Here's a very recent article from Googe Brain that uses diffusion models for super-resolution.
The results are shocking! Their model beats the GAN-based SOTA method. The video shows an example of how a 64x64 picture is upscaled to 1024x1024. But no source code yet.
🌀 Project page
📝 Paper
I also wrote about OpenAI paper on diffusion models earlier.
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