关键词: 轮廓角点, 主轴, 旋转与尺度不变性, 多目标识别, 旋转角度

Abstract: The contour corner detection and feature construction are the key technology in Rotation and Scale Invariant（RSI） target recognition based on contour corner. Aiming at the insufficiency of the existing corner detection in precision and anti-noise capacity, this paper presents an improved contour corner detection method, and constructs a characteristic string based on target’s principal axis and contour corners, using the dynamic programming algorithm to identify the target. In this algorithm, the rotation angle of the principal axis of target is regarded as the angle of target’s attitude to calculate. Experiments prove that this algorithm can rapidly identify the rotation angle of the target, and classify the target. The algorithm also has translation invariance, rotation and scale invariance and well anti-noise capacity.

Key words: contour corner, principal axis, rotation and scale invariant, multi-target recognition, rotation angle