如何在OpenCV中的图像上画一条线? [英] How to draw a line on an image in OpenCV?

问题描述

如果我有一条线的极坐标，如何在OpenCV&中将其绘制在图像上? python?

If I have the polar coordinates of a line, how can I draw it on an image in OpenCV & python?

Line 函数得2分，但绘制仅细分.我想从图像的一条边缘到另一条边缘画一条线.

Line function takes 2 points, but draws only the segment. I want to draw a line from one edge of the image to other.

推荐答案

仅计算2分即可. opencv的Line可以用例如(-10，-10)表示一个点.

Just calculate for 2 points outside. opencv's Line is fine with e.g. (-10,-10) for a point.

import cv2  # python-opencv
import numpy as np

width, height = 800, 600
x1, y1 = 0, 0
x2, y2 = 200, 400
image = np.ones((height, width)) * 255

line_thickness = 2
cv2.line(image, (x1, y1), (x2, y2), (0, 255, 0), thickness=line_thickness)

http://docs.opencv.org /2.4/modules/core/doc/drawing_functions.html#cv2.line

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