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 The Stanford Center for Image Systems Engineering (SCIEN)

Developing imaging systems for the enhancement of human communication

 

 


Speaker: Professor Lorne Whitehead, University of British Columbia


Title: Improving the CIE Color Rendering Index - how this can be done and
why it matters


Date: February 21, 2012

 

Time: 4:15 pm to 5:15 pm

 

Location: Packard 204

 

Talk Abstract: The concept of color rendering of light sources is
surprisingly subtle and many find it difficult to fully understand. This
matters because there is an unavoidable trade-off between the color
rendering quality of light sources and their luminous efficacy - a fact that
has significant economic and social consequences. A related issue is that
recent human-factors research shows the current CIE Color Rendering Index
(CRI) does a poor job of assessing the colour rendering quality of the light
from many LEDs. We have found that at least part of the problem is
non-uniformity of the spectral sensitivity of the current CRI metric. We
have developed an improved computational procedure that eliminates that
problem, and numerous groups are now assessing it. The hope is that a better
measure of color rendering will assist researchers in establishing the
importance of lighting quality as opposed to quantity, in turn leading to
more pleasant and sustainable interior environments.

 

Speaker's Biography: Lorne A. Whitehead received a Ph.D. in physics from the
University of British Columbia and is a registered Professional Engineer.
His career has emphasized innovation in science, business, and
administration. From 1983 to 1993 he served as CEO of TIR Systems Ltd., a
university spin-off company that grew to 200 employees and was recently
purchased by Philips Corp. Since joining UBC in 1994, he has been a
Professor and held an NSERC Industrial Research Chair in the Department of
Physics and Astronomy, carrying out studies of the optical, electrical, and
mechanical properties of micro-structured surfaces, a field in which he
holds more than 100 patents. His technology is used in many computer screens
and televisions (via licenses to 3M and Dolby Laboratories) and he also
helped to start three other companies based on his research. In addition to
his scientific work at UBC, Dr. Whitehead has held a number of senior
university administrative positions.

 

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