如何使用 python 中的 opencv 检测图像中的垂直边缘

Question

I want to detect joints in a sugarcane stick and do not want the border lines to be detected this is my original Original Image , and after applying Morphological Gradient I got this output image . The desired output that I need is to detect only vertical edges that is the joints, the desired output are only the red lines in this image .

So, it would be great if anyone could help me out!

Answer 1

You can try to enhance the following code to find vertical edges as you need

img = cv2.imread("edges.png")
mask = img[:,:,0]

height, width = mask.shape

mask = cv2.threshold(mask, 100, 255, cv2.THRESH_BINARY)[1]
#cv2.imshow("mask", mask)

vertical_kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (1, height//30))
vertical_lines = cv2.erode(mask, vertical_kernel, iterations=1)
vertical_lines = cv2.dilate(vertical_lines, vertical_kernel, iterations=1)

#cv2.imshow("vertical_lines", vertical_lines)

img[vertical_lines > 0, 2] = 255
cv2.imshow("img", img)
cv2.waitKey(0)