High dynamic range imaging method for interferometry

OPTICS COMMUNICATIONS

卷:284

Article

Vargas, J.¹  Restrepo, R.¹  Antonio Quiroga, J.²  Belenguer, T.¹ 

[1] Inst Nacl Tecn Aeroesp, Lab Instrumentac Espacial, Torrejon De Ardoz 28850, Madrid, Spain

[2] Univ Complutense Madrid, Opt Dept, Fac CC Fis, E-28040 Madrid, Spain

关键词: High dynamic range imaging;    Interferometry;    Fringe analysis;   

DOI  :  10.1016/j.optcom.2011.04.059

来源: Elsevier

【 摘 要 】

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. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

Free