Forecasting of viewers’ discomfort

Introduction

Nowadays, numerous movies are produced in stereoscopic format. Despite the development of stereoscopic movie production, stereoscopic artifacts causing discomfort right up to headaches continue to appear even in high-budget movies.

In this study, the influence of geometric, color and temporal artifacts was examined.

Distortions

Experiments

In a series of experiments, participants were asked to evaluate the level of discomfort while watching a specially prepared stereoscopic video. Over 300 people took part.

Experiment comparison

University #subjects #subjects per video Duration #videos #videos per test #scores Year 3D tech. Stimuli
University of Surrey 30 30 25 40 40 1200 2010 Autostereo. Synthetic S3D seq., encoding with different QP
Catholic University of Korea 20 20 18 36 36 720 2011 Passive Captured S3D seq., different parallax and motion
Telecom Innovation Labs 24 24 50 64 64 1536 2011 Active Open S3D DB, different parallax
Philips Research Labs 24 24 24 7 7 168 2011 Autostereo. 3D movie (converted), different parallax
Beijing Institute of Ophthal. 30 30 30 1 1 30 2012 Active+passive 3D movie (captured)
LUNAM University 29 29 28 110 110 3190 2012 Active Open S3D DB (NAMA3DS1-COSPAD1),
different degradations
Yonsei University 28 28 29 110 110 3080 2013 Passive Open S3D DB,10 degradation types
Acreo Institute 48 28 29 110 110 5280 2013 Passive Open S3D DB,10 degradation types
Tampere University of Tech. 10 10 45 40 40 400 2013 Passive Captured S3D seq., encoding with different QP
Roma Tre University 854 43-255 90 - 1 854 2014 Passive Screening after watching S3D movies in cinemas
Yonsei University 56 56 10.5 30.1 31 1736 2014 Autostereo. Open S3D DB, different SI and TI
University College Dublin 40 4 5.5 25.11 33 1320 2015 Active Open S3D DB, packet losses
University of British Columbia 88 88 48 208 208 18304 2015 Passive Open S3D DB, different SI/TI and compression degradations
University North 146 18 8 184 26 146 2016 Active Open S3D DB, 22 degradation types
(packet losses, encoding, resizing,
disparity, brightness, geometry etc.)
University of Coimbra 35 2-6 7-1 184 26 146 2016 Active Open S3D DB, 22 degradation types
(packet losses, encoding, resizing,
disparity, brightness, geometry etc.)
Lomonosov MSU 302 370 40 60 60 22200 2017 Passive Scenes from 3D movies (captured), 4 types of S3D distortions,
5 intensities

Experiment process

Experiment process

Experiment process

Experiment process


Discomfort level sorted by mean discomfort (red for high)

Experiment results

Here “C” is the color mismatch between stereoscopic views, “R” is the rotation mismatch, “T” is the temporal shift and “S” is the scale mismatch. The distortion intensity is indicated by numbers from 0 to 4, where 0 corresponds to the absence of distortion (the original scene was demonstrated).

To solve the problem of assessing the discomfort level, we used machine learning algorithms on the processed experimental data. More than 30,000 configurations were tested on the obtained stratified cross-validation dataset.

The best result was shown by a linear regression model with the Huber loss function and L2–regularization.

Results

The proposed models were applied to evaluate 60 stereoscopic movies.

The predicted level of discomfort that viewers may experience and the predicted percentage of viewers who will probably feel the discomfort while watching the analyzed movies are illustrated below:

Level of discomfort

Percentage of viewers

Dataset

Dataset consists of 60 video fragments that have been viewed and evaluated by two group of people:

  • First group - 302 people (denotes as p-13)
  • Second group - 10 people (denotes as 702)

p-13 folder consists of:

  • File with viewing order (direct and backward)
  • 60 subfolders, each contains video fragment, it's grade and information about distortions in the video

702 folder has the same structure except of video fragments itself, because they duplicate fragments of p-13

Downloads

IC3D Paper (2017)

Accepted version of the paper: Download

Dataset: Download

Reference

Citation A. Antsiferova, D. Vatolin. “The influence of 3D video artifacts on discomfort of 302 viewers”. 2017 IEEE International Conference on 3D Immersion (IC3D). pp. 1-8.

Bibtex

    @inproceedings{antsiferova2017influence,
    title={The influence of 3D video artifacts on discomfort of 302 viewers},
    author={Antsiferova, Anastasia and Vatolin, D},
    booktitle={2017 International Conference on 3D Immersion (IC3D)},
    pages={1--8},
    year={2017},
    organization={IEEE}
    }
07 May 2021
See Also
MSU Video Quality Measurement Tool: Picture types
VQMT 13.1 Online help: List of all picture types available in VQMT and their aliases
SAVAM - the database
During our work we have created the database of human eye-movements captured while viewing various videos
MSU Video Quality Measurement Tool: Usage of VQMT metrics in CLI
VQMT 13.1 Online help: Description of VQMT metrics, their parameters and using in CLI
MSU Video Quality Measurement Tool: VQMT various lists and tables
VQMT 13.1 Online help: Information about VQMT visualization formats, read modes, etc...
MSU Video Quality Measurement Tool: Command-line help
VQMT 13.1 Online help: Information about all VQMT CLI options for Pro/Premium versions
MSU Video Quality Measurement Tool: Configuration description
VQMT 13.1 Online help: Description of the format of the VQMT configuration file
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