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cs.CV2026
MG-SpaIR: Multi-grade Sparse-guided Implicit Representation for Training-Data-Free Image Restoration
Jianmin Liao, Lei Huang, Ronglong Fang +3
MG-SpaIR is a training-data-free framework for restoring a clean image from a single observation corrupted by a mixture of blur, downsampling, noise, and missing pixels. Building o…
math.OC2026
Exact Series and Error-Controlled Evaluation of the Nonconvex Proximity Operator
Lixin Shen, Jiangyu Yu
We study the scalar proximity operator of the nonconvex power penalty with exponent between zero and one. Lagrange--Bürmann inversion gives an exact series for the larger stationar…