JP3606653B2

JP3606653B2 - Digital image data recording apparatus and method, and digital image data reproducing apparatus and method

Info

Publication number: JP3606653B2
Application number: JP27985995A
Authority: JP
Inventors: 昇小森
Original assignee: Fuji Photo Film Co Ltd
Current assignee: Fujifilm Holdings Corp
Priority date: 1995-10-04
Filing date: 1995-10-04
Publication date: 2005-01-05
Anticipated expiration: 2015-10-04
Also published as: JPH09102928A

Description

【０００１】
【技術分野】
この発明は，ディジタル・ビデオ・テープ・レコーダのように記録媒体の単位画像データ記録領域に，所定のデータ量をもつ単位画像データを記録するディジタル画像データ記録装置および方法ならびにこのようにして記録されている記録媒体から画像データを再生する装置および方法に関する。
【０００２】
【発明の背景】
ディジタル・ビデオ・テープ・レコーダ（ＤＶＴＲ）は，ＣＣＤのような固体電子撮像素子を用いて被写体を撮像し，撮像により得られた被写体像を表わす映像信号をディジタル画像データに変換して磁気テープに記録するものである。ディジタル・ビデオ・テープ・レコーダの撮像部に用いられるＣＣＤは水平方向７２０画素×垂直方向４８０画素＝約３５万画素のものが一般的である。ディジタル・ビデオ・テープ・レコーダにおいては２フィールドで１フレームを構成しフレーム画像を記録するフレーム記録と，１フィールドごとのフィールド画像を記録するフィールド記録とが可能である。フレーム記録の場合は所定のシャッタ速度で１／３０秒の周期で連続的に撮影が行なわれ，フィールド記録の場合は所定のシャッタ速度で１／６０秒の周期で連続的に撮影が行なわれる。フレーム記録およびフィールド記録のいずれにおいても１フレーム分の画像データは１／３０秒の時間をかけて，かつ１０トラックの記録領域を用いて磁気テープに記録される。
【０００３】
このようにディジタル・ビデオ・テープ・レコーダにおいては，３５万画素のＣＣＤを用いて被写体を撮影して得られるディジタル画像データのうち１フレーム分の画像データを１／３０秒かけて１０トラックに記録するのが一般的であり，この記録方式が業界における標準的な規格となっている（たとえば，ＮＩＫＫＥＩＥＬＥＣＴＲＯＮＩＣＳＢＯＯＫＳ「データ圧縮とディジタル変調」第１３７頁〜第１５２頁，日経ＢＰ社，１９９３年を参照）。
【０００４】
一方，ディジタル・ビデオ・テープ・レコーダの撮像部における画質は，ＣＣＤの画素数に依存し，ＣＣＤの画素数が多ければ多いほど向上する。しかしながら，画質を向上させるために画素数の多いＣＣＤを用い，このＣＣＤから得られた画像データを磁気テープに記録するには画像データの記録に１／３０秒以上の時間，１０トラック以上の記録領域が必要となりディジタル・ビデオ・テープ・レコーダの上述した規格に合わなくなってしまう。
【０００５】
画素数の多いＣＣＤを用いて被写体を撮像して得られた画像データを既存の記録の規格との互換性を保ちながら記録媒体に記録するには，得られた画像データを１フレーム分の画像データ量に分割して記録すればよい。
【０００６】
しかしながら画素数の多いＣＣＤから得られた画像データのデータ量が１フレーム分の画像データ量になるように，画像データを単に分割して分割画像データを磁気テープに記録すると，再生された分割画像データによって表わされる分割画像が何を表わしているのかわからないことがある。再生画像を見ている操作者は装置に故障が生じたと思いちがいすることがある。
【０００７】
【発明の開示】
この発明は，ディジタル・ビデオ・テープ・レコーダの記録の規格のような既存の規格との互換性を保ちながら，高画質の静止画像を得るために，撮像によってデータ量の多い画像データを得，この画像データを分割して記録媒体に記録した場合に，分割された画像データによって表わされる画像であることを再生時に分るようにすることを目的とする。
【０００８】
この発明によるディジタル画像データ記録装置は，一駒の画像について単位画像データの画像データ量のｎ倍のデータ量を生成する固体電子撮像素子を含み，上記固体電子撮像素子を用いて被写体を撮像して得られた被写体像を表わす精細画像データを出力する撮像手段，上記撮像手段から出力される精細画像データのデータ量が上記単位画像データのデータ量と等しくなるように，上記精細画像データをｎ個の分割画像データに分割する画像データ分割手段，上記画像データ分割手段により得られた分割画像データによって表わされる分割画像が，上記精細画像のどこの部分に相当するのかを表わす識別データを発生する識別データ発生手段，上記画像データ分割手段から出力されるｎ個の分割画像データを，記録媒体のｎ個の単位画像データ記録領域に記録する分割画像データ記録制御手段，および上記識別データ発生手段によって発生する識別データを，ｎ個の上記分割画像データに関連付けて上記記録媒体の単位画像データ記録領域以外の補助領域に記録する識別データ記録制御手段を備えていることを特徴とする。
