Author

Feng Li

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#computer vision Preprint Sep 2026

MarKey: Marginal Utility Guided Greedy Keyframe Selection for Long Video Understanding

MarKey is a training-free framework that formulates keyframe selection as subset-aware greedy optimization and consistently outperforms existing methods on six benchmarks spanning holistic video understanding, human-centric video understanding, and open-ended video understanding.

Hongchang Shi, Jin-Peng Hu, Ao Wang et al. · 1 citation

Preprint Aug 2026

On-Policy Self-Distillation in Diffusion Models

The results support on-policy self-distillation as an efficient and analyzable approach to diffusion post-training by converting image-level reward guidance into explicit and continually refreshed intermediate supervision, thereby opening a path toward more efficient and diagnosable alignment.

Weina Zhou, Xiongwei Zhu, Ling-Dong Kong et al. · 6 citations