Fig. 1. Schematic of deflectometry measurement method of single-camera monitoring

Fig. 2. Schematic of calibration. (a) Mirror calibration method; (b) rigid transformation of coordinate system

Fig. 3. Deflectometry measurement system of single-monitoring

Fig. 4. Calibration of the positions of two cameras. (a), (b) and (c) are the fringe patterns from LCD captured by camera 1 through mirror reflection at three different positions; (d) is the fringe pattern from LCD captured by camera 2. The images in the red box represent the absolute phases

Fig. 5. Simulation of the radial basis function. (a) Gradient in x direction; (b) gradient in y direction; (c) surface calculated from gradient data by the radial basis function interpolation; (d) simulated surface height error

Fig. 6. (a) RMS error and (b) maximum error after introducing Gaussian noises in the simulation

Fig. 7. Absolute phases of phase shifting fringes of camera 1 and camera 2. (a) and (b) are the absolute phases of LCD at two positions captured by camera 1; (c) and (d) are the absolute phases of LCD at two positions captured by camera 2

Fig. 8. Mirror surface calculation results. (a) Gradient in x direction; (b) gradient in y direction; (c) gradient error in x direction; (d) gradient error in y direction; (e) surface calculation from gradient data by the radial basis function interpolation; (f) surface height error