Performance evaluation of objective quality metrics on HLG-based HDR image coding

TitlePerformance evaluation of objective quality metrics on HLG-based HDR image coding
Publication TypeConference Paper
Year of Publication2018
AuthorsSugito Y, Bertalmío M
Conference NameGlobal Conference on Signal and Information Processing (GlobalSIP)
Abstract

We evaluate the performance of objective quality metrics for high dynamic range (HDR) image coding that uses the transfer function (TF) of the Hybrid Log-Gamma (HLG) method. Previous evaluations of objective metrics for HDR image coding have studied which of them are reliable predictors of perceived quality; however, in those tests, all the non-linear transforms used both for encoding and by the best-performing metrics are essentially very similar and based on visual perception data of detection thresholds for lightness variations. The HLG non-linearity on the other hand is very different, as it is designed for backward compatibility with standard dynamic range (SDR) displays. We test a variety of options for objective metrics, including HLG-based. Our results show that the ranking of metrics for HDR coding changes drastically depending on the TF used for compression.