JP2005512418A - ワイヤレスビデオ送信のためのコンバインされたmpeg−4fgsおよび変調アルゴリズム - Google Patents
ワイヤレスビデオ送信のためのコンバインされたmpeg−4fgsおよび変調アルゴリズム Download PDFInfo
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- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/637—Control signals issued by the client directed to the server or network components
- H04N21/6377—Control signals issued by the client directed to the server or network components directed to server
- H04N21/6379—Control signals issued by the client directed to the server or network components directed to server directed to encoder, e.g. for requesting a lower encoding rate
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- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
- H04N21/43637—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
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Abstract
Description
微細粒度スケーラビリティ(FGS)プロファイルは、ストリーミングプロファイルとも呼ばれ、ストリーミングアプリケーションのためのビデオ符号化ツールとしてMPEG-4に最近採用された。FGSは2001年3月に国際標準となった。FGSはワイヤレスビデオストリーミングのためのいくつかの利点を有しており、以下の事項を含むがこれに限定されてはいない。
FGSの構成
FGSフレームワークに関するこれ以上の情報は、「The MPEG-4 Fine-Grained Scalable Video Coding Method for Multimedia Streaming over IP」(IEEE Transactions on Multimedia, Vol. 3, No. 1, March 2001, by H. Radha, M. van der Schaar, and Y. Chen)に記載されており、ここに文献援用する。
表1 コンステレーションごとのビット表示
ビット数 ビット表示 コンステレーション
2 A1A0 4QAM
4 B1B0A1A0 16QAM
6 C1C0B1B0A1A0 64QAM
8 D1D0C1C0B1B0A1A0 256QAM
図3は三つのコンステレーションサブセットを有する、本発明の代表的実施形態により使用される64QAMコンステレーションを示す図である。図3の四角形A内の全てのシンボルは同じA1とA0を有する(残りのビットはドントケアである)。図3のコンステレーションには四つのシンボルがある。これはノイズの多い4QAMコンステレーションである。完全なコンステレーションには16個のコンステレーションBサブセットシンボルがある。各コンステレーションサブセットBについてビットA1A0B1B0は同じである。これは16QAMコンステレーションと考えられる。コンステレーションCは完全なコンステレーションであり、各シンボルを使用する。各コンステレーションサブセット間にはユークリッド距離(異なるビットの数)がある。
Claims (19)
- 可変バンド幅送信のために圧縮されたビデオストリームを変調する方法であって、前記圧縮されたビデオストリームは微細粒度スケーラブル(FGS)を使用し、前記方法は
ビデオストリームのソースを設けるステップと、
ビデオ圧縮を制御する制御入力信号を生成する手段を有するディスプレイを設けるステップと、
前記ディスプレイからの前記制御入力信号に基づくFGSを有したビデオ圧縮を用いて前記ソースからの前記ビデオストリームを圧縮し、ベースレイヤーと少なくとも一つのエンハンスメントレイヤーを有する、圧縮された出力ビデオストリームを生成するステップと、
前記圧縮された出力ビデオストリームを送信するステップと、
前記送信された圧縮された出力ビデオストリームを表示するステップと
を含む方法。 - 請求項1記載の方法であって、前記ビデオ圧縮はMPEG-4FGSビデオ圧縮であることを特徴とする方法。
- 請求項1記載の方法であって、前記ビデオ圧縮は、最上位ビット(MSB)にマップされる前記ビデオストリームのベースレイヤーの量と、最下位ビット(LSB)にマップされるエンハンスメントレイヤーの量を定め、前記ビデオ圧縮は、前記圧縮されたビデオストリームのMSBにマップされる前期ベースレイヤーの量を変更するための前記ディスプレイからの前記制御入力信号により変更されることを特徴とする方法。
