On Fusing Multiple Needle Maps for Recovering 3-D Absolute Depth
关于融合多针图确定物体三维表面绝对深度的研究

The photometric stereo system can easily determine the surface orientation and relative depth of an object, but can not determine absolute depth. In order to determine absolute depth, this paper proposes an algorithm which obtains a pair of the needle maps between the corresponding areas in the two needle maps by binocular photometric stereo system, solves disparities between the corresponding areas in the two needle maps first and then fuses disparities correctly and match them accurately, finaly reconstructs 3 - D depth of the object surface. This method is very useful for as to conduct research on 3 - D surface depth reconstruction and to recover scene structure.