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Laboratory for Image & Video Engineering

Welcome to the LIVE Public-Domain Subjective Flicker Video Database

LIVE Flicker Video Database

Introduction

Understanding how humans perceive video distortions is important for developing video quality assessment algorithms, since humans are the ultimate arbiter of digital videos. Flicker is a particularly annoying occurrence, which can arise from a variety of distortion processes. Yet flicker can also be strongly suppressed by the perceptual phenomenon of visual masking. We have developed a new LIVE Flicker Video Database that studies the motion silencing effects on the visibility of flicker distortions in naturalistic videos. LIVE Flicker Video Database includes the human subjective scores on flicker visibility as a function of object motion, eccentricity, flicker frequency, and video quality with eye tracker data. The new LIVE Flicker Video Database consists of 72 test videos created from 6 RAW HD reference videos obtained using a RED ONE digital cinematographic camera*. Phase 1 investigates motion influences on the visibility of flicker distortions, while Phase 2 examines the effect of eccentricity on flicker visibility. * "Tractor" content video was obtained from Technical Univ. of Munich.

Phase 1: Motion effects on flicker visibility.
Phase 2: Eccentricity and motion effects on flicker visibility.

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We are making the LIVE Flicker Video Database available to the research community free of charge. If you use this database in your research, we kindly ask that you reference our papers listed below:

  • L. K. Choi, L. K. Cormack, and A. C. Bovik, "Motion silencing of flicker distortions on naturalistic videos," Signal Process. Image Commun., vol. 39, pp. 328-341, Mar. 2015. (PDF)
  • L. K. Choi, L. K. Cormack, and A. C. Bovik, "LIVE Flicker Video Database," Online: http://live.ece.utexas.edu/research/quality/live_flicker_video.html, 2015.
  • L. K. Choi, L. K. Cormack, and A. C. Bovik, "On the visibility of flicker distortions in naturalistic videos," in Proc. IEEE Int. Workshop Qual. Multimedia Exper., Jul. 2013, pp. 164-169. (PDF)
  • L. K. Choi, L. K. Cormack, and A. C. Bovik, "Eccentricity effect of motion silencing on naturalistic videos," in Proc. IEEE 3rd Global Conf. Sig. and Inf. Process., Dec. 2015. (PDF)

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Database Description

The goal of our study was to develop a database of videos that will understand the human percept on flicker distortions in real-world, naturalistic videos. The LIVE Flicker Video Database consists of 6 RAW HD reference videos and 72 test videos. Quantization flicker was simulated by periodic changes of video frames using H.264 compression by varying the QP values and by varying flicker frequencies. Each video was assessed in a single-stimulus continuous quality evaluation (SSCQE) with hidden reference.

  • Phase 1: Motion effects on flicker visibility.
    • - 43 subjects.
    - 36 videos: 6 content × (5 flicker videos + 1 no flicker compressed video); 3 flicker videos caused by periodic quality level changes (from QP44 to QP26, from QP38 to QP26, or from QP32 to QP26) at 5Hz flicker frequency + 3 flicker videos caused by quality level changes between QP38 and QP26 at flicker frequencies 7.5Hz, 5Hz, or 3Hz. Flickers are simulated on the entire frame.
    - 2 tasks: "follow the moving object" and "view freely."

  • Phase 2: Eccentricity and motion effects on flicker visibility.
    • - 33 subjects.
    - 36 videos: 6 content × (5 flicker videos + 1 no flicker compressed video); 3 flicker videos caused by periodic quality level changes (from QP50 to QP26, from QP47 to QP26, or from QP44 to QP26) at 5Hz flicker frequency + 3 flicker videos caused by quality level changes between QP47 and QP26 at flicker frequencies 7.5Hz, 5Hz, or 3Hz. Flickers are simulated only on small target area (within 1.5º of visual angle from the target center) of the moving object.
    - 2 tasks: "gaze the fixation mark" and "follow the moving object."

Investigators

The investigators in this research are:

Copyright Notice

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Copyright (c) 2015 The University of Texas at Austin
All rights reserved.

Permission is hereby granted, without written agreement and without license or royalty fees, to use, copy, modify, and distribute this database (the images, the results and the source files) and its documentation for any purpose, provided that the copyright notice in its entirety appear in all copies of this database, and the original source of this database, Laboratory for Image and Video Engineering (LIVE, http://live.ece.utexas.edu ) at the University of Texas at Austin (UT Austin, http://www.utexas.edu ), is acknowledged in any publication that reports research using this database.

The following papers are to be cited in the bibliography whenever the database is used as:

  • L. K. Choi, L. K. Cormack, and A. C. Bovik, "Motion silencing of flicker distortions on naturalistic videos," Signal Process. Image Commun., vol. 39, pp. 328-341, Mar. 2015. (PDF)
  • L. K. Choi, L. K. Cormack, and A. C. Bovik, "LIVE Flicker Video Database," Online: http://live.ece.utexas.edu/research/quality/live_flicker_video.html, 2015.
  • L. K. Choi, L. K. Cormack, and A. C. Bovik, "On the visibility of flicker distortions in naturalistic videos," in Proc. IEEE Int. Workshop Qual. Multimedia Exper., Jul. 2013, pp. 164-169. (PDF)
  • L. K. Choi, L. K. Cormack, and A. C. Bovik, "Eccentricity effect of motion silencing on naturalistic videos," in Proc. IEEE 3rd Global Conf. Sig. and Inf. Process., Dec. 2015. (PDF)

IN NO EVENT SHALL THE UNIVERSITY OF TEXAS AT AUSTIN BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS DATABASE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF TEXAS AT AUSTIN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

THE UNIVERSITY OF TEXAS AT AUSTIN SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE DATABASE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF TEXAS AT AUSTIN HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

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