  Understanding semantic intricacies and high-level concepts is essential in
image sketch generation, and this challenge becomes even more formidable when
applied to the domain of videos. To address this, we propose a novel
optimization-based framework for sketching videos represented by the frame-wise
B\'ezier curve. In detail, we first propose a cross-frame stroke initialization
approach to warm up the location and the width of each curve. Then, we optimize
the locations of these curves by utilizing a semantic loss based on CLIP
features and a newly designed consistency loss using the self-decomposed 2D
atlas network. Built upon these design elements, the resulting sketch video
showcases impressive visual abstraction and temporal coherence. Furthermore, by
transforming a video into SVG lines through the sketching process, our method
unlocks applications in sketch-based video editing and video doodling, enabled
through video composition, as exemplified in the teaser.
