Jie-Lin LI, Xian-Yu SU and Wen-Shen ZHOU

Opto-electronics Department, Sichuan University, Chengdu, 610064, P. R. China

(Accepted December 7, 1994)

In laser triangulation, the determination of the centroid is limited by the image speckle. In this article we present a new method to reduce image speckle. We find the correlation function of image speckle decreases with the change of illumination angle, so for a static object we scan the incident angle within the plane of the light sheet and get a speckle-reduced image, with the time-integration effect of a CCD camera. An analytical description is presented and is experimentally verified.

Key words : image speckle, laser triangulation