- 請求項3記載の方法であって、前記圧縮されたビデオストリームの送信は、前記MSBの送信に強いチャンネル符号化を用い、前記LSBの送信には前記MSBに用いたものよりは強くないチャンネル符号化を用いることを特徴とする方法。
- 請求項1記載の方法であって、前記ビデオストリームの前記ビデオ圧縮は、少なくとも一つのエンハンスされたレイヤーより低いコンステレーションに前記ベースレイヤーをマップすることを含むことを特徴とする方法。
- 請求項1記載の方法であって、前記圧縮されたビデオストリームの送信は、前記ベースレイヤーに強いチャンネルコーディングを使用し、少なくとも一つのエンハンスされたレイヤーにベースレイヤーに使用したよりは強くないチャンネルコーディングを使用することを特徴とする方法。
- 請求項6記載の方法であって、前記チャンネル符号化は前記送信されたビデオストリームの物理レイヤーの階層的変調により強くおよび強くなくされることを特徴とする方法。
- 請求項6記載の方法であって、前記チャンネル符号化は前記送信されたビデオストリームの物理レイヤーの時分割変調により強くおよび強くなくされることを特徴とする方法。
- 可変バンド幅送信のための圧縮されたビデオストリームを変調する方法であって、前記圧縮されたビデオストリームはFGSを使用し、前記方法は、
ビデオストリームのソースを設けるステップと、
エラー訂正符号生成を制御する制御入力信号を生成する手段を有するディスプレイを設けるステップと、
圧縮された出力ビデオストリームを生成するためにFGSを伴う圧縮を用いて前記ソースからの前記ビデオ信号を圧縮するステップと、
前記ディスプレイからの制御入力信号に基づき、前記圧縮されたビデオストリームのエラー訂正符号を生成するステップと、
エラー訂正符号つき圧縮された出力ビデオストリームを生成するために、前記生成されたエラー訂正符号を前記圧縮された出力ビデオストリームに付加するステップと、
前記エラー訂正符号つき圧縮された出力ビデオストリームを送信するステップと、
前記送信されたエラー訂正符号つき圧縮された出力ビデオストリームを表示するステップとを含む方法。 - 請求項9記載の方法であって、前記ビデオ圧縮はMPEG-4FGSビデオ圧縮であることを特徴とする方法。
- 可変バンド幅送信のための圧縮されたビデオストリームを変調する方法であって、前記圧縮されたビデオストリームはFGSを使用し、前記方法は、
ビデオストリームのソースを設けるステップと、
ビデオシンボルのコンステレーションへのマッピングを制御するための制御入力信号を生成する手段を有するディスプレイを設けるステップと、
圧縮された出力ビデオストリームを生成するためにFGSを用いた圧縮を使用して前記ソースからの前記ビデオストリームを圧縮するステップと、
前記ディスプレイからの前記制御入力信号に基づいて制御して、ビデオシンボルをコンステレーションにマップするステップと、
前記圧縮された出力ビデオストリームを送信するステップと、
前記送信された圧縮された出力ビデオストリームを表示するステップと
を含む方法。 - 請求項11記載の方法であって、前記ビデオ圧縮はMPEG-4FGS圧縮であることを特徴とする方法。
- 可変バンド幅送信のために圧縮されたビデオストリームを変調するシステムであって、前記圧縮されたビデオストリームは微細粒度スケーラブル(FGS)を使用し、前記システムは
ビデオストリームのソースと、
ビデオ圧縮を制御する制御入力信号を生成する手段を有するディスプレイと、
前記ディスプレイからの前記制御入力信号に基づき、ビデオストリームの前記ソースからの圧縮された出力ビデオストリームを生成する、FGSを有するビデオ圧縮エンジンと、
前記圧縮された出力ビデオストリームを前記ディスプレイに送信するトランスミッタと
が設けられたシステム。 - 請求項13記載のシステムであって、前記ビデオ圧縮はMPEG-4FGSビデオ圧縮であるシステム。
- 請求項13記載のシステムであって、さらに、前記圧縮されたビデオストリームのためにエラー訂正符号を生成するエラー訂正符号ジェネレータが設けられ、前記エラー訂正符号は前記圧縮されたビデオストリームに付加され、前記ディスプレイの前記制御入力信号は前記エラー訂正符号ジェネレータを制御することを特徴とするシステム。
- 請求項13記載のシステムであって、さらに、前記圧縮されたビデオストリームの送信の前に前記圧縮されたビデオストリームのビデオシンボルをコンステレーションにマップするシンボルマッパーが設けられ、前記ディスプレイの前記制御入力信号は前記シンボルマッパーを制御することを特徴とするシステム。
- 請求項13記載のシステムであって、前記圧縮されたビデオストリームのチャンネル符号化は、前記圧縮されたビデオストリームの送信の前に物理レイヤーの階層的変調により強くまたは強くなくされることを特徴とするシステム。
- 請求項13記載のシステムであって、前記圧縮されたビデオストリームのチャンネル符号化は、前記圧縮されたビデオストリームの送信の前に物理レイヤーの時分割変調により強くまたは強くなくされることを特徴とするシステム。
