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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Published on: May 20, 2013

Luminance-based specular gloss characterization.

Frédéric B Leloup¹, Michael R Pointer, Philip Dutré

¹Light & Lighting Laboratory, Catholic University College Sint-Lieven, B-9000, Gent, Belgium. Frederic.Leloup@kahosl.be

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|June 7, 2011

Summary

This study reveals illumination conditions significantly impact gloss perception, challenging current glossmeters. A new metric combining surface and lighting properties offers improved gloss evaluation for high-gloss materials.

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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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Scanning Light Scattering Profiler (SLPS) Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses

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Published on: June 6, 2017

Area of Science:

Optics
Visual Perception
Materials Science

Background:

Gloss perception is influenced by surface properties and illumination.
Existing glossmeters struggle with accurate high-gloss surface evaluation due to illumination variability.
Understanding illumination's role is crucial for precise gloss measurement.

Purpose of the Study:

To investigate the influence of illumination conditions on specular gloss perception.
To develop a psychophysical model correlating visual gloss estimations with luminance.
To create a novel metric for enhanced gloss evaluation.

Main Methods:

Magnitude estimation experiment with 10 observers.
Utilized a light booth with two independently controlled light sources.
Derived a psychophysical scaling function relating visual gloss to luminance measurements.

Main Results:

A model was developed relating visual gloss to the luminance of the reflected image and background.
Validation experiment confirmed the model's generalization error.
A new metric incorporating both surface and illumination properties was established.

Conclusions:

Illumination conditions are critical factors in gloss perception.
The developed metric provides a more accurate method for evaluating high-gloss surfaces.
This research can lead to improved gloss evaluation instruments and methods.