AI Denoising (1 person, easy):

integrate the Intel Open Image Denoise

modify the renderer to output what is needed for the denoiser

write a new app yimagedenoise that takes the new images in and output the denoised ones

favor HDR image processing but support both HDR and LDR

compare this to your own implementation of an non-local-means denoiser; you can grab the code from anywhere you want