A performance evaluation protocol for symbol spotting systems in terms of recognition and location indices

Authors:
Marçal Rusiñol;Josep Lladós
Affiliations:
Universitat Autònoma de Barcelona, Dept. Ciències de la Computació, Computer Vision Center Edifici O, 08193, Bellaterra (Barcelona), Spain;Universitat Autònoma de Barcelona, Dept. Ciències de la Computació, Computer Vision Center Edifici O, 08193, Bellaterra (Barcelona), Spain
Venue:
International Journal on Document Analysis and Recognition
Year:
2009

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Abstract

Symbol spotting systems are intended to retrieve regions of interest from a document image database where the queried symbol is likely to be found. They shall have the ability to recognize and locate graphical symbols in a single step. In this paper, we present a set of measures to evaluate the performance of a symbol spotting system in terms of recognition abilities, location accuracy and scalability. We show that the proposed measures allow to determine the weaknesses and strengths of different methods. In particular we have tested a symbol spotting method based on a set of four different off-the-shelf shape descriptors.