Iilensi zeCCTVngoku zisetyenziswa kakhulu, kodwa ukuze kuhambelane nemeko ethile, kufuneka kuqwalaselwe iiparameter ezininzi zobugcisa kunye neemfuno zokwenyani zesicelo, ezifana nokuchaza ngokucacileyo injongo yokubeka esweni, umgama wokubeka esweni, kunye nendawo yokubeka esweni.
Kweli nqaku, siza kujonga ngokweenkcukacha indlela yokukhetha iilensi zeCCTV ezifanelekileyo kwiimeko ezahlukeneyo.
Ukukhetha ilensi yeCCTV efanelekileyo kwimeko ethile kufuna ukuqwalaselwa ngokupheleleyo kwezi zinto zilandelayo:
1.Chaza iimfuno zemeko yokubeka esweni
Ngaphambi kokukhetha ilensi yeCCTV, kubalulekile—njengenyathelo elisisiseko—ukuqala ngokuchonga iimfuno ezithile zokubeka esweni kwimeko yesicelo ekujoliswe kuyo. Okokuqala, kuyimfuneko ukucacisa iimpawu zomntu oza kubeka esweni kunye nendawo.
Umzekelo, qinisekisa ukuba injongo kukujonga indawo enkulu okanye iinkcukacha ezincinci, nokuba umgama wokujonga mfutshane okanye mkhulu, nokuba imeko yokujonga ingaphakathi okanye ngaphandle, kunye nokuba zithini iimeko zokukhanya. Ekugqibeleni, ilensi efanelekileyo kufuneka ikhethwe ngokusekelwe kwezi mfuno zokujonga ezahlukeneyo.
2.Ukutshatisa iiparameter zelensi yesitshixo
Ubude befocal, i-aperture, i-field of view, kunye ne-resolution zonke ziiparameter zelensi ezibalulekileyo ekufuneka ziqwalaselwe:
(1) Ubude befocal. Ubude befocal yinto ebalulekileyo ekumiseleni zombini indawo yokujonga kunye nomgama wokujonga. Ubude obuhlukeneyo befocal buhambelana neemeko ezahlukeneyo zokujonga: okukhona ubude befocal bufutshane, kokukhona indawo yokujonga ibanzi; ngokuchaseneyo, okukhona ubude befocal bude, kokukhona umgama wokujonga umkhulu.
Umzekelo, ubude be-focal obuyi-2.8mm bufanelekile ukujonga umgama ngaphakathi kweemitha ezili-10 kunye nebala lokujonga elimalunga ne-100 degrees, nto leyo eyenza ukuba ifaneleke ukujonga iirejista zemali zangaphakathi, ii-elevator, kunye nezinye iindawo ngaphakathi koluhlu oluthile; ubude be-focal obuyi-8mm nangaphezulu bufanelekile ukujonga umgama ongaphezulu kweemitha ezili-15, nto leyo eyenza ukuba ifaneleke ukujonga umgama omde kwiindawo ezinkulu ezifana neendawo zokugcina impahla kunye neendawo zokupaka.
Ubude befocal yiparameter ebalulekileyo ekufuneka iqwalaselwe
(2) Imbobo. Imbobo imisela ubungakanani bokukhanya okungena kwikhamera, nto leyo echaphazela ngokuthe ngqo isiphumo somfanekiso ebusuku. Imbobo enkulu ivumela ukukhanya okungakumbi ukuba kungene, nto leyo ebangela imifanekiso ecacileyo kwiindawo ezinokukhanya okuphantsi kwaye iyenze ifaneleke kwiimeko zokujonga ebusuku ngaphandle kokukhanya okongezelelweyo. Imbobo encinci ifanelekile ngakumbi kwiindawo ezikhanyiswe kakuhle apho kufuneka ukucaca kwendawo ngokubanzi—njengakwimigca yemveliso okanye kwiindawo zokugcina izinto.
Kwiimeko zangaphandle okanye kwezinye iindawo apho ukukhanya kwe-ambient kutshintshatshintsha kakhulu, kuyacetyiswa ukuba ukhetheilensiixhotyiswe ngesici se-auto-iris, esinokuzilungisa ngokuzenzekelayo xa kutshintsha ukukhanya.
