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Remote effects of highlights on gloss perception
Julia Berzhanskaya1, Gurumurthy Swaminathan, Jacob Beck
1Department of Cognitive and Neural Systems, Boston University, Boston, MA 02215, USA. juliaber@cns.bu.edu
Perception
|July 5, 2005
Summary
Gloss perception in images depends on highlight proximity and surface continuity. Gloss ratings decrease with distance from highlights, influenced by surface shape rather than just luminance.
Area of Science:
- Computer vision
- Visual perception
- Surface reflectance
Background:
- Glossy surface perception in static images relies on highlights, shading, and contours.
- Image highlights can create an illusion of uniform surface reflectance, even when covering small areas.
Purpose of the Study:
- To investigate how gloss perception varies across different regions of a single object in an image.
- To determine the factors influencing non-uniform gloss perception, such as highlight distance and luminance.
Main Methods:
- Utilized a rating scale and probe points to assess gloss perception at specific image locations.
- Manipulated the relationship between highlight distance and luminance to isolate their effects on gloss ratings.
Main Results:
- Gloss ratings were not uniform across surfaces; they decreased with increasing distance from the highlight.
- The decrease in perceived gloss correlated more strongly with distance from the highlight than with changes in luminance.
- Perceived gloss was also influenced by estimated surface distance and surface continuity.
Conclusions:
- Gloss perception is spatially non-uniform and strongly influenced by the proximity to highlights.
- Surface geometry and continuity play a significant role in how gloss is perceived, indicating a link between surface and gloss processing.