We discuss one more possibility to remove noise from background of the image as well as possibility of the image decomposition and its reconstruction.
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Vyacheslav A. Trofimov, Vladislav V. Trofimov, Ivan L. Shestakov, Roman G. Blednov, Valentine Yu. Kovalev, "Effective algorithm based on Fourier transform for the passive THz image quality enhancement," Proc. SPIE 10209, Image Sensing Technologies: Materials, Devices, Systems, and Applications IV, 1020907 (18 May 2017);