High dynamic range imaging method for interferometry |
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Authors: | J Vargas R Restrepo T Belenguer |
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Institution: | a Laboratorio de Instrumentación Espacial, Instituto Nacional de Técnica Aeroespacial, Carretera de Ajalvir Km 4, 28850, Torrejón de Ardoz (Madrid), Spainb Optics Department, Universidad Complutense de Madrid, Facultad de CC. Físicas, Ciudad Universitaria s/n, 28040 Madrid, Spain |
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Abstract: | We demonstrate a method to easily and quickly extend the dynamic range imaging capabilities of the camera in a typical interferometric approach. The camera dynamic range is usually low and limited to 256 gray levels. Also, it is well known that one may have over or under-exposed regions in the interferogram (due to non-uniform illumination) which makes these image regions not reliable. In our proposed method it is not necessary to obtain or use the non-linear camera response curve in order to extend the camera dynamic range. We obtain a sequence of differently exposed interferograms, typically five or six; after that, we compute the corresponding normalized fringe patterns and modulation maps using a typical normalization method. These normalized patterns are combined through a temporal weighted average using as weights the corresponding modulation maps. We show a set of experimental results that prove the effectiveness of the proposed method. |
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Keywords: | High dynamic range imaging Interferometry Fringe analysis |
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