【０００９】
この発明は，ディジタル画像データの記録方法も提供している。すなわち，一駒の画像について単位画像データの画像データ量のｎ倍のデータ量を生成する固体電子撮像素子を用いて被写体を撮像して得られた被写体像を表わす精細画像データを得，上記撮像により得られる精細画像データのデータ量が上記単位画像データのデータ量と等しくなるように，上記精細画像データをｎ個の分割画像データに分割し，上記画像データ分割処理により得られた分割画像データによって表わされる分割画像が，上記精細画像のどこの部分に相当するのかを表わす識別データを得，上記画像データ分割処理により得られるｎ個の分割画像データを，記録媒体のｎ個の単位画像データ記録領域に記録し，上記識別データ発生処理によって発生する識別データを，ｎ個の上記分割画像データに関連付けて上記記録媒体の単位画像データ記録領域以外の補助領域に記録することを特徴とする。
【００１０】
上記のようにして画像データおよび識別データが記録媒体に記録されると，次のようにして再生される。再生する装置としては，一駒の画像について単位画像データの画像データ量のｎ倍のデータ量を生成する固体電子撮像素子を用いて被写体を撮像して得られた精細画像データから，データ量が上記単位画像データのデータ量と等しくなるように，上記精細画像データがｎ個の分割画像データに分割されたうえで記録媒体のｎ個の単位画像データ記録領域に記録され，かつ上記分割画像データによって表わされる分割画像が，上記精細画像のどこの部分に相当するのかを表わす識別データがｎ個の上記分割画像データに関連付けられている上記単位画像データ記録領域以外の補助領域に記録されている記録媒体からｎ個の上記分割画像データおよび識別データを読取る読取手段，動画再生モードと静止画再生モードとを選択的に設定するモード設定手段，上記モード設定手段により静止画再生モードが設定されたことに応じて上記読取手段によって読取られた識別データにもとづいて，ｎ個の上記分割画像データから精細画像を表わす上記精細画像データを復元して出力する精細画像データ復元手段，ならびに上記モード設定手段により動画再生モードが設定されたことに応じて上記読取手段によって読取られた識別データにもとづいて，上記精細画像のどこの部分に相当するのかを表わす識別符号を上記分割画像に表示するようにｎ個の上記分割画像データに識別符号データを挿入する識別符号データ挿入手段を備える。
【００１１】
再生方法としては，一駒の画像について単位画像データの画像データ量のｎ倍のデータ量を生成する固体電子撮像素子を用いて被写体を撮像して得られた精細画像データから，データ量が上記単位画像データのデータ量と等しくなるように，上記精細画像データがｎ個の分割画像データに分割されたうえで記録媒体のｎ個の単位画像データ記録領域に記録され，かつ上記分割画像データによって表わされる分割画像が，上記精細画像のどこの部分に相当するのかを表わす識別データがｎ個の上記分割画像データに関連付けられて上記単位画像データ記録領域以外の補助領域に記録されている記録媒体からｎ個の上記分割画像データおよび識別データを読取り，動画再生モードと静止画再生モードとを選択的に設定可能としておき，静止画再生モードが設定されたことに応じて上記読取処理によって読取られた識別データにもとづいて，ｎ個の上記分割画像データから精細画像を表わす上記精細画像データを復元して出力し，動画再生モードが設定されたことに応じて上記読取手段によって読取られた識別データにもとづいて，上記精細画像のどこの部分に相当するのかを表わす識別符号を上記分割画像に表示するようにｎ個の上記分割画像データに識別符号データを挿入する。
【００１２】
単位画像データは上述した現在の業界規格でいえば１フレーム画像データに相当する。
【００１３】
「単位画像データのデータ量と等しい」とは厳密に１バイト単位で等しい必要は必ずしもない。要するに，記録媒体の単位画像データ記録領域に記録可能なデータ量が規格で定められているので，この規格に合致するデータ量という意味に理解されたい。
【００１４】
この発明では単位画像データの画像データ量のｎ倍のデータ量の画像データを生成する固体電子撮像素子が用いられる。画素数の多い固体電子撮像素子が用いられているから，撮像の段階で高画質の画像の捕捉が行なわれる。
【００１５】
このようにして得られた高画質の画像を生じさせることのできる画像データを，既存の規格にしたがう記録方式と互換性を保ちながら，かつ画像データを損うことなく記録するために，この発明では，固体電子撮像素子から得られた画像データがｎ個の分割画像データに分割される。分割により得られたｎ個の分割画像データは，規格の記録方式にしたがって記録媒体に記録されることになる。
【００１６】
このようにして，撮像により得られた高画質の画像データの画質がそのまま保存され，かつ従来の規格に合致した形で記録されることになる。したがって，静止画モードが設定されると高画質の静止画の再生が可能となる。
【００１７】
動画再生モードが設定されるときには，上記精細画像のどこの部分に相当するのかを表わす識別符号が上記分割画像に表示される。分割画像であることがわかり，しかも精細画像のどこの部分を表わす分割画像を知ることができる。
【００１８】
