JP2017201812A - 符号化方法及び復号化方法、並びにそれを利用する装置 - Google Patents
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Abstract
【解決手段】符号化方法は、現在ブロックに対する画面内予測モードを特定するステップ、及び現在ブロックの画面内予測による残余信号をスキャニングするステップを含み、残余信号をスキャニングするステップでは、現在ブロックの輝度サンプルに対する画面内予測モードによって現在ブロックの輝度信号及び色差信号に対するスキャニングタイプを決定する。
【選択図】図12
Description
PredModeは、現在ブロックに対する符号化モードを意味し、画面内符号化の場合‘Intra’であり、画面間符号化の場合‘Inter’である。
Claims (4)
- ビデオ信号から現在ブロックに関連する予測モードを取得するステップと、
前記画面内予測モードに基づいて、前記現在ブロックに画面内予測を行うことによって、前記現在ブロックの予測サンプルを取得するステップと、
前記現在ブロックのスキャニングタイプに基づいて、前記現在ブロックの変換係数をスキャニングするステップと、前記現在ブロックの前記スキャニングタイプは、前記現在ブロックの画面内予測モードの方向に基づいて決定される、ステップと、
前記変換係数を逆量子化することによって、前記現在ブロックの逆量子化された変換係数を取得するステップと、
前記逆量子化された変換係数に逆変換を行うことによって、前記現在ブロックの残余サンプルを取得するステップと、前記逆変換は、水平方向及び垂直方向に行われる、ステップと、
前記逆変換は、整数離散余弦変換(DCT)及び整数離散正弦変換(DST)の一つを用いることにより実行され、
前記現在ブロックのサイズは、4×4であり、前記DSTは、前記画面内予測モードの前記方向にかかわらず、前記水平方向と前記垂直方向の両方に適用され、
前記残余サンプルと前記予測サンプルとを用いて、前記現在ブロックを再構成するステップと、
を備えることを特徴とするビデオ復号化方法。 - 前記現在ブロックの前記画面内予測モードが6から14の範囲であるとき、前記スキャニングタイプは、垂直方向のスキャニングタイプに決定されることを特徴とする請求項1に記載のビデオ復号化方法。
- 前記現在ブロックの前記画面内予測モードが22から30の範囲であるとき、前記スキャニングタイプは、水平方向のスキャニングタイプに決定されることを特徴とする請求項1に記載のビデオ復号化方法。
- 前記現在ブロックの前記画面内予測モードが6から14、及び22から30以外の範囲であるとき、前記スキャニングタイプは、斜め(diagonal)方向のスキャニングタイプに決定されることを含むことを特徴とする請求項1に記載のビデオ復号化方法。
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