Study on User Preference Towards HDR Format Decoding Strategies in Smartphones.

HDR videos can be encoded in a variety of formats with dynamic metadata, the most popular of which are Dolby Vision, HDR Vivid and HDR10+. In this paper, the decoding strategies of these three encoding options are subjectively analyzed in order of their preference in smartphones by performing a psychophysical experiment in a laboratory environment. Three different smartphones were used to display the videos encoded in the three formats respectively. Ten different video sequences were used which ranged from having outdoor, indoor, studio, night-time and skin tones content. The preference experiment was also done for all these videos under four illumination conditions: dark, ITU standard (lowlight), indoor and outdoor (overcast day). Thirty-one observers having different levels of experience in psychophysical experimentation participated in the study.