Abstract
This paper proposes a method to detect rectangular objects that have free sizes, aspect ratios, locations and inclinations in a scene image. The positions of candidates for vertexes of rectangular objects are measured by the combinational Hough transform that uses the geometrical features of a pair of edge pixels. Each rectangular object is detected by evaluating the geometrical relations between the candidates for vertexes. The experimental results show that various rectangular objects with free sizes and free poses were detected successfully in gray-scaled images by the proposed method. The proposed method is supposed to be useful for practical applications because it has good reliability without large computational cost.
