如何提取来自OpenCV的轮廓，简单的几何形状 [英] How to extract simple geometric forms from contours in opencv

问题描述

我有一个垫轮廓，我已经接近每轮廓与 approxPolyDP 。 我想现在要做的就是检测形式，如矩形，三角形，圆形。而如重绘它们以不同的颜色，或用帆布等。

I have a Mat contours and I have approximated each contour with approxPolyDP. What I want to do now is detecting forms like rectangle, triangle, circle. And e.g. redraw them in a different color or using canvas etc.

有没有利用轮廓的一种方式？我怎样才能访问点垫的轮廓和简化他们远一点（删除变形或者如果两个显著点如此接近，我可以安全地删除其中的一个）？

Is there a way of making use of the contours? How can I access points in Mat contours and simplify them a little further (removing deformations or if two significant points are so close together, that I can safely remove one of them)?

我正在开发使用Java（Android的），所以不是每一个C / C ++的方法/类型提供给我（或JNI调用将是一种浪费）。

I am developing in Java (Android), so not every C/C++ method/type is available to me (or a JNI-call would be a waste).

推荐答案

等高线返回矢量>轮廓。你可以做这样的事情很容易地访问它们在C：

The contours are returned as vector > contours. You can access them easily in C++ by doing something like:

vector<vector<Point> > contours;
findContours(..,contours,...);
contours.at(0).at(0) //first point of first contour

如果您要访问他们用垫，那么你就需要考什么安排生产。它应该是很容易的，但是，尽管话说回来，JNI和Android的OpenCV是一种痛苦。

If you are accessing them using a Mat then you will need to test what arrangement is produced. It should be very easy, though, although having said that, JNI and android opencv is a pain.

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