OpenCV之彩色視頻轉黑白視頻

老老老規矩，上代碼

先把核心代碼單獨搞出來喵一眼：

vtColor(frame, BlackWhiteVideo, CV_BGR2GRAY);

來頭擡起來看黑板：

#include <iostream>
 #include <opencv2\opencv.hpp>
 #include <opencv2\highgui\highgui_c.h>
 
 using namespace std;
 using namespace cv;
 
 void main()
 { 
 	VideoCapture capture;
 	capture.open("E:\\gongye1.mp4");
 	if (!capture.isOpened())
 	{ 
 		cout << "can not open ...\n";
 		return;
 	}
 	cvNamedWindow("play vedio");
 	long totalFrameNumber = capture.get(CAP_PROP_FRAME_COUNT); // 獲取視頻的總幀數
 	long i = 1;
 	while (true)
 	{ 
 		Mat frame;
		Mat BlackWhiteVideo;
 		VideoWriter videowriter("E:\\gongye1change.avi", VideoWriter::fourcc('M', 'J', 'P', 'G'), 30, Size(640, 640), true);   //改變圖像的幀速爲30，圖像幀的大小是（640，480）
 		capture >> frame;
 		if (i > totalFrameNumber) break; i++;
 		imshow("play vedio", frame); // 窗口展現原視頻
 		char c = waitKey(33);
 		if (c == 27) break; //按「Esc」退出
 		if (c == 32) waitKey(0);//空格實現暫停
		// CV_BGR2GRAY枚舉值爲6 2.3.4.5:偏黃，6.7.10.11：黑白
		cvtColor(frame, BlackWhiteVideo, CV_BGR2GRAY); // 這句是關鍵
		imshow("BlackWhiteVideo", BlackWhiteVideo); // 窗口展現黑白視頻
 	}
 	capture.release();
 	cvDestroyWindow("play vedio");
 }