Abstract
A new 3-D measurement method is proposed. We use the measurement of deformation of the projected grid pattern on an object. The three level grid is coded by a pseudorandom M-sequence to make it easy to identify the position on the object. We also use the gray image obtained by the projection of uniform light onto the object to normalize the gray level of the grid detected by a TV camera. The coordinates of the object points on the grid are calculated by triangulation based on the decoding of the M-sequence. This method has an advantage that only two images obtained by two projections are required. Experimental results show that the decoding is not influenced by the color and/or the reflectance of the object.
