摘要
特征点(角点、拐点、切点)只反映轮廓曲线的部分信息,为更精确地描述曲线,定义和提取一种特征点——弦高点,基于该特征点构造一种曲线局部描述符,并将其用于曲线匹配.定义的弦高点比现有的特征点更精确描述曲线的特性,能解决轮廓曲线平滑特征点少而不能被精确描述的问题.文中定义的弦高点和构造的识别向量都具有仿射不变性,且均为局部描述符,因而文中方法适合于仿射变换且在遮挡的情况下仍有效.理论分析和实验结果都证明该方法的有效性.
The traditional feature points only reflect some information of the contour curve. To describe the curve more accurately, a kind of feature points, nameed chord height point, is defined and extracted. Based on the feature points, a local curve descriptor is constructed to match the contour curves. Chord height point is sampled from each sub-curve and it can be employed to describe the curve more precisely than the common feature points such as corners, points of tangency and inflection points. It can solve the problem that the curve can not be described precisely, because the smooth curve has fewer feature points. The defined chord height points and the constructed recognition vector are local descriptors with invariance under affine transformation, so the matching method is robust under occlusion and affine transformation. The theory analysis and experimental results show that the proposed algorithm is effective.
出处
《模式识别与人工智能》
EI
CSCD
北大核心
2012年第6期972-978,共7页
Pattern Recognition and Artificial Intelligence
基金
国家自然科学基金项目(No.61063030)
江西省自然科学基金项目(No.2010GZS0168)
江西省科技支撑计划项目(No.2009BGA00800)
江西省教育厅科技项目(No.GJJ11512)资助
关键词
仿射不变性
局部描述符
弦高点
Affine Invariance, Local Descriptor, Chord Height Point
