I. Introduction
Image registration for object detection is very important technique in practical applications. Recently, feature-based matching algorithms such as SIFT[1] or SURF[2] have been studied and good applications have been also reported [3]. Certainly they are effective methods especially when objects have a lot of feature points called ‘keypoints’. However, pixel-based matching algorithms such as template matching[4] have been frequently utilized in actual situations, because the algorithm is very simple and easy to implement. Moreover it can be used not only when objects have much texture but also have few textures.