#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>
using namespace std;
using namespace cv;
int main()
{
//打开视频文件：其实就是建立一个VideoCapture结构
VideoCapture capture("C:/Projects/test.avi");
//检测是否正常打开:成功打开时，isOpened返回ture
if(!capture.isOpened())
cout<<"fail to open!"<<endl;
//获取整个帧数
long totalFrameNumber = capture.get(CV_CAP_PROP_FRAME_COUNT);
cout<<"整个视频共"<<totalFrameNumber<<"帧"<<endl;
//设置开始帧()
long frameToStart = 300;
capture.set( CV_CAP_PROP_POS_FRAMES,frameToStart);
cout<<"从第"<<frameToStart<<"帧开始读"<<endl;
//设置结束帧
int frameToStop = 400;
if(frameToStop < frameToStart)
{
cout<<"结束帧小于开始帧，程序错误，即将退出！"<<endl;
return -1;
}
else
{
cout<<"结束帧为：第"<<frameToStop<<"帧"<<endl;
}
//获取帧率
double rate = capture.get(CV_CAP_PROP_FPS);
cout<<"帧率为:"<<rate<<endl;
//定义一个用来控制读取视频循环结束的变量
bool stop = false;
//承载每一帧的图像
Mat frame;
//显示每一帧的窗口
namedWindow("Extracted frame");
//两帧间的间隔时间:
//int delay = 1000/rate;
int delay = 1000/rate;
//利用while循环读取帧
//currentFrame是在循环体中控制读取到指定的帧后循环结束的变量
long currentFrame = frameToStart;
//滤波器的核
int kernel_size = 3;
Mat kernel = Mat::ones(kernel_size,kernel_size,CV_32F)/(float)(kernel_size*kernel_size);
while(!stop)
{
//读取下一帧
if(!capture.read(frame))
{
cout<<"读取视频失败"<<endl;
return -1;
}
//这里加滤波程序
imshow("Extracted frame",frame);
filter2D(frame,frame,-1,kernel);
imshow("after filter",frame);
cout<<"正在读取第"<<currentFrame<<"帧"<<endl;
//waitKey(int delay=0)当delay ≤ 0时会永远等待；当delay>0时会等待delay毫秒
//当时间结束前没有按键按下时，返回值为-1；否则返回按键
int c = waitKey(delay);
//按下ESC或者到达指定的结束帧后退出读取视频
if((char) c == 27 || currentFrame > frameToStop)
{
stop = true;
}
//按下按键后会停留在当前帧，等待下一次按键
if( c >= 0)
{
waitKey(0);
}
currentFrame++;
}
//关闭视频文件
capture.release();
waitKey(0);
return 0;
}
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