Modeling the Initial Steps of Human Vision

Hosted By: Color Technical Group

21 July 2020, 12:00 - 13:00 - Eastern Time (US & Canada) (UTC - 05:00)

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Vision guides thought and action. To do so usefully it must inform us about critical features of the world around us. What we can learn about the world is limited by the initial stages of visual processing. Physicists, biologists and psychologists have created quantitative models of these stages, and these models enable us to quantify the encoded information. We have integrated these models as image computable software: the Image Systems Engineering Toolbox for Biology (ISETBio). The software is an extensible set of open-source modules that model the three-dimensional scene spectral radiance, retinal image formation (physiological optics), spatial sampling by the cone photoreceptor mosaic, fixational eye movements, and phototransduction. This webinar, hosted by the OSA Color Technical Group, will provide an overview of the ISETBio modules as well as examples of how to use the software to understand and model human visual performance.

What You Will Learn:
How to use the ISETBio software tools (Matlab) to (1) Create a 3D spectral scene, (2) Compute the corresponding retinal irradiance of a scene, (3) Calculate photoreceptor excitations and photocurrent, (4) Model eye movements, and (5) Predict contrast and chromatic sensitivity.

Who Should Attend:
People interested in the properties of the initial visual encoding of light and in particular those who would like software tools to calculate the properties of the front end of the visual system.

About the Presenters: 

Brian Wandell, Stanford University

Brian A. Wandell is the Isaac and Madeline Stein Family Professor. He joined the Stanford Psychology faculty in 1979 and is a member, by courtesy, of Electrical Engineering, Ophthalmology, and Graduate School of Education. Wandell is the founding director of Stanford’s Center for Cognitive and Neurobiological Imaging, and the Deputy Director of the Stanford Neuroscience Institute. His research spans topics from color science, visual disorders, reading development, and algorithms for both magnetic resonance imaging and digital imaging. Wandell wrote the vision science textbook Foundations of Vision. In 2007 he was named Electronic Imaging Scientist of the Year by the SPIE/IS&T, and he was awarded the Tillyer Prize from the Optical Society in 2008. He was elected to the American Academy of Arts and Sciences in 2011. Oberdorfer Award from the Association for Research in Vision and Ophthalmology, 2012. Wandell was elected to the US National Academy of Sciences in 2003.


David Brainard, University of Pennsylvania

David H. Brainard is the RRL Professor of Psychology at the University of Pennsylvania. He received an AB in Physics (Magna Cum Laude) from Harvard University (1982) and an MS (Electrical Engineering) and PhD (Psychology) from Stanford University in 1989. His research focuses on color vision, intrinsically photosensitive retinal ganglion cells, retinal imaging, and well as computational models thereof. He is a fellow of the Optical Society, ARVO and the Association for Psychological Science. At present, he is the Associate Dean for the Natural Sciences in Penn's School of Arts and Sciences. He also directs Penn's Vision Research Center, is the President of the Vision Sciences Society, is an Associate Editor of the Journal of Vision, and is co-editor of the Annual Review of Vision Science.