Phase-map fringe pixel tracing for height computation

Abstract

Fringe projection coupled with phase map generation has been used extensively for various applications namely in quality control sector of the industrial field. A phase map is generated from a multiple fringe projected images. Many algorithms have been generated for this purpose. Here a simple three step phase-shifting is used to project the fringes and finally from these images a saw tooth fringe of a phase map is produced. Deformed area of the phase map is re-traced to its matching pixel which has been translated to a designated point due to height differences. This re-traced distance value relates to the height difference occurring of the deformed area. The experimental work done by V. Retnasamy & M.M Ratnam (2008) is further investigated for the total area rather than respective points in a computer simulated images. Multiple and various shapes of computer simulated images have been investigated for height computation.