PSYC 380 Lecture Notes - Lecture 6: Supreme Headquarters Allied Powers Europe, Color Constancy, Relative Luminance

• School: Queen's University
• Department: Psychology
• Course: PSYC 380
• Professor: Niko Troje

Document Summary

Lightness constancy and its connection to colour constancy. Craik-o"brian-cornsweet illusion and knill & kersten"s demonstration how it can be influenced by high-level knowledge. Photometric vs radiometric measures and the luminous efficiency function. Illuminance, reflectance, luminance, radiance, irradiance, luminous efficiency function, chromaticity, luminance. Most important thing is reflectance, the less important are illumination and transparency. Illumination changes only smoothly: only certain illuminations are likely (illu(cid:373)i(cid:374)atio(cid:374)s are(cid:374)"t ar(cid:271)itrar(cid:455)(cid:895, reflectance spectra are generally smooth, transparency of a material is constant, changes in illumination and transparency retain contrast. The ability to recognize a surface from its reflectance properties despite changing illumination. But how do we achieve this: low levels- retinal processing, mid level, high level. Change over time: remember the view of your retinas blood vessels and why you could see them at all, on and off ganglion cells, physiological nystagmus (tremor, adaptation (motion, colour, spatial frequency, etc. )