<p>An image processing apparatus receives a base video stream and an enhancement video stream that contains information for optionally improving a quality of an output stream derived from the base video stream. An adder ( 126 ) forms an output stream by adding image information values derived for a location in an image from the base video stream and the enhancement video stream. A multiplier ( 124 ) coupled between the input and the adder adjusts a relative weight with which the information value in the base video stream and the enhancement video stream are added to each other. A weight selection unit ( 123 ) selects the relative weight as a function of position in the image and/or time in the video information, adaptive to local content of the video information.</p>
