arXiv Computer Vision By Yilai Liu, Wenqi Pei, Zhifeng Lu, Shiyuan Zhang, Zongxi Liu, Hongyang Du

PreCoG: Preview-Edit for Efficient Video Correction in Generation-Time

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PreCoG is an iterative framework that corrects semantic failures in text‑to‑video generation by using low‑cost previews to diagnose issues (PreQA) and then editing cached generation trajectories (PreEdit) under corrective conditions. This approach limits disruption to already correct content and only completes generation for selected candidates, reusing cached trajectories to reduce redundant computation. Experiments show that PreCoG achieves top scores on VBench and T2V‑CompBench, approaches VSR’s VS2 score at 0.56× inference time, and outperforms GENMAC on all quality and alignment metrics at 0.86× inference time.

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