Efficient color correction approach for phase unwrapping based on color-encoded digital fringe projection

A highly efficient color correction approach based on color-encoded fringe projection is proposed, which combine color image segmentation and color intensity interpolation technique. Only 24 designed color patterns are projected and recorded to implement the process with a high brightness DLP projector and a color camera. To establish the correspondence between the designed color intensity and recorded color intensity, the recorded image is firstly segmented into some adjacent grid region by neighboring pixel intensity fitting error, the grid region is then grown to the region boundary employing some process algorithm, thirdly, the region number is labeled and adjusted based on the designed color pattern by searching the region centre coordinate and applying a man-machine conversation method, finally, the color correspondence relation is established according to the designed color pattern pixel index and the labeled grid region number of recorded image. While doing the color correction, firstly, the initial color intensity is searched according to the minimum color distance between the recorded color and designed color. Secondly, color interpolation is implemented to obtain the true color intensity correspondence to recorded color. The proposed approach validity is testified by experiment results.