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Improvement and optimization of cotton colorimeter based on Hunter color coordinate conversion

Based on the CIE XYZ standard chromaticity system of cotton colorimeter, because of the differences in light source, color sensor and circuit system, the measured cotton chromaticity grading index (reflectance Rd and yellowness +b) is inevitably different compared with the international standard measurement value, and the difference often exceeds the standard requirement. In this paper, we propose a calibration method using multiple standard color plates combined with polynomial fitting method. First, we use cotton chromaticity meter to measure a set of standard color plates that have been assigned values, and get the cotton chromaticity grading indexes (reflectance Rd and yellowness +b) according to the chromaticity system conversion formula, and then use polynomial fitting method to correct the measured values for nonlinearity. With such the correction method, the relative errors of both the corrected reflectance and yellowness are much less than 2%, which is a significant improvement to the accuracy of the detection as well as the discrete type..