IEEE Trans Image Process - Artifact removal for GLS map makers by means of post-processing.

Tópicos

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Resumo

The quality of astrophysical images produced by means of the Generalised Least Square (GLS) approach may be degraded by the presence of artificial structures, obviously not present in the sky. This problem affects in different degrees all images produced by the instruments onboard the European Space Agency (ESA) Herschel satellite. In this paper we analyse these artifacts and introduce a method to remove them. The method is based on a post-processing of GLS image that estimates and removes the artifacts subtracting them from the original image. We find that the only drawback of this method is a slight increase of the background noise which, however, can be mitigated by detecting the artifacts and by performing the subtraction only where they are detected. The efficiency of the approach is demonstrated and quantified using simulated and real data.

Resumo Limpo

qualiti astrophys imag produc mean generalis least squar gls approach may degrad presenc artifici structur obvious present sky problem affect differ degre imag produc instrument onboard european space agenc esa herschel satellit paper analys artifact introduc method remov method base postprocess gls imag estim remov artifact subtract origin imag find drawback method slight increas background nois howev can mitig detect artifact perform subtract detect effici approach demonstr quantifi use simul real data

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