The processing course is designed by the following operations sequence: Image preprocessing -> Tank region segmentation -> Reticle region segmentation -> Tank's barycenter extraction -> Reticle's center extraction->Error calculation.
then another appropriate threshold is used to obtain the connectivity region of tank and reticle ,after subtract tank region , obtain reticle region and calculate its center coordinate . Using these center points coordinate data we can calculate the error results.
In order to measure the three-light-axis parallelity of laser telemeter, we use CCD to get laser spot image and then capture and process the image to calculate the position error between the center of white light cross line and that of the spot and explain selected image processing arithmetics.