Implementation of Digital Still Camera ICC Profile Generator

摘要

The paper describes an implementation of Digital Still Camera (DSC) ICC profile generator. Both the three components matrix model and N components look-up-table model are implemented in the DSC ICC profile generator. The generator mainly consists of a reference-file-parser, a lightness-equalizer, a target-image-analyzer, and a profile-parameter-evaluator. The reference-file-parser retrieves the XYZ and Lab values of color patches from the ANSI CGATS.5 compliance file that records the measured values of IT8.7/2 target. The lightness-equalizer is used to remove the shading effect of lens and non-uniformity of light source from captured IT8.7/2 target image. Then, the RGB values of color patches of IT8.7/2 target image are extracted automatically by the target-image-analyzer. Once the RGB, XYZ, and Lab values of color patches obtained, the parameters required for constructing the DSC ICC profile can be evaluated by profile-parameter-evaluator. Experimental results show, based on the test of 2 types of DSCs, the average ΔE~*abs less than 4 are achieved by using the three-dimensional look-up-table based model with the size of 9 x 9 x 9.