Abstract
The template matching is a method to search a target image area that is similar to a template image. However, the target image area must have the right position as the template image generally. Therefore it requires large computational cost when a location and an inclination of the target image area are unknown. This paper proposes a method to search a target image area that has a free location and a free inclination by geometrical parameters obtained by equidistantly edge group. In this method, the difference of directions is calculated by the edge direction of a referenced edge pixel and by the directions from the referenced edge pixel to other selected edge pixels. After that, the matching process is performed by using the difference of directions and matching rates are accumulated. Then the location and inclination of the target image area are searched by scanning the accumulation space. The experimental results show that the proposed method had higher reliability and less computational cost for image matching.
