opencv轮廓检测

https://blog.csdn.net/A632189007/article/details/78126588

import cv2

# 读取图片

img = cv2.imread("PM.png")

# 转灰度图片

gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

ret, binary = cv2.threshold(gray,127,255,cv2.THRESH_BINARY)

# 轮廓检测

_ ,contours, hierarchy = cv2.findContours(binary, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)

# 新打开一个图片，我这里这张图片是一张纯白图片

newImg = cv2.imread("aaa.png")

newImg = cv2.resize(newImg, (800,800))

# 画图

cv2.drawContours(newImg, contours, -1, (0,0,0), 3)

# 展示 cv2.imshow("img", newImg) cv2.waitKey(0)