Retrieval of the Ornaments from the Hand-Press Period: An Overview

This paper deals with the topic of the retrieval of document images focused on a specific application: the ornaments of the hand-press period. It presents an overview as a result of the work and the discussions undertaken by a workgroup on this subject. The paper starts by giving a general view about digital libraries of ornaments and associated retrieval problematics. Two main issues are underlined:content based image retrieval (CBIR) and image difference visualization. Several contributions are summarized,commented and compared. Conclusions and open problems arising from this overview are twofold: 1. contributions on CBIR miss scale-invariant methods and don´t provide significative evaluation results. 2. robust registration is the open problem for visual comparison.