python实现opencv学习十八：直线检测

代码如下：

# -*- coding=GBK -*-
import cv2 as cv
import numpy as np

#霍夫直线检测
def line_image(image):
    gray = cv.cvtColor(image, cv.COLOR_BGR2GRAY)
    edges = cv.Canny(gray, 50, 150, apertureSize=3)
    lines = cv.HoughLines(edges, 1, np.pi/180, 200)
    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))
        cv.line(image, (x1, y1), (x2, y2), (0, 0, 255), 2)
    cv.imshow("直线", image)


src = cv.imread("C://01.png")
cv.imshow("原来", src)
line_image(src)
cv.waitKey(0)
cv.destroyAllWindows()

运行结果：