JP4789265B2 - 圧縮ビデオの高速チャンネル変更を可能にする復号化方法および装置 - Google Patents
圧縮ビデオの高速チャンネル変更を可能にする復号化方法および装置 Download PDFInfo
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
- H04N21/2355—Processing of additional data, e.g. scrambling of additional data or processing content descriptors involving reformatting operations of additional data, e.g. HTML pages
- H04N21/2356—Processing of additional data, e.g. scrambling of additional data or processing content descriptors involving reformatting operations of additional data, e.g. HTML pages by altering the spatial resolution
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Description
冗長符号化画像(redundant coded picture):画像または画像の一部の符号化(コード化)された表示。冗長符号化画像の内容は、この勧告|国際規格に従うビットストリームのための復号化プロセスによって使用されない。冗長符号化画像は、一次(プライマリ)符号化画像内のすべてのマクロブロックを含むことを要求されない。冗長符号化画像は、復号化プロセスに規準となる効果を及ぼさない。一次符号化画像も参照のこと。
一次符号化画像に属するスライスとスライス・データの区画(パーティション)に対するredundant_pic_cntは0に等しい。冗長符号化画像内の符号化スライスと符号化スライス・データの区画に対するredundant_pic_cntは0より大きい。redundant_pic_cntが存在しなければその値は0に等しいと推測される。redundant_pic_cntの値は0〜127の範囲にある。
− もしスライス・データの区画(A RBSP)のシンタクス(syntax:構文)要素が、そのスライス・データ内にカテゴリ3のシンタクス要素の存在を示すなら、スライス・データの区画(B RBSP)が存在し、スライス・データの区画(A RBSP)におけるのと同じ値のslice_idおよびredundant_pic_cntを有する。
− もしそうでなければ(スライス・データの区画A RBSPのシンタクス要素が、そのスライス・データ内にカテゴリ3のシンタクス要素の存在を示さなければ)、スライス・データの区画(A RBSP)と同じ値のslice_idとredundant_pic_cntを有するスライス・データの区画(B RBSP)は存在しない。
従来技術のこれらのおよびその他の欠点および不利な点は、圧縮されたビデオの高速チャンネル変更を行う装置と方法により対処される。
なお、特許請求の範囲と実施例との対応関係を図面で使われている参照番号で示すと次の通りである。
(1) 圧縮されたストリーム・データを受信し、復元されたビデオ出力を発生するビデオ・デコーダ200であって、
圧縮されたストリーム・データを受信し、通常ストリームとチャンネル変更ストリームを分離するデマルチプレクサ210と、
前記デマルチプレクサに結合され、圧縮された通常ストリームとチャンネル変更ストリームのうち少なくとも1つを選択可能に受信し、復元されたビデオ出力を発生する通常デコーダ212と、
前記通常デコーダに結合され、参照画像を記憶する少なくとも1つの通常フレーム記憶装置と、から成る、前記ビデオ・デコーダ200。
(2) デマルチプレクサに結合され、圧縮されたチャンネル変更ストリームを受信する低解像度のデコーダ618と、
前記低解像度デコーダに結合され、参照画像を記憶する少なくとも1つのチャンネル変更フレーム記憶装置620と、
前記低解像度デコーダに結合され、復元されたビデオ・データをアップサンプリングし、前記通常フレーム記憶装置とディスプレイのうち少なくとも1つに前記データを選択可能に出力するアップサンプリング・ユニット622と、を更に具える、(1)記載のビデオ・デコーダ。
