Author/Authors :
Chen, Xiayu College of Engineering and Technology - Tianjin Agricultural University - Tianjin 300000, China , Zeng, Yanan College of Engineering and Technology - Tianjin Agricultural University - Tianjin 300000, China , Liu, Yuan College of Engineering and Technology - Tianjin Agricultural University - Tianjin 300000, China , Su, Kangyan College of Engineering and Technology - Tianjin Agricultural University - Tianjin 300000, China , Lu, Junsheng State Key Laboratory of Precision Measuring Technology and Instruments - Tianjin University - Tianjin, China , Chang, Xinyu State Key Laboratory of Precision Measuring Technology and Instruments - Tianjin University - Tianjin, China , Hu, Xiaodong State Key Laboratory of Precision Measuring Technology and Instruments - Tianjin University - Tianjin, China
Abstract :
Adigitalhologram-optimizingmethodwasproposedtoimprovetheimagingqualityofdual-wavelengthdigitalholographicmicroscopy(DDHM)byreducingthephasenoiselevel.Inourpreviouswork,phasenoisereductionwasachievedbydual-wavelengthdigitalimage-planeholographicmicroscopy(DDIPHM).Intheoptimizationmethodinthispaper,thephasenoisewasfurtherreducedbyenhancingthereal-imagetermandsuppressingeffectsofthezero-orderterminthefrequencyspectrumofadigitalhologram.Practically,thecarrierfrequencyofthereal-imagetermhasthecorrespondencewithinterferencefringesinthehologram.Mathematically,thefirstorderintrinsicmodefunction(IMF1)inbidimensionalempiricalmodedecomposition(BEMD)hassimilarcharacteristicstothegrayscalevaluesofidealinterferencefringes.Therefore,withthecombinationofDDIPHMandBEMD,byutilizingthecharacteristicsofIMF1,thedigitalhologramwasoptimizedwithpurifiedinterferencefringes,enhancingthereal-imagetermsimultaneously.Finally,thevalidityoftheproposedmethodwasverifiedbyexperimentalresultsonamicrostep.
Keywords :
Method , Improve , Imaging Quality , Dual-Wavelength Digital Holographic Microscopy , BEMD , DDIPHM
