For the detection of sign each frame is analysed. First the image is Converted into gray scale image and then threshold is performed. Then by using blob analysis portion of red part is extracted. Then this extracted part is compared with each t

使用FLANN(近似最近邻算法)实现图像特征的匹配，其中图像特征使用SIFT提取，算法能实现单应性匹配需求。- FLANN (approximate nearest neighbor algorithm) is used to match the image feature, and the image feature is extracted using SIFT. The algorithm can achieve the homography matching requirement.