22/04/29Iyo Photo-response Non-uniformity (PRNU) inomiririra kufanana kwemhinduro yekamera kuchiedza, yakakosha mune mamwe maapplication ane-high-light.
Kana chiedza chikaonekwa nekamera, huwandu hwemaphoto-electrons anotorwa nepixel yega yega panguva yekuratidzwa hunoyerwa, uye hunoziviswa kukombiyuta se digital greyscale value (ADU). Kutendeuka uku kubva kumaerekitironi kuenda kuADU kunotevera imwe chiyero cheADU paerekitironi inonzi the conversion gain, pamwe nefixed offset value (kazhinji zana ADU). Aya makosi anotemerwa neAnalogue-ku-digital converter uye Amplifier inoshandiswa pakushandura. Makamera eCMOS anowana kumhanya kunoshamisa uye kuderera kweruzha hunhu kuburikidza nekushanda pamwe chete, neimwe kana anopfuura analogue-kune-dhijitari inoshandura pakoramu yekamera, uye imwe amplifier papixel. Izvi zvakadaro zvinounza mukana wekusiyanisa kudiki mukuwana uye kugadzirisa kubva pixel kusvika pixel.
Misiyano mune iyi yekubvisa kukosha inogona kutungamira kune yakagadziriswa patani ruzha pane yakaderera mwenje, inomiririrwa neDSNU. Iyo PRNU inomiririra chero misiyano mukuwana, chiyero chemaerekitironi akaonekwa kune anoratidzwa ADU. Inomiririra kutsauka kwakajairwa kwekuwana kukosha kwemapikseli. Tichifunga kuti mutsauko unoguma mukusimba kwehutsika huchaenderana nehukuru hwezviratidzo, inomiririrwa sechikamu.
Yakajairika PRNU tsika ndeye <1%. Kune ese akadzika- uye epakati-mwenje ekufungidzira, ane masaini e1000e- kana mashoma, musiyano uyu uchave usingakoshi kana uchienzaniswa nekuverenga ruzha uye mamwe manyuko eruzha.
Zvakare kana uchifungidzira mazinga emwenje akakwira, kusiyanisa hakufanirwe kuve kwakakosha kana uchienzaniswa nemamwe masosi eruzha mumufananidzo, senge photon shot ruzha. Asi mune yakakwirira-mwenje yekufungidzira maapplication inoda yakanyanya kuyera kuyerwa, kunyanya ayo anoshandisa furemu-avhareji kana furemu-summing, yakaderera PRNU inogona kubatsira.
