Bitmap or Vector? A study on sketch representations for deep stroke segmentation
Résumé
Deep learning achieves impressive performances on image segmentation, which has motivated the recent development
of deep neural networks for the related task of sketch segmentation, where the goal is to assign labels to the
different strokes that compose a line drawing. However, while natural images are well represented as bitmaps, line
drawings can also be represented as vector graphics, such as point sequences and point clouds. In addition to offering
different trade-offs on resolution and storage, vector representations often come with additional information,
such as stroke ordering and speed. In this paper, we evaluate three crucial design choices for sketch segmentation
using deep-learning : which sketch representation to use, which information to encode in this representation,
and which loss function to optimize. Our findings suggest that point clouds represent a competitive alternative to
bitmaps for sketch segmentation, and that providing extra-geometric information improves performance.
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