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answered 2013-01-10 06:13:19 -0600
There is a similar code snippet in OpenCV tutorials. Based on Tutorial 1 I think that you should use Imgproc.COLOR_YUV420sp2RGB instead of Imgproc.COLOR_YUV2RGBA_I420.
Imgproc.COLOR_YUV420sp2RGB
Imgproc.COLOR_YUV2RGBA_I420