Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Matching illumination of solid objects.

Sylvia C Pont1, Jan J Koenderink

  • 1Helmholtz Institute, Department of Physics and Astronomy, Utrecht University, Utrecht, The Netherlands. s.c.pont@phys.uu.nl

Perception & Psychophysics
|August 4, 2007
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Guest Editorial: The Beauty and the Beast.

Perception·2025
Same author

Bicyclopic Idomenian vision.

Perception·2025
Same author

The well-tempered color circle: A chromatic Gestalt.

i-Perception·2024
Same author

"Warm," "cool," and the colors.

Journal of vision·2024
Same author

Time-of-day perception in paintings.

Journal of vision·2024
Same author

What is "perception research" anyway?

Perception·2023
Same journal

Response organization in selective adaptation to speech sounds.

Perception & psychophysics·2014
Same journal

Reaction times to comparisons within and across phonetic categories.

Perception & psychophysics·2012
Same journal

Auditory and phonetic memory codes in the discrimination of consonants and vowels.

Perception & psychophysics·2012
Same journal

Simple and contingent adaptation effects for place of articulation in stop consonants.

Perception & psychophysics·2012
Same journal

Auditory property detectors and processing place features in stop consonants.

Perception & psychophysics·2012
Same journal

Visual working memory for line orientations and face identities.

Perception & psychophysics·2008
See all related articles

Human perception of object appearance helps infer light field properties. Studies show observers can match illumination direction and beam directedness, though accuracy varies with object properties and light diffusion.

Area of Science:

  • Computer vision
  • Human perception
  • Computational imaging

Background:

  • Object appearance depends on surface properties (reflectance, roughness) and the light field.
  • Inferring light field properties from object appearance is an inverse problem with potential perceptual ambiguities.
  • Perceptual interactions between reflectance, roughness, and light field are expected.

Purpose of the Study:

  • To investigate human observers' ability to match illumination direction and beam directedness.
  • To assess how object properties and illumination conditions affect illumination matching accuracy.

Main Methods:

  • Two experiments were conducted using rendered and real objects (spheres).
  • Observers matched illumination direction under collimated light.

Related Experiment Videos

  • Observers matched illumination direction and beam directedness under varying diffuse illumination.

    • Main Results:

    • Observers accurately matched collimated illumination directions for Lambertian spheres.
    • Matching real objects' collimated beam directions showed similar azimuthal but higher polar angle variance.
    • Translucent objects and a tennis ball were outliers; diffuse illumination increased direction variance and directedness settings interacted with polar angle.

    Conclusions:

    • Human observers can infer illumination direction and directedness from object appearance, with varying accuracy.
    • Object properties like translucency and surface texture influence illumination perception.
    • The findings suggest complex photometrical mechanisms underlying human light field perception.