High-speed surface profilometer based on a spatial light modulator and pipeline image processor

Specular surface measurement by using a moving diffusive structured light source

“…The impacts of harmonics in the fringe patterns induced by the nonlinearity of the planar monitor can be effectively eliminated by increasing the number of phase shifts 42,43 . The nonlinearity of the planar monitor can also be compensated for via implementation of photometric calibration 44,45 or Gamma correction 46 . From Eqs.…”

Some practical considerations in fringe projection profilometry

“…2, to automatically determine the unwrapped full-field phase distributions from the wrapped ones in a fast manner. At present, a few similar multi-frequency fringe schemes have been developed, including the so-called temporal unwrapping and hierarchical unwrapping [23][24][25][26][27][28][29][30]. These schemes typically use a series of fringes with specific pre-defined frequencies to achieve full-field phase unwrapping.…”

Combining digital image correlation and projected fringe techniques on a multi-camera multi-projector platform

“…In this way, surfaces with complex geometries and discontinuities can be measured as easily as simple ones. The authors have given details of the measurement algorithm in reference [8] with further information about the calibration method in reference [1].…”