With the improvement of substation intelligence,automatic meter reading has become the future development trend.Pointer meter images are vulnerable to illumination,complicated background of panel,low contrast and substation itself.Aimed at this problem,a new algorithm for the reading recognition of substation pointer meter based on Hough subtraction is proposed.The proposed approach extracted the circle of meter region by Hough circle detection algorithm based on gradient.The pointer was positioned by image subtraction and the template matching method was adopted to extract panel characteristic scale value.The reading recognition was identified by the relation between the pointer and scale lines.Experimental results show that the proposed method is smaller effected by complicated background.It has batter recognition accuracy.
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