) deformed fringe image captured by standard sinusoidal fringe projection and intensity curve of its 600th line; (d) projector-camera response curve at projection grating point (300,900); (e) projection grating with non-equivalent coefficients and intensity curve of its 300th line; (f) deformed fringe image captured after projecting grating with non-equivalent coefficients and intensity curve of its 600th line

Fig. 4. Schematic diagram of camera and projector pixel matching

Fig. 5. Experimental system. (a) Experimental devices; (b) image captured by camera when projection grayscale is 0, 80, 160, 255, respectively

Fig. 6. Generation of projection grating with non-equivalent coefficients. (a) Projection range matrix and minimum projection gray matrix of camera; (b) projection range matrix and minimum projection gray matrix of projector; (c) generated projection grating with non-equivalent coefficients

Fig. 7. Comparison of measurement results of metal disk between traditional method and proposed method. (a) Comparison of deformed fringe images; (b) comparison of unwrapping phases

Fig. 8. Measurement results of metal disk. (a) Standard CAD data; (b) point cloud data obtained by traditional method; (c) point cloud data obtained by proposed method; (d) standard CAD data displayed in Geomagic; (e) data measured by traditional method displayed in Geomagic; (f) data measured by proposed method displayed in Geomagic; (g) height comparison of one row of three sets of data; (h) standard deviation between data obtained by proposed method and Geomagic fitting plane

Fig. 9. Measurement results of cylindrical metal part with hole. (a) Object to be tested; (b) standard data; (c) standard data displayed in Geomagic; (d) deformed fringe image captured by traditional method; (e) data obtained by traditional method; (f) result obtained by traditional method displayed in Geomagic; (g) deformed fringe image captured by proposed method; (h) data obtained by proposed method; (i) result obtained by proposed method displayed in Geomagic; (j) height comparison of one row of three sets of data; (k) standard deviation between data obtained by proposed method and Geomagic fitting cylindrical surface