Funso ili ndi lomveka koma lopanda yankho losavuta. Pali zinthu zambiri zomwe zingakhudze zotsatira zake, monga kuchepa kwa nyengo zosiyanasiyana, kukhudzidwa kwa chowunikira kutentha, njira yojambulira zithunzi, phokoso la dead-point ndi back ground, komanso kusiyana kwa kutentha kwa background. Mwachitsanzo, chipolopolo cha ndudu chimaoneka bwino kuposa masamba pamtengo womwewo ngakhale chitakhala chaching'ono kwambiri, chifukwa cha kusiyana kwa kutentha kwa background.
Mtunda wozindikira ndi zotsatira za kuphatikiza zinthu zomwe munthu amadziona yekha komanso zinthu zomwe munthuyo akufuna. Umagwirizana ndi maganizo a munthu amene amaona, zomwe wakumana nazo komanso zinthu zina. Kuti tiyankhe funso lakuti “kamera yotenthetsera imatha kuona mpaka pati,” tiyenera kudziwa tanthauzo lake poyamba. Mwachitsanzo, kuti tizindikire cholinga, pamene A akuganiza kuti akhoza kuchiwona bwino, B sangachiwone. Chifukwa chake, payenera kukhala muyezo wowunikira womwe umagwirizana komanso wogwirizana.
Zofunikira za Johnson
Johnson anayerekeza vuto la kuzindikira maso ndi mizere iwiri malinga ndi kuyesera. Mizere iwiri ndi mtunda womwe umadutsa pakati pa kuwala kofanana ndi mizere yakuda pamalire a kuwona kwa wowonera. Mizere iwiri ndi yofanana ndi ma pixel awiri. Kafukufuku wambiri wasonyeza kuti n'zotheka kudziwa mphamvu yozindikira cholinga cha infrared thermal imager system pogwiritsa ntchito mizere iwiri popanda kuganizira mtundu wa zolakwika za cholinga ndi chithunzi.
Chithunzi cha cholinga chilichonse mu focal plane chimakhala ndi ma pixel angapo, omwe amatha kuwerengedwa kuchokera ku kukula, mtunda pakati pa cholinga ndi chithunzi cha kutentha, ndi malo owonera mwachangu (IFOV). Chiŵerengero cha kukula kwa cholinga (d) ndi mtunda (L) chimatchedwa aperture angle. Chingagawidwe ndi IFOV kuti mupeze chiwerengero cha ma pixel omwe ali ndi chithunzicho, ndiko kuti, n = (D / L) / IFOV = (DF) / (LD). Zitha kuoneka kuti kutalika kwa focal kukakhala kwakukulu, mfundo zazikulu zomwe zili ndi chithunzicho. Malinga ndi Johnson criterion, mtunda wozindikira ndi wautali. Kumbali inayi, kutalika kwa focal kukakhala kwakukulu, ngodya ya munda ikakhala yaying'ono, ndipo mtengo wake ungakhale wokwera.
Tikhoza kuwerengera kutalika komwe chithunzi cha kutentha china chake chingawone kutengera ma resolutions ochepera malinga ndi zomwe Johnson's Criteria akunena:
Kuzindikira - chinthu chilipo: 2 +1/-0.5 pixels
Kuzindikira - mtundu wa chinthu ukhoza kuwonedwa, munthu poyerekeza ndi galimoto: 8 +1.6/-0.4 pixels
Kuzindikiritsa - chinthu china chake chingathe kudziwika, mkazi poyerekeza ndi mwamuna, galimoto yeniyeni: 12.8 +3.2/-2.8 pixels
Miyeso iyi imapereka mwayi wa 50% kuti wowonera asankhe chinthu pamlingo womwe watchulidwa.
Nthawi yotumizira: Novembala-23-2021