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CBR (Constant Bit Rate) kode ak yon to bit konstan. Lè Mouvman rive, paske to a ti jan se konstan, gwosè a codeword ka sèlman redwi a lè yo ogmante QP a, ak bon jan kalite a imaj vin pi mal. Lè sèn nan se toujou, bon jan kalite a imaj se ankò vin pi bon, se konsa bon jan kalite a imaj se enstab. Algoritm sa a bay priyorite nan pousantaj ti jan (Pleasant).
Sa a algorithm ka konsidere kòm algorithm ki pi difisil pou kontwòl pousantaj, paske li enposib detèmine lè mouvman ap fèt. Si mouvman rive nan dènye ankadreman fenèt estatistik pousantaj yo, gwosè ankadreman an ap vin pi gwo, sa ki lakòz to estatistik la. Li pi plis pase pousantaj kòd prereglaj la, ki vle di ke li pa rezonab pou konte pousantaj kòd la yon fwa pa segonn. Li ta dwe pousantaj la kòd mwayèn sou yon peryòd de tan, ki se pi rezonab.
VBR (To Varyab Bit) dinamik pousantaj ti jan, pousantaj ti jan li yo ka chanje ak konpleksite nan imaj la, se konsa efikasite kod li yo relativman wo, lè Mouvman rive, gen kèk mozayik. Algoritm kontwòl pousantaj ti jan an detèmine pousantaj ti jan yo itilize selon kontni imaj la. Si kontni imaj la pi senp, li pral asiyen mwens débit (li sanble ke mo a pi apwopriye). Si kontni an imaj se konplèks, li pral asiyen plis codewords. Sa a pa sèlman garanti bon jan kalite a, men tou, pran an kont restriksyon Pleasant. Sa a algorithm priyorite bon jan kalite imaj.
CVBR (Contrainte VariableBit To), li ta gòch tradwi li nan Chinwa. Li se yon metòd amelyore nan VBR. Men, kote se contrainte? BitRate Maksimòm ki koresponn ak algorithm sa a konstan oswa BitRate Mwayèn lan konstan. Metòd sa a pran an kont avantaj ki genyen nan de metòd ki anwo yo: lè kontni an imaj se estatik, se Pleasant sove, ak lè Mouvman rive, se Pleasant a sove nan peryòd anvan an itilize amelyore bon jan kalite a imaj otank posib, konsa tankou reyalize objektif la nan pran an kont tou de Pleasant ak bon jan kalite imaj. Metòd sa a anjeneral pèmèt itilizatè a antre nan pousantaj la kòd maksimòm ak pousantaj la kòd minimòm. Lè li estasyonè, pousantaj kòd la estab nan pousantaj kòd minimòm lan. Lè an mouvman, pousantaj kòd la pi gran pase pousantaj kòd minimòm lan, men li pa depase pousantaj kòd maksimòm lan. Modèl ideyal la se jan sa a:
ABR (Mwayèn Bit To) rive nan to a ti jan mete nan yon seri tan sèten, men valè a bit lokal to pik ka depase to a bit mete, ak to a bit mwayèn se konstan.
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