Human Perceptual Loss

[Luke2642]

A fantastic repository, thank you.

I'm just getting started with it, but I just thought I'd reach out and ask if you'd accept a pull request that trains for human percetual quality rather than MAE / PSNR in future?

I'm thinking a simple way to achieve a partial solution is to retrain on images in a colourspace like OKLAB where perceptual difference is baked in, and the perceived colour difference formula is trivial, instead of monstrous!

I was also thinking 'edge loss' or extra channels for the H&V image gradients during training with L1 loss, discarded after, could be good.

A rolls royce solution might be adversarial loss, perhaps using a secondary network like Netflix vmaf or something?

If there are any resources related to perceptual quality rather than PSNR, please do point me in the right direction :-)

[NikolasMarkou]

Hi Luke of course, I will take a look at it. As far as the others go, i have a custom unet/convnext architecture i havent pushed due to lack of time.

1. OKLAB, havent even considered it, lets make it optional in the training
2. edge loss, just put more emphasis on the weight of the loss, make it optional in the training
3. adversarial loss, kinda of an overkill, what do you suggest
4. the only perceptual metric i know and use is the SSIM, dont recall if i added in the repo. I like your ideas and i will take a look at them over the weeked if you make the request. Regards

Στις Πέμ 21 Μαρ 2024 στις 12:18 μ.μ., ο/η Luke Perkin < @.***> έγραψε:

A fantastic repository, thank you.

I'm just getting started with it, but I just thought I'd reach out and ask if you'd accept a pull request that trains for human percetual quality rather than MAE / PSNR in future?

I'm thinking a simple way to achieve a partial solution is to retrain on images in a colourspace like OKLAB where perceptual difference is baked in, and the perceived colour difference formula is trivial, instead of monstrous!

I was also thinking 'edge loss' or extra channels for the H&V image gradients during training with L1 loss, discarded after, could be good.

A rolls royce solution might be adversarial loss, perhaps using a secondary network like Netflix vmaf or something?

If there are any resources related to perceptual quality rather than PSNR, please do point me in the right direction :-)

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-- Markou Nikolas (MSc, MEng, BEng)

Computer Engineer, Machine Learning / Artificial Intelligence Engineer

[Luke2642]

Thanks! I'm glad 1 & 2 seem sensible and interesting to you!

Your four targets are really well chosen, really focused on light weight and fast. I've just realised now, today, that 3 & 4 are actually a new target: to train a blind restoration diffusion model that focuses on boosting the perceptual quality of noisy natural images, not just reducing statistical noise.

Searching for those keywords, "blind restoration diffusion model", I just found:

DiffBIR: Towards Blind Image Restoration with Generative Diffusion Prior https://github.com/XPixelGroup/DiffBIR

But it is very heavy, even the lightest is 90mb ish, and uses a transformer, so heavier on compute. It will be exciting to see how close we can get with less than 5mb of parameters in a bias free CNN. Diffusion models are so incredibly amazing though, I was blown away by the Zahra/Florentin/Eero/Stéphane recent work, which follows on from BF-CNN:

https://arxiv.org/abs/2310.02557 https://www.youtube.com/watch?v=V_t6QppPbwQ