View source for 2D plus Delta

{{distinguish|2D-plus-depth}}
{{Short description|Method of encoding 3D images listed as a part of MPEG2 and MPEG4 standards}}
{{One source|date=January 2025}}

'''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]].<ref>{{Cite patent|title=Method and device for delivering 3D content|country=EP|number=2724541|pubdate=2017-11-29|assign1=[[Technicolor_SA|Thomson Licensing DTV]]|inventor1-last=Xu|inventor1-first=Yan|inventor2-last=Du|inventor2-first=Lin|inventor3-last=Song|inventor3-first=Jianping}}</ref>

==Overview==
The technology was originally filed for world-wide intellectual property protection via [[WIPO]] in 2003. The patent statements were submitted to [[International Organization for Standardization|ISO]] in 2007, and listed as part of the MVC standard in 2008. The technology is now an open standard that is available for licensing and usage.{{cn|date=March 2022}}

The [[Multiview Video Coding|MVC initiative]] was started in June 2006.

The resulting video stream has the following characteristics:{{Citation needed|date=May 2011}}
* Contains the full information to reconstruct the Left and Right stereoscopic views in full resolution per eye
* Requires an additional average bandwidth ranging from 30% to 60% regarding a 2D only stream depending on the encoding implementation
* Can be deployed over existing pipelines, starting from 16&nbsp;Mbit/s for 1080p@60fps per eye
* One single video stream services both: 3D viewers and 2D Legacy users
* Can be seamlessly decoded by 2D legacy decoders in full 2D HD without the need for any change or additional hardware

2D Plus Delta has been listed at ISO/ITU/IEC/MPEG2/MPEG4/MVC initiatives.

* MPEG4 ISO/IEC 14496-10:2009
* MPEG4 ISO/IEC 14496-10:2008 - 07
* MPEG4 ISO/IEC 14496-10:2008/FDAmd 1 - 01
* MPEG4 ISO/IEC 14496-10:2008/FDAmd 1 - 02
* MPEG4 ISO/IEC 14496-15:2004/CD Amd 3 - 01
* MPEG4 ISO/IEC 14496-15:2004/CD Amd 3 - 02
* MPEG4 ISO/IEC 14496-4:2004/CD Amd 38 - 01
* MPEG4 ISO/IEC 14496-4:2004/CD Amd 38 - 02
* MPEG4 ISO/IEC 14496-5:2001/CD Amd 15 - 01
* MPEG4 ISO/IEC 14496-5:2001/CD Amd 15 - 02
* MPEG2 ISO/IEC 13818-1:2007/CD Amd 4 - 01
* MPEG2 ISO/IEC 13818-1:2007/CD Amd 4 - 02
* MPEG4 ISO/IEC 14496-10:2008 - 06
* MPEG4 ISO/IEC 14496-10:2008 - 07

There are two ways for [[stereoscopic]] 3D deployment of content to the home ([[3D television]]):
# Frame compatible: Pixel subsampling like Side by Side, Checkerboard, [[Quincunx]] and Color shifting like [[Anaglyph 3D|Anaglyph]]
# Enhanced Video stream Coding: [[2D+Delta]]/[[Multiview Video Coding|MVC]] and [[2D plus depth]]

== See also ==
* [[2D plus depth]]
* [[Multiview Video Coding]]
* [[Stereoscopic]]
* [[Anaglyph 3D|Anaglyph]]
* [[TDVision]]
* [[3DTV]]

== References ==
<references />

[[Category:Stereoscopy]]
[[Category:Graphics file formats]]