Decode provided bitstreams · Compression performance

Cool-chic (pronounced /kul ʃik/ as in French 🥖🧀🍷) is a low-complexity neural image codec based on overfitting. It offers image coding performance competitive with H.266/VVC for 2000 multiplications per decoded pixel.

Current & future features

   ⚬    Coding performance
       -   ✅ On par with VVC for image coding
       -   ❌ Upcoming improved Cool-chic video

   ⚬  I/O format
       -  ✅ PPM for 8-bit RGB images, yuv420 8-bit and 10-bit
       -  ❌ yuv444
       -  ❌ Additional output precisions (12, 14 and 16-bit)
       -  ❌ Output PNG instead of PPM for the decoded images

   ⚬  Decoder
       -   ✅ Fast C implementation
       -   ✅ Integer computation ARM
       -   ✅ Complete integerization
       -   ✅ Decrease memory footprint & faster decoding

Cool-chic 3.3 improvements

• Make the CPU-only decoder even faster

  • Decode a 720p image in 100 ms, 2x faster than Cool-chic 3.2

  • Full integerization of the decoder for replicability

  • Reduce decoder memory footprint

  • Optimized implementation of 3x3 convolutions & fusion of successive 1x1 convolutions

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

Attention

🛑 Cool-chic 3.3 temporarily disables video coding. If you really want to compress videos you can

• Go back to 3.1: git clone --branch v3.1 https://github.com/Orange-OpenSource/Cool-Chic.git

• Wait for Cool-chic 4.0 for better and faster video coding 😉.

Thanks

Special thanks go to:

• Hyunjik Kim, Matthias Bauer, Lucas Theis, Jonathan Richard Schwarz and Emilien Dupont for their great work enhancing Cool-chic: C3: High-performance and low-complexity neural compression from a single image or video, Kim et al.