Luminance edge is a cue for glossiness perception based on low-luminance specular components

Area of Science:

• Visual perception
• Computational vision
• Psychophysics

Background:

• The visual system uses image cues to perceive object glossiness.
• Dark gloss perception, glossiness perceived without specular highlights, relies on low-luminance specular components.
• The prevalence and visual cues for dark gloss remain unclear.

Purpose of the Study:

• To investigate the commonality of dark gloss perception across various objects.
• To identify image features that serve as cues for dark gloss.
• To determine the relationship between image features and perceived dark gloss.

Main Methods:

• Psychophysical experiments were conducted using computer-generated object images.
• Perceived glossiness was measured for images with full specular reflections and those lacking high-luminance components (dark condition).
• Image features (luminance edge number, reflection recognizability, highlight features) were measured and analyzed using multiple regression.

Main Results:

• Dark gloss perception was observed in most tested object images, though intensity varied.
• Multiple regression analysis revealed a strong relationship between luminance edge number and glossiness scores.
• This relationship was particularly evident for images exhibiting strong dark gloss.

Conclusions:

• Dark gloss is a widespread phenomenon in visual perception.
• Luminance edges are identified as a significant cue for dark gloss perception.
• The effectiveness of luminance edges as a cue is dependent on specific stimulus conditions.