大部分的图像存在遮挡现象,因此只能获得对象的部分轮廓。曲率尺度空间描述子(Curvature scale space descriptor,CSSD)是MPEG-7标准采用的闭合轮廓描述子。本文研究并分析了闭合完整轮廓和部分开轮廓曲线演化过程的不同之处,提出了一...大部分的图像存在遮挡现象,因此只能获得对象的部分轮廓。曲率尺度空间描述子(Curvature scale space descriptor,CSSD)是MPEG-7标准采用的闭合轮廓描述子。本文研究并分析了闭合完整轮廓和部分开轮廓曲线演化过程的不同之处,提出了一种通用曲率尺度空间描述子(GCSSD),不仅继承了CSSD的旋转、尺度、平移不变性及抗噪能力,并较好地描述部分开轮廓的特征。本文也给出相应GCSSD的匹配算法,将其应用于彩色图像花的检索,实验结果表明其性能明显优于CSSD。展开更多
The mean Hausdorff distance, though highly applicable in image registration, does not work well on partial matching images. An improvement upon traditional Hausdorff-distance-based image registration method is propose...The mean Hausdorff distance, though highly applicable in image registration, does not work well on partial matching images. An improvement upon traditional Hausdorff-distance-based image registration method is proposed, which consists of the following two aspects. One is to estimate transformation parameters between two images from the distributions of geometric property differences instead of establishing explicit feature correspondences. This procedure is treated as the pre-registration. The other aspect is that mean Hausdorff distance computation is replaced with the analysis of the second difference of generalized Hausdorff distance so as to eliminate the redundant points. Experimental results show that our registration method outperforms the method based on mean Hausdorff distance. The registration errors are noticeably reduced in the partial matching images.展开更多
文摘大部分的图像存在遮挡现象,因此只能获得对象的部分轮廓。曲率尺度空间描述子(Curvature scale space descriptor,CSSD)是MPEG-7标准采用的闭合轮廓描述子。本文研究并分析了闭合完整轮廓和部分开轮廓曲线演化过程的不同之处,提出了一种通用曲率尺度空间描述子(GCSSD),不仅继承了CSSD的旋转、尺度、平移不变性及抗噪能力,并较好地描述部分开轮廓的特征。本文也给出相应GCSSD的匹配算法,将其应用于彩色图像花的检索,实验结果表明其性能明显优于CSSD。
基金Project(61070090)supported by the National Natural Science Foundation of ChinaProject(2012J4300030)supported by the GuangzhouScience and Technology Support Key Projects,China
文摘The mean Hausdorff distance, though highly applicable in image registration, does not work well on partial matching images. An improvement upon traditional Hausdorff-distance-based image registration method is proposed, which consists of the following two aspects. One is to estimate transformation parameters between two images from the distributions of geometric property differences instead of establishing explicit feature correspondences. This procedure is treated as the pre-registration. The other aspect is that mean Hausdorff distance computation is replaced with the analysis of the second difference of generalized Hausdorff distance so as to eliminate the redundant points. Experimental results show that our registration method outperforms the method based on mean Hausdorff distance. The registration errors are noticeably reduced in the partial matching images.