上記静止画像を再生する装置を単独で構成してもよい。この場合再生する装置としては，一駒の画像について単位画像データの画像データ量のｎ倍のデータ量を生成する固体電子撮像素子を用いて被写体を撮像して得られた精細画像データから，データ量が上記単位画像データのデータ量と等しくなるように，上記精細画像データがｎ個の分割画像データに分割されたうえで記録媒体のｎ個の単位画像データ記録領域に記録され，かつ上記分割画像データによって表わされる分割画像が，上記精細画像のどこの部分に相当するのかを表わす識別データがｎ個の上記分割画像データに関連付けられて上記単位画像データ記録領域以外の補助領域に記録されている記録媒体からｎ個の上記分割画像データおよび識別データを読取る読取手段，ならびに上記読取手段によって読取られた識別データにもとづいて，ｎ個の上記分割画像データから精細画像を表わす上記精細画像データを復元して出力する精細画像データ復元手段を備える。
【００１９】
再生方法としては，一駒の画像について単位画像データの画像データ量のｎ倍のデータ量を生成する固体電子撮像素子を用いて被写体を撮像して得られた精細画像データから，データ量が上記単位画像データのデータ量と等しくなるように，上記精細画像データがｎ個の分割画像データに分割されたうえで記録媒体のｎ個の単位画像データ記録領域に記録され，かつ上記分割画像データによって表わされる分割画像が，上記精細画像のどこの部分に相当するのかを表わす識別データがｎ個の上記分割画像データに関連付けられて上記単位画像データ記録領域以外の補助領域に記録されている記録媒体からｎ個の上記分割画像データおよび識別データを読取り，上記読取処理によって読取られた識別データにもとづいて，ｎ個の上記分割画像データから精細画像を表わす上記精細画像データを復元して出力する。
【００２０】
画像データのデータ量は膨大となるので通常は画像データ分割処理により得られるｎ個の分割画像データはデータ圧縮して上記記録媒体のｎ個の単位画像データ記録領域に記録することとなろう。この場合，再生時には圧縮画像データをデータ伸張し精細画像を復元することとなろう。
【００２１】
上記記録時においては，上記撮像により得られる精細画像データによって表わされる精細画像の縮小画像を表わし，上記単位画像データのデータ量を有する縮小画像データを生成し，上記縮小画像データ生成処理により得られる縮小画像データを，ｎ個の上記分割画像データに関連付けて上記記録媒体の単位画像データ記録領域に記録してもよい。
【００２２】
これにより精細画像の縮小画像を得ることができ，精細画像を復元することなく，精細画像の様子を知ることができる。
【００２３】
画像に枠が形成されるようにｎ個の上記分割画像データおよび上記縮小画像データの少なくとも一方の一部の画像データを，枠を表わす画像データとしてもよい。
【００２４】
動画再生時には枠が表示されるので，その枠を見ただけで縮小画像または分割画像であることがわかる。
【００２５】
この場合には静止画再生時には，上記読取処理により読取られた識別データにもとづいてｎ個の分割画像データから上記精細画像データを復元した場合に，上記精細画像の内部に形成される枠を取除くように上記枠を表わす画像データの除去処理を行なうことが好ましい。
【００２６】
これにより精細画像の内部にある枠により画像が見づらくなるのを防止できる。
【００２７】
さらに記録時において，上記撮像により得られる精細画像データによって表わされる精細画像の縮小画像を表わし，上記単位画像データのデータ量を有する縮小画像データを生成し，上記分割画像の一部の領域に上記縮小画像が現われるように，上記画像データ分割処理により得られる分割画像データに，上記縮小画像データ生成処理によって生成された縮小画像データを挿入してもよい。
【００２８】
上記精細画像の縮小画像を表わし，上記単位画像データのデータ量を有する縮小画像データが上記単位記録領域に記録されているときには，上記分割画像の一部の領域に上記縮小画像が現われるように上記記録媒体から読取られた分割画像データに上記縮小画像データを挿入してもよい。
【００２９】
動画再生時には，分割画像中にその分割画像のもとの精細画像の縮小画像が表示されるので，一見して分割画像が精細画像のどこの部分かを知ることができる。
【００３０】
【実施例の説明】
ディジタル・ビデオ・テープ・レコーダの構成および動作の説明に先だち，ディジタル・ビデオ・テープ・レコーダによる磁気テープへの記録方式に関する既存の標準的な業界規格について説明しておく。
【００３１】
磁気テープの記録フォーマットが図６（Ａ）および（Ｂ）に示されている。図６（Ａ）は磁気テープ８のトラックＴｒを示すもので，磁気テープ８の長手方向に対して斜め方向に一定の角度で多数のトラックＴｒが形成される。これらの多数のトラックＴｒのうち連続する１０個のトラックを用いて１フレーム分のディジタル画像データが記録される。
【００３２】
図６（Ｂ）にトラック・フォーマットが示されている。１つのトラックＴｒには，サブコード記録領域，ビデオ記録領域，補助記録領域，オーディオ記録領域およびトラック情報記録領域が含まれている。サブコード記録領域には高速検索のためのタイムコードや絶対トラック番号などの情報が記録される。ビデオ記録領域には被写体像を表わすディジタル画像データが記録される。オーディオ記録領域には音を表わすデータが記録される。トラック情報記録領域には磁気ヘッドがトラックＴｒの中心をトレースするための，トラックＴｒの基準となる情報が記録される。補助記録領域は飛び飛びに設けられ，この補助記録領域には付加情報が記録される。各領域の間に設けられるギャップは図示が省略されている。
【００３３】
