Imaging tristimulus colorimeter for the evaluation of color in printed textiles

Martin A. Hunt; James S. Goddard Jr.; Kathy W. Hylton; Thomas P. Karnowski; Roger K. Richards; Marc L. Simpson; Kenneth W. Tobin Jr.; Dale A. Treece

doi:10.1117/12.341131

8 March 1999 Imaging tristimulus colorimeter for the evaluation of color in printed textiles

Martin A. Hunt, James S. Goddard Jr., Kathy W. Hylton, Thomas P. Karnowski, Roger K. Richards, Marc L. Simpson, Kenneth W. Tobin Jr., Dale A. Treece

Author Affiliations +

Proceedings Volume 3652, Machine Vision Applications in Industrial Inspection VII; (1999) https://doi.org/10.1117/12.341131
Event: Electronic Imaging '99, 1999, San Jose, CA, United States

Abstract

The high-speed production of textiles with complicated printed patterns presents a difficult problem for a colorimetric measurement system. Accurate assessment of product quality requires a repeatable measurement using a standard color space, such as CIELAB, and the use of a perceptually based color difference formula, e.g. (Delta) E_CMC color difference formula. Image based color sensors used for on-line measurement are not colorimetric by nature and require a non-linear transformation of the component colors based on the spectral properties of the incident illumination, imaging sensor, and the actual textile color. This research and development effort describes a benchtop, proof-of-principle system that implements a projection onto convex sets (POCS) algorithm for mapping component color measurements to standard tristimulus values and incorporates structural and color based segmentation for improved precision and accuracy. The POCS algorithm consists of determining the closed convex sets that describe the constraints on the reconstruction of the true tristimulus values based on the measured imperfect values. We show that using a simulated D65 standard illuminant, commercial filters and a CCD camera, accurate (under perceptibility limits) per-region based (Delta) E_CMC values can be measured on real textile samples.

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Martin A. Hunt, James S. Goddard Jr., Kathy W. Hylton, Thomas P. Karnowski, Roger K. Richards, Marc L. Simpson, Kenneth W. Tobin Jr., and Dale A. Treece "Imaging tristimulus colorimeter for the evaluation of color in printed textiles", Proc. SPIE 3652, Machine Vision Applications in Industrial Inspection VII, (8 March 1999); https://doi.org/10.1117/12.341131

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