Effect of scene dimensionality on colour constancy with real three-dimensional scenes and objects

Area of Science:

• Visual perception
• Color science
• Psychophysics

Background:

• Color constancy is the ability to perceive object colors as stable despite changes in illumination.
• Understanding factors influencing color constancy is crucial for visual science and artificial intelligence.
• Previous research has explored various cues, but the role of scene dimensionality remains debated.

Purpose of the Study:

• To investigate whether the dimensionality of a scene (three-dimensional vs. two-dimensional) affects color constancy.
• To determine if local spectral quantities are sufficient to explain color constancy under varying illuminations.

Main Methods:

• Participants viewed real three-dimensional (3-D) scenes or their two-dimensional (2-D) projections.
• A virtual test object (cube or 2-D projection) was integrated into the scene.
• Illumination of the scene and test object changed independently, and participants judged material changes.

Main Results:

• The dimensionality of the scene (3-D vs. 2-D) did not significantly influence the degree of color constancy observed.
• Color constancy varied significantly depending on the specific color of the test object.
• Results indicate that local spectral information may be a primary determinant of color constancy in these experimental conditions.

Conclusions:

• Scene dimensionality is not a critical factor for color constancy under the tested conditions.
• The color of the object itself appears to be a significant factor in achieving color constancy.
• Color constancy may rely more on local spectral properties than global scene structure.