2D plus Delta

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2D Plus Delta (also called 2D+Delta) is a method of encoding a 3D image and is listed as a part of MPEG2 and MPEG4 standards, specifically on the H.264 implementation of the Multiview Video Coding extension. This technology originally started as a proprietary method for Stereoscopic Video Coding and content deployment that utilizes the left or right channel as the 2D version and the optimized difference or disparity (Delta) between that image channel view and a second eye image view is injected into the video stream as user data, secondary stream, independent stream, enhancement layer or NALu for deployment. The Delta data can be either a spatial stereo disparity, temporal predictive, bidirectional, or optimized motion compensation.^[1]