The Ability of a Color Appearance Model to Predict the Appearance of Colors Viewed through Laser Eye Protection Filters
Abstract
The International Commission for Illumination (CIE) Color Appearance Model 2002 (CIECAM02), through its inverse transform, allows for the visualization of the effects on color appearance of factors such as changing lighting conditions or wearing colored filters. Since some colored filters, such as laser eye protection (LEP), block significant portions of the visible spectrum, we were interested in determining if the model could accurately predict the color appearance changes caused by such extreme filtering. An additional goal was to validate a software implementation of the model. Three psychophysical tasks: rating, ranking, and color matching were used to evaluate the model predictions for reflective and emissive color stimuli viewed through four Commercial Off-the-Shelf (COTS) LEP filters and a neutral density control filter under medium and dark grey background conditions representative of different operational nighttime cockpit conditions. The COTS LEP included two blue blockers, a green blocker, and a red blocker. Inaccuracies in the software implementation were uncovered and addressed in a second experiment; the results of which indicate that overall, the CIECAM02 model provided good predictions for color appearance through LEP. Model predictions were best for the red and green blockers and worst for the extreme blue blocker with performance related to how much and where the LEP transmitted visible light. The results of this effort provide a baseline against which future adjustments to the CAM02 input parameters can be evaluated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2018
- Accession Number
- AD1070457
Entities
People
- Barry P. Goettl
- Brenda J. Novar
- James R. Dykes
- Leon N. McLin
- Paul V. Garcia
- Peter A. Smith
- Rachel J. Singleton
- Thomas K. Kuyk
Organizations
- Air Force Research Laboratory