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Kinect color (rgb) noisy images

i'm using opencv interface ( to get color (rgb) and depth frames from a kinect camera. For a standard VGA 640x480 resolution and with code like

capture.retrieve( bgrImage, OPENNI_BGR_IMAGE );

i get this :

I think this is really noisy. Is this normal quality for a kinect rgb camera? I tried various filtering (blurring, sharpening, opening..) procedures but i got minor improvements.