SP³ Uses Spherical Encoders as Plug-and-Play Image Restoration Priors
June 14, 2026
SP³ replaces denoisers in Plug-and-Play MAP restoration with Spherical Encoders, using Half-Quadratic Splitting to alternate between a structured latent-space projection and a closed-form data-consistency step. The method converges without gradient computation at inference and produces usable outputs from the first iteration across multiple restoration tasks.
HOW THIS AFFECTS YOU
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researcherAnytime inference and gradient-free convergence are practically useful properties; benchmark comparisons against diffusion-prior PnP methods would clarify where this fits in the tradeoff space.