(3) Intsimi yoMbono. Intsimi yoMbono inxulumene kakhulu nobude obuphambili, kwaye imisela ngokuthe ngqo uluhlu olunokugutyungelwa yilensi. Ngokubanzi, iilensi ezinee-engile ezibanzi zinentsimi yoMbono engaphezulu kwama-90°, nto leyo eyenza zifaneleke ukujongwa okukhulu kwiindawo ezifana neendawo zokupaka iimoto kunye neendawo zikawonke-wonke; iilensi ze-telephoto zinentsimi yoMbono engaphantsi kwama-30° kwaye zilungele ukujongwa ngokweenkcukacha, umgama omde—umzekelo, kwizicelo ezibandakanya ukuqatshelwa kwepleyiti yelayisensi kunye nokuqatshelwa kobuso.
(4) Isisombululo. Okukhona isisombululo selensi siphezulu, kokukhona umfanekiso uya kucaca ngakumbi. Nangona kunjalo, isisombululo kufuneka sihambelane neemfuno zeenkcukacha zomntu ojongiweyo. Akusoloko kungcono ukuba nesisombululo esiphezulu.
Kwangaxeshanye, isisombululo selensi ngokwayo kufuneka sihambelane nesisombululo selensi. Iikhamera ezineembonakalo eziphezulu kufuneka zidibene neelensi ezineembonakalo ezifanayo, kungenjalo imiphetho yomfanekiso iya kuba luzizi; iilensi ezineembonakalo eziphezulu ezidibene neekhamera ezineembonakalo eziphantsi nazo zibangela ukulahleka kwesisombululo selensi.
Umzekelo, ilensi ye-2-megapixel ingahlangabezana neemfuno ezisisiseko zokubeka esweni, njengokubona imilo yabantu kunye nokuziphatha ngokubanzi, kwaye ifanelekile ekubekeni esweni ngokubanzi iipaseji eziqhelekileyo kunye neendawo zokugcina impahla.
(5) Ukuxhoma kunye neesensa. Ukuxhoma ilensi eqhelekileyo kuquka ii-M12, C, kunye nee-CS mounts. Ngaphambi kokufakwa, kubalulekile ukuqinisekisa ukuba i-lens mount ihambelana nojongano lwekhamera; ukungaphumeleli ukwenza njalo kunokubangela ukungakwazi ukuvelisa umfanekiso ocacileyo okanye kukhokelela ekonakaleni kwezixhobo.
Umgaqo ofanayo usebenza kubungakanani besenzi: isangqa somfanekiso welensi kufuneka sihambelane nobukhulu besenzi sekhamera; kungenjalo, umfanekiso usengozini enkulu yokudakumba, nto leyo eyenza kube nzima ukuthwebula umfanekiso ocacileyo.
Ukuthelekiswa kweparameter kwiilensi zeCCTV kubalulekile
3.Ukuphakama kofakelo kunye ne-engile
Ukuphakama kofakelo kunye ne-engile yeilensikwaye ikhamera ikwachaphazela iziphumo zokubeka esweni. Ngokubanzi, okukhona ikhamera iphakanyisiwe phezulu, kokukhona indawo yayo yokugubungela ethe tye inkulu. Xa uthatha umbono ojonge ezantsi ukusuka kwindawo ephezulu, kuyimfuneko ukwandisa ubude be-focal ngokufanelekileyo ukuze uphephe ukuchitha indawo phezulu kwisakhelo.
4.Izixhobo zokujonga ebusuku
Ukuba imeko yesicelo ifuna ukujongwa ebusuku, kuyafuneka nokuba kuqwalaselwe ilensi exhasa umbono wasebusuku we-infrared (IR) kwaye inomsebenzi wesihluzi esinqunyiweyo se-IR, ukuqinisekisa ukuba imifanekiso icacile yokujonga emini nasebusuku.
5.Ukuguquguquka kwendalo kunye nokuqina kwayo
Xa ukhetha iilensi zeCCTV, kubalulekile ukuqwalasela ukuguquguquka kwendalo kunye nokuqina kwayo—ingakumbi kwiilensi ezenzelwe ukusetyenziswa ngaphandle. Ingqwalasela ekhethekileyo kufuneka inikwe ekubeni ingaba zineempawu zokukhusela, ezinje ngothuli kunye nokumelana namanzi, ukuthintela ukungena kwamanzi emvula okunokubangela umonakalo kwilensi okanye ukungaphumeleli komfanekiso.
