Thaum lub koob yees duab ntsuas tus nqi ntawm lub teeb nws tau ntes nyob rau hauv txhua pixel ntawm qhov tau txais, yeej ib txwm muaj qee qhov yuam kev.Qhov tsis raug no hu ua Read Noise, lossis Readout Noise.

Raws li cov cim qhia suav nrog ntau tus lej ntawm photons raug ntes thiab hloov mus rau hauv cov teeb liab hluav taws xob ntsuas hauv electrons, lub suab nrov nyeem tau teev nyob rau hauv cov xov tooj ntawm electrons (e-).Vim qhov tseeb ntawm cov khoom siv hluav taws xob hauv cov koob yees duab kev tshawb fawb niaj hnub no, lub suab nrov no feem ntau yog me me, ntawm qhov kev txiav txim ntawm 1 txog 3e- rau cov koob yees duab qis.

Rau cov ntawv thov nrog cov teeb pom kev siab, xws li qhov twg ntau txhiab tus photons raug ntes los ntawm txhua pixel, qhov kev ua yuam kev no yog qhov me me piv rau cov teeb liab, yog li nyeem cov suab nrov tsawg dua 5e- tuaj yeem tsis quav ntsej zoo.Piv txwv li, piv rau lub teeb liab ntawm 2,000 photoelectrons, nyeem cov suab nrov ntawm txawm tias 10e- yuav ua rau tsawg dua 3% qhov sib txawv rau qhov sib piv ntawm cov teeb liab-rau-suab nrov, thiab tej zaum yuav imperceptible.Txawm li cas los xij, rau theem teeb pom kev tsawg qhov twg photon suav yuav nyob hauv kaum tawm ntawm photons, tsis tshua muaj suab nrov tuaj yeem ua lub luag haujlwm tseem ceeb hauv lub teeb liab rau suab nrov piv thiab cov duab zoo.

Vim lawv cov vaj tse sib npaug, txhua lub koob yees duab CMOS nthuav tawm kev faib tawm ntawm cov suab nrov ntawm pixel mus rau pixel.Yog li ntawd, qee zaum ob qhov tseem ceeb rau kev nyeem suab nrov hauv e- raug muab tso rau ntawm cov ntawv qhia tshwj xeeb.Tus nqi nruab nrab tau teev tseg kom 50% ntawm pixels muaj tus nqi nyeem suab nrov ntawm lossis hauv qab daim duab no, thiab muab kev nkag siab rau tus nqi nyeem nrov nrov rau lub koob yees duab.Lub hauv paus-Mean-Square (RMS) tus nqi qhia txog lub hauv paus txhais tau tias square ntawm tag nrho cov kev nyeem cov suab nrov, muab kev nkag siab rau qhov loj ntawm cov suab nrov pixels uas tsis suav nrog hauv qhov ntsuas nruab nrab.

Qee lub koob yees duab tshwj xeeb qis qis muaj lub suab nrov hu ua Correlated Multi-Sampling hom, lossis CMS.Hauv hom no, qee qhov kev txo qis ntawm tus ncej yog pauv rau kev ntsuas qhov tseeb ntau dua, ua rau kev nyeem cov suab nrov tsuas yog nyob ib puag ncig 1.1e- (Median) / 1.2e- (RMS).