关键词: 道路交通标志, 改进HSI颜色空间, 不变矩, 欧式距离分类器

Abstract: An improved method of color image segmentation in HSI color coordinate system is presented in this paper.This method combined with the theory of invariant moments is also used for the detection of prohibitory signs in Color Images.First，images are preprocessed，including RGB color coordinate system being transformed into HSI color coordinate system or the improved HSI color coordinate system and then morphological filters being employed.After that，all the closed regions in the image should be signed with different figures and the area of the region which is less than a threshold of the area should be wipe off.The region of which the area is bigger than the threshold should be retained.hu’s invariant moments of every region are calculated and 7 eigenvalues of every region can be obtained.These eigenvalues should be compared with the orthonormal circular and triangular eigenvalues which are prepared in advance.A euclid-distance classifier is designed for comparing.Experimental results show that the prohibitory signs can be detected quickly and exactly in this method.

Key words: road sign detection, improved HSI color coordinate system, invariant moments, euclid-distance classifier