Point-pair Match Based Registration Algorithm for PCB CT Images

Aiming at the problem that it is impossible to effectively registration PCB CT images that contain many similar regions,an algorithm is proposed based on point-pair match.We first generate the point-pairs from adjacent points and describe them using the simplified method of a fast low-dimensional descriptor called KPB-SIFT,then reduce mismatches by means of the prescriptive point-to-point directions and classification match.Finally a mismatch resistant algorithm is developed to pick up the correct match points based on an error constraint of matched point direction.Experimental results show that the algorithm maintains a low time complexity and keeps a high correct match ratio of 95.58%.It can effectively solve the registration problem of PCB CT image by extracting correct matches which are uniformly distributed.