Method for measuring the parallax between stereo images by carrying out a stereo correspondence search between pairs of images, has the following steps: setting of a special region of a base window in a base image; setting of a reference window of the same size in a reference image and; evaluation of the difference between reference and base windows by sampling the reference window along an epipolar line. Parallax and a parallax reliability factor are determined and output based on evaluation of differences between matching points in base and reference windows. Independent claims are also included for the following:- (a) a stereo image processing device and; (b) a program for processing stereo images for controlling a stereo image processing device for measuring parallax by carrying out a stereo correspondence search.
Stereo image processing method for measuring parallax between stereo images to determine 3D position coordinates of image objects, wherein both parallax and a parallax reliability factor are determined