The matching result is very easy to be wrong due to the uncertainty of searching scope on disparity during stereo matching.A novel stereo matching algorithm is developed

whose criterion is the minimum of absolute disparity combined with gray correlation multi-peak value method.It is pointed out that the corresponding point with maximum of gray normalized correlation coefficient is not the correct matching point completely by analyzing maximum of gray normalized correlation coefficient matching approach

so gray correlation multi-peak value matching method is mentioned to obtain initial matching aggregation in the paper.Disparity gradient restriction is used to optimize the initial matching aggregation partially.The method

whose criterion is the minimum of absolute disparity

is used to ascertain the only matching point.It is proved that the algorithm proposed in the paper is feasible by 3D reconstruction on an object (deflection yoke

DY)with complex and irregular surface

and a standard piece with given 3D coordinates

which can meet the demands for measuring in non-contact the 3D coordinates of object

such as DY

with irregular surface precisely.