我正在尝试在单独的函数中显示视频,我正在使用向量i push_back每个帧然后将此向量传递给函数但我的函数重复显示单个帧。我的代码如下。请告诉我我做错了什么。
// newproject.cpp : Defines the entry point for the console application.
#include "stdafx.h"
#include "highgui.h"
#include <stdio.h>
#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <conio.h>
#include <opencv2/imgproc/imgproc.hpp> // Gaussian Blur
#include <opencv2/core/core.hpp> // Basic OpenCV structures (cv::Mat, Scalar)
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <conio.h>
using namespace cv;
using namespace std;
class frameprocessing{
Mat hsv_base;
MatND hist_base;
public:
void hsv_histogram(Mat Frame)
{
cvtColor( Frame, hsv_base, CV_BGR2HSV );
int h_bins = 50;
int s_bins = 32;
int histSize[] = { h_bins, s_bins };
float h_ranges[] = { 0, 256 };
float s_ranges[] = { 0, 180 };
const float* ranges[] = { h_ranges, s_ranges };
int channels[] = { 0, 1 };
calcHist( &hsv_base, 1, channels, Mat(), hist_base, 2, histSize, ranges, true, false );
}
};
class video{
Mat frame;
string filename;
double dWidth;
double dHeight;
public:
video()
{
}
video(string videoname)
{
vector<Mat> videoframes;
std::vector<Mat>::iterator it;
it = videoframes.begin();
filename = videoname;
VideoCapture capture(filename);
if( !capture.isOpened() )
{
exit(0);
}
dWidth = capture.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
dHeight = capture.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video
frameprocessing obj;
for( ; ; )
{
capture >> frame;
if(frame.empty())
break;
obj.hsv_histogram(frame);
videoframes.push_back(frame);
}
displayvideo(videoframes);
// waitKey(0); // key press to close window
}
void writer()
{
Size frameSize(static_cast<int>(dWidth), static_cast<int>(dHeight));
VideoWriter oVideoWriter ("D:/MyVideo.avi", CV_FOURCC('P','I','M','1'), 20, frameSize, true); //initialize the VideoWriter object
if ( !oVideoWriter.isOpened() ) //if not initialize the VideoWriter successfully, exit the program
{
cout << "ERROR: Failed to write the video" << endl;
exit(0);
}
}
void displayvideo(vector<Mat> videoframe)
{
Mat tempframe;
while(!videoframe.empty()) //Show the image captured in the window and repeat
{
tempframe = videoframe.back();
imshow("video", tempframe);
videoframe.pop_back();
waitKey(20); // waits to display frame
}
// waitKey(0);
}
void displayframe(Mat frame)
{
imshow("video", frame);
waitKey(20); // waits to display frame
}
};
int _tmain(int argc, _TCHAR* argv[])
{
video obj("video.avi");
//obj.readvideo();
}
答案 0 :(得分:1)
您需要将框架复制或克隆到另一个垫子,然后推送到您的矢量,更改您的代码,如
for( ; ; )
{
capture >> frame;
if(frame.empty())
break;
Mat tmp=frame.clone();
obj.hsv_histogram(tmp);
videoframes.push_back(tmp);
}
在你的代码中,你每次都将为帧分配的相同指针传递给你的向量,所以你将得到一个Mat数组,指向向量中的单个(相同)内存位置。要了解有关OpenCV Mat和内存分配的更多信息,请参阅documantation