a full reference image quality assessment model % VCGS Index with automatic downsampling, Version 1.0，2020.1.6 % Copyright(c) 2019 Chenyang Shi，Yandan Lin % All Rights Reserved.
% Please refer to the following paper: % C. Shi and Y. Lin, "Full Reference Image Quality Assessment Based on Visual Salience With Color Appearance and Gradient Similarity," in IEEE Access, vol. 8, pp. 97310-97320, 2020, doi: 10.1109/ACCESS.2020.2995420.