如何在OpenCV中绘制具有随机颜色的圆

问题描述

我正在使用SURF算法将两个图像与OpenCV匹配。
而且我有按键。

I am using SURF algorithm to match two images with OpenCV.And I have got the keypioints.

现在，我想用随机的颜色圆圈绘制这些关键点。

Now I want to draw these keypoints with random colors circles.

我知道如何使用cvCircle函数在OpenCV中绘制圆，但是颜色由 cvScalar（r，g，b）固定。

I know how to draw a circle in OpenCV with the function cvCircle, but the color is fixed with cvScalar(r,g,b).

我希望图像中关键点的圆形颜色与其附近的圆形不同。

I want the the color of the circle of a keypoint in a image is different to the circles near it.

库函数OpenCV中的 cv :: drawMatches（）具有我想要的效果。但是我不知道该怎么实现。

The library function cv::drawMatches() in OpenCV have the effect I want. But I don't know how to realize it.

有人可以告诉我如何绘制圆圈吗？

Does anyone who can tell me how to draw the circles.

谢谢！

推荐答案

假设您要在垫子图像上绘制不同颜色的圆圈。这是一种生成随机颜色的方法：

Suppose you want to draw circles in different colors on Mat image. Here is a way to generate random colors:

RNG rng(12345);
Mat image = Mat::zeros(500, 500, CV_8UC3);     // change to the size of your image
for (int i = 0; i < circleNum; i++) {
    Scalar color = Scalar(rng.uniform(0,255), rng.uniform(0, 255), rng.uniform(0, 255));
    circle(image, center[i], radius[i], color, -1, 8, 0);
}

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