Synthesis of Reflectance Spectra Using Non-Context-Based Features

Document Type : Original Article

Authors

Department of Textile Engineering, Amirkabir University of Technology (Tehran Polytechnic), P.O. Box: 159163-14311, Tehran, Iran.

Abstract

The non-context-based approach is used for the synthesis of spectral reflectance curves of objects with known CIEXYZ tristimulus values. The method introduces two sets of features, i.e., the standard color-matching functions normalised by their sum in each wavelength and a group of two sigmoidal and one Gaussian bases that approximately fit the first set. The assigned spectra for the desired tristimulus colorimetric values are calculated using an additive color-mixing approach. Results of different methodologies are numerically compared in terms of root mean squared error (RMSE), goodness fit coefficient (GFC), and CIELAB color difference values between the actual and synthesised spectra. It is found that the synthesised spectra by the suggested primaries better resemble the actual behaviours of spectral reflectances of natural and synthetic objects in comparison to using three Gaussian primaries. Compared to other context and non-context-based approaches to spectral reconstruction, the suggested method is faster and does not require iterative optimisation. 

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