Abstract: Methods of encoding and decoding video data are provided. In an encoding method, source video data comprising one or more source views is encoded into a video bitstream. Depth data of at least one of the source views is nonlinearly filtered and downsampled prior to encoding. After decoding, the decoded depth data is up-sampled and nonlinearly filtered.

Abstract: An apparatus comprises a processor (301) providing a plurality of reference video streams for a plurality of reference viewpoints for a scene. A receiver (305) receives a viewpoint request from a remote client where the viewpoint request is indicative of a requested viewpoint. A generator (303) generates an output video stream comprising a first video stream with frames from a first reference video stream and a second video stream with frames from a second reference video stream. The frames of the second video stream are differentially encoded relative to the frames of the first video stream. A controller (307) selects the reference video stream for the first and second video streams in response to the viewpoint request and may be arranged to swap the reference video streams between being non-differentially encoded and being differentially encoded when the viewpoint request meets a criterion.

Abstract: An apparatus comprises a processor (301) providing a plurality of reference video streams for a plurality of reference viewpoints for a scene. A receiver (305) receives a viewpoint request from a remote client where the viewpoint request is indicative of a requested viewpoint. A generator (303) generates an output video stream comprising a first video stream with frames from a first reference video stream and a second video stream with frames from a second reference video stream. The frames of the second video stream are differentially encoded relative to the frames of the first video stream. A controller (307) selects the reference video stream for the first and second video streams in response to the viewpoint request and may be arranged to swap the reference video streams between being non-differentially encoded and being differentially encoded when the viewpoint request meets a criterion.

Abstract: 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.