边缘检测后获取边缘坐标(Canny) [英] Get edge co-ordinates after edge detection (Canny)

问题描述

我已经使用OpenCV了很短的时间，并且对图像进行了Canny Edge Detection，并且之后还进行了膨胀处理，以进一步将对象(在我的情况下为正方形)与背景分离.

I have been working with OpenCV for a fairly short time, and have performed Canny Edge Detection on an image, and also performed dilation after that to further separate the object (in my case a square) from the background.

我的问题现在是使用一种算法来识别2D中的可抓取区域，该算法要求我处理这些边缘中的点的坐标.有什么方法可以使用OpenCV获取角的坐标，以便找到构成正方形边缘的直线的方程式?我知道正方形的大小.我的问题涉及二维坐标几何，因此需要坐标.

My problem, now is to identify graspable regions in 2D using an algorithm that requires me to handle co-ordinates of the points in those edges. Is there any way I can use OpenCV to get the co-ordinates of the corners so I can find the equation of the lines forming the edge of the square? I know the size of the square. My problem involves 2D co-ordinate geometry, and hence the need for co-ordinates.

如果需要，我可以在边缘检测和扩张后提供图像.帮助将不胜感激.

I can provide the image after edge detection and dilation if need be. Help would be appreciated a lot.

推荐答案

仅提供第二种方法-不保证可以使用.

Just offering a second method - not guaranteed to work.

• 步骤1:提取连接的零部件及其轮廓.这可以在"Canny边缘检测"步骤之后应用.
  • 查找轮廓
  • Step 1: extract connected component and their contours. This can be applied after the Canny Edge Detection step.
    • FindContours
    • BoundingRect -如果矩形始终是直立的(不是旋转)
    • MinAreaRect -如果矩形是旋转的.
    • BoundingRect - if the rectangles are always upright (not rotated)
    • MinAreaRect - if the rectangles are rotated.

    免责声明的原因是，它仅在非常干净的结果上起作用，而没有任何折断的边缘或Canny边缘中的间隙等.如果您需要更可靠的查找矩形的方法，请

    The reason for the disclaimer is that it only works on very clean results, without any broken edges or gaps in the Canny edges, etc. If you need a more robust way of finding rectangles, Hough transform will be necessary.

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