Parameterized Blur Kernel Prior Learning for Local Motion Deblurring

Abstract

Unlike global motion blur, Local Motion Deblurring (LMD) presents a more complex challenge, as it requires precise restoration of blurry regions while preserving the sharpness of the background. Existing LMD methods rely on manually annotated blur masks and often overlook the blur kernel's characteristics, which are crucial for accurate restoration. To address these limitations, we propose a novel parameterized motion kernel modeling approach that defines the motion blur kernel with three key parameters: length, angle, and curvature. We then use networks to estimate these kernel parameters, significantly improving the accuracy of blur kernel estimation. To effectively learn the motion blur representation, we incorporate a shared memory bank that stores blur prior information. Additionally, we introduce a dual-branch deblurring network: one branch leverages Mamba to capture long-range dependencies, while the other uses a mask-guided CNN focused on refining the local blurry regions. By fully utilizing the estimated bur prior information, our approach greatly enhances deblurring outcomes. Experimental results show that our method achieves state-of-the-art performance both quantitatively and visually, with a substantial reduction in computational complexity.