Signboard Information Extraction and Reconstruction from a Grey Scene Image

摘要

In this paper, we describe a method for finding signboard information in a grey scene image and reconstructing distorted signboard images taken from a non-orthogonal viewing direction. First, signboards in scene images are detected by using several heuristics of characters and character lines. Then, we try to compute the relative orientation of the camera and a detected signboard from a single view. Finally, we reconstruct distorted signboard images, and this makes the recognition of characters under a wider range of viewing condition much easier. The proposed approach can be very helpful for the development of a robot navigation and environment map generation system.