opencv轮廓检测——绘制物体的凸包

1、绘制轮廓：import cv2img = cv2.坡纠课柩imread('0.png')img0=cv2.c即枢潋雳vtColor(255-img,cv2.COLOR_BGR2GRAY)_, t = cv2.threshold(img0, 0, 255, cv2.THRESH_BINARY)_, c, _ = cv2.findContours(t, 3, 2)for cnt in c: cv2.drawContours(img,c,-1,(255,0,0),2)cv2.imwrite('00.png',img)255-img是为了取反色图片。

3、第二个物体的凸包是：hull = cv2.convexHull(c[1])

5、用for循环，来画出所有物体的凸包：for cnt in c: hull = cv2.convexHull(cnt) cv2.polylines(img,[hull],True,(500,255,0),2)