JP6163598B2 - 映像符号化装置 - Google Patents
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Description
図2を参照すれば、イントラ予測部140は、予測ユニット受信部141、参照画素生成部142、予測ブロック生成部143、予測ブロック後処理部144、予測モード決定部145及び予測モード符号化部146を備える。
(付記1) イントラ予測復号化装置において、
受信されたビートストリームから量子化された残差係数、イントラ予測情報及び予測ユニットのサイズ情報を復元するエントロピー復号化部と、
前記エントロピー復号化部から受信されたイントラ予測情報及び現在予測ユニットのサイズ情報に基づいて、現在予測ユニットのイントラ予測モードを復元する予測モード復号化部と、
前記予測モード復号化部から受信されたイントラ予測モードによって、残差信号を復元する残差信号復号化部と、
現在予測ユニットの利用不可能な参照画素を生成し、予測モード復号化部から受信された現在予測ユニットのイントラ予測モードに基づいて、参照画素を適応的にフィルタリングする参照画素生成部と、
前記予測モード復号化部から受信されたイントラ予測モードに対応する参照ピクセルを用いて、予測ブロックを生成する予測ブロック生成部と、
前記予測モード復号化部から受信されたイントラ予測モードによって、前記予測ブロック生成部から生成された予測ブロックを適応的にフィルタリングする予測ブロック後処理部と、
前記予測モード復号化部から受信されたイントラ予測モードによって、予測ブロック生成部または予測ブロックフィルタリング部から予測ユニット単位で予測ブロックを受信し、前記残差信号復号化部から受信された、復元された残差ブロックを用いて復元映像を生成する映像復元部と、を備えるイントラ予測復号化装置。
(付記2) 前記参照画素生成部は、水平モードまたは垂直モードを基準として45゜方向性を持つイントラ予測モード(モード番号3、6、9)と、前記水平モードまたは垂直モード間の方向性を持つイントラ予測モードとに対しては、予測ユニットのサイズによって適応的に参照ピクセルをフィルタリングすることを特徴とする付記1に記載のイントラ予測復号化装置。
(付記3) 前記参照画素生成部は、既定のサイズより小さな予測ユニットの参照ピクセルに対しては、フィルターを適用しないことを特徴とする付記1に記載のイントラ予測復号化装置。
(付記4) 前記参照画素生成部は、水平モードまたは垂直モードと45゜方向性を持つイントラ予測モード(モード番号3、6または9)の方向間に存在する第1方向性モードと第2方向性モードのうち、第1方向性モードが第2方向性モードより前記45゜方向性を持つイントラ予測モードにさらに隣接している方向性を持つ場合、第2方向性モードの参照ピクセルにフィルターを適用すれば、第1方向性モードの参照ピクセルにもフィルターを適用することを特徴とする付記1に記載のイントラ予測復号化装置。
(付記5) 前記予測ブロック生成部は、イントラ予測モードが平面モード(planar mode)である場合、コーナー参照画素、左側参照画素及び上側参照画素を用いて予測ブロックの参照画素を生成することを特徴とする付記1に記載のイントラ予測復号化装置。
(付記6) イントラ予測モードが垂直モードである場合、前記参照画素生成部は、参照画素をフィルタリングせず、前記予測ブロック後処理部は、予測ブロック内の一部画素をフィルタリングするために、予測ブロックの生成に用いられていない参照画素を用いることを特徴とする付記1に記載のイントラ予測復号化装置。
(付記7) 前記参照画素生成部は、イントラ予測モードが、垂直モードと45゜方向性を持つイントラ予測モード(モード番号6)、または前記モードに隣接する方向性を持つ既定数の範囲内のイントラ予測モードである場合、上側参照画素及び左側参照画素を用いて予測ブロックを生成することを特徴とする付記1に記載のイントラ予測復号化装置。
Claims (4)
- 現在ブロックのイントラ予測モードを定め、利用不可能な参照画素に対応する参照画素を生成し、前記イントラ予測モードによって参照画素を適応的にフィルタリングし、かつ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て変換ブロックを生成する変換部と、
前記変換ブロックを量子化して量子化ブロックを生成する量子化部と、
前記イントラ予測モードによって定められるスキャンパターンを用いて前記量子化ブロックの量子化係数をスキャンするスキャニング部と、
前記スキャニング部によってスキャニングされた前記量子化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、
前記イントラ予測部は、水平モードを基準として45゜方向性を持つイントラ予測モードと前記水平モードとの間に位置するイントラ予測モードについては、予測ブロックのサイズによって適応的に参照画素をフィルタリングし、
前記イントラ予測部は、前記水平モードを基準として45゜方向性を持つイントラ予測モードの参照画素にフィルターを適用し、前記水平モードの参照画素にはフィルターを適用せず、
第1方向性モード及び第2方向性モードは、前記水平モードと、前記水平モードを基準として45゜方向性を持つイントラ予測モードとの間に位置し、
前記イントラ予測部は、前記第2方向性モードの参照画素にフィルターを適用すれば、前記第2方向性モードよりは前記水平モードを基準として45゜方向性を持つイントラ予測モードにさらに近い第1方向性モードの参照画素にもフィルターを適用し、
前記変換ブロックのサイズが8×8であれば、前記量子化ブロックの量子化係数は複数のサブセットに分割され、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る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、かつ前記イントラ予測モードによって定められる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係数をスキャンし、
前記それぞれのサブセット内の量子化係数及び前記複数のサブセットは逆方向にスキャンされることを特徴とする映像符号化装置。 - 前記フィルターが適用されるイントラ予測モードの数は、前記予測ブロックのサイズが増加するにつれて増加することを特徴とする請求項1に記載の映像符号化装置。
- 前記参照画素生成部は、前記予測ブロックのサイズが予め設定されているサイズより小さければ、参照画素にフィルターを適用しないことを特徴とする請求項1または2に記載の映像符号化装置。
- 前記それぞれのサブセット内の量子化された残差係数をスキャンするためのスキャンパターンと、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は同一であることを特徴とする請求項1に記載の映像符号化装置。
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