(3) 前記通常デコーダに接続され、復元したビデオ・データを後処理し、前記少なくとも1つの通常フレーム記憶装置とディスプレイのうち少なくとも1つに前記データを選択可能に出力する後処理フィルタ716を更に具える、(1)記載のビデオ・デコーダ。
(4) 通常ストリームとチャンネル変更ストリームのうち1つから復号化するための圧縮された画像を選択する手段を更に具える、(1)記載のビデオ・デコーダ。
(5) 低解像度のチャンネル変更ストリームの画像をアップサンプリングする手段を更に具える、(4)記載のビデオ・デコーダ。
(6) ITU‐TH.264[ISO/IEC MPEG14496‐10?]規格に従う、冗長画像のシンタクスを復号化する手段を更に具える、(1)記載のビデオ・デコーダ。
(7) チャンネル変更画像を、対応する通常ストリーム画像のユーザ・データから復号化する手段を更に具える、(1)記載のビデオ・デコーダ。
(8) 通常ストリームまたはチャンネル変更ストリームの画像を後続するチャンネル変更ストリームのイントラ符号化画像のために使用すべきかを表示する、エンコーダからの信号に応答する手段を更に具える、(1)記載のビデオ・デコーダ
(9) 通常デコーダの出力を後処理し、低画質の出力から通常画質の出力への急な移行を減じる手段を更に具える、(4)記載のビデオ・デコーダ
(10) 圧縮されたストリーム・データを受信し復元されたビデオ出力を発生する、ビデオを復号化する方法900であって、
圧縮されたストリーム・データを受信し912、通常ストリームとチャンネル変更ストリームを分離するステップ914と、
圧縮された通常ストリームとチャンネル変更ストリームのうち少なくとも1つを受信し復元されたビデオ出力を発生するステップ916と、
インター符号化された画像の復号化に使用する参照画像を記憶するステップ918と、から成る、前記ビデオ復号化方法900。
(11) 通常ストリームとチャンネル変更ストリームのうちの1つから復号化するための圧縮された画像を選択するステップ、
低解像度のチャンネル変更ストリームの画像をアップサンプリングするステップ、
JVT規格に従う冗長画像のシンタクスを復号化するステップ、
チャンネル変更画像を対応する通常ストリームの画像のユーザ・データから復号化するステップ、
通常ストリームまたはチャンネル変更ストリームの画像を、後続するチャンネル変更ストリームのイントラ符号化画像のために使用すべきかを表示するエンコーダからの信号に応答するステップ、および
通常デコーダの出力を後処理し、低画質から通常画質の出力への急な移行を減じるステップ、のうちの少なくとも1つを更に含む、(10)記載のビデオ復号化方法。
(12) 通常画質のビデオ・ストリームに対応する、第1の複数のブロック変換係数と、
チャンネル変更ストリームに対応する、第2の複数のブロック変換係数と、から成る、圧縮されたディジタル・ビデオ信号。
Claims (11)
- 圧縮されたストリーム・データを受信して、復元されたビデオ出力を発生するビデオ・デコーダであって、
通常ストリーム部分とチャンネル変更ストリーム部分とを含む圧縮されたストリームを受信する受信機であって、前記通常ストリーム部分が、イントラ符号化ピクチャとインター符号化ピクチャとの両方を含み、前記チャンネル変更ストリーム部分が、前記通常ストリーム部分におけるイントラ符号化ピクチャよりも少ないビットで、かつ、前記通常ストリーム部分におけるイントラ符号化ピクチャよりも高い頻度で符号化されたイントラ符号化ピクチャを含み、前記通常ストリーム部分が、前記チャンネル変更ストリーム部分におけるよりも低い頻度で現れるイントラ符号化ピクチャを有し、前記通常ストリーム部分と前記チャンネル変更ストリーム部分とが、同一のビデオソースから生成されたビデオ・コンテンツを表す、前記受信機と、
前記受信機に接続され、特定のチャンネルをユーザーが選択することに応答して、前記圧縮されたストリームの所望の部分を選択するデマルチプレクサであって、前記圧縮されたストリームから前記通常ストリーム部分と前記チャンネル変更ストリーム部分を分離し、通常動作において、前記通常ストリーム部分のイントラ符号化ピクチャとインター符号化ピクチャを選択して通常デコーダに出力し、チャンネル変更において、前記通常ストリーム部分又は前記チャンネル変更ストリーム部分からチャンネル変更後に受信された最初のイントラ符号化ピクチャを選択して、通常動作に戻る前に通常デコーダに出力する前記デマルチプレクサと、
