正文
14、OpenCV Python 直线检测
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__author__ = "WSX"
import cv2 as cv
import numpy as np
#-----------------霍夫变换---------------------
#前提条件： 边缘检测完成
def line_detection(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:
print(type(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("image-lines", image) def line_detect_possible_demo(image):
gray = cv.cvtColor(image, cv.COLOR_BGR2GRAY)
edges = cv.Canny(gray, 50, 150, apertureSize=3)
lines = cv.HoughLinesP(edges, 1, np.pi/180, 100, minLineLength=50, maxLineGap=10)
for line in lines:
print(type(line))
x1, y1, x2, y2 = line[0]
cv.line(image, (x1, y1), (x2, y2), (0, 0, 255), 2)
cv.imshow("line_detect_possible_demo", image) def main():
img = cv.imread("1.JPG")
cv.namedWindow("Show", cv.WINDOW_AUTOSIZE)
cv.imshow("Show", img)
line_detect_possible_demo(img) cv.waitKey(0)
cv.destroyAllWindows() main()
