Color correction with 3D lookup tables in diffractive optical imaging systems

摘要

Diffractive optical elements (DOE) have significant advantage over refractive optics in linear dimensions and weight. However, the quality of images produced by a diffractive optics-based system suffers from strong distortions. In previous papers, we introduced and enhanced post-capture computational image reconstruction for diffractive Fresnel lens. In this paper, we revise chromatic shift correction method. Energy redistribution between diffractive orders results in chromatic shift and affects image quality. Each of the RGB channels has nonlinear flare spots from two other channels. In this paper, we present multicomponent color correction using three-dimensional lookup tables that takes into account the nonlinear relationship between color channels. PSNR values are used to compare the quality of the presented multicomponent approach with a previously described single-channel method.