Kaloku, lo ngumbuzo ofanelekileyo kodwa ongenampendulo ilula. Zininzi izinto ezinokuchaphazela iziphumo, ezinje ngokuncipha kwemozulu kwiimeko ezahlukeneyo, uvakalelo lwe-thermal detector, i-algorithm yemifanekiso, iingxolo ze-dead-point kunye ne-back ground, kunye nomahluko wobushushu obuvela kumqolo ekujoliswe kuwo. Umzekelo, i-cigarette butt ibonakala ngokucacileyo kunamagqabi emthini akumgama ofanayo nokuba incinci kakhulu, ngenxa yomahluko wobushushu obuvela kumqolo ekujoliswe kuwo.
Umgama wokufumanisa ngumphumo wokudibana kwezinto ezizimeleyo kunye nezinto ezijolise ngqo. Unxulumene nesayikholoji yokubona yomjongi, amava kunye nezinye izinto. Ukuze siphendule "ingaba ikhamera yobushushu ibona kude kangakanani", kufuneka sifumane kuqala ukuba kuthetha ukuthini. Umzekelo, ukuze sifumane ithagethi, ngelixa u-A ecinga ukuba unokuyibona ngokucacileyo, u-B usenokungayiboni. Ke ngoko, kufuneka kubekho umgangatho wovavanyo olujolise ngqo noludibeneyo.
Iikhrayitheriya zikaJohnson
UJohnson uthelekise ingxaki yokubona iliso neentambo zomgca ngokwesilingo. Intambo yomgca ngumgama ongaphantsi kokukhanya okulinganayo kunye nemigca emnyama kumda wokubona komjongi. Intambo yomgca ilingana neepikseli ezimbini. Izifundo ezininzi zibonise ukuba kunokwenzeka ukumisela amandla okubona ithagethi yenkqubo ye-infrared thermal imager ngokusebenzisa iintambo zomgca ngaphandle kokuqwalasela uhlobo lwethagethi kunye neziphene zomfanekiso.
Umfanekiso wethagethi nganye kwi-focal plane uthatha ii-pixels ezimbalwa, ezinokubalwa ukusuka kubukhulu, umgama phakathi kwethagethi kunye ne-thermal imager, kunye ne-instantaneous field of view (IFOV). Umlinganiselo wobungakanani bethagethi (d) kumgama (L) ubizwa ngokuba yi-aperture angle. Unokwahlulwahlulwa yi-IFOV ukuze ufumane inani lee-pixels ezihlala ngumfanekiso, oko kukuthi, n = (D / L) / IFOV = (DF) / (LD). Kuyabonakala ukuba ubude be-focal bukhulu, kokukhona amanqaku aphezulu ahlala ngumfanekiso wethagethi. Ngokwe-criterion kaJohnson, umgama wokufumanisa ude kakhulu. Kwelinye icala, ubude be-focal bukhulu, i-engile yentsimi incinci, kwaye ixabiso liya kuba phezulu.
Singabala ukuba umfanekiso othile wobushushu unokubonwa kude kangakanani ngokusekwe kwizisombululo eziphantsi ngokweekhrayitheriya zikaJohnson zezi:
Ukufunyanwa – into ikhona: 2 +1/-0.5 pixels
Ukuqatshelwa – uhlobo lwento lunokubonwa, umntu xa kuthelekiswa nemoto: 8 +1.6/-0.4 pixels
Ukuchongwa – into ethile inokubonwa, umfazi xa kuthelekiswa nendoda, imoto ethile: 12.8 +3.2/-2.8 pixels
Ezi zilinganiso zinika amathuba angama-50% okuba umjongi ahlule into kwinqanaba elichaziweyo.
Ixesha lokuthumela: Novemba-23-2021