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v4.0.0
🎥 Cool-chic 4.0.0: Video is back! 🎥
This release brings back video compression with Cool-chic. Based on the latest Cool-chic video paper. The main improvements are:
- Cool-chic now compresses inter frames with two cool-chic modules: one for the motion and one for the residue
- The motion module training is guided through a RAFT optical flow estimator for more accurate motion.
This release does not affect image compression performance which remains identical to v3.4.1
Image compression performance
| BD-rate of Cool-chic 4.0 vs. [%] | Avg. decoder complexity | ||||||
|---|---|---|---|---|---|---|---|
| Cheng | ELIC | C3 | HEVC (HM 16) | VVC (VTM 19) | MAC / pixel | CPU Time [ms] | |
| kodak | -4.2 % | +7.5 % | -4.3 % | -17.2 % | +3.4 % | 1303 | 74 |
| clic20-pro-valid | -13.2 % | -0.2 % | -1.3 % | -25.1 % | -2.3 % |
1357 | 354 |
| jvet (BCDEF) | / | / | / | -18.3 % | +18.6 % | 1249 | 143 |
| jvet (class B) | / | / | / | -9.9 % | +20.7 % | 1300 | 282 |
| jvet (class C) | / | / | / | -16.1 % | +9.2 % | 1289 | 69 |
| jvet (class D) | / | / | / | -12.4 % | +9.6 % | 948 | 18 |
| jvet (class E) | / | / | / | -6.2 % | +27.8 % | 1347 | 125 |
| jvet (class F) | / | / | / | -31.8 % | +20.6 % | 1249 | 182 |
Video compression performance (Random Acess, intra period 32)
| Sequence | BD-rate of Cool-chic 4.0.0 against [%] | Decoding complexity | |||
|---|---|---|---|---|---|
| HEVC (HM 16) | HEVC (x265-medium) | AVC (x264-medium) | MAC / pixel | Frame rate [fps] | |
| C-BasketballDrill | +59.6 | +15.2 | -11.5 | 946 | 18.3 |
| C-BQMall | +128.7 | +49.3 | +20.6 | 945 | 16.7 |
| C-PartyScene | +113.0 | +37.9 | +20.3 | 946 | 17.5 |
| C-RaceHorses | +118.7 | +41.0 | +19.3 | 950 | 16.5 |
| Average | +105.0 | +35.9 | +12.2 | 947 | 17.3 |