Add gaussian noise filter on the android camera
<p>How can add a gaussian noise filter on the android camera? I have RGB through decoding YUV. After decoding with native functions I format the RGB matrix to Bitmap format and then :</p>

<p>Bitmap mBackBuffer</p>

<pre><code>@Override
public void onPreviewFrame(byte[] pData, Camera pCamera) {
    decode(mBackBuffer, pData);
    invalidate();
}

@Override
protected void onDraw(Canvas pCanvas) {
    if (mCamera != null) {
        // Draws resulting image at screen origin.
        pCanvas.drawBitmap(mBackBuffer, 0, 0, mPaint);
        // Enqueues buffer again to get next image.
        mCamera.addCallbackBuffer(mVideoSource);
    }
}
</code></pre>
