The establishment of correspondence between two images is the precondition for 3D reconstruction in computer vision. By comparing several commonly used stereo matching methods

a highly effective stereo matching method

which is a combination of several matching methods

is proposed as a solution to the existing problem as detailed below: a series of gratings constructed by computer for phase demodulation is projected onto the object

and a series of black and white coded gratings constructed by computer is then projected onto the object

the distorted grating images are collected into the computer by CCD

the primary value of phase folded in zone is obtained through phase demodulation using the phase demodulation gratings

the period of phase is obtained through phase demodulation using structured light coding proposed

the true phase value is obtained by adding the two

the points with the same phase are fitted into a continuous cure by interpolation to realize the matching between two CCD images with the same curves

and the matching between the corresponding points in two images is obtained according to the epipolar constraint conditions. Experimental results proved the correctness and effectiveness of the method proposed.