Title: GLaVE-Cap: Global-Local Aligned Video Captioning with Vision Expert Integration
Primary area: applications to computer vision, audio, language, and other modalities
Keywords: Video Captioning, Fine-Grained Video Description, Global-Local Alignment, Vision Experts, Video Benchmark, Video QA Dataset, Video-LLM

Abstract: Video detailed captioning aims to generate comprehensive video descriptions to facilitate video understanding. Recently, most efforts in the video detailed captioning community have been made towards a local-to-global paradigm, which first generates local captions from video clips and then summarizes them into a global caption. However, we find this paradigm leads to less detailed and contextual-inconsistent captions, which can be attributed to (1) no mechanism to ensure fine-grained captions, and (2) weak interaction between local and global caption generation.
To remedy the above two issues, we propose **GLaVE-Cap**, a **G**lobal-**L**ocal **a**ligned framework with **V**ision **E**xpert integration for **Cap**tioning, which consists of two core modules: TrackFusion enables comprehensive local caption generation, by leveraging vision experts to acquire cross-frame visual prompts, coupled with a dual-stream structure; while CaptionBridge establishes a local-global interaction, by using global context to guide local captioning, and adaptively summarizing local captions into a coherent global caption. Besides, we construct **GLaVE-Bench**, a comprehensive video captioning benchmark featuring 5$\times$ more queries per video than existing benchmarks, covering diverse visual dimensions to facilitate reliable evaluation.
We further provide a training dataset **GLaVE-1.2M** containing 16K high-quality fine-grained video captions and 1.2M related question-answer pairs. Extensive experiments on four benchmarks show that our GLaVE-Cap achieves state-of-the-art performance. Besides, the ablation studies and student model analyses further validate the effectiveness of the proposed modules and the contribution of GLaVE-1.2M to the video understanding community. The source code, model weights, benchmark, and dataset will be open-sourced.