opencv“数字图片”升级版，“数字视频”

最新推荐文章于 2024-01-13 09:42:16 发布

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本文探讨了如何利用OpenCV库从数字视频中提取帧，并进行图像处理操作，如分析、转换和过滤，以实现视频内容的增强和分析。

#include <iostream>  
#include <opencv2/core/core.hpp>  
#include <opencv2/highgui/highgui.hpp>  
#include<opencv2/imgproc/imgproc.hpp>
#include <cmath> 
using namespace cv;
using namespace std;

int main()
{
	double t = 9;
	int rate = 30;//帧率
	Mat src_in;
	VideoCapture cap("1.mp4");
	VideoWriter writer("1_1.avi", CV_FOURCC('M', 'J', 'P', 'G'), rate, Size(854, 480));
	if (!cap.isOpened()) {
		return -1;
	}
	while (1) {
		cap >> src_in;
		Mat src_clone = src_in.clone();
		
		Mat src = Mat(Size(src_in.cols * 1.0 / t, src_in.rows * 1.0 / t), src.type());
		Mat dst(src_in.size(), src_in.type(), Scalar(255, 255, 255));
		resize(src_in, src, Size(src_in.cols / t, src_in.rows / t), 2);

		string str[10] = { "9","8", "7", "6", "5", "4", "3", "2", "1", "0" };
		cvtColor(src, src, CV_BGR2GRAY);
		blur(src, src, Size(3, 3));
		for (int i = 0; i < src.rows; i++) {
			for (int j = 0; j < src.cols; j++) {
				int c = (int)src.at<uchar>(i, j);
				int b = (int)src_clone.at<Vec3b>(i + i * (t - 1), j + j * (t - 1))[0];
				int g = (int)src_clone.at<Vec3b>(i + i * (t - 1), j + j * (t - 1))[1];
				int r = (int)src_clone.at<Vec3b>(i + i * (t - 1), j + j * (t - 1))[2];
				putText(dst, str[(c * 9) / 255], Point(j + j * (t - 1), i + i * (t - 1)), FONT_HERSHEY_PLAIN,
					0.5, Scalar(b, g, r), 1, 8);

			}
		}
		imshow("效果图", dst);
		writer << dst;
		
		if (waitKey(rate) >= 0) {
			break;
		}
	}
	return 0;
}