MC in 3DTV

ExpertiseVisual Media Quality

Visual Media Quality
Visual media is increasingly important with the growing number of visual terminals eg smartphones, tablets, flat panel TVs and 3D TV. This makes the quality that media is delivered with, combined with the quality of presentation device, that is, the experienced visual media quality very important. The technical area Visual Media Quality, is developing methods for measuring the experienced Visual Media Quality, both objective and subjective. The work covers both 2D and 3D media.

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RISE Acreo is one of the leaders in standardization of video and display quality for present and future broadband networks. We also offer controlled user studies media services covering both display and video quality as well as lighting measurements. Next generation screens with 3D presentations are also among our areas of expertise.

Standardization development for 3DTV

3D is now established at the movies and is more profitable than traditional 2D movies. The development for 3DTV has not been that successful yet. There could be several explanations to that. The current lack of content is probably one of them. Another is the lack of common agreed international standards. In this latter area. Acreo has since 2009 been involved in projects that have made important progresses for 3DTV standards, especially within the Video Quality Experts Group (VQEG, www.vqeg.org), but also in Moving Pictures Experts Group (MPEG, mpeg.chiariglione.org), International Committee for Display Metrology (ICDM, www.icdm-sid.org) and the TCO display certification (www.tcodevelopment.com).

Video quality tests

In the process MPEG has issued a call for proposal, which is a kind of competition to find the best performing compression algorithms for this purpose. In order to evaluate the performances of the submitted algorithm 3D video quality data was decided to be collected. Experiments with normal viewers were performed at laboratories all over the world. Acreo was one of 12 labs performing video quality tests. The test result indicates that a clear quality improvement was achieved by many proposals, as compared to earlier coding standards. A new video codec standard could be expected earliest in a couple of years.

Cooperation with TCO Development

One other project in this area that RISE Acreo has been involved in during 2011 is in the development of the visual ergonomic requirements for a new display label from TCO Development, targeting 3DTV. These are new products for the customers with new strength and weaknesses, for which the consumers do not yet have the experience to judge. One such parameter is crosstalk, which is the incomplete isolation between the left and right channels, with e.g. ghosting as a visible distortion. There are two competing technologies on the market for glasses based 3DTV i.e. passive polarized and active shutter glasses. A large effort has been put into evaluating their pros and cons. For example the passive technique may give lower experienced resolution whereas the active technique may cause visible flicker.

In addition to the above described projects Acreo has also been involved in 3DTV standardization work within the Video Quality Experts Group (VQEG) and the International Committee for Display Metrology (ICDM).

Kjell Brunnström, Acreo
kjell.brunnstrom [at] acreo.se

VQEG-meeting in Ghent, Belgium 8-11 July, 2013

Two main topics; the near completion of the Hybr-id/Bitstream project and the 3DTV project.

The latest meeting of the Video Quality Experts Group (VQEG, www.vqeg.org) was excellently arranged by the University of Ghent – iMinds in the beautiful and historic city of Ghent in Belgium, 8 – 12 July 2013. The meeting took place in a monastery (Monasterium PoortAckere, http://monasterium.be/index.php?taal=eng), which was a perfect location for a meeting in this historic city. There were in total 27 very active people participating during the week with a total of 45 submitted documents.Ghent

The meeting had a full five day agenda where the two main topics were the near completion of the Hybr-id/Bitstream project and the 3DTV project. The discussions were long and tough in the Hybrid/Bitstream project, which is typical when a project running towards the end, but decisions were made so that the project can move forward. A draft final report may be available at the next meeting.

For 3DTV a setback was that NTT has to withdraw its leadership of the competitive evaluation of 3D objective metrics. It still remains as project within 3DTV, but may lose some speed unless another strong driving force steps in. The subjective evaluation work has made plenty of progress and several interesting works were presented. It was also clear that the UltraHD project had a lot of interest, although relatively new within VQEG, but with this attention we could foresee plenty of progress in the near future. In the Audiovisual HD (AVHD) a new interesting subjective testing methodology were presented, that may change how the subjective testing is performed within VQEG. Two interesting points were to use longer video clips and distracting questions, where the main question is hidden among other, so the focus of test person will not be purely on the quality, but more focused on the main usage of the service. This should also be relevant for the newly started project within AVHD about adaptive streaming quality. The Monitoring of Audio Visual Quality by Key Indicators (MOAVI) reported progress on indicators, e.g. Blur and audio-visual synch, developed especially at AGH. In the JEG-Hybrid very large databases with distorted videos partly rated with full-reference objective metrics suitable for model development had been produces. The Real-Time Interactive Communications Evaluation (RICE) project presented results about the testing 3D video conference systemsthe VQEG Ghent team and a novel technique to evaluate the benefit of depth information in the system. Other points to note was that a project was started for gaming quality and an editor-group was formed for making a VQEG e-letter.

More about the recent progress within VQEG can be found in the progress report, which could also be found in the meeting files.
For more information about the meeting see http://www.its.bldrdoc.gov/vqeg/meetings/ghent,-belgium-july-8-12,-2013.aspx.

Interesting reading

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White paper about definition on quality of experinece.
http://www.qualinet.eu/images/stories/whitepaper_v1.1_dagstuhl_output.pdf

People

Börje Andrén
Senior Scientist
+46 (0)70 776 77 30
borje.andren [at] ri.se

Kjell Brunnström
Senior Scientist, Technical Area Manager Visual Media Quality
+46 (0)70 841 91 05
kjell.brunnstrom [at] ri.se

Anders Djupsjöbacka


anders.djupsjobacka [at] ri.se

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