ディジタル・ビデオ・テープ・レコーダの撮像部に用いられるＣＣＤは一般的には（従来）水平ＣＣＤ転送クロック周波数１３．５ＭＨｚである，水平方向７２０画素，垂直方向４８０画素の約３５万画素の画素数をもつものが用いられる。このようなＣＣＤを用いて得られた１フレーム分のディジタル画像データが，磁気テープ８の１０トラックに記録される。これが既存の規格である。
【００３４】
磁気テープ８に記録される画像データによって表わされる画像の画質を向上させるためには，画素数の多いＣＣＤを用いれば良い。しかしながら，ディジタル・ビデオ・テープ・レコーダにおいては水平７２０画素，垂直４８０画素の約３５万画素のディジタル画像データを，１０個のトラックに記録するようにその規格が定められているので，３５万画素の画素数よりも画素数の多いＣＣＤを用いて被写体を撮像して得られたディジタル画像データを磁気テープ８に記録すると，この規格から外れてしまう。この発明によるディジタル・ビデオ・テープ・レコーダは，ディジタル・ビデオ・テープ・レコーダに一般的に用いられる３５万画素の画素数よりも多い画素数をもつＣＣＤを用いて被写体を撮像し，かつディジタル・ビデオ・テープ・レコーダの従来からの記録規格に合致した画像データの記録を可能とするものである。
【００３５】
図１はこの発明の実施例を示すもので，ディジタル画像データの記録および再生が可能なディジタル・ビデオ・テープ・レコーダ（ＤＶＴＲ）の電気的構成を示すブロック図である。ディジタル・ビデオ・テープ・レコーダの全体の動作はシステム・コントローラ１０によって統括される。
【００３６】
このディジタル・ビデオ・テープ・レコーダの撮像部で用いられるＣＣＤ１１は，図２に示されているように水平方向１４４０画素，垂直方向９６０画素の約１４０万画素の画素数をもつものであり，３５万画素ＣＣＤの４倍の量の画像データが得られる。このような１４０万画素ＣＣＤ１１から得られる１フレーム分の画像データのデータ量は，３５万画素ＣＣＤの４フレーム分の画像データのデータ量に相当する。
【００３７】
この実施例のディジタル・ビデオ・テープ・レコーダではＣＣＤ１１から得られる１駒分の画像データを４フレーム分の画像データに分け，各１フレーム分をそれぞれ１０トラックずつを用いて磁気テープ８に記録することにより，高画質撮影を達成しつつ，ディジタル・ビデオ・テープ・レコーダの従来からの記録規格に合致した画像データの記録を可能とする。
【００３８】
記録モードにおいて，約１４０万画素の画素数をもつＣＣＤ１１によって１／７．５秒の一定周期で被写体が連続的に撮影される。撮影のためのシャッタ速度が適当（たとえば１／６０秒，または必要に応じてこれよりも短い時間）になるように，いわゆる電子シャッタ制御により定められる。
【００３９】
ＣＣＤ１１から１／７．５秒ごとに被写体像を表わす映像信号が出力され，アナログ／ディジタル変換回路１２に与えられる。映像信号はアナログ／ディジタル変換回路１２においてディジタル画像データに変換され，ＤＳＰ（ＤｉｓｉｔａｌＳｉｇｎａｌＰｒｏｃｅｓｓｏｒ）１３に与えられる。
【００４０】
ＤＳＰ１３において，入力する水平方向１４４０画素垂直方向９６０画素の約１４０万画素のディジタル画像データから図３（ａ）に示すように水平方向７２０画素垂直方向４８０画素の縮小画像を表わす画像データが生成される。縮小画像データの生成は水平方向および垂直方向ともに１／２の画素となるように間引処理を行なえばよい。ＤＳＰ１３においては縮小画像の生成に加えて分割画像も生成される。分割画像の生成は図２に示すように水平方向１４４０画素垂直方向９６０画素の約１４０万画素の精細画像を，左上の領域ａ_１，右上の領域ａ_２，左下の領域ａ_３および右下の領域ａ_４に分割することにより行なわれる（図３（ｂ）〜（ｅ））。分割画像ａ_１〜ａ_４も水平方向７２０画素垂直方向４８０画素の約３５万画素の画像となる。
【００４１】
ＤＳＰ１３において縮小画像および分割画像が生成されると，図４（ａ）〜（ｅ）に示すように縮小画像および分割画像の枠（ハッチングで示す）が形成される。縮小画像であれば図４（ａ）に示すように縮小画像の周辺部に枠が形成される。分割画像の場合は単純に分割画像の周辺部に枠を形成すると精細画像の中央部分が消去されてしまうことがある。このため分割画像においては図４（ｂ）〜（ｅ）に示すように精細画像の中央部分が常に残るように枠が形成される。分割画像における枠の形成はアドレッシングの操作により容易に実現することができる。このようにして図５（ａ）〜（ｅ）に示すように縮小画像および分割画像に枠が形成される。
【００４２】
枠が形成された縮小画像および分割画像を表わす画像データはＤＳＰ１３からメモリ１４に与えられ一旦記憶される。メモリ１４は約３５万画素の画像データを５駒分記憶できる容量をもつ。
【００４３】
メモリ１４に記憶された画像データは順に読出されＤＳＰ１３を通過してデータ並べ替え回路１５に与えられる。データ並べ替え回路１５において，ＤＶＴＲの記録フォーマットにしたがうように画像データのシャフリングが行なわれる。データ並べ替え回路１５においてシャフリングされた画像データはデータ圧縮回路１６に与えられる。
【００４４】
データ圧縮回路１６においてＤＣＴ（ＤｉｓｃｒｅｔｅＣｏｓｉｎｅＴｒａｎｓｆｏｒｍ）処理，量子化処理などが行なわれることにより，画像データにデータ圧縮が施される。データ圧縮処理回路１６において圧縮された画像データは順次誤り訂正符号付加回路１７に与えられ，誤り訂正符号が付加される。誤り訂正符号付加回路１７にはシステム・コントローラ１０から補助領域データも与えられている。この補助領域データは，画像データが縮小画像データであること，分割画像データであること，精細画像のどこの部分を構成する分割画像であるかを示す識別データであり，縮小画像データおよび分割画像データのそれぞれに付加される。
