Vectorial Signatures for Symbol Recognition and Spotting

Abstract

In this chapter, we present a method to determine which symbols are probable to be found in technical drawings by the use of vectorial signatures as symbol descriptors. The proposed signature model is formulated in terms of geometric and structural constraints among segments, such as parallelisms, straight angles, etc. After representing vectorized line drawings with attributed graphs, our approach works with a multi-scale representation of these graphs, retrieving the features that are expressive enough to create the signature.