OpenCV Python如何拟合直线

可以使用OpenCV库的Hough变换函数来拟合直线。具体步骤是首先进行边缘检测，然后调用HoughLines函数检测直线，最后使用polylines函数绘制检测到的直线。代码示例：

import cv2
import numpy as np

# 读入图像
img = cv2.imread('input_image.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

# 边缘检测
edges = cv2.Canny(gray, 50, 150, apertureSize=3)

# Hough变换检测直线
lines = cv2.HoughLines(edges, 1, np.pi/180, 200)

# 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)

# 显示结果
cv2.imshow('result', img)
cv2.waitKey(0)
cv2.destroyAllWindows()