【００４５】
誤り訂正符号付加回路１７から出力される画像データは変調回路１８に与えられ，符号化（たとえばＮＲＺＩ符号化）されて記録再生増幅回路１９に与えられる。記録再生増幅回路１９において増幅された画像データは磁気ヘッド２０に与えられる。これにより磁気ヘッド２０によって磁気テープ８の各トラックのうちビデオ記録領域Ａ_２に画像データが記録され，補助記録領域Ａ_３に補助領域データが記録される。オーディオ・データやトラック情報の記録ももちろん行なわれる。
【００４６】
縮小画像データおよび４つの分割画像データの総データ量は，一般的に用いられる３５万画素のＣＣＤを用いて被写体を撮影して得られた１フレーム分の画像データのデータ量の５倍に相当するから５０トラックを用いて磁気トラック８に記録される。
【００４７】
図１に示すディジタル・ビデオ・テープ・レコーダは，磁気テープ８に記録されたディジタル画像データの再生も可能である。
【００４８】
再生モードには静止画再生モードと動画再生モードとがあり，静止画再生モードおよび動画再生モードを設定するためのモード設定スイッチ５１および５２が設けられている。モード設定スイッチ５１および５２において設定された信号はシステム・コントローラ１０に与えられる。
【００４９】
静止画再生モードおよび動画再生モードのいずれにおいても磁気テープ８に記録された画像データ，補助領域データ，その他のデータが磁気ヘッド３１によって読取られ記録再生増幅回路１９に与えられる。記録再生増幅回路１９において増幅されたデータは復調回路３２に与えられる。復調回路３２においてデータ復調が行なわれ，誤り訂正回路３３に与えられる。復調回路３２において復調されたデータにデータ誤りがあると，誤り訂正回路３３において誤り訂正処理が行なわれる。誤り訂正処理が行なわれたデータのうち被写体像を表わすディジタル画像データはデータ伸長回路３４に与えられ，補助領域データはシステム・コントローラ１０に与えられる。
【００５０】
画像データはデータ伸長回路３４において圧縮された画像データのデータ伸長処理が行なわれる。データ伸長回路３４においてデータ伸長されたディジタル画像データはデータ並べ替え回路３５に与えられる。データ並べ替え回路３５においてディジタル・ビデオ・テープ・レコーダの記録フォーマットにしたがった画像データの配列からもとの画像データの配列に戻される（デシャフリング）。
【００５１】
動画再生モード設定スイッチ５２により動画再生モードが設定されているときにはデータ並べ替え回路３５から出力される画像データはモニタ表示装置４２に与えられる。これによりモニタ表示装置４２には図５（ａ）〜（ｅ）に示すように画像の周辺に枠が形成された縮小画像および分割画像が順次表示される。モニタ表示装置４２に表示される画像には枠が形成されているので縮小画像であることおよび分割画像であることを知ることができる。また動画再生においてモニタ表示装置４２に表示される縮小画像および分割画像に縮小画像である旨，分割画像である旨および精細画像のどこの部分を表わす分割画像であるかを示す旨を表示するようにしてもよい。この場合には，システム・コトローラ１０に与えられる補助領域データを利用することとなろう。
【００５２】
静止画再生モード設定スイッチ５１により静止画再生モードが設定されているときにはデータ並べ替え回路３５から出力される画像データは画像合成回路３６に与えられる。画像合成回路３６において図５（ａ）〜（ｅ）の各画像の枠が除去される処理が行なわれ，まず図３（ａ）〜（ｅ）に示す画像が復元される。画像が復元されると補助領域データにもとづいて図３（ｂ）〜（ｅ）に示す分割画像が合成され図２に示すもとの精細画像が復元される。この精細画像を表わす画像データは画像合成回路３６からプリンタ４１に与えられ，図２に示す精細画像がプリントされる。
【００５３】
図７は他の実施例を示すもので，ディジタル・ビデオ・テープ・レコーダの電気的構成を示すブロック図である。この図において図１に示すものと同一物には同一符号を付して説明を省略する。
【００５４】
図１に示すディジタル・ビデオ・テープ・レコーダは動画再生モードにおいては図５（ａ）〜（ｅ）に示すようにモニタ表示装置４２に縮小画像につづいて分割画像が表示されるのに対し，図７に示すディジタル・ビデオ・テープ・レコーダは動画再生モードにおいては図８（ａ）〜（ｄ）に示すように分割画像の一部の領域に縮小画像が表示されるものである。図７に示すディジタル・ビデオ・テープ・レコーダにおいて記録時の処理および再生時の静止画再生モードにおける処理は図１に示すディジタル・ビデオ・テープ・レコーダと同じであるため，動画再生モードが設定された場合について説明する。
【００５５】
動画再生モードが設定されると，データ並べ替え回路３５から出力される縮小画像データおよび分割画像データはＤＳＰ１３Ａに与えられる。ＤＳＰ１３Ａにおいて，図８（ａ）〜（ｄ）に示すように分割画像の一部の領域にウィンドウＷが設定される。縮小画像はさらに縮小され，ウィンドウＷに縮小画像が組込まれる。縮小画像がウィンドウＷに組込まれた分割画像を表わす画像データは，ＤＳＰ１３Ａからモニタ表示装置４２に与えられる。これによりモニタ表示装置４２には図８（ａ）〜（ｄ）に示すようにウィンドウＷに縮小画像が表示された分割画像が表示される。ウィンドウＷに表示される縮小画像においては，分割画像が精細画像のどこの部分に相当するかが分るように破線で領域を示すようにＤＳＰ１３Ａにおいて画像データの処理を行なうとよい。
