Amalensi e-CCTVmanje zisetshenziswa kabanzi, kodwa ukuze kuhambisane nesimo esithile, kudingeka kucatshangelwe imingcele eminingi yobuchwepheshe kanye nezidingo zangempela zohlelo lokusebenza, njengokuchaza ngokucacile inhloso yokuqapha, ibanga lokuqapha, kanye nendawo yokuqapha.
Kulesi sihloko, sizobheka ngokuningiliziwe ukuthi ungakhetha kanjani amalensi e-CCTV afanele ezimweni ezahlukahlukene ezithile.
Ukukhetha ilensi ye-CCTV efanele isimo esithile kudinga ukucatshangelwa okubanzi kwalezi zici ezilandelayo:
1.Chaza izidingo zesimo sokuqapha
Ngaphambi kokukhetha ilensi ye-CCTV, kubalulekile—njengesinyathelo esiyisisekelo—ukuqale ukhombe izidingo ezithile zokuqapha zesimo sesicelo esihlosiwe. Okokuqala, kubalulekile ukucacisa izici zomuntu oqondisa kanye nendawo.
Isibonelo, qinisekisa ukuthi umgomo uwukubona indawo enkulu noma imininingwane emincane, ukuthi ibanga lokuqapha lifushane noma lide, nokuthi indawo yokuqapha ingaphakathi noma ngaphandle, nokuthi izimo zokukhanya zinjani. Ekugcineni, ilensi efanele kumele ikhethwe ngokusekelwe kulezi zidingo zokuqapha ezihlukile.
2.Ukufanisa amapharamitha ngelensi yokhiye
Ubude be-focal, i-aperture, insimu yokubuka, kanye nesisombululo konke kuyimingcele yelensi ebalulekile okudingeka icatshangelwe:
(1) Ubude be-focal. Ubude be-focal buyinto ebalulekile ekunqumeni kokubili insimu yokubuka kanye nebanga lokuqapha. Ubude obuhlukene be-focal buhambisana nezimo zokuqapha ezihlukile: uma ubude be-focal bufushane, insimu yokubuka ibanzi; ngokuphambene nalokho, uma ubude be-focal bude, ibanga lokubuka liba likhulu.
Isibonelo, ubude obuqondile obungu-2.8mm bufanelekela ukuqapha amabanga angaphakathi kwamamitha ayi-10 kanye nensimu yokubuka engama-degrees angaba yi-100, okwenza bufanelekele ukuqapha amarejista emali angaphakathi, ama-lifti, nezinye izindawo ezingaphakathi kobubanzi obuthile; ubude obuqondile obungu-8mm noma ngaphezulu bufanelekela ukuqapha amabanga angaphezu kwamamitha ayi-15, okwenza bufanelekele ukuqapha okuningiliziwe kwebanga elide ezindaweni ezinkulu njengezindawo zokugcina impahla kanye nezindawo zokupaka.
Ubude be-focal buyipharamitha ebalulekile okufanele icatshangelwe
(2) Imbobo. Imbobo inquma inani lokukhanya okungena kwikhamera, ithinta ngqo umphumela wesithombe ebusuku. Imbobo enkulu ivumela ukukhanya okwengeziwe ukuthi kungene, okuholela ezithombeni ezicacile ezindaweni ezinokukhanya okuncane futhi kwenze kufaneleke ezimweni zokuqapha zasebusuku ngaphandle kokukhanya okwengeziwe. Imbobo encane ifaneleka kangcono ezindaweni ezikhanyiswe kahle lapho kudingeka khona ukucaca kwendawo yonke—njengasemigqeni yokukhiqiza noma ezindaweni zokugcina impahla.
Ezindaweni zangaphandle noma kwezinye izindawo lapho ukukhanya kwe-ambient kushintshashintsha khona kakhulu, kunconywa ukukhethailensiifakwe isici se-auto-iris, esingazilungisa ngokuzenzakalelayo ngenxa yezimo zokukhanya ezishintshayo.
