tailieunhanh - Báo cáo hóa học: " Fast Adaptive Nonuniformity Correction for Infrared Focal-Plane Array Detectors"

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: Fast Adaptive Nonuniformity Correction for Infrared Focal-Plane Array Detectors | EURASIP Journal on Applied Signal Processing 2005 13 1994-2004 2005 Hindawi Publishing Corporation Fast Adaptive Nonuniformity Correction for Infrared Focal-Plane Array Detectors Esteban Vera Department of Electrical Engineering University of Concepcion Casilla 160-C Correo 3 Concepcion Chile Email evera@ Sergio Torres Department of Electrical Engineering University of Concepcion Casilla 160-C Correo 3 Concepcion Chile Email storres@ Received 29 October 2003 Revised 15 January 2005 A novel adaptive scene-based nonuniformity correction technique is presented. The technique simultaneously estimates detector parameters and performs the nonuniformity correction based on the retina-like neural network approach. The proposed method includes the use of an adaptive learning rate rule in the gain and offset parameter estimation process. This learning rate rule together with a reduction in the averaging window size used for the parameter estimation may provide an efficient implementation that should increase the original method s scene-based ability to estimate the fixed-pattern noise. The performance of the proposed algorithm is then evaluated with infrared image sequences with simulated and real fixed-pattern noise. The results show a significative faster and more reliable fixed-pattern noise reduction tracking the parameters drift and presenting a good adaptability to scene changes and nonuniformity conditions. Keywords and phrases infrared detectors focal-plane array nonuniformity correction fixed-pattern noise neural networks least mean square. 1. INTRODUCTION Infrared detectors are widely used in a variety of applications such as defense surveillance remote sensing and astronomy. Usually the infrared imaging sensors are based on the infrared focal-plane array IRFPA technology 1 2 3 . An IRFPA can be considered as an array of independent detectors aligned at the focal plane of the imaging system. Unfortunately every detector on the IRFPA can have .