【００５６】
また図８（ａ）〜（ｄ）に示すように，分割画像に縮小画像を挿入する処理を動画再生時に行なうだけでなく，記録時にＤＳＰ１３Ａにおいて行なってもよい。その場合には静止画再生モードにおいて精細画像を復元できるように精細画像データを記録する必要があろう。
【００５７】
上記においては，一般的なＣＣＤの画素数の４倍の画素数をもつＣＣＤを用いて１／７．５秒周期で被写体を撮像して１駒分の画像データを得て，これを４フレームに分割して磁気テープに記録しているが，一般的なＣＣＤの画素数の４倍の画素数をもつＣＣＤのみならず任意の整数ｎ倍の画素数をもつＣＣＤを用いて１駒分の画像データを得るようにしても良い。この場合は撮影に用いられるＣＣＤの画素数に応じて，分割されて磁気テープに記録されることになる。
【００５８】
また上記においては各回路はハードウェアにより構成されているが，ハードウェア回路の一部を，ソフトウェアによって実現することもできる。
【図面の簡単な説明】
【図１】ディジタル・ビデオ・テープ・レコーダの電気的構成を示すブロック図である。
【図２】ＣＣＤの構成を示している。
【図３】（ａ）は縮小画像を，（ｂ）〜（ｅ）は分割画像を示している。
【図４】（ａ）〜（ｅ）は縮小画像および分割画像に枠を形成する処理を示している。
【図５】（ａ）〜（ｅ）は枠が形成された縮小画像および分割画像を示している。
【図６】（Ａ）は磁気テープの記録フォーマットを示しており，（Ｂ）はトラック・フォーマットを示している。
【図７】他の実施例を示すものでディジタル・ビデオ・テープ・レコーダの電気的構成を示すブロック図である。
【図８】（ａ）〜（ｄ）は縮小画像が一部に組込まれた分割画像を示している。
【符号の説明】
８磁気テープ
１０システム・コントローラ
１３，１３ＡＤＳＰ
３６画像合成回路[0001]
【Technical field】
The present invention relates to a digital image data recording apparatus and method for recording unit image data having a predetermined amount of data in a unit image data recording area of a recording medium, such as a digital video tape recorder, and the recording method thus recorded. The present invention relates to an apparatus and a method for reproducing image data from a recording medium.
[0002]
BACKGROUND OF THE INVENTION
A digital video tape recorder (DVTR) captures a subject using a solid-state electronic image sensor such as a CCD, converts a video signal representing the subject image obtained by the imaging into digital image data, and applies it to a magnetic tape. To record. The CCD used in the image pickup unit of a digital video tape recorder is generally 720 pixels in the horizontal direction × 480 pixels in the vertical direction = approximately 350,000 pixels. In the digital video tape recorder, frame recording for recording one frame by two fields and recording a frame image and field recording for recording a field image for each field are possible. In the case of frame recording, shooting is continuously performed at a predetermined shutter speed with a period of 1/30 seconds, and in the case of field recording, shooting is continuously performed at a predetermined shutter speed with a period of 1/60 seconds. In both frame recording and field recording, image data for one frame is recorded on the magnetic tape using a recording area of 10 tracks over a time period of 1/30 seconds.
