Chroma Muenzaniso 4:4:4, 4:2:2 na4:2:0
Iwe wakamboona nhamba dze4:4:4, 4:2:2 uye 4:2:0 nezvimwe zvakasiyana-siyana, zviri nani ndizvo here?
Kuti unzwisise kukosha kwemazita aya, unofanirwa kuziva kuti nhamba idzi dzinorevei uye kuti dzinokanganisa sei vhidhiyo. Muchinyorwa chino tinogumira pa4:4:4, 4:2:2 na4:2:0. chroma subsampling algorithms.
Mune ino posvo isu tichafukidza:
Luma uye Chroma
Mufananidzo wedigital unogadzirwa ne pixels. Pixel imwe neimwe ine kupenya uye ruvara. Luma inomirira kujeka uye Chroma inomirira ruvara. Imwe neimwe pixel ine yayo Luminance kukosha.
Subsampling inoshandiswa muChrominance kushandisa huwandu hwe data mumufananidzo zvishoma.
Iwe unotora Chroma yepixel imwe kuti uverenge kukosha kwevavakidzani pixels. Giridhi inowanzoshandiswa kune iyi inotangira pa 4 reference points.
Ratio formula yeChroma subsampling
Iyo chroma subsampling inoratidzwa muchiyero chinotevera fomula: J:a:b.
J= nhamba yese yepixels muhupamhi hwereferensi yedu yebhuroko patani
a= nhamba yemasampuli echroma mumutsetse wekutanga (wepamusoro).
b= nhamba yemasampuli echroma mumutsara wechipiri (pazasi).
Ona mufananidzo uri pazasi we4:4:4 chroma subsampling
4:4:4
Mune iyi matrix, pixel yega yega ine yayo Chroma ruzivo. The codec haidi kufungidzira kuti kukosha kweChroma kunofanira kunge kuri kuitei nekuti yakanyorwa mune yega pixel.
Izvi zvinopa mufananidzo wakanakisa, asi wakachengeterwa makamera muchikamu chepamusoro-soro.
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4:2:2
Mutsara wekutanga unongowana hafu yeruzivo urwu uye unofanira kuverenga mamwe. Mutsara wechipiri unowanawo hafu uye unofanira kuverenga zvakasara.
Nekuti macodecs anogona kuita fungidziro yakanaka kwazvo, iwe uchaona chero mutsauko uine 4:4:4 mufananidzo. Muenzaniso wakakurumbira ndeye ProRes 422.
4:2:0
Mutsara wekutanga wemapikseli uchiri kuwana hafu yeChroma data, inokwana. Asi mutsara wechipiri hauna zvachose ruzivo rwayo, zvese zvinofanirwa kuverengerwa zvichibva pane zvakatenderedza pixels uye luminance ruzivo.
Chero bedzi paine misiyano mishoma uye mitsetse yakapinza mumufananidzo, iyi haisi dambudziko, asi kana iwe uchizogadzirisa mufananidzo mushure mekugadzirwa, unogona kusangana nematambudziko.
Kana ruzivo rweChroma rwanyangarika kubva pamufananidzo, haufe wakariwana zvakare. Pakugadzikwa kwemavara, mapixels anofanirwa "kufungidzira" zvakanyanya zvekuti mapixel anogadzirwa neChroma zvisizvo, kana kuvhara mapatani ane mavara akafanana asingaenderane nechokwadi.
Na Chroma kiyi zvinova zvakaoma kuchengeta mipendero yakasimba, rega kusvuta uye bvudzi, iyo data inoshaikwa kuziva mavara nemazvo.
A 4:4:4 grid haiwanzo kukosha, asi kana iwe uchida kugadzirisa mufananidzo gare gare, zvinobatsira kuve neruzivo rwakawanda rweChroma sezvinobvira.
Shanda neakanyanya subsampling kukosha kwenguva yakareba sezvinobvira, uye ingoshandura kune yakaderera subsampling kukosha isati yaburitswa yekupedzisira, semuenzaniso online.
Mhoroi, ndini Kim, amai uye munhu anofarira zvekumira-famba ane ruzivo mukugadzira midhiya nekuvandudzwa kwewebhu. Ndine chido chikuru chekudhirowa uye mifananidzo, uye ikozvino ndiri kunyura nemusoro munyika yekumira-kufamba. Neblog rangu, ndiri kugovera zvandinodzidza nemi varume.
