Theory analyses of moiré stripe in 3-D profilometry measurement

The principle of moire stripe with projection moire method was analyzed in detail, and the formula of moire stripe was deduced. The moire stripes of familiar objects were simulated by computer, and the conclusions are consistent with the results of the famous experiment. The moire stripes of object with the same shape but the different size were compared, and the moire stripes of object with different shape were compared, too. According to the theory picture of projection moire method,the moire stripe of spherical surface was gotten, which is consistent with result of simulation. The moire stripe was filtered and thinned. The clear thinned stripes were obtained after a series of image processing. Then according to the formula of the rank of moire stripe and the height, the 3-D profilometry of the sphere was reconstructed.