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MSU Graphics & Media Lab Report #6 on stereo films quality assessment

One of the common issues with stereo 3D (S3D) movies is the presence of stereo-window violations. A stereo-window violation can be defined as a contradiction between two different depth cues where an object on the side of the image is partly hidden by a border of the frame but, owing to its parallax, appears closer than the border (Image #1). As with other contradictions, this situation can cause serious discomfort because it almost never occurs under viewing conditions in a real environment. However, it often receives surprisingly little attention during both production and screening of S3D movies. The Graphics & Media Lab CMC of Lomonosov Moscow State University decided to investigate this problem.


Image #1: Example of a stereo-window violation

(Image source: http://www.compression.ru/ video/vqmt3d/press-releases/report6/ images/image1.gif)


Image #2: Example of a stereo-window violation fixed by means of the floating window technique
(Image source: http://www.compression.ru/ video/vqmt3d/press-releases/report6/ images/image2.gif)

In most cases the stereo-window violation issue can be fixed by means of the floating-window technique. A floating window is simply a black stripe added to the edge of one of the views to cover window-violating content (Image #2). A lot of different strategies can be employed in using this technique, including static, dynamic, slant or even curved floating windows (Images #3-5)


Image #3: Example of a slant floating window
(Image source: http://www.compression.ru/ video/vqmt3d/press-releases/report6/ images/image3.gif)


Image #4: Example of a curved floating window
(Image source: http://www.compression.ru/ video/vqmt3d/press-releases/report6/ images/image4.gif)


Image #5: Example of a dynamic floating window
(Image source: http://www.compression.ru/ video/vqmt3d/press-releases/report6/ images/image5.gif)

The sixth report is dedicated to the analysis of stereo-window violation issue and use of floating windows in various S3D movies. It addresses 10 different S3D films, both natively captured and post-converted:

The report presents per-frame charts that enable the analysis of floating window behaviour with respect to disparity of the closest object near the edge of the frame (Image #6). The charts are accompanied by visualizations of the most noticeable window violations.


Image #6: Example of a per-frame analysis chart
(Image source: http://www.compression.ru/video/vqmt3d/press-releases/report6/images/image6.png)

The report also presents an overall comparison of films in terms of quality of stereo window violation handling.

One may notice that more recent movies tend to have better stereo-window violation handling (Image #7)


Image #7: Stereo Window Violation vs. Release Date
(Image source: http://www.compression.ru/video/vqmt3d/press-releases/report6/images/image7.png)

Naturally, films with heavy use of floating windows tend to have less stereo-window violations. However, some films achieve low stereo-window violation number with virtually no floating windows across the whole film (Image #8)


Image #8: Stereo Window Violation vs. Floating Window Usage Intensity
(Image source: http://www.compression.ru/video/vqmt3d/press-releases/report6/images/image8.png)

This fact can be explained by looking at the average disparities of the closest object near the edge of the screen (Image #9). In fact, The Three Musketeers has the highest average positive disparity value, indicating that, indeed, floating windows are not required to achieve low stereo window violation level in this film.


Image #9: Stereo Window Violation vs. Closest Object Disparity
(Image source: http://www.compression.ru/video/vqmt3d/press-releases/report6/images/image9.png)

Acknowledgements

We would like to thank the following people for providing valuable comments, opinions and feedback, which helped to improve this report:

A key motive of our reports is to improve the stereo quality and therefore to reduce eyestrain and headache. The Graphics & Media Lab hopes that a high 3D video quality would contribute to a continually increasing number of people, leaving the modern theaters without annoyance and with good impressions from the image quality and storytelling.

We are always interested in feedback from professionals in film-production industry. We have already collaborated with more than 20 stereographers who provided us valuable comments which were inserted in our reports. If you would like to participate in the next reports, please feel free to contact us: 3dmovietest@graphics.cs.msu.ru.

