Muaj ntau hom scanners, thiab feem ntau ntes cov ntaub ntawv tib yam-ua rau cov ntawv nyeem, cov duab lag luam, duab, lossis zaj duab xis.
Ntawm no yog li cas lub tshuab luam ntawv siv cov ntaub ntawv lub cev, rov tsim nws cov ntsiab lus, thiab tom qab ntawd hloov cov ntaub ntawv mus rau hauv cov ntaub ntawv khoos phis tawj uas tuaj yeem rub tawm thiab faib tawm digitally.
Charged-Coupled Device (CCD) Array
Thaum lub tshuab luam ntawv tau tsim los ntawm ntau qhov sib txawv, cov khoom tseem ceeb yog cov khoom siv sib txuas (CCD) array. CCD array yog ib phau ntawm lub teeb-sensitive diodes uas hloov photons (lub teeb) rau hauv electrons lossis hluav taws xob. Cov diodes no paub ntau dua li photosites.
Cov duab yog qhov nkag siab rau lub teeb. Lub teeb ci dua, qhov hluav taws xob ntau dua. Nyob ntawm tus qauv scanner, cov duab scanned lossis cov ntaub ntawv pom nws txoj hauv kev mus rau CCD array los ntawm ntau lub lenses, lim, thiab iav. Cov khoom no ua rau lub taub hau scan. Thaum lub sijhawm luam theej duab, lub taub hau scan tau dhau los ntawm cov ntaub ntawv lossis khoom lossis raug xa mus.
Qee lub tshuab luam ntawv yog ib qho dhau los, thiab qee qhov yog peb-dhau, uas txhais tau tias lub tshuab luam ntawv khaws cov khoom raug luam tawm hauv ib qho dhau los lossis peb. Ntawm lub tshuab luam ntawv peb-pass, txhua qhov dhau los khaws cov xim sib txawv (liab, ntsuab, lossis xiav), thiab tom qab ntawd software rov tsim peb RGB xim raws, rov qab kho cov duab qub. Cov scanners niaj hnub no feem ntau yog ib zaug dhau, nrog lub lens ua qhov sib cais ntawm peb cov xim raws.
Hu rau Duab Sensor
Lwm tus nqi qis dua cov duab array thev naus laus zis yog kev sib cuag duab sensor (CIS). CIS hloov CCD array. Ntawm no, cov duab sensor mechanism muaj 300 txog 600 sensors uas nthuav dav dav ntawm lub platen lossis scanning cheeb tsam. Thaum ib daim duab luam theej duab, cov LEDs sib xyaw ua ke los muab lub teeb dawb, ua kom pom cov duab, uas yog ntes los ntawm cov sensors.
CIS scanners feem ntau tsis muab tib theem ntawm kev ua tau zoo thiab kev daws teeb meem xa los ntawm CCD-based machines. Txawm li cas los xij, cov tshuab luam ntawv no feem ntau yog nyias, sib dua, thiab pheej yig dua.
Kev daws teeb meem thiab xim qhov tob
Qhov kev daws teeb meem koj xaiv nyob ntawm seb koj npaj siv daim duab li cas. HD computer saib, ntsiav tshuaj, thiab smartphones tuaj yeem txhawb kev daws teeb meem txog 96 dots ib nti (dpi). Yog tias koj luam theej duab cov duab ntawm qhov kev daws teeb meem siab dua li nws tuaj yeem pom, cov ntaub ntawv ntxiv raug pov tseg.
Cov duab hauv daim ntawv qhia siab kawg thiab luam tawm yog ib zaj dab neeg sib txawv. Rau qhov ua tau zoo tshaj plaws, koj yuav tsum tau luam theej duab tsawg kawg 300 dpi. Ntau yog ib txwm zoo dua, tshwj xeeb tshaj yog tias koj xav tau kom loj cov duab thaum lub sij hawm layout.
Xim qhov tob txhais cov xim ntawm cov duab (lossis luam theej duab) muaj. Cov muaj peev xwm yog 8-ntsis, 16-ntsis, 24-ntsis, 36-ntsis, 48-ntsis, thiab 64-ntsis. 8-ntsis txhawb 256 xim lossis ntxoov grey, thiab 64-ntsis txhawb nqa trillions ntawm cov xim-ntau dua li tib neeg qhov muag pom tau.
Cov kev daws teeb meem siab thiab cov xim sib sib zog nqus ua kom zoo dua scan. Cov xim, qhov zoo, thiab cov ntsiab lus yuav tsum nyob ntawd ua ntej koj luam theej duab. Txawm tias koj lub scanner zoo npaum li cas, nws tsis tuaj yeem ua txuj ci tseem ceeb.
