基于opencv的简单视频处理类示例

#include "opencv2/opencv.hpp"  
using namespace std;  
using namespace cv;  

class VideoProcessor
{
private:  
	VideoCapture caputure;  
	//图像处理函数指针  
	void (*process)(Mat &,Mat &);  
	bool callIt;  
	string WindowNameInput;  
	string WindowNameOutput;  
	//延时  
	int delay;  
	long fnumber;  
	//第frameToStop停止  
	long frameToStop;  
	//暂停标志  
	bool stop;  

public:  
	VideoProcessor() : callIt(true),delay(0),fnumber(0),stop(false),frameToStop(-1){}

	//设置图像处理函数  
	void setFrameProcess(void (*process)(Mat &,Mat &)){  
		this->process = process;  
	}  

	//打开视频  
	bool setInput(string filename){  
		fnumber = 0;  
		//若已打开，释放重新打开  
		caputure.release ();  
		return caputure.open (filename);  
	}  

	//设置输入视频播放窗口  
	void displayInput(string wn){  
		WindowNameInput = wn;  
		namedWindow (WindowNameInput);  
	}  

	//设置输出视频播放窗口  
	void displayOutput(string wn){  
		WindowNameOutput = wn;  
		namedWindow (WindowNameOutput);  
	}  

	//销毁窗口  
	void dontDisplay(){  
		destroyWindow (WindowNameInput);  
		destroyWindow (WindowNameOutput);  
		WindowNameInput.clear ();  
		WindowNameOutput.clear ();  
	}  

	//启动  
	void run()
	{
		Mat frame;  
		Mat output;  

		if(!isOpened())  
			return;  

		stop = false;  
		while(!isStopped())
		{  
			//读取下一帧  
			if(!readNextFrame(frame))  
				break;  
			if(WindowNameInput.length ()!=0)  
				imshow (WindowNameInput,frame);  
			//处理该帧  
			if(callIt){  
				process(frame,output);  
			}  
			else{  
				output = frame;  
			}  
			if(WindowNameOutput.length ()!=0)  
				imshow (WindowNameOutput,output);  
			//按键暂停，继续按键继续  
			if(delay>=0&&waitKey (delay)>=0)  
				waitKey(0);  
			//到达指定暂停键，退出  
			if(frameToStop>=0&&getFrameNumber()==frameToStop)  
				stopIt();  
		}
	}
	
	//暂停键置位  
	void stopIt(){  
		stop = true;  
	}  
	//查询暂停标志位  
	bool isStopped(){  
		return stop;  
	}  
	//返回视频打开标志  
	bool isOpened(){  
		return  caputure.isOpened ();  
	}  
	//设置延时  
	void setDelay(int d){  
		delay = d;  
	}  
	//读取下一帧  
	bool readNextFrame(Mat &frame){  
		return caputure.read (frame);  
	}  

	void CallProcess(){  
		callIt = true;  
	}  
	void  dontCallProcess(){  
		callIt = false;  
	}  

	//设置停止帧  
	void stopAtFrameNo(long frame){  
		frameToStop = frame;  
	}  
	// 获得当前帧的位置  
	long getFrameNumber(){  
		long fnumber = static_cast(caputure.get ((CV_CAP_PROP_POS_FRAMES)));  
		return fnumber;  
	}  
	//获取帧率  
	double getFrameRate(){  
		return caputure.get(CV_CAP_PROP_FPS);  
	}  
};

//帧处理函数：canny边缘检测  
static void canny(cv::Mat& img, cv::Mat& out) {  
	//灰度变换  
	if (img.channels()==3)  
		cvtColor(img,out,CV_BGR2GRAY);  
	// canny算子求边缘  
	Canny(out,out,100,200);  
	//颜色反转，看起来更舒服些  
	threshold(out,out,128,255,cv::THRESH_BINARY_INV);  
}  

int main(int argc, char *argv[])
{
	VideoProcessor processor;  
	//打开输入视频  
	processor.setInput ("MAH00054.MP4");  
	processor.displayInput ("Current Frame");  
	processor.displayOutput ("Output Frame");  
	//设置每一帧的延时  
	processor.setDelay (1000./processor.getFrameRate ());  
	//设置帧处理函数，可以任意  
	processor.setFrameProcess (canny );  
	processor.run ();  
	return 0;  
}