基于opencv的滤波、反色、边缘检测、形状匹配。(Opencv filtering, edge detection, color and shape matching based on.)

形状是由图像的轮廓形成的，所以理论上形状识别是通常在边缘或轮廓检测后的步骤。(edge_based_matching The shape is formed by the outline of the image, so theoretically the shape recognition is usually the step after the edge or contour detection)