JP6383425B2 - ビデオ符号化及び復号のための適応的伝達関数 - Google Patents
ビデオ符号化及び復号のための適応的伝達関数 Download PDFInfo
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Description
本開示は概して、デジタルビデオ又は画像処理及びディスプレイに関する。
パーソナルコンピュータシステム、デスクトップコンピュータシステム、ラップトップコンピュータ及びノートブックコンピュータ、タブレットデバイス又はパッドデバイス、デジタルカメラ、デジタルビデオレコーダ、並びに携帯電話又はスマートフォンを含むがこれらに限られない種々のデバイスは、ビデオ処理法(単数又は複数)を実行し得るソフトウェア及び/又はハードウェアを含むことができる。例えば、デバイスとして、1つ以上のビデオ処理法に従って、1つ以上のソースからデジタルビデオ入力を受信して処理し、処理したビデオフレームを出力することができる装置(例えば、システムオンチップ(SOC)などの集積回路(IC)又はICのサブシステム)を挙げることができる。別の実施例として、1つ以上のビデオ処理法に従って、1つ以上のソースからデジタルビデオ入力を受信して処理し、処理されたビデオフレームを1つ以上の行先に出力し得るデバイス上に、ソフトウェアプログラムが実行され得る。
一次及び二次伝達関数
例示的なデバイス及び装置
例示的なシステムオンチップ(SOC)
多機能デバイスの実施例
●電話モジュール2138、
●ビデオ会議モジュール2139、
●静止画像及び/又はビデオ画像処理用のカメラモジュール2143、
●画像管理モジュール2144、
●ブラウザモジュール2147、
●検索モジュール2151、
●ビデオ再生モジュール及び音楽再生モジュールから成ることができるビデオ及び音楽再生モジュール2152、及び/又は
●オンラインビデオモジュール2155。
コンピュータシステムの例
Claims (18)
- システムであって、
ビデオ符号器であって、
符号化形式に従ってビデオデータを処理して符号化ビデオデータを生成するように構成された処理パイプラインであって、前記ビデオデータは前記処理パイプライン内でCビットのビット深度で表現される、処理パイプラインと、
適応的伝達関数構成要素と、を含むビデオ符号器を備え、前記適応的伝達関数構成要素は、
Nビットの入力ビデオデータであって、前記入力ビデオデータの輝度の全ダイナミックレンジは伝達関数に従って決定されるNビットのコード値により表現され、N>Cである、入力ビデオデータを受信し、
前記入力ビデオデータに対する人間の視覚系の有効ダイナミックレンジであって、前記有効ダイナミックレンジは前記入力ビデオデータの前記全ダイナミックレンジよりも小さい、有効ダイナミックレンジを決定し、
ここで、前記入力ビデオデータに対する前記人間の視覚系の有効ダイナミックレンジを決定するために、前記適応的伝達関数構成要素は、
前記入力ビデオデータの輝度値から前記入力ビデオデータの明度を判定し、
前記入力ビデオデータの前記判定された明度に従って前記有効ダイナミックレンジを決定する
ように構成され、
前記決定された有効ダイナミックレンジに対応する、前記入力ビデオデータにおけるNビットのコード値の範囲を決定し、
前記処理パイプラインにおいてビデオデータを表現するために使用される伝達関数に従ってNビットのコード値の前記決定された範囲内の前記Nビットのコード値をCビットのコード値へとマッピングして、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを表現するCビットのビデオデータを生成し、
前記Cビットのビデオデータを処理のために前記処理パイプラインへと出力する
ように構成される、
システム。 - 前記適応的伝達関数構成要素は、1つ以上のビデオフレームのそれぞれに対して又は2つ以上のビデオフレームの1つ以上のシーケンスのそれぞれに対して、前記受信する、前記人間の視覚系の有効ダイナミックレンジを前記決定する、Nビットのコード値の範囲を前記決定する、前記マッピングする、及び前記出力する、を実行するように構成される、請求項1に記載のシステム。
- 前記適応的伝達関数構成要素は、1つ以上のビデオフレームのそれぞれの内部の2つ以上の領域に対して、前記受信する、前記人間の視覚系の有効ダイナミックレンジを前記決定する、Nビットのコード値の範囲を前記決定する、前記マッピングする、及び前記出力する、を実行するように構成される、請求項1に記載のシステム。
- 前記処理パイプラインは、形式メタデータを前記符号化ビデオデータ内に含めるように更に構成され、前記形式メタデータは、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジのインジケーションを含む、請求項1に記載のシステム。
