What’s new in Cool-chic 4.2?

Cool-chic 4.2 focuses on perceptually-oriented image coding. This release draws heavily on the following paper: Good, Cheap, and Fast: Overfitted Image Compression with Wasserstein Distortion, Ballé et al.

• Wasserstein Distance as a distortion metric: --tune=wasserstein

• Decoder-side common randomness for more high-frequency in the decoded image

• Improved image coding performance: around -50% rate versus Cool-chic 4.1 for the same visual quality

• Low decoding complexity 1728 MAC / pixel

A pair of bitstreams in samples/bitstreams/ illustrates the benefits of the --tune=wasserstein options. See the decoding example to decode them and see the pictures.

Check-out the release history to see previous versions of Cool-chic.