一,WimbengeLAma-Ens asetshenziswa ku-CCTVCamera?
Amakhamera we-CCTV angasebenzisa izinhlobo ezahlukahlukene zamalensi ngokuya ngohlelo lwazo oluhlosiwe kanye nomkhakha owuthandayo wokubuka. Nazi ezinye izinhlobo ezijwayelekile zamalensi asetshenziswa kumakhamera we-CCTV:
I-lens elungisiwe: Lawa ma-lens anobude obugxile obuhleliwe futhi angeke alungiswe. Zisetshenziselwa izinhlelo zokusebenza lapho inkambu yokubuka ingadingi ukushintshwa.
Ilensi ye-Varifocal: Lawa ma-lens avumela umsebenzisi ukuthi alungise ubude obugxilekile ngakho-ke inkambu yokubuka. Zilusizo lapho ikhamera ifakiwe endaweni lapho ibanga phakathi kwekhamera kanye nesihloko singahluka.
Zoom lens: Lawa ma-lens afana ne-varifocal lens kepha anikeze uhla olubanzi kakhulu lokulungiswa kobude obugxile kakhulu. Bavumela umsebenzisi ukuthi asondeze noma aphume esifundweni ngaphandle kokuhambisa ikhamera.
I-Pinhole Lens: Lawa ma-lens anokuhlehlisa okuncane kakhulu, okuvumela ikhamera icashwe ngaphakathi kwento encane noma edongeni
Ukukhethwa kwamalensi kuncike kwizidingo ezithile zohlelo lokusebenza, njengebanga lesihloko, izimo zokukhanyisa, kanye nenkambu oyifunayo.
二,WimbengeDoesI-CCTVCno-ameraLama-eeDo?
Ilensi ingenye yezinto ezibaluleke kakhulu zekhamera ye-CCTV, ngoba inesibopho sokuthwebula nokubheka ukukhanya kwesithombe sekhamera. I-lens inquma inkambu yokubuka kanye nenani lokukhanya elingena kwikhamera, elingaba nomthelela omkhulu kwikhwalithi nokucaca kwesithombe esiphumela.
Amalensi asebenza ngokugoba imisebe yokukhanya edlula kuyo, ngakho-ke ahlangana endaweni yokugxila kwi-sensor yesithombe. Ibanga kusuka ku-lens liye kwi-sensor yesithombe, kanye ne-curvature yelensi, inquma ubude obugxile kanye ne-angle yokubuka ikhamera.
Ilensi yekhamera ye-CCTV ingalungiswa noma iguqune, kuya ngezidingo ezithile zohlelo lokusebenza. Ama-lens ahleliwe anobude obugxile kanye nensimu yokubuka, ngenkathi amalensi aguqukayo, njenge-varifocal noma amalensi okusondeza, angashintshwa ukuze aguqule ubude obugxile kanye nomkhakha wokubuka.
Ngamafuphi, ilensi yekhamera ye-CCTV idlala indima ebalulekile ekuthumbeni izithombe ezisezingeni eliphakeme ne-video footage. Ngokulawula inani lokukhanya elingena kwikhamera kanye ne-angle yokubuka, i-lens isiza ukuqinisekisa ukuthi ikhamera ithumba udaba oluhlosiwe ngezinga olufunayo lemininingwane nokucaca.
三,KanjaniCHoose a CCTVCno-ameraLama-Ens?
Ukukhetha ilensi yekhamera ye-CCTV efanele kubalulekile ukuze uthole ikhwalithi yesithombe esingcono kakhulu sohlelo lwakho lokuphepha. Nazi ezinye izinto okufanele zicatshangelwe lapho ukhetha aIlensi ye-CCTV:
Ubude obugxile: Ubude obugxile belensi bunquma inkambu yekhamera yokubuka, noma engakanani yesigameko ikhamera engabanjwa. Uma udinga ukuqapha indawo enkulu, ilensi ebanzi enama-angle anokugxila okufushane izodingeka. Ngokuqapha indawo ethile, ilensi emincane engela ngobude obuphelele obufanelekile. Ungasebenzisa ama-Calculator we-inthanethi ukuthola ubude obufanele bokugxila ukuze uhlelo lwakho lokusebenza olususelwa ebangeni nesihloko nakwinsimu oyifunayo.
Umphetho: Isithasiselo silingana nokuvulwa kwelensi evumela ukukhanya ukufaka ikhamera. I-aperture enkulu (i-F-F-Number) izovumela ukukhanya okuningi ukufaka ikhamera, okuholela ezithombeni ezikhanyayo ezimeni eziphansi zokukhanya. Kodwa-ke, ukuhlukunyezwa okukhudlwana kungahle kuholele ekujuleni kwensimu, okungadala izinto ezingaphambili noma ngemuva ukuze zibonakale zifiphele.
Ukuphathakwa: Qinisekisa ukuthi ilensi iyahambisana nemodeli yakho yekhamera kanye nosayizi we-sensor. Amakhamera ahlukene angaba nezinhlobo ezahlukene zokukhwela, futhi akuzona wonke amalensi ahambelana nawo wonke amamodeli ekhamera.
Ikhwalithi yendatshana: Khetha ilensi ngekhwalithi enhle yesithombe, ezoqinisekisa ukuthi ikhamera ithumba izithombe ezicacile, ezinemininingwane.
Ibhajethi: Izindleko zeAma-lens wekhamera yezokuphephaIyahlukahluka ngokuya ngobude obugxile, i-aperture, nekhwalithi yesithombe. Nquma isabelomali sakho bese ukhetha ilensi ehlangabezana nezidingo zakho futhi iwele ngaphakathi kwesabelomali sakho.
Ngamafuphi, lapho ukhetha ilensi yekhamera ye-CCTV, cabanga ngobude obugxile, i-aperture, ukuhambisana, ikhwalithi yesithombe, nesabelomali ukuze uqinisekise ukuthi uthola ikhwalithi yesithombe esingcono kakhulu sohlelo lwakho lokuphepha.
Isikhathi sePosi: Meyi-05-2023
