The effect of noise, a constant background, and bit depth on the phase retrieval of pure phase objects

• Autorzy: Karitans Varis , Tokmakovs Andrejs , Antonuka Adele

Identyfikatory

DOI

10.37190/oa210209

• Języki publikacji: EN

Abstrakty

EN

In the current study, we investigate the effect of uniform white noise, Poisson noise and a constant background on the phase retrieval of pure phase objects. We also study the influence of the aforementioned factors on phase retrieval at different bit depths of intensity measurements. An algorithm called PhaseLift is used for phase retrieval as it requires a small number of modulating masks and can retrieve the phase of an object from sparse intensity measurements of low bit depth. A test object is modulated by eight random masks generated from a single mask and the phase of the object is retrieved from coded diffraction patterns. Different levels of uniform white noise, Poisson noise and constant background are superimposed on the diffraction patterns and the root-mean-square error (RMSE) of the retrieved object is calculated at each level. The results suggest that Poisson noise and a constant background at the same level cause similar RMSE compared to uniform white noise. Lowering the bit depth from 18-bits to 14-bits resulted in the decrease of the RMSE caused by Poisson noise and a constant background. We conclude that the effects of noise and constant background can be reduced by lowering the bit depth.

Słowa kluczowe

EN

phase retrieval; phase problem; diffraction

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2021
• Tom: Vol. 51, nr 2
• Strony: 257--269
• Opis fizyczny: Bibliogr. 23 poz., rys.

Twórcy

autor

Karitans Varis

• Institute of Solid State Physics, University of Latvia, Kengaraga street 8, Riga, Latvia, LV-1063
• Department of Optometry and Vision Science, Faculty of Physics and Mathematics, and Optometry, University of Latvia, Jelgavas street 1, Riga, Latvia, LV-1004

autor

Tokmakovs Andrejs

• Institute of Solid State Physics, University of Latvia, Kengaraga street 8, Riga, Latvia, LV-1063

autor

Antonuka Adele

• Department of Optometry and Vision Science, Faculty of Physics and Mathematics, and Optometry, University of Latvia, Jelgavas street 1, Riga, Latvia, LV-1004

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).