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2D image and its depth map
2D image and its depth map, lighter depth map areas are regarded as closer to a viewer

2D-plus-Depth or also called 2D + Z format (not to be confused with 2D plus Delta or 2D-plus-DOT) is a Stereoscopic Video Coding format that is used for 3D displays, such as Philips WOWvx. Philips discontinued work on the WOWvx line in 2009, citing "current market developments".[1] Currently, this Philips technology is used by Dimenco company, led by former key 3D engineers and scientists of Philips. They offer autostereoscopic 3D displays which use the 2D-plus-Depth format for 3D video input.[2]

Overview[edit]

The 2D-plus-Depth format is described in a Philips' white paper[3] and articles.[4]

Each 2D image frame is supplemented with a greyscale depth map which indicates if a specific pixel in the 2D image needs to be shown in front of the display (white) or behind the screen plane (black). The 256 greyscales can build a smooth gradient of depth within the image. Processing within the monitor used this input to render the multiview images.

Supported by various companies across the display industry, 2D-plus-Depth has been standardized in MPEG as an extension for 3D filed under ISO/IEC FDIS 23002-3:2007(E).[5]

There is also an extension on the 2D-plus-Depth format called the WOWvx Declipse format. It is described in the same Philips' white paper "3D Interface Specifications". In this advanced format, two more planes are added to the original 2D image and its depth map for each frame: the background areas covered by foreground objects and their respective depth map. So, each frame in the Declipse format is described with an image containing four parts, or quadrants. This extension improves potential visual quality by providing data for more correct and precise filling of the uncovered occlusion areas created by shifting foreground objects during the multiview generation process.

Advantages[edit]

2D-plus-Depth has the advantage that it has a limited bandwidth increase compared to 2D (compressed greyscale increases bandwidth 5–20%) so that it can be used in existing distribution infrastructures.

2D-plus-Depth offers flexibility and compatibility with existing production equipment and compression tools.[6][7]

It allows applications to use different 3D display screen sizes and designs in the same system.

Another advantage is that depth maps are created in the course of 2D-to-stereo 3D conversion using almost any approach to this video transformation.[8] That is why there is the respective 2D-plus-Depth representation of a converted stereo footage in almost all cases. Considering the lack of 3D content shot in stereo and the number of converted 3D films, this is a big benefit.

Disadvantages[edit]

2D-plus-Depth is not compatible with existing 2D or 3D-Ready displays. The format has been criticized due to the limited amount of depth that can be displayed in an 8-bit greyscale.

2d-plus-Depth cannot handle* transparency (semi-transparent objects in the scene) and occlusion (an object blocking the view of another). The 2d plus DOT format takes these factors into account.[9] Additionally, it cannot handle reflection, refraction (beyond simple transparency) and other optical phenomena.

Creation of accurate 2D-plus-Depth can be costly and difficult, though recent advances in range imaging have made this process more accessible.[10][11]

2d-plus-Depth lacks the potential increase in resolution of using two complete images.

Depth cannot be reliably estimated for a monocular video in most cases. Notable exceptions are camera motion scenes when object motion is static or almost absent, and landscape scenes when depth map can be approximated well enough with a gradient. This allows automatic depth estimation.[12][13] In general case only semi-automatic approach is viable for 2D to 2D-plus-Depth conversion. Philips developed a 3D content creation software suite named BlueBox[14] which includes semi-automated conversion of 2D content into 2D-plus-Depth format and automatic generation of 2D-plus-Depth from stereo. A similar semiautomatic approach to high quality 2D to 2D-plus-Depth conversion is implemented in YUVsoft's 2D to 3D Suite, available as a set of plugins for After Effects and NUKE video compositing software.[15]

Stereoscopic to 2D-plus-Depth conversion involves several algorithms including scene change detection, segmentation, motion estimation and image matching. Automatic stereo to 2D+Depth conversion is now possible due to new high performance software and GPU technology, even in live real-time mode.[16]

Alternatives[edit]

Other 3D formats are stereo (left-right or alternating frames) and multiview 3D format (such as Multiview Video Coding and Scalable Video Coding), and 2D plus Delta.

References[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/2D-plus-depth — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

64 news items

 
PR Newswire (press release)
Fri, 24 Apr 2015 09:04:23 -0700

A 3D display exhibits images with depth perception through technologies such as stereoscopic, multi-view, and 2D-plus-depth displays. However, to experience depth perception, the images from 3D displays should be viewed with special 3D glasses.
 
HDTV Magazine
Sat, 26 Mar 2011 10:35:02 -0700

More interesting was that the 2D-plus-Delta format favored by the European broadcasters (and not adopted as 3DTV standard on phase 1 of the European's 3DTV implementation) was not even mentioned as an alternative, but rather the 2D-plus-Depth format ...

TechRadar UK

TechRadar UK
Tue, 18 Aug 2009 02:03:56 -0700

HDMI 1.4 defines several 3D formats for HDMI-enabled devices, including 'frame alternative', 'line alternative' and 'field alternative' methods, 'Side by side' methods (full and half) and '2D plus depth' methods. The new specification is also capable ...

Gizmag

Gizmag
Mon, 13 Apr 2009 00:00:00 -0700

In the 2D-plus-depth format, pixels are bundled with information that indicates their depth, using 256 grayscale shades. A microlens in front of the LCD panel then uses that information to provide nine different views for each pixel, projected to ...

Eurogamer.net

Eurogamer.net
Tue, 12 Oct 2010 05:39:20 -0700

TriOviz's technology is based on the concept of 2D plus depth, where individual viewpoints for each eye are separated out from a base 2D image based on the internal depth map used by the game engine in rendering the scene. The advantages of this style ...

Daily Mail

Daily Mail
Sat, 11 Aug 2007 14:41:31 -0700

Manufacturers are already developing the three-dimensional televisions and are convinced they will be the next generation of must-have sets. The new screens produce 2D plus depth. And while that is not pure 3D, it gives such a strong impression of ...

SlashGear

SlashGear
Thu, 05 Jun 2008 07:30:05 -0700

More importantly, it combines that with Philips 3D Solutions' WOWvx technology, described as a "2D-plus-Depth" format, which adds additional occlusion information into the picture to give the impression of being able to "look around" what's on-screen.

SlashGear

SlashGear
Thu, 19 Feb 2009 00:00:00 -0800

Built upon the Philips 3D Solutions, 2D Plus Depth format, the 3DF IP enhances and augments the 3D advancements to the point of achieving the first 3D Broadcast Ready, picture perfect standard for stereoscopic Glasses Free 3D displays. 3DFusion a key ...
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