22/04/29I-Photo-response Non-uniformity (PRNU) yimbonakaliso yokufana kwempendulo yekhamera ekukhanyeni, okubalulekileyo kwezinye izicelo zokukhanya okuphezulu.
Xa ukukhanya kubhaqwe yikhamera, inani leelektroni zefoto ezifakwe ngepixel nganye ngexesha lokuvezwa liyalinganiswa, kwaye lixelwe kwikhompyuter njengexabiso ledijithali legreyscale (ADU). Olu tshintsho lusuka kwii-electron ukuya kwii-ADU lulandela umlinganiselo othile we-ADU nge-electron ebizwa ngokuba yinzuzo yokuguqulwa, kunye nexabiso elimiselweyo (eliqhelekileyo li-100 ADU). La maxabiso amiselwa yi-Analogue-to-digital converter kunye ne-Aplifier esetyenziselwa ukuguqulwa. Iikhamera ze-CMOS zifumana isantya esimangalisayo kunye neempawu zengxolo ephantsi ngokusebenza ngokuhambelanayo, kunye nesiguquli se-analogue ukuya kwidijithali kwikholamu nganye yekhamera, kunye ne-amplifier enye ngepikseli nganye. Oku kukwazisa ithuba lokwahluka okuncinci kwinzuzo kunye nokunciphisa ukusuka kwipixel ukuya kwipikseli.
Ukwahluka kweli xabiso lokulinganisa kunokukhokelela kwingxolo yepateni esisigxina ekukhanyeni okuphantsi, okumelwe yiI-DSNU. I-PRNU imele naluphi na utshintsho kwinzuzo, umlinganiselo wee-electron ezichongiweyo kwi-ADU ebonisiweyo. Imele ukutenxa okusemgangathweni kwamaxabiso okuzuza kweepixels. Ngenxa yokuba umahluko obangelwa kumaxabiso obunzima uya kuxhomekeka kubungakanani bemiqondiso, imelwe njengepesenti.
Amaxabiso aqhelekileyo ePRNU <1%. Kuyo yonke imifanekiso ephantsi kunye nephakathi, eneempawu ze-1000e- okanye ngaphantsi, olu tshintsho luya kuba lungabalulekanga xa luthelekiswa nokufunda ingxolo kunye neminye imithombo yengxolo.
Kwakhona xa ubonisa amanqanaba okukhanya aphezulu, ukuhluka akunakwenzeka ukuba kubaluleke kakhulu xa kuthelekiswa neminye imithombo yengxolo emfanekisweni, njengengxolo yefoton. Kodwa kwiinkqubo zokucinga ezikumgangatho ophezulu ezifuna ukuchaneka komlinganiselo ophezulu kakhulu, ngakumbi ezo zisebenzisa isakhelo-avareji okanye isakhelo-sishwankathelo, iPRNU ephantsi inokuba luncedo.
