Colourlab Workshop #1/2013: Recent progress in colour vision science

The workshop is open to GUC and Colourlab faculty and students and external participants. Although state of the art vision sciene research will be presented, the presenters are asked to focus on pedagogical aspects to an audience mainly from the colour imaging science and technology field.

09:00-09:45: Introduction to research at the Colourlab (for visitors), Dr. Marius Pedersen

10:00-10:45: Temporal integration of the chromatic channels in peripheral vision, Dr. Osamu Masuda

11:00-11:45: Noise in human colour vision (and elsewhere), Dr. José Medina

12:00-13:00: Lunch

Temporal integration of the chromatic channels in peripheral vision

Abstract:

There have been two conflicting hypotheses on the mechanism of color vision. One says that color and luminance are mediated by a common channel, and the other says that they are in separate channels. To test these hypotheses, the spatiotemporal properties of color vision in the peripheral visual field were investigated psychophysically. It was found that the chromatic responses are different depending on the combination of the stimuli, and a new color vision model that integrates the conventional two hypotheses is proposed.

Bio:

Osamu Masuda received his BS (1993) and MS (1995) in Information Engineering from Niigata University, Japan, and his PhD (2006) in Information Processing from the Tokyo Institute of Technology, Japan. He had been a researcher at Printing Bureau, Ministry of Finance, Japan (1995-2002). He was a postdoc in University of Rochester, USA (2006-9) and Mie University, Japan (2009-10). He is a postdoc in University of Minho, Portugal. His primary research interest is the psychophysics of human colour vision.

Noise in human colour vision (and elsewhere)

Abstract:

Noise is often considered a nuisance that limits informationtransfer and performance of linear systems. However, living systems are often non-linear and seem to be evolved in a way that exploit noise in a flexible and efficient way. In the present talk, I will review the fundamentals of noise from the physics point of view in multiple examples, with special emphasis to the brain and more specifically to the human visual system and possible benefits. Understanding the nature of noise in the brain has utility in the diagnosis of neural diseases and in the design of novel brain-machine interfaces.

Biography

José M. Medina received his PhD in physics in 2002 from the University of Granada, Spain. He has worked in the field of applied optics and in human color vision in topics such as in the study of chromatic-opponent mechanisms by using visual psychophysics and stochastic modeling by using statistical physics and information theory. As a color researcher, he has worked in the industry in topics such as in the design, production, and quality control of new color effects for automobiles and plastics based on the next generation of physical interference pigments; in the creation of computer color-matching databases for color recipes; and in the consecution of novel optical identification methods for interference pigments. His research interests include color vision, applied colorimetry,stochastic modeling, physics of color in thin films, and optical imaging of special effect pigments and structurally colored materials. His scientific production includes 26 peer-reviewed papers and conference proceedings. He is a member of the Optical Society of America and a review editor of the journal "Frontiers in Fractal Physiology".

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