Optimized implementation of waifu2x (https://github.com/nagadomi/waifu2x)
- Original implementation: https://github.com/nagadomi/waifu2x
- Python implementation: https://marcan.st/transf/waifu2x.py
- Model data for scale2x: https://marcan.st/transf/scale2.0x_model.json
- picojson: https://github.com/kazuho/picojson