我试图在此图像上绘制具有不同颜色的轮廓( https://docs.opencv.org/3.4.0/d4/d73/tutorial_py_contours_begin.html )，但轮廓始终是白色的。下面是代码
import cv2
import numpy as np
img = cv2.imread(r'C:\Users\Ron Shporer\Desktop\TESTSAVES\TESTLines.png',0)
ret,thresh = cv2.threshold(img,127,255,0)
im2,contours,hierarchy = cv2.findContours(thresh, 1, 2)
cnt = contours[0]
cv2.drawContours(img, contours, -1, (255,0,0), 5)
cv2.namedWindow('img', cv2.WINDOW_NORMAL)
cv2.imshow('img',img)
cv2.waitKey(0)
cv2.destroyAllWindows()`
如下图:
最佳答案
解决办法很简单。您可以将输入图像转换为 3 channel 图像，然后在转换后的彩色图像上绘制轮廓。
代码如下:
import cv2
import numpy as np
img = cv2.imread(r'C:\Users\Ron Shporer\Desktop\TESTSAVES\TESTLines.png',0)
ret,thresh = cv2.threshold(img,127,255,0)
im2,contours,hierarchy = cv2.findContours(thresh, 1, 2)
cnt = contours[0]
result_img = cv2.cvtColor(frame, cv2.COLOR_GRAY2RGB)
cv2.drawContours(result_img, contours, -1, (255,0,0), 5)
cv2.namedWindow('img', cv2.WINDOW_NORMAL)
cv2.imshow('img', result_img)
cv2.waitKey(0)
cv2.destroyAllWindows()
关于python - 如何在 OpenCV/python 上更改轮廓颜色，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51560541/