白色像素占比

#include <opencv2/opencv.hpp>
#include <iostream>
#include <vector>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
using namespace std;
using namespace cv;
double sum(Mat src)
{
	double counterw = 0;
	double counterz = 0;
	Mat_<uchar>::iterator it = src.begin<uchar>();
	Mat_<uchar>::iterator itend = src.end<uchar>();
	for (; it != itend; it++)
	{
		if ((*it) > 0)
			counterw += 1;
		if ((*it) == 0)
			counterz += 1;
	}
	double a = counterw * 1.0 / (counterz + counterw) * 100;
	return a;
}
int main()
{
	Mat huabu(1000, 1000, CV_8UC3, Scalar(0, 0, 0));
	line(huabu, Point(5, 10), Point(5, 950), Scalar(255, 255, 255), 2, LINE_AA);
	line(huabu, Point(5, 10), Point(2,15), Scalar(255, 255, 255), 2, LINE_AA);
	line(huabu, Point(5, 10), Point(8, 15), Scalar(255, 255, 255), 2, LINE_AA);
	line(huabu, Point(5, 950), Point(950, 950), Scalar(255, 255, 255), 2, LINE_AA);
	line(huabu, Point(950, 950), Point(945, 945), Scalar(255, 255, 255), 2, LINE_AA);
	line(huabu, Point(950, 950), Point(945, 955), Scalar(255, 255, 255), 2, LINE_AA);
	VideoCapture capture("34.avi");
	int i = 15;
	float last = 0;
	while (1)
	{
		Mat s1;
		capture >> s1;
		namedWindow("原视频", WINDOW_NORMAL);
		imshow("原视频", s1);
		Mat s3 = s1(Rect(Point(0, 80), Point(180,270)));
		if (s3.empty())
		{
			cout << "n=vedio is over";
			return 0;
		}
		Mat s2;
		cvtColor(s3, s2, COLOR_BGR2GRAY);


		threshold(s2, s2, 253, 255, THRESH_BINARY);

		namedWindow("阈值1", WINDOW_NORMAL);
		imshow("阈值1", s2);
		double a = sum(s2);
		//double *p = &a;
		//vector<Point>g;
		cout << "图片s1白色占比：" << a << endl;
		//---------
		int h = 100;
		int w = 100;
		line(huabu, Point(i - 10, 950 - last * 10), Point(i, 950 - a * 10), Scalar(0, 0, 255), 2, LINE_AA);
		i += 10;
		last = a;
		namedWindow("画布", WINDOW_NORMAL);
		imshow("画布", huabu);
		waitKey(500);
	}
	return 0;
}