Abstract:

This article deals with the application of digital image processing in image measurement. The possibility of automatic processing and measurement of digital fringe linage has been discussed and a new method for the fringe order determination has been proposed. The fringe order counting processing is a key step in automatic digital fringe image measurement. In a time-mean laser holographic interfcrometry fringe image, the gray level is the square of the first zero order Bessel function, according to which the gray level in one set of fringes declines with the increase of fringe order. From the gray relationship between fringes and the characteristics of fringe distribution, the fringe orders can be recognized automatically with computer program. An efficient algorithm for fringe order counting has been used successfully in the auto-mattic digital fringe image processing for holographic interferometry.

Key words: holographic interferometry, image measurement, digital image processing