python 霍夫直线检测

霍夫变换是一种在图像处理中用于检测任何形状的技术，其中最常见的应用是检测直线。下面是Python中使用OpenCV库实现霍夫直线检测的步骤：

1. 导入必要的库和读取图像

import cv2
import numpy as np

img = cv2.imread('image.jpg')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray,50,150,apertureSize = 3)

2. 进行霍夫变换

lines = cv2.HoughLines(edges,1,np.pi/180,200)

3. 绘制检测到的直线

for line in lines:
    rho,theta = line[0]
    a = np.cos(theta)
    b = np.sin(theta)
    x0 = a*rho
    y0 = b*rho
    x1 = int(x0 + 1000*(-b))
    y1 = int(y0 + 1000*(a))
    x2 = int(x0 - 1000*(-b))
    y2 = int(y0 - 1000*(a))
    cv2.line(img,(x1,y1),(x2,y2),(0,0,255),2)

4. 显示结果

cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()