python - 如何获得直线上的曲线点？

Question

我想检测线上的所有角点和起点、终点。我可以检测到起点和终点，但无法检测到曲线。这是我的代码

from scipy.ndimage import generic_filter

def lineEnds(P):
    return 255 * ((P[4]==255) and np.sum(P)==510)

 image = cv2.imread("./dataset/test.jpg" , cv2.COLOR_RGB2GRAY)
 result = generic_filter(image , lineEnds, (3, 3))

图像 =

结果 =

Answer 1

您也可以使用 OpenCV 检测角点

import cv2

image = cv2.imread('./test.jpg')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
# Detect corners in the image
corners = cv2.goodFeaturesToTrack(gray, 500, qualityLevel=0.01, minDistance=20)

for c in corners:
    x, y = c.reshape(2)
    print(x, y)
    # draw a circle around the detected corner
    cv2.circle(image, (x, y), radius=4, color=(0, 255, 120), thickness=2)

cv2.imshow("Result", image)
cv2.waitKey(0)

结果:

有关更多详细信息，请查看这些文档:

Shi-Tomasi Corner Detector

Harris Corner Detection