OpenCV中HoughLines检测直线原理图解画线时点的确定：为什么要乘以1000 画出所有直线 Python代码实现

最新推荐文章于 2025-03-11 13:00:00 发布

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最新推荐文章于 2025-03-11 13:00:00 发布 · 5k 阅读

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#OpenCV #Hough Transform

Table of Contents

原理图解

OpenCV中HoughLines两个点为什么要乘以1000

Python代码实现

图片效果

原理图解

官方文档解释：

A line can be represented as $y = mx+c$ or in parametric form, as $\rho = x \cos \theta + y \sin \theta$ where $\rho$ is the perpendicular distance from origin to the line, and $\theta$ is the angle formed by this perpendicular line and horizontal axis measured in counter-clockwise ( That direction varies on how you represent the coordinate system. This representation is used in OpenCV).

So if line is passing below the origin, it will have a positive rho and angle less than 180. If it is going above the origin, instead of taking angle greater than 180, angle is taken less than 180, and rho is taken negative. Any verti