Chroma Subsampling 4:4:4, 4:2:2 da 4:2:0
Wataƙila kun ga lambobin 4:4:4, 4:2:2 da 4:2:0 da sauran bambance-bambancen, mafi girma ya fi kyau ko?
Don fahimtar mahimmancin waɗannan zayyana, kuna buƙatar sanin abin da waɗannan lambobin ke nufi da kuma yadda suke shafar bidiyo. A cikin wannan labarin mun iyakance kanmu ga 4:4:4, 4:2:2 da 4:2:0 chroma subsampling algorithms.
A cikin wannan sakon za mu rufe:
Luma da Chroma
Hoton dijital ya ƙunshi pixels. Kowane pixel yana da haske da launi. Luma yana nufin tsabta kuma Chroma yana nufin launi. Kowane pixel yana da nasa ƙimar Luminance.
Ana amfani da ƙima a cikin Chrominance don amfani da adadin bayanai a cikin hoto kaɗan.
Kuna ɗaukar Chroma na pixel ɗaya don ƙididdige ƙimar pixels maƙwabta. Yawancin lokaci ana amfani da grid don wannan wanda ke farawa a wuraren tunani guda 4.
Tsarin rabo na Chroma subsampling
Ana nuna samfurin chroma a cikin dabarar rabo mai zuwa: J: a: b.
J= jimlar adadin pixels a cikin faɗin tsarin toshewar tunani
a= adadin samfuran chroma a jere na farko (saman).
b= adadin samfuran chroma a jere na biyu (kasa).
Dubi hoton da ke ƙasa don samfurin chroma 4:4:4
4:4:4
A cikin wannan matrix, kowane pixel yana da nasa bayanin Chroma. The Codec baya buƙatar kimanta abin da ya kamata darajar Chroma ta kasance saboda ana yin rikodin ta a cikin kowane pixel guda.
Wannan yana ba da mafi kyawun hoto, amma an tanada shi don kyamarori a cikin mafi girman sashi.
Farawa da naku allunan labarin motsi na tsayawa
Biyan kuɗi zuwa wasiƙarmu kuma sami zazzagewarku kyauta tare da allunan labarai uku. Fara da kawo labaran ku da rai!
Za mu yi amfani da adireshin imel ɗin ku kawai don wasiƙun labarai kuma mu girmama ku tsare sirri
4:2:2
Layi na farko kawai yana samun rabin wannan bayanin kuma dole ne ya lissafta sauran. Layi na biyu kuma yana samun rabi kuma dole ya lissafta sauran.
Saboda codecs na iya yin ƙididdiga masu kyau sosai, ba za ku ga kusan babu bambanci tare da hoton 4:4:4 ba. Shahararren misali shine ProRes 422.
4:2:0
Layin farko na pixels har yanzu yana samun rabin bayanan Chroma, wanda ya isa. Amma jeri na biyu kwata-kwata ba shi da wani bayani na kansa, dole ne a lissafta komai bisa la'akari da kewayen pixels da bayanan haske.
Muddin akwai ɗan bambanci da layukan kaifi a cikin hoton, wannan ba matsala ba ne, amma idan za ku gyara hoton a bayan samarwa, kuna iya fuskantar matsaloli.
Idan bayanin Chroma ya ɓace daga hoton, ba za ku taɓa dawowa ba. A cikin ƙididdige launi, pixels dole ne su "kimanta" ta yadda za a ƙirƙiri pixels tare da ƙimar Chroma ba daidai ba, ko kuma toshe alamu masu kama da launi waɗanda basu dace da gaskiya ba.
Tare da Maɓallin Chroma yana da wahala sosai don kiyaye gefuna, balle hayaki da gashi, bayanan sun ɓace don gane launuka daidai.
Grid na 4:4:4 ba koyaushe yake da mahimmanci ba, amma idan kuna son gyara hoton daga baya, yana taimakawa samun bayanan Chroma gwargwadon iko.
Yi aiki tare da mafi girman ƙimar ƙima na tsawon lokacin da zai yiwu, kuma kawai jujjuya zuwa ƙaramin ƙima kafin fitowar ƙarshe, misali akan layi.
Barka dai, Ni Kim, mahaifiya ce kuma mai sha'awar tsayawa motsi tare da kwarewa a ƙirƙirar kafofin watsa labarai da haɓaka yanar gizo. Ina da sha'awar zane da raye-raye, kuma yanzu na fara nutsewa a cikin duniyar tasha-motsi. Tare da bulogi na, Ina raba abubuwan da na koya tare da ku mutane.