(3) Insimu Yokubuka. Insimu yokubuka ihlobene eduze nobude obuqondile, futhi inquma ngqo ububanzi obungambozwa ilensi. Ngokuvamile, amalensi ane-engeli ebanzi anensimu yokubuka engaphezu kuka-90°, okwenza afanelekele ukubhekwa okukhulu ezindaweni ezifana nezindawo zokupaka kanye nezigcawu zomphakathi; amalensi e-telephoto anensimu yokubuka engaphansi kuka-30° futhi afanelekela ukuqapha okuningiliziwe, ibanga elide—isibonelo, ezicelweni ezibandakanya ukuqashelwa kwepuleti lelayisensi kanye nokuqashelwa kobuso.
(4) Isixazululo. Uma isixazululo selensi siphezulu, isithombe sizocaca kakhulu. Kodwa-ke, isixazululo kumele sihambisane nezidingo zemininingwane zethagethi eliqashwe. Akungcono ngaso sonke isikhathi ukuba nesisombululo esiphezulu.
Ngesikhathi esifanayo, isinqumo selensi uqobo kumele sihambisane nesinqumo sekhamera. Amakhamera anencazelo ephezulu kudingeka ahlanganiswe namalensi anesinqumo esifanayo, ngaphandle kwalokho imiphetho yesithombe izofiphala; amalensi anesinqumo esiphezulu ahlanganiswe namakhamera anesinqumo esiphansi nawo abangela ukulahleka kwesinqumo.
Isibonelo, ilensi engu-2-megapixel ingahlangabezana nezidingo eziyisisekelo zokuqapha ezinemininingwane, njengokubona izinhlaka zabantu kanye nokuziphatha okuvamile, futhi ifanelekela ukuqapha okuphelele kwemigwaqo evamile kanye nezindawo zokugcina impahla.
(5) Ukukhweza kanye nezinzwa. Ukukhweza ilensi okuvamile kufaka phakathi ukukhweza kwe-M12, C, kanye ne-CS. Ngaphambi kokufakwa, kubalulekile ukuqinisekisa ukuthi ukukhweza ilensi kufana nesixhumi esibonakalayo sekhamera; ukwehluleka ukwenza kanjalo kungabangela ukungakwazi ukukhiqiza isithombe esicacile noma ngisho nomonakalo wemishini.
Isimiso esifanayo sisebenza ngobukhulu besenzwa: indilinga yesithombe selensi kumele ihambisane nobukhulu besenzwa yekhamera; ngaphandle kwalokho, isithombe sisengozini enkulu yokufiphaza, okwenza kube nzima ukuthwebula isithombe esicacile.
Kubalulekile ukufanisa amapharamitha amalensi e-CCTV
3.Ukuphakama kokufakwa kanye ne-engeli
Ukuphakama kokufakwa kanye ne-engeli yeilensifuthi ikhamera nayo ithinta imiphumela yokuqapha. Ngokuvamile, uma ikhamera iphakanyisiwe phezulu, indawo yayo yokumboza evundlile inkulu. Uma uthwebula umbono obheke phansi usuka endaweni ephakeme, kubalulekile ukwandisa ubude obuqondile ukuze ugweme ukuchitha isikhala phezulu kohlaka.
4.Amakhono okuqapha ebusuku
Uma isimo sohlelo lokusebenza sidinga ukubhekwa ebusuku, kuyadingeka futhi ukucabangela ilensi esekela umbono wasebusuku we-infrared (IR) futhi enomsebenzi wokuhlunga we-IR othomathikhi, ukuze kuqinisekiswe izithombe ezicacile kokubili ukuqapha emini nasebusuku.
5.Ukuzivumelanisa nezimo kwemvelo kanye nokuqina kwayo
Uma ukhetha amalensi e-CCTV, kubalulekile futhi ukucabangela ukuzivumelanisa nezimo kwemvelo kanye nokuqina—ikakhulukazi amalensi ahloselwe ukusetshenziswa ngaphandle. Kufanele kuqashelwe ngokukhethekile ukuthi anezici zokuvikela, njengokumelana nothuli namanzi, ukuvimbela ukungena kwamanzi emvula okungaholela ekulimaleni kwelensi noma ekwehlulekeni kwesithombe.
