Scott Daly
IEEE Circuits and Systems Society joint Chapter of the Vancouver/Victoria Sections
Interdisciplinary Research in the Mathematical and Computational Sciences (IRMACS) Centre, SFU

Mr. Scott Daly
Dolby Laboratories, Vancouver, BC

Title: Motion Perception in Displays

(Presentation is available in pdf format.)

Tuesday, October 25, 2011 (updated)
3:30 pm to 4:30 pm (updated)
ASB 10900 (IRMACS Presentation Studio), Simon Fraser University, Burnaby, BC, Canada


This talk will begin by covering the basics of Liquid Crystal Displays (LCDs) as applied toward television, referred to as LCTV. After setting the foundation for several dimensions of image quality such as spatial, color, temporal, and dynamic range, as well as the corresponding human visual system capabilities along those dimensions, the tutorial will focus in on the main problem that has hindered the LCTV: motion.
Since their introduction, LCDs were known for having a slower and asymmetrical temporal response compared to CRTs, which led to motion blur and flicker, respectively. For many years this hindered the use of LCD technology for television. Improving the temporal response time and the use of digital overdrive techniques led to a substantial reduction in motion blur. Still, some residual blur was visible in panned textures and scrolling text. Further analysis considering human visual system smooth pursuit eye tracking combined with the hold-type temporal aperture used with LCTV has identified the remaining sources of blur. New techniques such as backlight flashing, black data insertion, and frame rate conversion reduce the motion blur to that of CRT levels. However, the CRT is not necessarily the ultimate benchmark, as it suffers from other motion artifacts, especially with slow velocities. This talk will describe the key spatiotemporal properties of the visual system relevant to motion blur, and the various approaches used in LCTV technology toward improving overall moving picture sharpness.

Biography Scott Daly received a B.S. EE degree in 1980 from North Carolina State University, and then worked for a number of years with early high-resolution laser scanning systems at Photo Electronic Corporation in West Palm Beach, Florida. Shifting from hardware to wetware, he obtained an M.S. in Bioengineering from the University of Utah in 1984, where he was engaged in retinal neurophysiology, completing a thesis on the temporal information processing of cone photoreceptors. He then worked from 1985 to 1996 in the Imaging Science Division at Eastman Kodak in the fields of image compression, image fidelity models, and image watermarking. The years 1996-2010 were spent at Sharp Laboratories of America in Camas, Washington, where he led a group on display algorithms. Eventually becoming a research fellow and leader of the Center for Displayed Appearance, he had opportunities to apply visual models towards digital video and displays, with numerous publications on spatiotemporal and motion imagery, including starts in human interaction with wall-sized displays, audio perception and stereoscopic displays. These topics led him to recently join Dolby Laboratories in 2010 to focus on overall fundamental perceptual issues, and toward applications whose aim is to preserve artistic intent throughout the entire video path to reach the viewer. He is currently a member of IEEE, SPIE, and SID.

Last updated 
Thu Oct 27 02:40:18 PDT 2011.