不能使用OpenCV保存图像

问题描述

我尝试从影片档案储存图片，但无法在我的硬碟中储存任何图片。我编译了以下程序没有错误。

I was trying to save images from a video file but It couldn't save any image in my hard drive. I compiled following program without errors.

#include <stdio.h>
#include <stdlib.h>
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>

int main(int argc, char* argv[]) {

    int c=1;
    IplImage* img=0;
    IplImage* small;
    IplImage* small=new IplImage(inputArray);
    char buffer[1000];
    CvCapture* cv_cap=cvCaptureFromFile("test.avi");
    cvNamedWindow("Video",CV_WINDOW_AUTOSIZE);
    while(1) {

        img=cvQueryFrame(cv_cap);
        cvShowImage("Video",img);
        small = cvCreateImage(cvSize(img->width/2,img->height/2), 8, 3);
        sprintf(buffer,"C:/image%u.jpg",c);


        c++;
        if (cvWaitKey(100)== 27) break;
    }

    cvDestroyWindow("Video");
    return 0;
}

我使用的是2.3.1 openCV库和Visual Studio 2010.
如何从视频文件保存图像？

I am using a 2.3.1 openCV library and Visual Studio 2010.How can I save the image from a video file?

我也试过这个代码，上面的程序代码有些错误。请看下面的程序代码。我添加以下代码后，也有同样的问题。

I have also tried this code,above program code are something wrong.please see following program code.After i adding following code ,also there was a same problem.

   cvSaveImage(buffer,img);

更正的程序如下所示。看到这个，告诉我我做错了什么。编译错误。运行程序后，它不保存任何图像。

Corrected program is shown below.please see this and tell me what i did wrong.but there is not compile error.after i run the program it doesn't save any image.

  #include"stdafx.h"
  #include<cv.h>
  #include<highgui.h>
  #include<cxcore.h>


  int main(int argc, char* argv[]) {

  int c=1;
  IplImage* img=0;
  char buffer[1000];
  CvCapture* cv_cap=cvCaptureFromCAM(-1);
  cvNamedWindow("Video",CV_WINDOW_AUTOSIZE);
  while(1) {

  img=cvQueryFrame(cv_cap);
  cvShowImage("Video",img);
  sprintf(buffer,"D:/image%u.jpg",c);
  cvSaveImage(buffer,img);
  c++;
    if (cvWaitKey(100)== 27) break;
  }

  cvDestroyWindow("Video");
  return 0;
  }

你能告诉我如何保存图片。

can you tell me how to save a image .above program doesn't save any images.please give me your suggestions.thank you.

推荐答案

不知道你是否解决了问题。如果不是你可以使用imwrite（test.jpg，img）;保存图片

Don't know if you solved the problem or not. if not you can use imwrite("test.jpg",img); to save an image,

这里是一个示例 -
while（1）{

here is an example- while(1) {

  img=cvQueryFrame(cv_cap);
  cvShowImage("Video",img);
  imwrite("test.jpg",img);
}

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