A coding theorem for the rate-distortion-perception functionDownload PDF

Mar 04, 2021 (edited Apr 01, 2021)Neural Compression Workshop @ ICLR 2021Readers: Everyone
  • Keywords: compression, perception-distortion trade-off, coding theorem, achievability
  • TL;DR: We prove achievability (and its converse) of the rate-distortion-perception function with stochastic codecs
  • Abstract: The rate-distortion-perception function (RDPF; Blau and Michaeli, 2019) has emerged as a useful tool for thinking about realism and distortion of reconstructions in lossy compression. Unlike the rate-distortion function, however, it is unknown whether encoders and decoders exist that achieve the rate suggested by the RDPF. Building on results by Li and El Gamal (2018), we show that the RDPF can indeed be achieved using stochastic, variable-length codes. For this class of codes, we also prove that the RDPF lower-bounds the achievable rate.
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