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. !5
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