Performance comparisons of S-curve and LUT charaterization models for LCDS

Abstract

This research aimed to evaluate performance of two characterization methods: 3D LUT and S-curve model, for LCD characterization. In the experiment, the colorimetric values were measured with a spectroradiometer in a dark room. Before characterization, the characteristics of LCD monitor were tested, which were spectral characteristics, channel independence, chromaticity constancy, spatial independence, spatial uniformity, temporal stability. It was found that this LCD had good performance for all properties. In the characterization process, two training sets were used: one had 729 sample data for creating 3D LUT and the other had a 36-step neutral ramp for creating the S-curve model. The performance of the characterization models was tested using a test set, which contained 200 random colors. The average color difference ( [delta]E*ab) between measured colors and predicted colors from 3D LUT was 1.8. The average color difference ( [delta]E*ab) between measured colors and predicted colors from S-curve was 1.3. Thus the S-curve model could predict colorimetric values more accurate than 3D LUT.