Ukukhethwa kweelensi zeCCTV kufuneka kuthathelwe ingqalelo ukuguquguquka kwendalo kunye nokuqina kwayo
6.Izicwangciso zokukhetha iimeko ezahlukeneyo zesicelo
(1) Ukujonga ngaphakathi endlwini: Yenzelwe ngokuyintloko ukugubungela amagumbi onke—njengegumbi lokuhlala—ukhetho olukhethwayo yi-wide-engileilensienobude obujolise ngqo obumalunga ne-4mm kunye nebala lokujonga elimalunga nama-70 degrees, nto leyo esusa isidingo sokulungiswa kwee-engile rhoqo.
(2) Ukungena kunye nokujonga indlela yokungena: Ngokuyintloko igxile ekujongeni iindlela ezimxinwa, olu lungiselelo lujolise ekubambeni ngokucacileyo intshukumo yabantu kunye nezinto kumgama ophakathi. Iilensi ezinobude obuphambili be-2.8mm okanye i-4mm ziyacetyiswa ukuqinisekisa ukugqunywa okude. Ukuphakama kokufakelwa kwe-2.5 ukuya kwi-3 yeemitha kuyacetyiswa ukuthintela i-engile esezantsi kakhulu, enokubangela ukuvaleka kobuso.
(3) Ukujonga umda wendawo yokupaka/indawo yokugcina impahla: Injongo ephambili kukubona ngokucacileyo iipleyiti zelayisensi okanye iimpawu zabasebenzi. Ungakhetha ilensi enobude obuyi-8mm okanye ngaphezulu ukuze ubone iipleyiti zelayisensi kunye neemodeli zezithuthi kumgama weemitha ezili-15-30 kwaye ubone ngokucacileyo ubuso. Xa ufaka ngaphandle, qiniseka ukuba unika ingqalelo kumlinganiselo welensi ongangeni manzi nongangeni luthuli.
(4) Ukujonga ukuphuma evenkileni/eofisini: Indawo ivaliwe, kwaye kuyimfuneko ukulinganisela umbono kunye neenkcukacha. Ingqwalasela ephambili ikummandla wonke kunye neenkcukacha. Iilensi ze-4mm okanye ze-6mm zingakhethwa. Ukuba kuyimfuneko ukurekhoda ngokucacileyo iinkqubo zokuthengiselana okanye iimpawu zobuso, kucetyiswa ilensi ye-6mm.
Kukho iindlela ezahlukeneyo zeemeko ezahlukeneyo zesicelo
(5)Ukujonga indawo evulekileyo enkulu: Kwiindawo ezinkulu ezifana nezikwere, ilensi enye ayanelanga ukugubungela lonke ulwazi. Kudla ngokuba yimfuneko ukusebenzisa indibaniselwano yeelensi. Umzekelo, ilensi ye-2.8mm ingasetyenziselwa ukujonga i-panorama, ngelixa ilensi ye-8mm ingasetyenziselwa ukujonga iinkcukacha zenqaku elimiselweyo. Ilensi ye-varifocal ingakhethwa ukuze ilungelelanise ubude be-focal ngokuguquguquka.
(6) Ukujonga iindlela ezinqumlanayo: Iindawo ezinqumlanayo ezifana neendlela zifuna ukujonga umgama omde kakhulu ukuze zibone ngokucacileyo iipleyiti zelayisensi okanye izinto ezikude kumakhulu eemitha. Iinkqubo zinokuxhotyiswa ngeelensi ezikhethiweyo ezinobude obuphakathi ukusuka kwi-30mm ukuya kwi-120mm; xa zidibene neekhamera ze-infrared thermal imaging, ziqinisekisa ukujonga okusebenzayo nokuba kusebusuku okanye phantsi kweemeko zemozulu ezimbi.
Kwiimeko ezahlukeneyo, ingqwalasela esisigxina okanyeiilensi ze-varifocalzingakhethwa ngokweemfuno ezithile zokubeka esweni. Ngokubanzi, iilensi ezigxile kwi-fixed focus azibizi kakhulu kwaye zizinzile, nto leyo ezenza zifaneleke kwiithagethi zokubeka esweni kunye neemeko apho umgama umi khona; iilensi ze-varifocal, kwelinye icala, zinobude obuhlengahlengiswayo be-focal, nto leyo ezenza zifaneleke kwiimeko apho umgama wokubeka esweni okanye ithagethi kufuneka ilungiswe ngokulula.
Ixesha lokuthumela: Juni-02-2026
