Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Hardware Architecture for Pattern Recognition in Gamma-Ray Experiment | Hindawi Publishing Corporation EURASIP Journal on Embedded Systems Volume 2009 Article ID 737689 15 pages doi 2009 737689 Research Article Hardware Architecture for Pattern Recognition in Gamma-Ray Experiment Sonia Khatchadourian 1 Jean-Christophe Prevotet 2 and Lounis Kessal1 1ETIS CNRS UMR 8051 ENSEA University of Cergy-Pontoise 6 Avenue du Ponceau 95014 Cergy-Pontoise France 2IETR CNRS UMR 6164 INSA de Rennes 20 Avenue des buttes de Coesmes 35043 Rennes France Correspondence should be addressed to Sonia Khatchadourian Received 19 March 2009 Accepted 21 July 2009 Recommended by Ahmet T. Erdogan The HESS project has been running successfully for seven years. In order to take into account the sensitivity increase of the entire project in its second phase a new trigger scheme is proposed. This trigger is based on a neural system that extracts the interesting features of the incoming images and rejects the background more efficiently than classical solutions. In this article we present the basic principles of the algorithms as well as their hardware implementation in FPGAs Field Programmable Gate Arrays . Copyright 2009 Sonia Khatchadourian et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction For many years the study of gamma photons have led scientists to understand more deeply the complex processes that occur in the Universe for example remnants of supernova explosions cosmic rays interactions with interstellar gas and so forth. In the 1960s it has finally been possible to develop efficient measuring instruments to detect gammaray emissions thus enabling to validate the theoretical concepts. Most of these instruments were built in order to identify the direction of gammas rays. Since gamma photons are not deflected by interstellar magnetic fields it
