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I thought I could get the data converted from the <code>SurfaceView</code>. But the best method to use is : <ul> <li>Set the camera's orientation to 90 degrees.</li> <li>Set output format to NV21 (which is <a href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html#setPreviewFormat%28int%29" rel="nofollow">guranteed</a> to be supported on all devices).</li> <li>Set to turn the Flash ON.</li> <li>Start preview in the <code>SurfaceView</code>.</li> </ul> List item <pre><code>camera = Camera.open(); cameraParam = camera.getParameters(); cameraParam.setPreviewFormat(ImageFormat.NV21); camera.setDisplayOrientation(90); camera.setParameters(cameraParam); cameraParam = camera.getParameters(); camera.setPreviewDisplay(surfaceHolder); cameraParam.setFlashMode(Parameters.FLASH_MODE_TORCH); camera.setParameters(cameraParam); camera.startPreview(); </code></pre> Then, I call the <code>setPreviewCallback</code> and <code>onPreviewFrame</code> to get the incoming frame, and convert it to RGB pixel array. Which I can then get intensity of each color in the picture by averaging all pixels intensity by running myPixels array through a <code>for</code> loop, and checking <code>Color.red(myPixels[i])</code> for each desired color (inside the <code>onPreviewFrame</code>). <pre><code>camera.setPreviewCallback(new PreviewCallback() { @Override public void onPreviewFrame(byte[] data, Camera camera) { int frameHeight = camera.getParameters().getPreviewSize().height; int frameWidth = camera.getParameters().getPreviewSize().width; // number of pixels//transforms NV21 pixel data into RGB pixels int rgb[] = new int[frameWidth * frameHeight]; // convertion int[] myPixels = decodeYUV420SP(rgb, data, frameWidth, frameHeight); } } </code></pre> Where <code>decodeYUV420SP</code> is found <a href="http://www.akeric.com/blog/?p=1342#viewSource" rel="nofollow">here</a>. I timed this operation to take about 200ms for each frame. Is there a faster way of doing it?
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