[0003]
As described above, in a digital video tape recorder, one frame of image data is recorded on 10 tracks over 1/30 second of digital image data obtained by photographing a subject using a CCD with 350,000 pixels. This recording method has become a standard in the industry (for example, NIKKEI ELECTRONICS BOOKS “Data Compression and Digital Modulation”, pages 137-152, Nikkei Business Publications, 1993 reference).
[0004]
On the other hand, the image quality in the image pickup section of a digital video tape recorder depends on the number of CCD pixels, and improves as the number of CCD pixels increases. However, in order to improve the image quality, a CCD with a large number of pixels is used, and image data obtained from this CCD is recorded on a magnetic tape. Space is required and the digital video tape recorder does not meet the above-mentioned standard.
[0005]
To record image data obtained by imaging a subject using a CCD with a large number of pixels on a recording medium while maintaining compatibility with existing recording standards, the obtained image data is an image for one frame. What is necessary is just to divide and record to data amount.
[0006]
However, if the image data is simply divided and the divided image data is recorded on a magnetic tape so that the amount of image data obtained from the CCD having a large number of pixels is equal to the amount of image data for one frame, the reproduced divided image is reproduced. You may not know what the segmented image represented by the data represents. An operator who is viewing a replayed image may think that the device has failed.
[0007]
DISCLOSURE OF THE INVENTION
In order to obtain high-quality still images while maintaining compatibility with existing standards such as recording standards for digital video tape recorders, the present invention obtains image data with a large amount of data by imaging, An object of the present invention is to recognize at the time of reproduction that an image is represented by divided image data when the image data is divided and recorded on a recording medium.
[0008]
A digital image data recording apparatus according to the present invention includes a solid-state electronic image sensor that generates a data amount n times the image data amount of unit image data for one frame image, and images a subject using the solid-state electronic image sensor. Imaging means for outputting fine image data representing the obtained subject image, and n pieces of fine image data so that the amount of fine image data output from the image pickup means is equal to the data amount of the unit image data An image data dividing means for dividing the image into divided image data, and an identification data for generating identification data representing a portion of the fine image corresponding to the divided image represented by the divided image data obtained by the image data dividing means The n divided image data output from the data generating means and the image data dividing means are converted into n unit image data on the recording medium. The divided image data recording control means for recording in the data recording area and the identification data generated by the identification data generating means are associated with the n pieces of divided image data in the auxiliary area other than the unit image data recording area of the recording medium. An identification data recording control means for recording is provided.
[0009]
The present invention also provides a method for recording digital image data. That is, fine image data representing a subject image obtained by imaging a subject using a solid-state electronic imaging device that generates a data amount of n times the image data amount of unit image data for one frame image is obtained by the above imaging. The fine image data is divided into n pieces of divided image data so that the data amount of the fine image data obtained is equal to the data amount of the unit image data, and the divided image data obtained by the image data division process is used. Identification data representing which part of the fine image the divided image to be represented is obtained, and n pieces of divided image data obtained by the image data division processing are recorded on n unit image data on a recording medium. The identification data recorded in the area and generated by the identification data generation process is associated with the n pieces of divided image data and the recording medium is simply recorded. Characterized by recording in the auxiliary area other than the image data recording area.
[0010]
When the image data and the identification data are recorded on the recording medium as described above, they are reproduced as follows. As an apparatus for reproduction, the amount of data is determined from fine image data obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount n times the image data amount of unit image data for one frame image. The fine image data is divided into n divided image data so as to be equal to the data amount of the unit image data, and then recorded in n unit image data recording areas of the recording medium. A record in which identification data indicating which part of the fine image the divided image to be represented is recorded in an auxiliary area other than the unit image data recording area associated with the n pieces of divided image data Reading means for reading n pieces of divided image data and identification data from a medium, and a mode for selectively setting a moving image reproduction mode and a still image reproduction mode The fine image data representing the fine image from the n divided image data based on the identification data read by the reading means in response to the setting of the still image reproduction mode by the setting means and the mode setting means. Corresponding to any part of the fine image based on the identification data read by the reading means in response to the setting of the moving image reproduction mode by the mode setting means and the fine image data restoring means to be restored and output Identification code data insertion means for inserting identification code data into the n pieces of divided image data so as to display an identification code indicating whether or not to be performed on the divided images.
