In this work, linear and exponential weighted principal component analysis techniques based on spectral similarity were employed for the prediction of dye concentration in coloured fabrics, which had been dyed with three component dye mixtures. The matching strategy was based on the equalisation of the first three principal component coordinates of the weighted reflectance curves of the predicted and target sample in a dynamic 3D eigenvector space. The performance of the proposed algorithm was evaluated by the root mean square differences of the reflectance curves and the relative error of the concentration prediction, as well as the metamerism index. The obtained results indicated that the developed exponential weighted principal component analysis method is more accurate than the spectrophotometric method and the simple principal component analysis matching strategy.
In this investigation, the behavior of crossover points of spectral reflectance of metameric pairs in the frequency domain has been studied. Also the general metameric index has been calculated using a power spectrum by Fourier transformation. Correlation between these results and the results of current methods was studied. Results show that the transformation of spectral reflectance differences of metameric pairs in the frequency domain could be considerable. This new approach is regarded as a useful method to investigate the metamerism phenomenon.
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