想在OSX上的OpenCV中实时镜像视频，不知道从哪里开始 [英] Wanting to live-mirror video in OpenCV on OSX, not sure where to start

问题描述

如果还不是很明显，这是我第一天玩OpenCV。
我希望做的是mirror frame2，然后upsample它。

If it isn't already obvious, this is my first day playing around with OpenCV. What I am hoping to do is mirror frame2, and then upsample it.

我不知道如何在这些类型为IplImage的帧上使用矩阵运算。我如何镜像我的frame2，然后上传到Webcam2窗口？以下是我的代码：

I am not sure how to use a matrix operation on these frames which are of type IplImage. How could I mirror my frame2, and then upsample it to the Webcam2 window? Below is my code:

 #include "cv.h" 
 #include "highgui.h" 
 #include <stdio.h>  



 // A Simple Camera Capture Framework 
 int main() {
   CvCapture* capture = cvCaptureFromCAM( CV_CAP_ANY );
   if ( !capture ) {
     fprintf( stderr, "ERROR: capture is NULL \n" );
     getchar();
     return -1;
   }
   // Create a window in which the captured images will be presented
   cvNamedWindow( "Webcam", CV_WINDOW_AUTOSIZE );
   cvNamedWindow( "Webcam2", CV_WINDOW_AUTOSIZE );
   // Show the image captured from the camera in the window and repeat
   while ( 1 ) {
     // Get one frame
     IplImage* frame = cvQueryFrame( capture );
     IplImage* frame2 = cvCreateImage(cvSize (frame->width*2, frame->height*2), 
     frame->depth, frame->nChannels);
     cvPyrUp (frame, frame2);



        if ( !frame ) {
       fprintf( stderr, "ERROR: frame is null...\n" );
       getchar();
       break;
     }

     cvShowImage( "Webcam", frame );
     cvShowImage( "Webcam2", frame2 );
     // Do not release the frame!
     //If ESC key pressed, Key=0x10001B under OpenCV 0.9.7(linux version),
     //remove higher bits using AND operator
     if ( (cvWaitKey(10) & 255) == 27 ) break;
   }
   // Release the capture device housekeeping
   cvReleaseCapture( &capture );
   cvDestroyWindow( "Webcam" );
   cvDestroyWindow( "Webcam2" );
   return 0;
 }

推荐答案

OpenCV，调用 flip（）。 C对应名为 cvFlip（）。我确定它会帮助你。

There is a neat function in OpenCV, called flip(). The C counterpart is named cvFlip(). And I am sure it will help you.

我也会给你我总是给出的建议：从C接口移动到C ++！更清洁，更安全，更容易！

And I will also give you the advice I always give: Move from the C interface to C++! Much cleaner, much safer, much easier!

您可以检查这个答案看看两者之间的区别。

You can check this answer to see the differences between the two.

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