- ビデオ復号器を更に備えるように構成され、前記ビデオ復号器は、
前記ビデオ符号器により出力された符号化ビデオデータを受信し、
前記符号化ビデオデータを処理して、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを表現するCビットの復号ビデオデータ及び抽出された形式メタデータを生成し、
前記Cビットの復号ビデオデータを拡張して、目標デバイスの全ダイナミックレンジを範囲に含むDビットのビデオデータを生成し、ここでD>Cである、
ように構成され、
前記Cビットの復号ビデオデータを拡張するために、前記ビデオ復号器の逆適応的伝達関数構成要素が、前記形式メタデータにおいて示される前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを、前記目標デバイスの前記全ダイナミックレンジへとマッピングする、
請求項4に記載のシステム。 - 前記目標デバイスは高ダイナミックレンジ(HDR)対応デバイスである、請求項5に記載のシステム。
- 前記処理パイプラインにおいてビデオデータを表現するために使用される前記伝達関数は、前記入力ビデオデータを表現するために使用される前記伝達関数と同じである、請求項1に記載のシステム。
- 前記処理パイプラインにおいてビデオデータを表現するために使用される前記伝達関数は、前記入力ビデオデータを表現するために使用される前記伝達関数と異なる、請求項1に記載のシステム。
- 前記処理パイプラインにおいてビデオデータを表現するために使用される前記伝達関数は、不連続的な伝達関数表現であって、前記入力ビデオデータを表現するために使用される前記伝達関数の1つ以上の部分を含み、かつ異なる伝達関数を残りの前記伝達関数表現に対して使用する、不連続的な伝達関数表現である、請求項1に記載のシステム。
- 前記処理パイプラインは、処理されたフレームに関する基準データをメモリに格納するように構成され、前記基準データは前記フレームに対して前記適応的伝達関数構成要素により決定された有効ダイナミックレンジを含み、前記入力ビデオデータに対する前記人間の視覚系の前記有効ダイナミックレンジを決定するために、前記適応的伝達関数構成要素は更に、
前記格納された基準データから1つ以上の処理されたフレームに対する前記有効ダイナミックレンジを取得し、
前記1つ以上の処理されたフレームに対する前記有効ダイナミックレンジに少なくとも部分的に従って、前記処理パイプラインにより処理される現在のフレームに対する有効ダイナミックレンジを決定する
ように構成される、請求項1に記載のシステム。 - 前記入力ビデオデータに対する前記人間の視覚系の前記有効ダイナミックレンジを決定するために、前記適応的伝達関数構成要素は更に、
前記入力ビデオデータの値から前記入力ビデオデータのテクスチャを判定し、
前記入力ビデオデータの前記判定された明度及び前記入力ビデオデータの前記判定されたテクスチャに従って前記有効ダイナミックレンジを決定する
ように構成される、請求項1に記載のシステム。 - 前記処理パイプラインにおいてビデオデータを表現するために使用される前記伝達関数に従ってNビットのコード値の前記決定された範囲内の前記Nビットのコード値をCビットのコード値へとマッピングして、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを表現するCビットのビデオデータを生成するために、前記適応的伝達関数構成要素は、前記入力ビデオデータにおける前記Nビットのコード値をNビットのコード値の前記範囲へとクロップしてクロップされたNビットのビデオデータを生成し、かつ前記クロップされたNビットのビデオデータの値を量子化してCビットのビデオデータの値を生成するように構成される、請求項1に記載のシステム。
- 現在のビデオフレームを前記符号化形式に従って処理して符号化ビデオデータを生成するために、前記処理パイプラインは、1つ以上の以前に処理されたビデオフレームからの基準データを用いて前記現在のビデオフレームに対するインターフレーム動き推定を実行するように構成され、前記システムは、前記基準データを用いて前記現在のビデオフレームに対する前記インターフレーム動き推定を実行する前に、前記基準データを、前記現在のフレームに対して決定された前記有効ダイナミックレンジへと変換するように構成された、形式変更構成要素を更に含む、請求項1に記載のシステム。
- 前記符号化形式はH.264/高度ビデオ符号化(AVC)形式又はH.265高効率ビデオ符号化(HEVC)形式のうちの1つである、請求項1に記載のシステム。