- 可変バンド幅送信のためのMPEG-4FGS圧縮ビデオストリームを変調する方法であって、
ビデオストリームのソースを設けるステップと、
ビデオ圧縮、エラー訂正符号生成、またはシンボルコンステレーションマッピングのうち一以上を制御するための制御入力信号を生成する手段を有するディスプレイを設けるステップと、
圧縮された出力ビデオストリームを生成するために、前記ディスプレイからの前記制御入力信号に基づきオプションとして実行される、FGSを有するビデオ圧縮を用いて前記ソースからの前記ビデオストリームを圧縮するステップと、
前記ディスプレイからの前記制御入力信号に基づきオプションとして制御される、前記圧縮されたビデオストリームのためにエラー訂正符号の生成と付加をするステップと、
前記ディスプレイからの前記制御入力信号に基づきオプションとして制御される、ビデオシンボルのコンステレーションへのマッピングをするステップと、
前記圧縮出力ビデオストリームを送信するステップと、
前記送信された圧縮出力ビデオストリームを表示するステップと
を含む方法。
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US10/011,997 US6909753B2 (en) | 2001-12-05 | 2001-12-05 | Combined MPEG-4 FGS and modulation algorithm for wireless video transmission |
PCT/IB2002/004797 WO2003049449A2 (en) | 2001-12-05 | 2002-11-14 | Modulation algorithm for a mpeg-4 fgs wireless transmission system |
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- 2002-11-14 EP EP02783383A patent/EP1459547A2/en not_active Withdrawn
- 2002-11-14 JP JP2003550508A patent/JP2005512418A/ja active Pending
- 2002-11-14 KR KR10-2004-7008601A patent/KR20040065234A/ko not_active Application Discontinuation
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JP2011172297A (ja) * | 2004-08-27 | 2011-09-01 | Siemens Ag | 符号化および復号のための方法および装置 |
US8477591B2 (en) | 2009-08-19 | 2013-07-02 | Canon Kabushiki Kaisha | Control apparatus, control method and computer program of communication system |
KR20150102026A (ko) * | 2012-12-27 | 2015-09-04 | 마이크로소프트 테크놀로지 라이센싱, 엘엘씨 | 니어 아이 디스플레이를 위한 디스플레이 업데이트 시간 감소 기법 |
JP2016510525A (ja) * | 2012-12-27 | 2016-04-07 | マイクロソフト テクノロジー ライセンシング,エルエルシー | ニアアイ・ディスプレイのディスプレイ更新時間の低減 |
US10514541B2 (en) | 2012-12-27 | 2019-12-24 | Microsoft Technology Licensing, Llc | Display update time reduction for a near-eye display |
KR102192927B1 (ko) * | 2012-12-27 | 2020-12-18 | 마이크로소프트 테크놀로지 라이센싱, 엘엘씨 | 니어 아이 디스플레이를 위한 디스플레이 업데이트 시간 감소 기법 |
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US6909753B2 (en) | 2005-06-21 |
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EP1459547A2 (en) | 2004-09-22 |
US20030103571A1 (en) | 2003-06-05 |
AU2002347449A8 (en) | 2003-06-17 |
WO2003049449A3 (en) | 2003-09-25 |
KR20040065234A (ko) | 2004-07-21 |
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