OpenCV之处理视频帧

<pre name="code" class="cpp">目的：实时监测视频的边缘轮廓。

//边缘检测void canny(Mat &input, Mat &output){if (input.channels() == 3)//将彩色图像转为灰度图像{cvtColor(input, output, CV_BGR2GRAY);}Canny(output, output, 100, 200);//计算Canny边缘threshold(output, output, 128, 255, THRESH_BINARY_INV);//反转图像}class VideoProcessor{public:VideoProcessor() : callIt(true), delay(0),fnumber(0), stop(false), frameToStop(-1){}//设置回调函数void setFrameProcessor(void(*frameProcessingCallback)(Mat &, Mat &)){process = frameProcessingCallback;}//设置视频文件的名称bool setInput(string filename){fnumber = 0;//释放之前打开过的资源capture.release();//打开视频文件return capture.open(filename);}//创建输入窗口void displayInput(string wn){windowsNameInput = wn;namedWindow(windowsNameInput);}//创建输出窗口void displayOutput(string wn){windowsNameOutput = wn;namedWindow(windowsNameOutput);}void dontDisplay(){destroyAllWindows();windowsNameInput.clear();windowsNameOutput.clear();}void stopIt(){stop = true;}bool isStopped(){return stop;}bool isOpened(){return capture.isOpened();}void setDelay(int d){delay = d;}bool readNextFrame(Mat&frame){return capture.read(frame);}long getFrameNumber(){long fnumber = static_cast<long>(capture.get(CV_CAP_PROP_POS_FRAMES));return fnumber;}void callProcess(){callIt = true;}void dontCallProcess(){callIt = false;}void stopAtFrameNo(long frame){frameToStop = false;}void run(){Mat frame;//当前帧Mat output;//输出帧if (!isOpened()){return;}stop = false;while (!isStopped()){//读取下一帧if (!readNextFrame(frame)){break;}//显示输出帧if (windowsNameInput.length()!=0){imshow(windowsNameInput,frame);}//调用处理函数if (callIt){//处理当前帧process(frame, output);//增加帧数fnumber++;}else{output = frame;}//显示输出帧if (windowsNameOutput.length()!=0){imshow(windowsNameOutput,output);}//引入延迟if (delay>=0&&waitKey(delay)>=0){stopIt();}//检测是否需要停止运行if (frameToStop>=0&&getFrameNumber()==frameToStop){stopIt();}}}private:VideoCapture capture;//捕捉视频图像void(*process)(Mat&, Mat&);//每帧调用回调函数bool callIt;//确定是否调用回调函数string windowsNameOutput;//输出窗口名string windowsNameInput;//输入窗口名int delay;//延迟long fnumber;//已处理的帧数long frameToStop;//在该帧数停止bool stop;//是否停止};void test_VideoProcessor(){VideoProcessor processor;processor.setInput("一剪梅.avi");processor.displayInput("当前帧");processor.displayOutput("输出帧");processor.setDelay(25);//设置延迟processor.setFrameProcessor(canny);//设置处理回调函数processor.run();//开始处理}

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