- 方法であって、
ビデオ符号器の適応的伝達関数構成要素によって、
入力ビデオデータに対する人間の視覚系の有効ダイナミックレンジを決定することであって、前記入力ビデオデータの輝度の全ダイナミックレンジは、伝達関数に従って決定されるNビットのコード値により表現される、ことと、
ここで、前記入力ビデオデータに対する前記人間の視覚系の有効ダイナミックレンジを決定することは、
前記入力ビデオデータの輝度値から前記入力ビデオデータの明度を判定することと、
前記入力ビデオデータの前記判定された明度に従って前記有効ダイナミックレンジを決定することと、
を含み、
前記入力ビデオデータを前記決定された有効ダイナミックレンジに対応するNビットのコード値の範囲へとクロップしてクロップされたNビットのビデオデータを生成することと、
前記クロップされたNビットのビデオデータを量子化して、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを表現するCビットのビデオデータを生成することであって、N>Cである、ことと、
を実行することと、
前記ビデオ符号器の処理パイプラインによって、前記Cビットのビデオデータを符号化形式に従って処理して符号化ビデオデータを出力として生成することと、
を含む、方法。 - ビデオ復号器によって、
前記ビデオ符号器により出力された前記符号化ビデオデータを受信することと、
前記符号化ビデオデータを復号して、前記入力ビデオデータの前記人間の視覚系の前記決定された有効ダイナミックレンジを表現する復号されたCビットのビデオデータを生成することと、
前記復号されたCビットのビデオデータを拡張して、高ダイナミックレンジ(HDR)対応デバイスの全ダイナミックレンジを範囲に含むDビットのビデオデータを生成することであって、D>Cである、ことと、
を実行することを更に含み、
前記復号されたCビットのビデオデータを拡張することは、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを、前記HDR対応デバイスの前記全ダイナミックレンジへとマッピングすることを含む、
請求項15に記載の方法。 - 前記有効ダイナミックレンジは、現在のシーン、シーケンス、フレーム、又はフレームの領域に対して決定される、請求項15に記載の方法。
- 装置であって、
適応的伝達関数構成要素であって、
入力ビデオデータに対する人間の視覚系の有効ダイナミックレンジを決定し、ここで、前記入力ビデオデータの輝度の全ダイナミックレンジは、伝達関数に従って決定されるNビットのコード値により表現され、
ここで、前記入力ビデオデータに対する前記人間の視覚系の有効ダイナミックレンジを決定するために、前記適応的伝達関数構成要素は、
前記入力ビデオデータの輝度値から前記入力ビデオデータの明度を判定し、
前記入力ビデオデータの前記判定された明度に従って前記有効ダイナミックレンジを決定する
ように構成され、
前記決定された有効ダイナミックレンジに対応する、前記入力ビデオデータにおけるNビットのコード値の範囲を決定し、
前記入力ビデオデータを、前記決定された有効ダイナミックレンジに対応するNビットのコード値の範囲へとクロップして、クロップされたNビットのビデオデータを生成し、
前記クロップされたNビットのビデオデータを符号器構成要素の伝達関数に従って量子化して、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを表現するCビットのビデオデータを生成し、ここでN>Cである、
ように構成された、適応的伝達関数構成要素と、
前記Cビットのビデオデータを符号化形式に従って処理して符号化ビデオデータを出力として生成するように構成された、前記符号器構成要素と、
前記符号器構成要素により出力された前記符号化ビデオデータを処理して、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを表現する復号されたCビットのビデオデータを生成するように構成された復号器構成要素と、
前記復号されたCビットのビデオデータを拡張して、目標デバイスの全ダイナミックレンジを範囲に含むDビットのビデオデータを生成するように構成され、ここでD>Cである、逆適応的伝達関数構成要素と、
を備え、
前記復号されたCビットのビデオデータを拡張するために、前記逆適応的伝達関数構成要素は、前記入力ビデオデータに対する前記人間の視覚系の前記決定された有効ダイナミックレンジを、前記目標デバイスの前記全ダイナミックレンジへとマッピングする、
装置。
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