Diffuse illumination as a default assumption for shape-from-shading in the absence of shadows

Christopher W. Tyler

doi:10.1117/12.274530

3 June 1997 Diffuse illumination as a default assumption for shape-from-shading in the absence of shadows

Christopher W. Tyler

Proceedings Volume 3016, Human Vision and Electronic Imaging II; (1997) https://doi.org/10.1117/12.274530
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

Radial sinusoids (blurry spoke patterns) appear dramatically saturated toward the brighter regions. The saturation is not perceptually logarithmic but exhibits a hyperbolic (Naka- Rushton) compression behavior at normal indoor luminance levels. The object interpretation of the spoke patterns was not consistent with the default assumption of any unidirectional light source, but implied a diffuse illumination (as if the object were looming out of a fog). The depth interpretation was consistent with the hypothesis that the compressed brightness profile provided the neural signal for perceived shape, as an approximation to computing the diffuse Lambertian illumination function for this surface. The surface material of the images was perceived as non-Lambertian to varying degrees, ranging from a chalky matte to a lustrous metallic.

Citation Download Citation

Christopher W. Tyler "Diffuse illumination as a default assumption for shape-from-shading in the absence of shadows", Proc. SPIE 3016, Human Vision and Electronic Imaging II, (3 June 1997); https://doi.org/10.1117/12.274530

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available