Polygon-free: Unconstrained Scene Text Detection with Box Annotations. (arXiv:2011.13307v3 [cs.CV] UPDATED)

Although a polygon is a more accurate representation than an upright bounding
box for text detection, the annotations of polygons are extremely expensive and
challenging. Unlike existing works that employ fully-supervised training with
polygon annotations, this study proposes an unconstrained text detection system
termed Polygon-free (PF), in which most existing polygon-based text detectors
(e.g., PSENet [33],DB [16]) are trained with only upright bounding box
annotations. Our core idea is to transfer knowledge from synthetic data to real
data to enhance …

annotations arxiv cv detection free polygon text