For press

Reports overview

Stereo-analysis project description

Report 1 (S3D shooting quality analysis of 5 movies)

Release date: March 7, 2013

Download (Additional info for bloggers and press)

Pages: 246;   Figures: 295

Film list:

  • Pirates of the Caribbean: On Stranger Tides
  • Resident Evil: Afterlife
  • Step Up 3D
  • Galapagos: The Enchanted Voyage
  • Into the Deep

Film list:

  • Dolphin Tale
  • Drive Angry
  • Hugo
  • The Three Musketeers
  • Sanctum

Film list:

  • Alice in Wonderland
  • Clash of the Titans
  • Conan the Barbarian
  • Green Lantern
  • Abraham Lincoln: Vampire Hunter

Report 4 (S3D shooting quality analysis of 5 movies)

Release date: October 1, 2013

Download

Pages: 301;   Figures: 402

Film list:

  • A Very Harold & Kumar 3D Christmas
  • Pina
  • Step Up Revolution
  • Resident Evil 5: Retribution
  • The Amazing Spider-Man

Film list:

  • The Avengers
  • The Chronicles of Narnia: The Voyage of the Dawn Treader
  • Gulliver’s Travels
  • Immortals
  • Wrath of the Titans

Report 6 (Stereo Window analysis of 10 movies)

Release date: September 10, 2014

Download (Additional info for bloggers and press)

Pages: 415;   Figures: 455

Film list:

  • The Amazing Spiderman
  • The Three Musketeers
  • Pirates of the Caribbean: On Stranger Tides
  • Dolphin Tale
  • Drive Angry
  • The Avengers
  • John Carter
  • G-Force
  • Abraham Lincoln: Vampire Hunter
  • Clash of the Titans

Report 7 (Stereo Window analysis of 10 movies)

Release date: October 22, 2014

Download (Additional info for bloggers and press)

Pages: 333;   Figures: 348

Film list:

  • Pina
  • Step Up Revolution
  • Resident Evil: Retribution
  • Hugo
  • Immortals
  • A Very Harold & Kumar 3D Christmas
  • Green Lantern
  • Conan the Barbarian
  • Wrath of the Titans
  • Alice in Wonderland

Film list:

  • A Very Harold & Kumar 3D Christmas
  • Abraham Lincoln: Vampire Hunter
  • The Avengers
  • Alice in Wonderland
  • Conan the Barbarian
  • The Chronicles of Narnia: The Voyage of the Dawn Treader
  • Clash of the Titans
  • Drive Angry
  • Dolphin Tale
  • Galapagos: The Enchanted Voyage
  • Green Lantern
  • Gulliver's Travels
  • Hugo
  • Immortals
  • Into the Deep
  • Pirates of the Caribbean: On Stranger Tides
  • Pina
  • Resident Evil: Afterlife
  • Resident Evil: Retribution
  • Sanctum
  • Step Up 3D
  • Step Up Revolution
  • The Amazing Spider-Man
  • The Three Musketeers
  • Wrath of the Titans

Report 9 (Temporal Shift, Stuck-to-Background Objects, 2D to S3D conversion in Captured Films)

Release date: January 18, 2017

Download (Additional info for bloggers and press)

Pages: 467;   Figures: 529

Over 100 films are in film list, including:

  • Creature from the Black Lagoon (1954)
  • World War Z (2013)
  • Dredd (2012)
  • Thor (2011)
  • The Hobbit: An Unexpected Journey (2012)
  • Life of Pi (2012)
  • Oz the Great and Powerful (2013)
  • The Legend of Hercules (2014)
  • Men in Black 3 (2012)
  • Dial M for Murder (1954)
  • Pirates of the Caribbean: On Stranger Tides (2011)
  • The Last Airbender (2010)
  • TRON: Legacy (2010)
  • Jack the Giant Slayer (2013)
  • The Great Gatsby (2013)
  • Pacific Rim (2013)
  • The Avengers (2012)

Report 10 (Overall analysis of 105 movies)

Approximate release date: 2nd-3rd quarter of 2017

The film list includes 105 movies


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Last updated: 08-September-2014

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