3-D SENSING USING LASER SHEET PROJECTION - INFLUENCE OF SPECKLE

In laser triangulation, the determination of the centroid is limited b y the image speckle. In this article we present a new method to reduce image speckle. We find the correlation function of image speckle decr eases with the change of illumination angle, so for a static object ar e 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 cam era. An analytical description is presented and is experimentally veri fied.