JPEG Artifact Correction using Denoising Diffusion Restoration Models
This addresses image quality degradation from JPEG compression for users needing artifact correction, though it is incremental as it builds on existing DDRM methods.
The paper tackled the problem of JPEG artifact correction by extending Denoising Diffusion Restoration Models (DDRM) to handle non-linear inverse problems, achieving performance on par with state-of-the-art methods specifically trained for JPEG restoration.
Diffusion models can be used as learned priors for solving various inverse problems. However, most existing approaches are restricted to linear inverse problems, limiting their applicability to more general cases. In this paper, we build upon Denoising Diffusion Restoration Models (DDRM) and propose a method for solving some non-linear inverse problems. We leverage the pseudo-inverse operator used in DDRM and generalize this concept for other measurement operators, which allows us to use pre-trained unconditional diffusion models for applications such as JPEG artifact correction. We empirically demonstrate the effectiveness of our approach across various quality factors, attaining performance levels that are on par with state-of-the-art methods trained specifically for the JPEG restoration task.