INVESTIGADORES
IEMMI Claudio Cesar
artículos
Título:
Image enhancement by spatial frequency post-processing of images obtained with pupil filters
Autor/es:
ESTÉVEZ, IRENE; ESCALERA, JUAN C.; STEFANO, QUIMEY PEARS; IEMMI, CLAUDIO; LEDESMA, SILVIA; YZUEL, MARÍA J.; CAMPOS, JUAN
Revista:
OPTICS COMMUNICATIONS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2016 vol. 380 p. 21 - 27
ISSN:
0030-4018
Resumen:
The useofapodizingorsuperresolving filters improvestheperformanceofanopticalsystemindifferentfrequencybands.ThisimprovementcanbeseenasanincreaseintheOTFvaluecomparedtotheOTFforthe clearaperture.In thispaperweproposeamethodtoenhancethecontrastofanimageinbothitslowanditshighfrequencies.ThemethodisbasedonthegenerationofasyntheticOpticalTransferFunction,bymulti-plexingtheOTFsgivenbytheuseofdifferentnon-uniformtransmission filters onthepupil.Weproposeto capturethreeimages,oneobtainedwithaclearpupil,oneobtainedwithanapodizing filter thatenhances thelowfrequenciesandanotheronetakenwithasuperresolving filter thatimprovesthehighfrequencies.IntheFourierdomainthethreespectraarecombinedbyusingsmoothedpassband filters,and thentheinversetransformisperformed.Weshowthatwecancreateanenhancedimagebetterthanthe imageobtainedwiththeclearaperture.Toevaluatetheperformanceofthemethod,bartests(si-nusoidal tests)withdifferentfrequencycontentareused.Theresultsshowthatacontrastimprovementin thehighandlowfrequenciesisobtained.
