ut ut

Laboratory for Image & Video Engineering

Flicker Perception on Digital Videos at LIVE

Flicker perception on digital videos at LIVE is being conducted in collaboration with CPS (http://www.utexas.edu/cola/cps/).

The effect of eccentricity and spatiotemporal energy on motion silencing NEW!

  • Motion silencing is a peripheral effect that does not occur near the point of fixation. To better understand the effect of eccentricity on motion silencing, we measured the amount of motion silencing as a function of eccentricity in human observers using traditional psychophysics. Further, we modeled the response of a population of simulated V1 neurons to our stimuli. We suggest the plausible explanation that as eccentricity increases, the combined motion-flicker signal falls outside the narrow spatiotemporal frequency response regions of the modeled receptive fields, thereby reducing flicker visibility.

  •       L. K. Choi, A. C. Bovik, and L. K. Cormack, "The effect of eccentricity and spatiotemporal energy on motion silencing,"
          Journal of Vision., vol. 16, no. 5, pp. 1-13, Mar. 2016. (PDF)

LIVE Flicker Video Database NEW!

  • 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.

  •       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,"
          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,"
          Proc. IEEE 3rd Global Conf. Sig. and Inf. Process., Dec. 2015. (PDF)

Spatiotemporal flicker detector model of motion silencing

  • Motion can impair the perception of other visual changes. To understand why the visual system might be insensitive to changes in object luminances (‘flicker’) in the presence of object motion, we conducted human psychophysical experiments to examine motion silencing as a function of stimulus velocity, flicker frequency, and spacing; and we created a simple filter-based model as a working hypothesis of motion silencing.

  •       L. K. Choi, A. C. Bovik, and L. K. Cormack, "Spatiotemporal Flicker Detector Model of Motion Silencing,"
          Perception, vol. 43, no. 12, pp. 1286-1302, Dec. 2014. (PDF)
          L. K. Choi, A. C. Bovik, and L. K. Cormack, "A Flicker Detector Model of the Motion Silencing Illusion,"
          Journal of Vision, vol. 12, no 777. pp. 777, Aug. 2012. (Abstract)