OpenCV绘制延长线：实现图像中的线条延长效果

利用OpenCV库进行图像处理，实现线条的延长效果。通过计算线条方向和长度，结合延长线长度因子确定新终点，最终用OpenCV绘制延长线。读者可以调整起点终点、延长长度、颜色和线条粗细等参数，适应不同应用场景。

import cv2
import numpy as np

# 读取图像
image_path = 'image.jpg'
image = cv2.imread(image_path)

# 定义线条的起点和终点
start_point = (100, 100)
end_point = (400, 400)

# 计算线条的方向和长度
direction = np.subtract(end_point, start_point)
length = np.linalg.norm(direction)

# 设置延长线的长度因子
extension_factor = 1.5

# 计算延长线的终点
extended_end_point = tuple(np.add(end_point, extension_factor * direction / length).astype(int))

# 绘制延长线
thickness = 2
color = (0, 255, 0)  # 线条颜色为绿色
cv2.line(image, start_point, extended_end_point, color, thickness)

# 显示结果
cv2.imshow('Extended Line', image)
cv2.waitKey(0)
cv2.destroyAllWindows()