Image and video quality assessment

If you want to see our databases click here :

Databases

The IVC team has two psycho-visual test rooms in accordance with the international recommendations (ITU-R BT 500-11 for example). These recommendations allow to reproduce the tests all around the world like it have been done in Multi Media Test Plan of the Video Quality Expert Group (VQEG).

In this test rooms, we realize some psycho-visual measurements experiment like quality evaluation on still images or on videos with different formats and resolutions. These evaluations can be done by expert or non-expert people.

These rooms are used in a multimedia platform which have :

  • Multi protocol

A multi protocol platform allow to measure different feedbacks about the contents under test.

 
 

Some of them can be complementary to verify the results or to have another point of view.

Some methodologies allow to measure the absolute or relative quality.

Other methodologies allow to evaluate the perceptibility of an impairment.

In pair images, we can evaluated which one is the prefered image/video in term of quality, naturalness, luminosity point of view and so on. The power of the preference can also be evaluated.

 
  • Multi displays technology

Our multi display technology platform allow to measure the observer feedbacks with a protocol previously presented without any processing in the transmission channel.

There are different sizes, technologies and connections to choose the better solution according to the scenario.

This display diversity can be used to measure the impact of the display, with the realization of a test with several display.

An medical imaging system allow to realize some test with medical images, very high resolution images (up to 4096x2560 pixels) and High Dynamic Range images (up to 12 bits per pixels).

Before each test, all our displays are calibrated .

  • Multi player

A multi player platform allow to display images and videos from the QCIF (or less) resolution to Full HD resolution. The videos are played uncompressed (to manage what are displayed), in real-time up to Full HD (1920x1080 pixels) in progressive up to 60Hz.

This platform also allow to record, in the same time to play, Full HD uncompressed videos in real-time. Its allowing to play, to process and to record, all in the same time, videos in real-time up to HD resolution up to 60Hz.

 

 
  • Multi resolution (from mobile resolution like QCIF to Full HD)
  • Multi analysis method

After each test, an analysis is done. This analysis is composed by the general computation like the Mean Opinion Score, the Confidence Interval and the outlier. Our analysis are completed by some statistical analysis to know if there is difference between two processings or to transform the scale of the result to allow the comparison with other methods and so on.

This platform has two main functions :

  • Realization of the subjective tests
  • Dissemination of the results : the databases composed by the images/videos, the subjective scores and analysis are on line.

Realization of subjective tests :

The aims of the subjective test realization are :

  • Academic collaborationsThe academic collaborations can be done to evaluate a objective model on a specific database or to evaluate the difference between people around the world. Please see our publication with :
  • Consortium projectsThe IRCCyN laboratory/ IVC team participate to regional, national and international projects to provide its background in the image/video quality and to measure the efficiency of players, coders, displays or objective metrics with subjective tests, such as :
    • (FUI Image and media cluster)
    • HD4U (Eureka/ITEA, 2005-2007)
    • SCALIM@GES (FUI, Image and media cluster, 2006-2008)
    • FUTURIM@GES (FUI, Image and media cluster, 2007-2009)
    • PERSEE (ANR-white program)
    • ARCHIPEG (ANR, 2006-2009)
    • VQEG(Video Quality Expert Group)
  • Collaboration projectsCollaboration projects have been done with partners like :
    • ORANGE
    • ACREO
    • BT
    • TECHNICOLOR
    • TF1
  • Internal works It support the research of the IVC team on the psycho-visual domain.

We are open for collaboration. If you have some project, please contact us.

 

Technical Support : Romuald Pepion
Team : IVC
Link :

Databases

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