A new criterion for quantitative appraisal of de-noising algorithms in digital Fresnel holography
Résumé
This paper presents a reference-free metric for quantitative appraisal of de-noising algorithms for digital Fresnel holography. In literature, lots of reported metrics are based on the availability of the noise-free reference phase to obtain ranking of selected de-noising algorithms. When such information is no longer available, other metrics must be chosen. The problem is that obtained rankings could be quite different than those using noise-free phase maps. This is the case for example with the signal-to-distortion ratio criterion. In order to avoid such problem, we propose a new criterion based on the use of a robust estimator of the speckle noise phase map using the 2D windowed Fourier transform. On one hand, correlation diagram between PSNR (using a noise-free reference) and our new metric (without any noise-free reference), and on the other hand, comparison of the rankings computed on selected de-noising algorithms demonstrate the validity of the proposed reference-free approach.