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

Shape from shading: estimation of reflectance map

J Seyama1, T Sato

  • 1Department of Psychology, Faculty of Letters, University of Tokyo, Japan. Lseyama@hongo.ecc.u-tokyo.ac.jp

Vision Research
|January 20, 1999
PubMed
Summary

This study estimated the visual system's reflectance map for shape from shading perception. Empirically derived maps accurately predicted perceived shapes, challenging prior claims of visual system inaccuracy.

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

Tilt dependency of slant aftereffect.

Vision research·2000
Same author

Relationship between inhibitor of extrathyroidal 5'-deiodinase activity and serum free fatty acid in children with nonthyroidal illness and acute ketosis.

Endocrinologia japonica·1992
Same author

Preferential activation of phospholipase A2 by low concentrations of phosphatidic acid with long-chain fatty acids in rabbit platelets.

Journal of biochemistry·1992
Same author

Innervation of an aberrant digastric muscle in the posterior thigh: stratified relationships between branches of the inferior gluteal nerve.

Journal of anatomy·1992
Same author

A simple stimulator for periodontal mechanoreceptors in human subjects.

Journal de biologie buccale·1992
Same author

Blockade of 2,4-dinitrophenol induced ATP sensitive potassium current in guinea pig ventricular myocytes by class I antiarrhythmic drugs.

Cardiovascular research·1992

Area of Science:

  • Vision science
  • Computational neuroscience
  • Perception psychology

Background:

  • The visual system infers 3D shape from 2D images using shading cues.
  • Previous research suggested inaccuracies in the visual system's internal reflectance map models.

Purpose of the Study:

  • To empirically estimate the reflectance map used in shape from shading perception.
  • To determine if these empirically derived reflectance maps can predict perceived shapes accurately.

Main Methods:

  • Experiment 1: Presented subjects with images of simple shapes (cylinder, sphere) and measured perceived 3D shape cross-sections.
  • Estimated reflectance maps from stimulus image intensities and perceived shape slants.
  • Experiment 2: Generated new stimulus images using the empirically derived reflectance maps.
  • Assessed if these new images led to accurate shape perception.

Main Results:

  • Empirically estimated reflectance maps did not conform to Lambertian reflectance properties.
  • Perceived shapes generated using the empirically derived reflectance maps closely matched the original stimulus shapes.
  • The visual system's shape-from-shading mechanism was accurately predictable using these empirical maps.

Conclusions:

  • The visual system's shape-from-shading perception can be explained by empirically derived reflectance maps.
  • This contradicts previous claims of inherent visual system inaccuracies in processing shading information.
  • The study provides a more accurate model for understanding 3D shape perception from visual cues.

Related Experiment Videos