Nigute wamenya niba lensi ifite ireme ryiza ryo gufata amashusho?

Kugira ngo harebwe niba ubwiza bw'ifoto yalenzi y'amasoni byiza, hari ibipimo bimwe na bimwe byo gupima bikenewe, nko gupima uburebure bw'ikirahuri, aho umuntu abona ibintu, ubushobozi bwo kureba, nibindi. Ibi byose ni ibipimo bisanzwe. Hariho kandi ibipimo bimwe na bimwe by'ingenzi, nka MTF, guhindagurika, nibindi.

1.MTF

MTF, cyangwa imikorere yo kohereza amashusho mu buryo bw'ikoranabuhanga, ishobora gupima ibice by'ishusho, nk'ibisobanuro birambuye, itandukaniro, n'ubusobanuro busobanutse. Ni kimwe mu bipimo byo gusuzuma neza ubwiza bw'ishusho ya lens.

Muri MTF two-dimensional coordinate curve, umurambararo wa Y ubusanzwe ni agaciro (0 ~ 1), naho umurambararo wa X ni umurambararo w’ahantu (lp / mm), ni ukuvuga umubare wa "line pairs". Frequency nke ikoreshwa mu gusuzuma itandukaniro ry'ishusho nyuma yo gufata amashusho, naho frequence nini ikoreshwa mu gusuzuma ubushishozi n'ubushobozi bw'ikirahure, ni ukuvuga ubushobozi bwo gutandukanya utuntu duto.

Urugero, ku mboni z'amafoto, 10lp/mm ikoreshwa mu gusuzuma ingaruka zo gutandukanya, kandi agaciro ka MTF muri rusange kari hejuru ya 0.7 kugira ngo kabe ari keza; frequency yo hejuru isuzuma 30lp/mm, akenshi irenga 0.5 mu gice cy'ishusho, kandi irenga 0.3 ku nkengero z'ishusho.

Gupima MTF

Ku bikoresho bimwe na bimwe by'ikoranabuhanga cyangwaamatara yo mu nganda, bafite ibisabwa byinshi ku nshuro nyinshi, none se twabara dute frequency nyinshi dushaka gusuzuma? Mu by'ukuri, biroroshye cyane: frequency = 1000/(2×ingano ya pikseli ya sensor)

Niba ingano ya pikseli ya sensor ukoresha ari 5um, noneho frequency yo hejuru ya MTF igomba gusuzumwa kuri 100lp/mm. Iyo agaciro ka MTF kapimwe kari hejuru ya 0.3, ni lenzi nziza cyane.

2.Kugoreka

MTF ntishobora kugaragaza ihindagurika ry’ihindagurika, bityo ihindagurika ryitondekwa ukwaryo. Ihindagurika, cyangwa ihinduka, rishobora kugabanywamo ihindagurika rya pincushion na ihindagurika rya barrel.

Kugoreka bifitanye isano n'aho umuntu areba. Uko umuntu areba ari munini, ni ko kugoreka kuba gukomeye. Ku njyana zisanzwe za kamera n'injana zo kugenzura, kugoreka biri hagati ya 3% ni byo byemewe; ku njana zifite inguni nini, kugoreka bishobora kuba hagati ya 10% na 20%; ku njana z'amaso ya fisheye, kugoreka bishobora kuba hagati ya 50% na 100%.

Ingaruka zo kugoreka kwa lensi y'amaso ya fisheye

None se, ni gute wamenya ingano y'ihindagurika ry'indorerwamo z'amabara wifuza kugenzura?

Ubwa mbere, ugomba kumenya icyolentileikoreshwa. Urugero, niba ikoreshwa mu gufotora cyangwa gukurikirana, ihinduka ry'indorerwamo muri 3% byemewe. Ariko niba ikoreshwa mu gupima, ihinduka rigomba kuba riri munsi ya 1% cyangwa rito. Birumvikana ko ibi biterwa n'ikosa rya sisitemu ryemerwa na sisitemu yawe yo gupima.

Ibitekerezo bya nyuma:

Mu gukorana n'inzobere muri ChuangAn, haba mu gushushanya no gukora ibintu bikorwa n'abahanga mu by'ubuhanga. Mu rwego rwo kugura, uhagarariye ikigo ashobora gusobanura mu buryo burambuye amakuru yihariye yerekeye ubwoko bwa lens wifuza kugura. Uruhererekane rw'ibicuruzwa bya lens bya ChuangAn bikoreshwa mu buryo butandukanye, kuva ku kugenzura, gupima, indege zitagira abapilote, imodoka kugeza ku mazu agezweho, n'ibindi. ChuangAn ifite ubwoko butandukanye bwa lens zarangiye, zishobora no guhindurwa cyangwa guhindurwa bitewe n'ibyo ukeneye. Twandikire vuba bishoboka.