JP2008072578A - 映像制御装置及びその方法 - Google Patents
映像制御装置及びその方法 Download PDFInfo
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Abstract
【解決手段】 デジタル放送等を録画したコピーワンス制限付きコンテンツを外部に出力する場合に、その出力の態様を管理し、出力の態様に応じて、オリジナルコンテンツの再生に対して制限を設ける。また、出力したコンテンツを戻すことにより再生に対する制限が解除される。
【選択図】 図1
Description
まず、映像制御装置100における、通常の再生動作を説明する。
一度も出力したことの無いコンテンツの再生可能なビットレートの最大値x(但し、xは正数)はオリジナルのビットレート(この例では24Mbps)となる。よって図2のフローではS0からスタートして、まずS1そしてS3に進む。次に出力のビットレートは300kbpsだが、切り上げて1Mbps(この切り上げは再生可能なビットレートの最大値を算出する時にのみ行われる。出力ビットレートを300kbpsと指示したにもかかわらず1Mbpsで実際に出力する訳ではない)となりS3の分岐はS4に進むことになる。S4の分岐では、再生可能なビットレートの最大値と出力ビットレートとの差(最大−出力)のビットレートの計算結果を参照している。この例では24−1=23MbpsなのでS7に進み、再生可能なビットレートの最大値は15Mbpsとなる。ここで、24Mbpsのコンテンツから300kbpsのコンテンツを出力したにもかかわらず、再生可能なビットレートの最大値が23.7Mbpsではなく、15Mbpsにまで低下していることに注目していただきたい。外部に出力した300Kbps分、ビットレートを低下させても見た目にはほとんど画質は変化しないため、(厳密な意味ではコピーではないのだが)ユーザーの体感的にはコピーを行ったかのように見えてしまう。これではコピーワンスの概念を大きく逸脱してしまうため、あえて外部に出力する動作に対するペナルティを与えるようなアルゴリズムとした。
また、出力ビットレート(第1のビットレート)と再生可能なビットレートの最大値(第2のビットレート)の和は、オリジナルコンテンツのビットレート(入力した映像データのビットレート)より小さく設定される。
2 復調部
3 DEMUX
4 第一デコーダ
5 第一エンコーダ
6 第二エンコーダ
7 解像度変換
8 デジタルI/F
9 表示器
10 暗号化キー群
11 ローカル復号部
12 ローカル暗号化部
13 出力コンテンツ管理テーブル
14 コンテンツ/暗号キー照合テーブル
15 記憶装置(HDD)
16 第二デコーダ
17 一時バッファ
18 第一外部メディアI/F
19 第二外部メディアI/F
20 CPU
21 リモコン
22 リモコンI/F
Claims (8)
- 入力した映像データのビットレートを変換して出力する映像制御装置において、前記映像データをデコードする第1のデコーダと、前記第1のデコーダの出力を変換されたビットレートでエンコードするエンコーダと、前記エンコーダにより第1のビットレートでエンコードされた映像データを記録媒体に出力するための出力部と、前記エンコーダにより第2のビットレートでエンコードされた映像データを再デコ−ドする第2のデコーダと、前記第2のビットレートを、前記第1のビットレートに基いて決定する制御部とを有することを特徴とする映像制御装置。
- 前記第1のビットレートと前記第2のビットレートとの和が、前記入力した映像データのビットレートより小さいことを特徴とする請求項1記載の映像制御装置。
- 前記入力した映像データを暗号化する暗号化部と、暗号化された映像データを記憶する記憶部とを有し、前記制御部は、ユーザからの指示に基いて、前記記憶部より所定の映像データを読み出し、前記暗号化を解除して、前記第1のデコーダに出力するように前記記憶部及び前記暗号化部を制御する請求項2記載の映像制御装置。
- 前記第1のデコーダまたは、前記第2のデコーダによりデコードされた映像データの解像度を変換する解像度変換部と、表示器で映像を表示できるように前記解像度変換部により解像度変換された映像データのフォーマットを変換するデジタルインターフェイスとを有する請求項2記載の映像制御装置。
- 前記第1のビットレートが所定のビットレートk(Mbps)(但し、kは正数)より小さい場合には、前記第2のビットレートを所定値m(Mbps)(但し、mは正数)に設定する請求項2記載の映像制御装置。
- 前記所定のビットレートk、前記所定値m、及び前記入力した映像データのビットレートx(Mbps)(但し、xは正数)は、0.1<k/x<0.3、0.5<m/x<0.8の関係を有する請求項5記載の映像制御装置。
- 前記制御部は、前記記録媒体に出力された映像データが戻されたときに前記第2のビットレートを、前記記録媒体に出力する前に設定されていたビットレートに戻すことを特徴とする請求項2記載の映像制御装置。
- 入力した映像データのビットレートを変換して出力する映像制御方法において、前記映像データをデコードする第1のデコードステップと、前記第1のデコードステップでデコードされた映像データを、変換されたビットレートでエンコードするエンコードステップと、前記エンコードステップにより第1のビットレートでエンコードされた映像データを記録媒体に出力するための出力ステップと、前記エンコードステップにより第2のビットレートでエンコードされた映像データを再デコ−ドする第2のデコードステップとを有し、前記第2のビットレートは、前記第1のビットレートに基いて決定されることを特徴とする映像制御方法。
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JP2006250903A JP4785687B2 (ja) | 2006-09-15 | 2006-09-15 | 映像制御装置及びその方法 |
KR1020070091893A KR100920733B1 (ko) | 2006-09-15 | 2007-09-11 | 영상 제어장치 및 그 방법 |
US11/854,196 US8179959B2 (en) | 2006-09-15 | 2007-09-12 | Picture control device and method of the same |
EP07116449A EP1901293A1 (en) | 2006-09-15 | 2007-09-14 | Picture control device and method |
CN2007101515062A CN101146200B (zh) | 2006-09-15 | 2007-09-14 | 影像控制装置及其方法 |
US13/450,231 US8750302B2 (en) | 2006-09-15 | 2012-04-18 | Picture control device and method of the same |
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EP (1) | EP1901293A1 (ja) |
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US8179959B2 (en) | 2012-05-15 |
US8750302B2 (en) | 2014-06-10 |
US20120201516A1 (en) | 2012-08-09 |
CN101146200A (zh) | 2008-03-19 |
CN101146200B (zh) | 2010-12-22 |
EP1901293A1 (en) | 2008-03-19 |
KR100920733B1 (ko) | 2009-10-07 |
US20080069204A1 (en) | 2008-03-20 |
JP4785687B2 (ja) | 2011-10-05 |
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