前記デマルチプレクサに接続され、前記デマルチプレクサによって選択された部分を受信して、復元されたピクチャを発生する通常デコーダと、
前記通常デコーダに接続され、復元されたピクチャを記憶する少なくとも1つの通常フレーム記憶装置と、
を備える前記ビデオ・デコーダ。 - デマルチプレクサに接続され、圧縮されたチャンネル変更ストリーム部分を受信する低解像度のデコーダと、
前記低解像度デコーダに接続され、参照画像を記憶する少なくとも1つのチャンネル変更フレーム記憶装置と、
前記低解像度デコーダに接続され、復元されたビデオ・データをアップサンプリングし、前記通常フレーム記憶装置とディスプレイのうち少なくとも1つに前記データを選択可能に出力するアップサンプリング・ユニットと、
を更に備える、請求項1記載のビデオ・デコーダ。 - 前記通常デコーダに接続され、復元したビデオ・データを後処理し、前記少なくとも1つの通常フレーム記憶装置とディスプレイのうち少なくとも1つに前記データを選択可能に出力する後処理フィルタを更に備える、請求項1記載のビデオ・デコーダ。
- 通常ストリーム部分とチャンネル変更ストリーム部分のうち1つから、復号化するための圧縮された画像を選択する手段を更に備える、請求項1記載のビデオ・デコーダ。
- 低解像度のチャンネル変更ストリーム部分の画像をアップサンプリングする手段を更に備える、請求項4記載のビデオ・デコーダ。
- ITU‐T H.264[ISO/IEC MPEG14496‐10]規格に従って、冗長画像のシンタクスを復号化する手段を更に備える、請求項1記載のビデオ・デコーダ。
- チャンネル変更画像を、対応する通常ストリーム画像のユーザ・データから復号化する手段を更に備える、請求項1記載のビデオ・デコーダ。
- 通常ストリーム部分またはチャンネル変更ストリーム部分の画像を後続するチャンネル変更ストリームのイントラ符号化画像のために使用すべきかを表示する、エンコーダからの信号に応答する手段を更に備える、請求項1記載のビデオ・デコーダ
- 通常デコーダの出力を後処理し、低画質の出力から通常画質の出力への急な移行を減じる手段を更に備える、請求項4記載のビデオ・デコーダ
- 圧縮されたストリーム・データを受信して、復元されたビデオ出力を発生する、ビデオ復号化方法であって、
圧縮されたストリーム・データを受信するステップであって、前記圧縮されたストリームが、通常ストリーム部分とチャンネル変更ストリーム部分とを含み、前記通常ストリーム部分が、イントラ符号化ピクチャとインター符号化ピクチャとの両方を含み、前記チャンネル変更ストリーム部分が、前記通常ストリーム部分におけるイントラ符号化ピクチャよりも少ないビットで、かつ、前記通常ストリーム部分におけるイントラ符号化ピクチャよりも高い頻度で符号化されたイントラ符号化ピクチャを含み、前記通常ストリーム部分が、前記チャンネル変更ストリーム部分におけるよりも低い頻度で現れるイントラ符号化ピクチャを有する、前記ステップと、
前記チャンネル変更ストリーム部分から前記通常ストリーム部分を分離するステップであって、通常動作において、前記通常ストリーム部分のイントラ符号化ピクチャとインター符号化ピクチャを選択して出力し、チャンネル変更において、前記通常ストリーム部分又は前記チャンネル変更ストリーム部分からチャンネル変更後に受信された最初のイントラ符号化ピクチャを選択して、通常動作に戻る前に出力する前記ステップと、
前記選択されたピクチャを受信して復号化し、復元されたピクチャを発生するステップと、
復元されたピクチャを記憶するステップと、
を備える前記方法。 - 通常ストリーム部分とチャンネル変更ストリーム部分のうちの1つから、復号化するための圧縮された画像を選択するステップ、
低解像度のチャンネル変更ストリーム部分の画像をアップサンプリングするステップ、
JVT規格に従う冗長画像のシンタクスを復号化するステップ、
チャンネル変更画像を対応する通常ストリーム部分の画像のユーザ・データから復号化するステップ、
通常ストリーム部分またはチャンネル変更ストリーム部分の画像を、後続するチャンネル変更ストリーム部分のイントラ符号化画像のために使用すべきかを表示するエンコーダからの信号に応答するステップ、および
通常デコーダの出力を後処理し、低画質から通常画質の出力への急な移行を減じるステップ、
のうちの少なくとも1つを更に備える、請求項10記載のビデオ復号化方法。
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