arXiv Computer Vision By Zhuohan Ouyang, Zhe Qian, Wenhuo Cui, Chaoqun Wang

Region-Constrained Group Relative Policy Optimization for Flow-Based Image Editing

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The paper introduces RC‑GRPO‑Editing, a region‑constrained Group Relative Policy Optimization framework for flow‑based image editing. It localizes exploration by decoupling initial noise perturbations to reduce background‑induced reward variance and adds an attention concentration reward to keep cross‑attention focused on the intended editing region. Experiments on CompBench demonstrate consistent gains in instruction adherence within the editing region while better preserving non‑target content.

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