opencv c++ 随机数与随机颜色(15)

知识点:

opencv内置随机数API

RNG rng(随机数种子)

在生成RNG实例后,一般会对其调用uniform函数,来返回某区间的随机数,如:

rng.uniform(0, 255)

应用:在画板上不断生成随机线条

代码

void QuickDemo::random_drawing_demo()
{
	Mat canvas = Mat::zeros(Size(512, 512), CV_8UC3);
	int w = canvas.cols;
	int h = canvas.rows;
	//用伪随机方法生成随机数,12345是随机数种子,可以把系统时间作为随机数种子实现真随机: RNG rng((unsigned)time(NULL))
	RNG rng(12345);
	while (true) {
		int c = waitKey(1000);
		if (c == 27) {
			cout << "enter esc ,quit" << endl;
			break;
		}

		//使用使用随机数和均匀分布返回随机数
		int x1 = rng.uniform(0, w);
		int y1 = rng.uniform(0, h);
		int x2 = rng.uniform(0, w);
		int y2 = rng.uniform(0, h);
		int b = rng.uniform(0, 255), g = rng.uniform(0, 255), r = rng.uniform(0, 255);
		line(canvas, Point(x1, y1), Point(x2, y2), Scalar(b, g, r), 3, LINE_AA, 0);
		imshow("随机绘制", canvas);
	}
	
}

结果:

opencv c++ 随机数与随机颜色(15)_第1张图片

 其中关于line函数的解释参见:

(25条消息) opencv c++图像几何形状绘制_lucust的博客-CSDN博客

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