17 July 2006 Impact of the 2D structured noise in the post-processing of hybrid optical-digital imaging systems
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Proceedings Volume 6342, International Optical Design Conference 2006; 63421H (2006) https://doi.org/10.1117/12.692293
Event: International Optical Design Conference 2006, 2006, Vancouver, BC, Canada
Abstract
The effect of the 2D structured noise on the post-processing of images in hybrid optical-digital imaging systems is studied on the basis of the Wiener restoration filter. 2D structured noise is modeled as an additive noise that has the same random value along a row or a column in the image. The restoration is carried out with the Wiener filter in an unsupervised way by the use of well established procedures to determine the filter constant as a function of the noise power. We show that the classical Wiener filter is not satisfactory for the case of systems affected by 2D noise and we conclude that this is caused by an overdetermantion of the 2D noise in the procedure to find the filter constant. From this conclusion we propose a new filter based on the separability of the Optical Transfer Function of the optical system that depends on two constants, one for each principal direction of the 2D noise. Furthermore, we define a procedure for the unsupervised determination of these constants and we evaluate the quality of the restoration obtained by this procedure.
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Salvador Bosch, Salvador Bosch, Raul Tudela, Raul Tudela, Marta C. de la Fuente, Marta C. de la Fuente, Josep Ferré-Borrull, Josep Ferré-Borrull, } "Impact of the 2D structured noise in the post-processing of hybrid optical-digital imaging systems", Proc. SPIE 6342, International Optical Design Conference 2006, 63421H (17 July 2006); doi: 10.1117/12.692293; https://doi.org/10.1117/12.692293
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