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POWanting to live-mirror video in OpenCV on OSX, not sure where to start
 

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  1. POWanting to live-mirror video in OpenCV on OSX, not sure where to start
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    <p>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. </p> <p>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:</p> <pre><code> #include "cv.h" #include "highgui.h" #include &lt;stdio.h&gt; // 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-&gt;width*2, frame-&gt;height*2), frame-&gt;depth, frame-&gt;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) &amp; 255) == 27 ) break; } // Release the capture device housekeeping cvReleaseCapture( &amp;capture ); cvDestroyWindow( "Webcam" ); cvDestroyWindow( "Webcam2" ); return 0; } </code></pre>
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    1. CODo you mean *transpose*, *rotate* or *flip* ?
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    2. COTranspose. Basically, I want a matrix [1, 0, 1; 1, 0, 0; 1, 0, 0] to look like [1, 0, 1; 0, 0, 1; 0, 0, 1]. Does that clarify? I don't know how to perform matrix operations on live frames though.
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    3. COThat looks like a left-right flip (mirror image) - is that what you want ?
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