Measuring color differences in gonioapparent materials used in the automotive industry. (April 2015)

• Record Type: Journal Article
• Authors: Melgosa, M; Gómez-Robledo, L; Cui, G; Li, C; Perales, E; Martínez-Verdú, F M; Dauser, T
• Is Part Of: Journal of physics. Number 605(2015)
• Publication Date: 2015-04
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/605/1/012006
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: This paper illustrates how to design a visual experiment to measure color differences in gonioapparent materials and how to assess the merits of different advanced color-difference formulas trying to predict the results of such experiment. Successful color-difference formulas are necessary for industrial quality control and artificial color-vision applications. A color- difference formula must be accurate under a wide variety of experimental conditions including the use of challenging materials like, for example, gonioapparent samples. Improving the experimental design in a previous paper [Melgosaet al., Optics Express 22, 3458-3467 (2014)], we have tested 11 advanced color-difference formulas from visual assessments performed by a panel of 11 observers with normal colorvision using a set of 56 nearly achromatic colorpairs of automotive gonioapparent samples. Best predictions of our experimental results were found for the AUDI2000 color-difference formula, followed by color-difference formulas based on the color appearance model CIECAM02. Parameters in the original weighting function for lightness in the AUDI2000 formula were optimized obtaining small improvements. However, a power function from results provided by the AUDI2000 formula considerably improved results, producing values close to the inter-observer variability in our visual experiment. Additional research is required to obtain a modified AUDI2000 color-difference formula significantly better than the current one.