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python - What is the output of minAreaRect(contours)

问题描述

I have recently started working with openCV and and python. I have a project where I am finding contours using findContours. I get roughly around 6-8 contours on which I am looping to get the bounding box that fits the contour.

For that I have used minAreaRect(contours) which gives me rotated rectangle that should fit the contour. Now the output of this command is a list of tuples.

Each tuple looks like this ((81.0, 288.0), (22.0, 10.0), -0.0) I couldnt get any description on what each of that number mean?

I think it might be ((x-coordinate, y-coordinate),(width, height), rotation).

标签： pythonopencvcontour

解决方案

你是对的。查看 OpenCV 的 (C++) 文档cv::minAreaRect，我们看到cv::RotatedRect返回了 a 。的完整构造是cv::RotatedRect：

cv::RotatedRect::RotatedRect(const cv::Point2f& center, const cv::Size2f& size, float angle)

对应参数的说明为：

center    The rectangle mass center.
size      Width and height of the rectangle.
angle     The rotation angle in a clockwise direction. When the angle is 0, 90, 180, 270 etc., the rectangle becomes an up-right rectangle.

显然，center和size在 Python API 中被视为元组，并且所有三个参数也作为元组返回。所以，总而言之，这很符合你的假设。

希望有帮助！

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