Complex object 3D measurement based on phase-shifting and a neural network

Measurement of the Cam Spacing on Camshaft by Binocular Vision

“…The system accuracy is improved considering the nonlinear measurement error. An accurate phase-height mapping algorithm is proposed by Z. W. Li [6] to improve the performance of the structured light system with digital fringe projection. By means of a training network, the relationship between the 2D image coordinates and the 3D object coordinates can be achieved.…”

Gamma Correction and Absolute Coordinate Residual Compensation for Triangular Patterns Phase Shifting Profilometry

“…Compared to other methods, PSP has the advantage of high resolution, high measurement speed; less sensitive to the surface reflectivity variations and the object can be measured point by point [3].…”

High precision 3D measurement using area modulated phase-shifting binary patterns

“…Compared with other 3D shape measurement methods, the multi-frequency heterodyne phase shift method is one of the most widely adopted technologies, which has the advantages of high accuracy and fast measurement speed [1,2]. However, it is very difficult to generate perfect sinusoidal fringe pattern with the commercial projector due to the effect of the nonlinear gamma.…”