Title: Condensing Videos by Learning Where Motion Matters
Primary area: unsupervised, self-supervised, semi-supervised, and supervised representation learning
Keywords: Video Dataset Condensation

Abstract: Video dataset condensation aims to mitigate the immense computational cost of video processing, but faces the unique challenge of preserving the complex interplay between spatial content and temporal dynamics. Prior work often unnaturally disentangles these elements, overlooking their essential interdependence. We introduce Dynamic Frame Synthesis (DFS), a novel approach that preserves this critical coupling. DFS begins with a minimal set of key frames and dynamically synthesizes new ones by identifying moments of high motion complexity, where simple interpolation fails, through gradient misalignments. This adaptive process allocates new frames only where such complexity exists, creating highly efficient and temporally coherent synthetic datasets. Extensive experiments show DFS outperforms prior methods on standard action recognition benchmarks, creating powerful representations with significantly less storage.

TL;DR: Video Dataset Condensation