Color measurements of nonhomogeneous colored flat surfaces using a PC-based color camera vision system

Franz A. Pertl; Robert P. M. Craven; James E. Smith; Curtis Duhn

doi:10.1117/12.285580

18 September 1997 Color measurements of nonhomogeneous colored flat surfaces using a PC-based color camera vision system

Franz A. Pertl, Robert P. M. Craven, James E. Smith, Curtis Duhn

Author Affiliations +

Proceedings Volume 3205, Machine Vision Applications, Architectures, and Systems Integration VI; (1997) https://doi.org/10.1117/12.285580
Event: Intelligent Systems and Advanced Manufacturing, 1997, Pittsburgh, PA, United States

Abstract

This paper presents a test of a vision system's capability to measure consistently the color of blotches and other distinctly colored regions on a flat surface. The system consists of an off-the-shelf color camera, a color-corrected halogen illumination source, and a personal computer equipped with a frame grabber. Correction algorithms to compensate for spatial variations in illumination and sensitivity differences between pixels and the RGB channels are employed along with a calibration procedure to assure consistent measurements of the differently colored regions over a number of samples. A custom conversion of RGB to XYZ color space based on a linear-least squares fit within a certain portion of the color space was also explored to determine its suitability.

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Franz A. Pertl, Robert P. M. Craven, James E. Smith, and Curtis Duhn "Color measurements of nonhomogeneous colored flat surfaces using a PC-based color camera vision system", Proc. SPIE 3205, Machine Vision Applications, Architectures, and Systems Integration VI, (18 September 1997); https://doi.org/10.1117/12.285580

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