De Simone, FrancescaGoldmann, LutzFilimonov, DenisEbrahimi, Touradj2009-11-202009-11-202009-11-202010https://infoscience.epfl.ch/handle/20.500.14299/44371The study presented in this paper aims at quantifying the empirical limits of JPEG optimization, when the compressed stream is standard compliant and only the quantization tables are optimized. Image-dependent quantization tables, which minimize the bitrate of the compressed image while maintaining transparent visual quality, are identified by means of a psychovisual experiment. The results demonstrate that significant room for improving JPEG compression efficiency is available.text::conference output::conference proceedings::conference paper