A 3D video device (50) processes a video signal (41) that has at least a first image to be displayed on a 3D display. The 3D display (63) requires multiple views for creating a 3D effect for a viewer, such as an autostereoscopic display. The 3D video device has a processor (52) for determining a processed view based on the 3D image data adapted by a parameter for targeting the multiple views to the 3D display, and calculating a quality metric indicative of perceived 3D image quality. The quality metric is based on a combination of image values of the processed view and a further view. A preferred value for the parameter is determined based on repeatedly determining and calculating using different values. Advantageously, the quality metric predicts the perceived image quality based on a combination of image content and disparity.