Ukukhethwa kwamalensi e-CCTV kumele futhi kucabangele ukuzivumelanisa nezimo kwemvelo kanye nokuqina kwayo
6.Izinhlelo zokukhetha zezimo ezahlukene zohlelo lokusebenza
(1) Ukuqapha ngaphakathi endlini: Okuklanyelwe ngokuyinhloko ukumboza amakamelo aphelele—njengegumbi lokuphumula—inketho ekhethwayo iwukuba ne-engeli ebanziilensienobude obuqondile obungaba ngu-4mm kanye nensimu yokubuka engaba ama-degrees angu-70, okususa isidingo sokulungiswa kwama-engeli njalo.
(2) Iminyango yokungena kanye nokuqapha iphaseji: Ngokuyinhloko igxile ekuqapheni izindlela ezincane, lokhu kulungiselelwa kuhlose ukubamba ngokusobala ukunyakaza kwabantu nezinto ezisebangeni eliphakathi. Kunconywa amalensi anobude obuqondile obungu-2.8mm noma u-4mm ukuqinisekisa ukumbozwa okude. Ukuphakama kokufakwa kwamamitha angu-2.5 kuya kwangu-3 kuyalulekwa ukuvimbela i-engeli eyehla kakhulu, engabangela ukuvinjelwa kobuso.
(3) Ukuqapha indawo yokupaka/indawo yokugcina impahla: Umgomo oyinhloko ukubona ngokucacile amapuleti elayisensi noma izici zabasebenzi. Ungakhetha ilensi yobude obuqondile obungu-8mm noma ngaphezulu ukuze ubone amapuleti elayisensi namamodeli ezimoto ebangeni elingamamitha angu-15-30 futhi ubone ubuso ngokucacile. Uma ufaka ngaphandle, qiniseka ukuthi unaka isilinganiso selensi esingangeni manzi nesivikela uthuli.
(4) Ukuhlolwa kokukhokha esitolo/ihhovisi: Isikhala sivalekile, futhi kuyadingeka ukulinganisela umbono nemininingwane. Ukugxila okuyinhloko kusemvelweni jikelele kanye nemininingwane. Amalensi angu-4mm noma angu-6mm angakhethwa. Uma kudingeka ukuqopha ngokucacile izinqubo zokuthengiselana noma izici zobuso, kunconywa ilensi engu-6mm.
Kunezinketho ezahlukene zezimo ezahlukene zohlelo lokusebenza
(5) Ukuqapha indawo evulekile enkulu: Ezindaweni ezinkulu njengezikwele, ilensi eyodwa ayanele ukumboza lonke ulwazi. Ngokuvamile kuyadingeka ukusebenzisa inhlanganisela yamalensi. Isibonelo, ilensi engu-2.8mm ingasetshenziswa ukubuka i-panorama, kuyilapho ilensi engu-8mm ingasetshenziswa ukubuka imininingwane yephuzu eliqondile. Ilensi ye-varifocal ingakhethwa ukuze ilungise ubude be-focal ngendlela eguquguqukayo.
(6) Ukuqapha imigwaqo: Izindawo zokuhlangana kwemigwaqo njengemigwaqo emikhulu zidinga ukuqapha ibanga elide kakhulu ukuze zibone ngokucacile amapuleti elayisensi noma izinto ezikude ngamamitha angamakhulu. Izinhlelo zingafakelwa amalensi okuzikhethela anobude obuqondile obusukela ku-30mm kuya ku-120mm; uma zihlanganiswa namakhamera e-infrared thermal imaging, aqinisekisa ukuqapha okusebenzayo ngisho nasebusuku noma ngaphansi kwezimo zezulu ezimbi.
Ezimweni ezahlukene, ukugxila okugxilile nomaamalensi e-varifocalingakhethwa ngokwezidingo ezithile zokuqapha. Ngokuvamile, amalensi okugxila aqinile ayabizi futhi azinzile, okwenza afanelekele imigomo yokuqapha kanye nezimo lapho ibanga lizinzile; amalensi e-varifocal, ngakolunye uhlangothi, anobude obuguquguqukayo bokugxila, okwenza afanelekele izimo lapho ibanga lokuqapha noma ithagethi idinga ukulungiswa ngendlela eguquguqukayo.
Isikhathi sokuthunyelwe: Juni-02-2026
