to provide for extracting image feature extraction device features boundary lines are included in the ambiguous image. An extracting image feature extracting unit 106 features contained in the image, extracting the frequency component extracting means 106a spatial frequency components of the local, and extracts the orientation component of local based on the spatial frequency component of the local of the image and an extract curvature feature extraction means 106d features about the curve of the local on the basis of the orientation component extraction unit 106b, the orientation component of the local. Characterized on the curve, for example, there is the direction of the curve and the magnitude of the curvature.
展开▼
