JP2017041902A - 動画符号化装置 - Google Patents
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Abstract
【解決手段】インター予測符号化方法は、現在予測ユニットの動きベクトル及び参照ピクチャーインデックスを定め、現在予測ユニットと隣接している既定の位置の予測ユニットの有効な動きベクトルを空間動きベクトル候補者に誘導し、以前に符号化された参照ピクチャー内の現在予測ユニットに対応する位置を、現在予測ユニットの有効な時間動きベクトル候補者に誘導し、有効な空間及び時間動きベクトル候補者の何れかを現在予測ユニットの動きベクトル予測子と定め、その動きベクトル予測子との動きベクトル差値を求め、差値と参照ピクチャーインデックスとを符号化する。
【選択図】図1
Description
(付記1)
インター予測符号化方法において、
現在予測ユニットの動きベクトル及び参照ピクチャーインデックスを定める段階と、
前記現在予測ユニットと隣接している既定の位置の予測ユニットの有効な動きベクトルを空間動きベクトル候補者に誘導する段階と、
前記現在予測ユニットの有効な時間動きベクトル候補者を誘導する段階と、
前記有効な空間動きベクトル候補者及び時間動きベクトル候補者のうち一つを、現在予測ユニットの動きベクトル予測子と定める段階と、
前記現在予測ユニットの動きベクトルと前記定められた動きベクトル予測子との動きベクトル差値を求め、前記差値及び前記参照ピクチャーインデックスを符号化する段階と、を含み、
前記時間動きベクトル候補者は、以前に符号化された参照ピクチャー内の現在予測ユニットに対応する位置、またはその周辺に存在する予測ユニットの動きベクトルであることを特徴とするインター予測符号化方法。
(付記2)
前記時間動きベクトル候補者は、前記参照ピクチャー内の既定の第1位置及び第2位置の順序で検索して有効な動きベクトルと定められることを特徴とする付記1に記載のインター予測符号化方法。
(付記3)
前記参照ピクチャー内の既定の第1位置及び第2位置の動きベクトルがいずれも有効でない場合、前記時間動きベクトル候補者は有効でないと定めることを特徴とする付記2に記載のインター予測符号化方法。
(付記4)
スライスタイプが双方向予測である場合、前記時間動きベクトル候補者が属する参照ピクチャーを、リスト0の参照ピクチャー及びリスト1の参照ピクチャーのうち一つと定め、前記リストを特定する情報を符号化することを特徴とする付記1に記載のインター予測符号化方法。
(付記5)
前記時間動きベクトル候補者が使われるかどうかを判断し、前記情報を符号化することを特徴とする付記1に記載のインター予測符号化方法。
(付記6)
前記現在予測ユニットの有効な左側動きベクトル及び前記現在予測ユニットの有効な上側動きベクトルが前記空間動きベクトル候補者と定められることを特徴とする付記1に記載のインター予測符号化方法。
(付記7)
前記左側動きベクトル候補者は、前記現在予測ユニットの左側及び左下側に隣接している予測ユニットの動きベクトルを既定の順序で検索して得られた有効な動きベクトルであることを特徴とする付記6に記載のインター予測符号化方法。
(付記8)
前記上側動きベクトル候補者は、現在予測ユニットの上側、右上側及び左上側に隣接している予測ユニットの動きベクトルを既定の順序で検索して得られた有効な動きベクトルであることを特徴とする付記6に記載のインター予測符号化方法。
(付記9)
前記有効な空間動きベクトル候補者を適応的にスケーリングすることを特徴とする付記1に記載のインター予測符号化方法。
(付記10)
前記現在予測ユニットの参照ピクチャーと前記空間動きベクトル候補者の参照ピクチャーからの時間的距離によって前記有効な空間動きベクトル候補者をスケーリングすることを特徴とする付記1に記載のインター予測符号化方法。
Claims (3)
- 現在ブロックがインター予測モードで符号化される場合に、動き推定を行って前記現在ブロックの参照ピクチャー及び動きベクトルを定め、前記動きベクトルに基づいて前記現在ブロックの参照ピクチャーから前記現在ブロックに対応する予測ブロックを抽出し、前記現在ブロックの有効な空間動きベクトル候補または有効な時間動きベクトル候補を、前記動きベクトルを符号化するための動きベクトル予測子と定めるインター予測部と、
前記現在ブロックがイントラ予測モードで符号化される場合に、前記現在ブロックのイントラ予測モードを定め、前記イントラ予測モードによって前記現在ブロックに対応する予測ブロックを生成するイントラ予測部と、
前記現在ブロックと前記予測ブロックとの差を計算して得られた残差ブロックを変換し、変換ブロックを生成する変換部と、
前記現在ブロックが属する現在コーディングブロックについて定められた量子化ステップサイズを用いて前記変換ブロックを量子化し、量子化された変換ブロックを生成し、前記現在コーディングブロックの左側コーディングブロック、前記現在コーディングブロックの左側、上側及び直前のコーディングブロックのみを用いて前記現在コーディングブロックの量子化ステップサイズ予測子を定める量子化部と、
前記量子化された変換ブロックの量子化された変換係数をスキャンして1次元の量子化された変換係数を生成するスキャニング部と、
前記1次元の量子化された変換係数をエントロピー符号化するエントロピー符号化部と、を備え、
前記時間動きベクトル候補は、前記現在ブロックの参照ピクチャーとは異なる参照ピクチャー内の既定の第1位置の動きベクトルと第2位置の動きベクトルとを順次に検索して得られる最初の有効な動きベクトルであり、
前記現在コーディングブロックの左側及び上側コーディングブロックの量子化ステップサイズがいずれも有効ではない場合、スキャン順序上、直前のコーディングブロックの量子化ステップサイズが前記量子化ステップサイズ予測子と定められ、
前記量子化ステップサイズは、既定のサイズと同一または大きいサイズを持つコーディングブロック毎に定められ、
前記変換ブロックのサイズが4×4より大きければ、前記量子化された変換係数は複数のサブセットに分割され、
前記現在ブロックがイントラ予測モードで符号化される場合に、前記スキャニング部は、前記イントラ予測モードによって定められたスキャンパターンを用いて前記複数のサブセットをスキャンし、前記イントラ予測モードによって定められたスキャンパターンを用いて前記それぞれのサブセット内の量子化された変換係数をスキャンし、
前記現在ブロックがインター予測モードで符号化される場合に、前記スキャニング部は、既定のスキャンパターンを用いて前記複数のサブセット及び前記それぞれのサブセット内の量子化された変換係数をスキャンし、
前記複数のサブセットをスキャンするためのスキャンパターンと、前記それぞれのサブセット内の量子化された変換係数をスキャンするためのスキャンパターンとは、同一であることを特徴とする動画符号化装置。 - 前記量子化ステップサイズは、それぞれのコーディングブロック毎に定められることを特徴とする請求項1に記載の動画符号化装置。
- 前記スキャニング部は、前記複数のサブセット及び前記それぞれのサブセット内の量子化された変換係数を逆方向にスキャンすることを特徴とする請求項1に記載の動画符号化装置。
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KR1020110064306A KR20120016991A (ko) | 2010-08-17 | 2011-06-30 | 인터 프리딕션 방법 |
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