Uhlolojikelele lwesithwebuli sebhakhodi

Uhlolojikelele lwesithwebuli sebhakhodi

Lapho sithinta isibhamu sokuskena ibhakhodi, sivamise ukuhlangana namagama amaningi obuchwepheshe anzima, njengokucaca kokubona (i-optical resolution), ukulungiswa okuphezulu (ubukhulu bokucaca), ukulungiswa kombala (ukujula kombala), imodi yokuskena, imodi yokusebenzelana ( ukuxhumana kokuxhumana), njll. Manje ake sethule ulwazi oluyisisekelo lwalezi zibhamu zokuskena ibhakhodi, ukuze sibe nokuqonda kangcono izibhamu zokuskena ibhakhodi, ezingasetshenziswa futhi njengereferensi lapho sithenga izibhamu zokuskena ibhakhodi. Eqinisweni, isithwebuli sebhakhodi, isibhamu sokuskena ibhakhodi kanye no-isifundi sebhakhodi ziyinto efanayo, kodwa zibizwa ngokuhlukile. Uhlobo lweskena sebhakhodi:

Iskena sebhakhodi ephathwayo. Iskena sebhakhodi esiphathwa ngesandla siwumkhiqizo owakhiwe ubuchwepheshe owethulwa ngo-1987. Sibukeka njengesithwebuli sebhakhodi esisetshenziswa ukheshi esitolo. Ubuchwepheshe be-CIS busetshenziswa kuzikena eziningi zebhakhodi yokubamba. Ukulungiswa kwe-optical kungu-200dpi. Kunezinhlobo ezimnyama nezimhlophe, ezimpunga nombala, uhlobo lwazo lombala ngokuvamile olunombala oyibhithi elingu-18. Eminye imikhiqizo yeqophelo eliphezulu futhi isebenzisa i-CCD njengesisetshenziswa esizwela ukuthwebula izithombe, esingabona umbala wangempela kancane ngomphumela omuhle wokuskena.

Iskena sebhakhodi yerola encane. Lona umkhiqizo omaphakathi wesithwebuli sebhakhodi ephathwayo kanye nesithwebuli sebhakhodi yedeskithophu (kukhona imikhiqizo emisha eminyakeni yakamuva, eyaziwa ngokuthi isithwebuli sebhakhodi yamanothibhuki ngenxa yokunikezwa kwamandla okwakhelwe ngaphakathi kanye nosayizi omncane). Iningi lalo mkhiqizo lamukela ubuchwepheshe be-CIS, obunokulungiswa kwe-optical okungu-300dpi, umbala kanye ne-grayscale, futhi imodeli yombala ngokuvamile inombala wamabhithi angu-24. Kukhona futhi izikena ezimbalwa zebhakhodi ye-roller encane esebenzisa ubuchwepheshe be-CCD, umphumela wokuskena ungcono kakhulu kunemikhiqizo yobuchwepheshe be-CIS, kodwa ngenxa yokulinganiselwa kwesakhiwo, ivolumu ngokuvamile inkulu kakhulu kunemikhiqizo yobuchwepheshe be-CIS. Idizayini yohlobo lwerola encane iwukulungisa ilensi yesithwebuli sebhakhodi, bese uhambisa into ukuthi iskenwe ngelensi ukuze iskenwe. Ngokusebenza, njengephrinta, into ezoskenwa kufanele idlule emshinini bese ithunyelwa. Ngakho-ke, into ezoskenwa ayikwazi ukujiya kakhulu. Inzuzo enkulu yalesi sithwebuli sebhakhodi ukuthi sincane kakhulu, kodwa sinemikhawulo eminingi ngenxa yokusetshenziswa kwayo. Isibonelo, ingaskena kuphela iphepha elincanyana, futhi ububanzi abukwazi ukudlula usayizi wesithwebuli sebhakhodi.

Iskena sebhakhodi yeplatifomu. Eyaziwa nangokuthi isithwebuli sebhakhodi eyisicaba kanye nesikena sebhakhodi yedeskithophu, izikena eziningi zebhakhodi emakethe zingamaskena webhakhodi eyisicaba, okuyiwona ajwayelekile manje. Ukulungiswa kokubonakalayo kwalolu hlobo lwesithwebuli sebhakhodi kusuka ku-300dpi kuya ku-8000dpi, amabhithi ombala asukela ku-24 kuya ku-48, futhi ifomethi yokuskena ngokuvamile i-A4 noma i-A3. Inzuzo yohlobo oluyisicaba ukuthi inqobo nje uma ikhava yesithwebuli sebhakhodi ivuliwe, izincwadi, amaphephandaba, omagazini kanye nezithombe ezingezinhle zingabekelwa ukuskenwa, okuyinto elula kakhulu, futhi umphumela wokuskena ungcono kakhulu kuzo zonke izinhlobo ezivamile. yezikena zebhakhodi.

Kuphinde kube nezithwebuli zekhodi ye-noodle ezinkulu, izikena zebhakhodi yepeni, izikena zebhakhodi ezinegethivu zokuskena kwefomethi enkulu (qaphela ukuthi izikena zebhakhodi eyisicaba azingezi ngokuskena, ngakho umphumela uba ngcono kakhulu. , futhi intengo vele iyabiza), izikena zebhakhodi ngokomzimba (hhayi izikena zebhakhodi eziyisicaba ezinekhono lokuskena ngokomzimba, okucishe kufane namakhamera edijithali), Kukhona futhi izikena eziningi zebhakhodi ye-roller ezisetshenziswa ikakhulukazi emkhakheni wokuphrinta nokuhlela.