Iyiphi i-ADC yekhamera yeDis Digital?

Kutheni Ufanele Unakekele nge-ADC yakho Ikhamera

I-ADC imele i-Analog kuya kwi-Digital Converter kwaye ibhekisela kwikhamera yedijithali yokubamba ngokoqobo kwaye uyiguqule kwifayile yedijithali. Inkqubo ithatha yonke imibala, ukungafani, kunye nolwazi lwetoni lomdlalo kwaye luyibuyisela kwidijithali ngokusebenzisa ikhowudi yebhanari eyisiseko yezobuchwepheshe bekhompyutha.

Zonke iikhamera zedijithali zinikezelwe ngenombolo ye-ADC kwaye zinikezelwa kwiinkcukacha zobugcisa bomenzi ngamnye kumzekelo. Kubalulekile ukuqonda ukuba yi-ADC ngokwenene, njani isebenza ngayo, kwaye kutheni kungadlala indima ekuthengeni kwakho kwekhamera.

Yintoni i-ADC?

Zonke i- DSLR kunye nephuzu kunye nokudubula iikhamera zineenzwa eziqulethwe ngamaphikseli nge-photodiode . Ezi ziguqula amandla e-photons zibe yintlawulo kagesi. Le ntlawulo iguqulwa kwi-voltage, leyo iphinda ikhuliswe kwizinga apho ingaqhutyelwa khona yinkhamera ye-digital ye-Analog kuya kwi-Digital Converter (ebizwa ngokuba yi-ADC, i-AD Converter kunye ne-A / D Converter esifutshane).

I-ADC iyi-chip phakathi kwekhamera yakho yedijithali kunye nomsebenzi wayo ukuhlukanisa imilinganiselo yamaphikseli kumanqanaba okukhanya kunye nokwabela nganye inqanaba kwinani lebhanki, eliqukethe ii-zero kunye nazo. Uninzi lweekhamera zedijithali zedijithali zisebenzisa ubuncinane i-AD-8-bit ADC, evumela ukufikelela kumaxabiso angama-256 ukukhanya kwepikelli enye.

Ukuqulunqa i-ADC ye-Digital Camera

Umlinganiselo omncinci wancinci we-ADC uzimisele ngoluhlu oluchanekileyo (ukuchaneka) kweso senzwa . Uluhlu olukhulu olunamandla luya kufuna ubuncinane i-AD-10 ye-ADC ukuvelisa inani elikhulu leetoni kunye nokukhusela nayiphi na ilahleko yolwazi.

Nangona kunjalo, abenzi bekhamera badla ngokugqithiseleyo ukucacisa i-ADC (njenge-12 bits endaweni ye-10 bits) ukuze uvumeleke naziphi na iimpazamo kuyo. Eminye "bits" inokukunceda ukunqanda ukuxhonywa (posterization) xa usebenzisa iifowuni zomnatha kwiedatha. Nangona kunjalo, abayi kuvelisa nayiphi na ingcaciso engaphezulu yeetoni, ngaphandle kwengxolo.

Kuthetha ukuthini oku kuthetha ukuthenga ikhamera entsha?

Sithe satshilo ukuba abaninzi beekhamera zedijithali zedijithali ze-ADC eziyi-8 kwaye oku kunelungelo kubadlali abafakela imifanekiso yentsapho okanye babamba ukushona kwelanga elihle. I-ADC idlala indima enkulu kwiikhamera ze-DSLR eziphezulu-ekupheleni kwamanqanaba olwazi kunye nabafundi bamatriki.

Uninzi lwe-DSLR lukwazi ukubamba kunye ne-ADC ephezulu efana ne-10-bit, 12-bit, ne-14-bit. Ezi zi-ADC eziphakamileyo zenzelwe ukwandisa ixabiso leetaliti ezinokuthi zithinte ikhamera, zenze izithunzi ezijulile kunye namadididi alula.

Umehluko phakathi komfanekiso we-12-bit kunye no-14-bit uyakuba mncinci kwaye ungabonakali ninzi kwiifoto. Kwakhona, konke kuya kuxhomekeka kuluhlu oluchanekileyo lwenzwa yakho. Ukuba uluhlu olushukumisayo alukhulanga nge-ADC, ngoko alukwazi ukuphumelela ekuphuculeni umgangatho womfanekiso.

Njengoko iteknoloji yedijithali iyaqhubeka nokuphucula, ngokunjalo kuya kufumaneka umlinganiselo osebenzayo wekontraji kunye nekhamera yokukwazi ukuyifamba.

Kufuneka kwakhona kuqaphele ukuba kwiinkhamera ezininzi ze-DSLR, ukukwazi ukuthatha imifanekiso kusetyenziswa nayiphi na i-ADC ngaphezulu kwe-8-bits iya kufuna ukudubula kwifom ye-RAW. I-JPG kuphela ivumela isiteshi se-8-bit yedatha.