Opencv实践项目之实时物体的测量——c++_c sharp语言实现视频中物体长度测量的例子

全局变量

Mat matrix;
Point2f center;
Mat frame;
float scale = 0.25;
bool flag = false;
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主函数

int main()
{
   
	frame = imread("celiang.jpg");
	resize(frame, frame, Size(0,0), scale, scale, INTER_LINEAR);
	imshow("original", frame);
	int thres[] = {
    50,255 };
	Mat out;
	Point2f a4;
	getcontours(frame, thres,out,a4);
	//A4纸的长度为210，宽度为297
	double a4_width = 210;
	double a4_height = 297;
	int scale = 3;
	Point2f mart;
	int th[] = {
    50,255 };
	getcontours_2(out, th,mart);

	if (flag)
	{
   
		int wid = round(mart.x / a4.x * a4_width);
		int hei = round(mart.y / a4.y * a4_height);
		string w = to_string(wid)+"cm";
		
		putText(out, w, Point(center.x, center.y - 50), FONT_HERSHEY_SCRIPT_COMPLEX, 1, Scalar(0, 0, 255), 1);
		string h = to_string(hei)+"cm";
		putText(out, h, Point(center.x - 70, center.y + hei ), FONT_HERSHEY_SCRIPT_COMPLEX, 1, Scalar(0, 0, 255), 1);
	}
	imshow("test", out);
	waitKey(0);
	return 0;
}
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参照物识别

void getcontours(Mat img, const int arr[],Mat& out,Point2f& ob,int minarea=1000*scale)
{
   
	
	Mat imggray;
	cvtColor(img,imggray, COLOR_BGR2GRAY);
	Mat imggauss;
	GaussianBlur(imggray
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