Identification method of circular seal based on adaptive rotation and approximation

Circular seal identification based on template matching, as a classic algorithm, has two own shortcomings. The first is that it is invalid to seal with rotation angle. The second is that the algorithm is complex. In view of this two shortcomings, the seal identification based on adaptive rotation and approximation is proposed. To solve the first question, circular seal is recognized by matching between the template adaptively rotating about central point and test seal. To solve the next question, the correlation between template and test seal is obtained by calculating the correlation of Boolean of their binary image. Experimental results show that the new algorithm effectively solve the two shortcomings of seal identification based on template matching.