Cov duab sensor hauv lub koob yees duab (lossis lub koob yees duab digital) yog qhov ua rau lub koob yees duab digital "digital." Muab qhov yooj yim, ib qho duab sensor hloov lub teeb ntes los ntawm koj lub koob yees duab lub lens thiab hloov nws mus rau hauv cov teeb liab digital. Lub teeb digitized tau ua tiav thiab khaws cia rau hauv koj lub koob yees duab lub cim xeeb ua cov ntaub ntawv video digital koj tuaj yeem saib tom qab koj lub computer lossis TV. Ib sab ntawm lub lens nws tus kheej, cov duab sensor yog lub hauv paus tseem ceeb uas ua kom cov yees duab zoo.
Muaj ob lub ntsiab ntawm lub koob yees duab duab sensors: charged coupled device (CCD) thiab complementary metal oxide semiconductor (CMOS). Ob hom duab sensor tshuab muaj ntau pua txhiab lossis ntau lab pixels. Xav txog lub pixel raws li lub thoob me me uas ntes lub teeb thiab tig mus rau hauv lub teeb liab hluav taws xob.
Yuav ua li cas CMOS thiab CCD Sensors txawv
Hauv CCD duab sensor, pixels ntes lub teeb thiab txav mus rau ntawm ntug ntawm lub nti, qhov twg nws tau hloov mus rau hauv lub teeb liab digital. Hauv CMOS sensor, lub teeb hloov pauv ntawm pixel nws tus kheej. Tsis siv hluav taws xob conveyor yuav tsum tau siv. Qhov sib txawv me me no tseem ceeb. Vim tias lub teeb liab tsis tas yuav raug thauj mus rau ntawm ntug ntawm lub nti rau kev hloov dua siab tshiab, CMOS sensor yuav tsum muaj lub zog tsawg dua los ua haujlwm. Qhov ntawd txhais tau tias, tag nrho lwm yam sib npaug, lub koob yees duab nrog lub CMOS sensor muab lub roj teeb zoo dua li ib qho nrog CCD. Tau kawg, txhua yam yuav luag tsis sib npaug, yog li tsis txhob cia li xav tias CMOS camcorder muaj lub roj teeb zoo dua li lwm qhov CCD.
Tau ntau xyoo, CCD duab sensors tau suav tias yog cov thev naus laus zis zoo tshaj plaws raws li cov duab thiab yees duab zoo. Tab sis, CMOS sensors tau ua kom muaj kev vam meej hauv lub tuam tsev ntawd thiab tam sim no pom ntawm cov koob yees duab loj zuj zus ntawm txhua qib nqi.
Yog li, thaum CMOS thiab CCD cov duab sensors sib txawv, qhov sib txawv no yuav tsis tuav ntau lub ntsiab lus rau cov neeg siv khoom nruab nrab. Koj yuav tsum tau them tsawg dua rau hom sensor hauv koj lub camcorder thiab ntau xim rau cov pixel suav thiab lub cev loj ntawm lub sensor.
Pixel suav thiab lawv txhais li cas
Thaum tshuaj xyuas cov koob yees duab tshwj xeeb, koj feem ntau pom ob pawg ntawm cov lej teev los ntawm lub sensor: tag nrho pixel suav thiab suav pixel zoo. Qhov suav tag nrho yog hais txog tag nrho cov pixels ntawm lub sensor, tab sis qhia tau zoo rau koj tias pes tsawg pixels yuav siv thaum thaij video lossis tseem duab. Yog li, ua tib zoo saib xyuas cov txiaj ntsig pixel suav thaum nrhiav kev daws teeb meem ntawm koj cov vis dis aus.
Qhov txiaj ntsig pixel suav yog qhov tseem ceeb rau lwm qhov laj thawj: nws pab koj txiav los ntawm qee qhov kev lag luam hype. Coj Camcorder A. Nws hais tias nws tuaj yeem thaij duab 10-megapixel (piv txwv li daim duab nrog 10 lab pixels hauv nws). Tab sis, thaum koj saib tus naj npawb ntawm cov pixels zoo ntawm nws cov duab sensor, koj pom nws tsuas yog 4-megapixel sensor. Yuav ua li cas 4-megapixel duab sensor coj 10-megapixel duab? Nws tau ua tiav los ntawm tus txheej txheem hu ua interpolation. Raws li txoj cai dav dav, koj yuav tsum txo qis qhov zoo ntawm cov duab tsim los ntawm kev cuam tshuam. Hloov chaw, siv tus lej ntawm cov pixels zoo ntawm lub koob yees duab sensor raws li kev qhia rau qhov kev daws teeb meem tiag tiag ntawm koj cov duab.
Qhov tseem ceeb ntawm daim duab Sensor Loj
Tus naj npawb ntawm pixels ntawm cov duab sensor tsis yog qhov cuam tshuam nkaus xwb uas cuam tshuam rau qhov zoo ntawm cov yeeb yaj kiab. Lub cev loj ntawm lub sensor tseem ceeb thiab. Cov duab loj dua tuaj yeem ntes lub teeb ntau dua li cov me me, txawm tias lawv muaj tsawg dua pixels. Tias yog vim li cas, thaum tsawg tus lej, cov pixels loj dua thiab yog li tuaj yeem ntes tau ntau lub teeb.
Qhov no yog vim li cas koj thiaj li yuav pom cov koob yees duab tshaj tawm tsis yog tus lej ntawm pixels ntawm cov duab sensor tab sis qhov loj ntawm lub sensor nws tus kheej (feem ntau nyob rau hauv feem ntawm ib nti). Koj zoo dua los yuav lub koob yees duab nrog cov duab loj dua txawm tias nws muaj pixels tsawg dua li cov qauv sib tw nrog lub ntsuas me me thiab ntau pixels.
