路标识别，模式识别大作业，圆形检测；检测彩色路标，直方图均衡化，提取圆形路标，增强提取目标，二值化,提取路标中的指示图，中值滤波，平滑滤波，图像边框处理，链码生成及识别(The road sign recognition, pattern recognition operations, circle detection; detection of color signs, histogram equalization, extracting circular signs, enhanced extraction of the target, binarization, map and extract landmarks in median filtering, image smoothing, fr a me processing, chain code generation and recognition)