Eigenfacemethodusedinfacerecognitionisintroducedtoreducethepatternofinterferencefringesappearingintheabsorptionimageofcoldrubidiumatomcloudtrappedbyanatomchip.Thestandardmethodforprocessingtheabsorptionimageisproposed,andtheoriginoftheinterferencefringesisanalyzed.Comparedwiththestandardprocessingmethodwhichusesonlyonereferenceimage,wetakeadvantageoffiftyreferenceimagesandreconstructanewreferenceimagewhichismoresimilartotheabsorptionimagethanallofthefiftyoriginalreferenceimages.Thenobviousreductionofinterferencefringescanbeobtained.