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POAndroid opencv camera rotation issue in mobile device
 

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    <p>I have developed an android application for a specific tablet device of 800 * 480 screen resolution. The project objective is to capture the image(with face detection). For this I used opencv2.4.2 sdk to capture image(used opencv face detection sample). In that device the camera available in the right bottom corner. So I captured image with the reverse portrait mode(using transpose the image).</p> <pre><code>The code snippet is below: @Override protected Bitmap processFrame(VideoCapture capture) { FdActivity.mSquaredImage = 0; resolution = 0; capture.retrieve(mRgba, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA); capture.retrieve(mGray, Highgui.CV_CAP_ANDROID_GREY_FRAME); Core.transpose(mRgba, mRgba); Core.transpose(mRgba, mGray); ..... ..... return bmp; } </code></pre> <p>It is working fine in android tablet.</p> <p>Now I want to use my application with mobile device. So I tested it with SAMSUNG GALAXY S II. </p> <p>And I got one issue.</p> <pre><code>The following code is to open the camera. The code snippet is below: public boolean openCamera() { Log.i(TAG, "openCamera"); synchronized (this) { releaseCamera(); mCamera = new VideoCapture(Highgui.CV_CAP_ANDROID); if (!mCamera.isOpened()) { mCamera.release(); mCamera = null; Log.e(TAG, "Failed to open native camera"); return false; } } return true; } </code></pre> <p>This code opens the front camera in tablet. But in SAMSUNG GALAXY S II it opens the back camera. For this I searched in opencv.org forum and I got the following solution,</p> <pre><code> mCamera = new VideoCapture(Highgui.CV_CAP_ANDROID+1); </code></pre> <p>Now It opens the front camera in SAMSUNG GALAXY S II. But in the tablet I got <strong>"can't open camera"</strong> error. what may be the problem. And I tested with HTC desire android device. But it shows only blank screen(camera not opened). </p> <p><strong>The new requirement is the user hold with the position of camera in the top of the device. If they rotate the device the screen and image shouldn't rotate</strong>.</p> <p>It is very urgent. Please can someone help me to fix this?</p>
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