Opencv学习笔记——视频高斯模糊并分别输出

用两个窗口进行对比

#include "stdafx.h"
#include <iostream>
#include <opencv2/core/core.hpp>   
#include <opencv2/highgui/highgui.hpp>  
#include "cv.h"
using namespace cv;
using namespace std;

int g_slider_position = 0, temp;
CvCapture *g_captrue = NULL;
void onTrackbarSlide(int pos)
{
    cvSetCaptureProperty(g_captrue, CV_CAP_PROP_POS_FRAMES, 
    pos);
    temp = g_slider_position;
}

int main(int argc, char **argv)
{
    cvNamedWindow("sample-out", CV_WINDOW_AUTOSIZE);
    //创建输出处理后视频的窗口
    cvNamedWindow("sample", CV_WINDOW_AUTOSIZE);
    //创建初始视频窗口
    g_captrue = cvCreateFileCapture("sample.avi");
    //Cvcapture结构体赋值
    int frames = (int)cvGetCaptureProperty(g_captrue, 
    CV_CAP_PROP_FRAME_COUNT);
    //获取视频总帧数
    if (frames != 0)///若视频存在即帧数不为0则创建滚动条
    {
        cvCreateTrackbar("Position", "sample", 
        &g_slider_position, frames, onTrackbarSlide);
    }
    IplImage *frame;//创建图像指针
    while (1)
    {
        frame = cvQueryFrame(g_captrue);//读取一帧
        if (!frame)//读完退出
            break;
        cvShowImage("sample", frame);//显示在sample窗口中
        IplImage* out = cvCreateImage(cvGetSize(frame), 
        IPL_DEPTH_8U, 3);
        //创建视频地址并为其开辟空间。
        cvSmooth(frame, out, CV_GAUSSIAN, 3, 3);//对每一帧高斯模糊
        cvShowImage("sample-out", out);//视频输出到sample-out窗口中
        char c = cvWaitKey(30);//每一帧间隔30ms
        cvSetTrackbarPos("Position", "sample", temp++);//滚动条随动
        if (c == 27)
            break;
    }
    cvReleaseCapture(&g_captrue);//释放指针
    cvDestroyWindow("sample");//删除sample初始视频窗口
    cvDestroyWindow("sample-out");//删除sample-out处理后的视频窗口
    return 0;
}