[0011]
As a reproduction method, the amount of data is obtained from fine image data obtained by imaging a subject using a solid-state electronic image pickup device that generates a data amount n times the image data amount of unit image data for one frame image. The fine image data is divided into n divided image data so as to be equal to the data amount of the image data, and then recorded in n unit image data recording areas of the recording medium, and is represented by the divided image data. From the recording medium in which the identification data indicating which portion of the fine image corresponds to the divided image to be recorded is associated with the n pieces of divided image data and recorded in the auxiliary area other than the unit image data recording area Read the n pieces of divided image data and identification data, make it possible to selectively set the video playback mode and still image playback mode, and still image playback The fine image data representing the fine image is restored from the n pieces of divided image data based on the identification data read by the reading process in response to the setting of the mode, and the moving image reproduction mode is set. Based on the identification data read by the reading means in accordance with the setting, the n divided images are displayed so that an identification code indicating which portion of the fine image corresponds to the divided image. The identification code data is inserted into the data.
[0012]
The unit image data corresponds to one frame image data in the current industry standard described above.
[0013]
“Equal to the amount of unit image data” does not necessarily have to be exactly equal in units of 1 byte. In short, the amount of data that can be recorded in the unit image data recording area of the recording medium is determined by the standard, so it should be understood that the amount of data conforms to this standard.
[0014]
In the present invention, a solid-state electronic image sensor that generates image data having a data amount n times the image data amount of unit image data is used. Since a solid-state electronic image sensor having a large number of pixels is used, a high-quality image is captured at the stage of imaging.
[0015]
In order to record image data capable of producing a high-quality image obtained in this way while maintaining compatibility with a recording method according to an existing standard and without damaging the image data, the present invention Then, the image data obtained from the solid-state electronic image sensor is divided into n pieces of divided image data. The n divided image data obtained by the division is recorded on a recording medium in accordance with a standard recording method.
[0016]
In this way, the image quality of high-quality image data obtained by imaging is stored as it is and recorded in a form that conforms to the conventional standard. Accordingly, when the still image mode is set, it is possible to reproduce a high-quality still image.
[0017]
When the moving image reproduction mode is set, an identification code indicating which portion of the fine image corresponds to the divided image is displayed. It can be seen that the image is a divided image, and the divided image representing any part of the fine image can be known.
[0018]
The apparatus for reproducing the still image may be configured independently. In this case, as a reproducing apparatus, a data amount is obtained from fine image data obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount n times the image data amount of unit image data for one frame image. The fine image data is divided into n divided image data so as to be equal to the data amount of the unit image data, and is recorded in n unit image data recording areas of a recording medium, and the divided image is recorded. Identification data indicating where the divided image represented by the data corresponds to which part of the fine image is associated with the n pieces of divided image data and recorded in an auxiliary area other than the unit image data recording area. Based on reading means for reading n pieces of divided image data and identification data from a recording medium, and identification data read by the reading means There are provided a definition image data restoration means for outputting to restore the above definition image data representing the fine image of n the divided image data.
[0019]
As a reproduction method, the amount of data is obtained from fine image data obtained by imaging a subject using a solid-state electronic image pickup device that generates a data amount n times the image data amount of unit image data for one frame image. The fine image data is divided into n divided image data so as to be equal to the data amount of the image data, and then recorded in n unit image data recording areas of the recording medium, and is represented by the divided image data. From the recording medium in which the identification data indicating which portion of the fine image corresponds to the divided image to be recorded is associated with the n pieces of divided image data and recorded in the auxiliary area other than the unit image data recording area n pieces of the divided image data and identification data are read, and n pieces of the divided image data are read based on the identification data read by the reading process. And outputs the restored the definition image data representing the fine image from data.
[0020]
Since the data amount of image data becomes enormous, normally, n divided image data obtained by image data division processing will be compressed and recorded in n unit image data recording areas of the recording medium. In this case, at the time of reproduction, the compressed image data will be decompressed to restore a fine image.
[0021]
At the time of the recording, a reduced image of the fine image represented by the fine image data obtained by the imaging is represented, reduced image data having a data amount of the unit image data is generated, and obtained by the reduced image data generation process. The reduced image data may be recorded in the unit image data recording area of the recording medium in association with the n pieces of divided image data.
[0022]
Thereby, a reduced image of the fine image can be obtained, and the state of the fine image can be known without restoring the fine image.
[0023]
Image data representing at least one of the n pieces of divided image data and the reduced image data may be image data representing a frame so that a frame is formed in the image.
[0024]
Since a frame is displayed during moving image reproduction, it can be seen that the image is a reduced image or a divided image just by looking at the frame.
[0025]
In this case, when reproducing the still image, the frame formed inside the fine image is removed when the fine image data is restored from the n pieces of divided image data based on the identification data read by the reading process. It is preferable to remove the image data representing the frame so as to exclude it.
[0026]
This prevents the image from becoming difficult to see due to the frame inside the fine image.
[0027]
Further, at the time of recording, a reduced image of the fine image represented by the fine image data obtained by the imaging is represented, reduced image data having a data amount of the unit image data is generated, and the partial image of the divided image has the portion The reduced image data generated by the reduced image data generation process may be inserted into the divided image data obtained by the image data division process so that the reduced image appears.
[0028]
When the reduced image data representing the reduced image of the fine image and having the data amount of the unit image data is recorded in the unit recording area, the reduced image appears in a partial area of the divided image. The reduced image data may be inserted into the divided image data read from the recording medium.
[0029]
When a moving image is reproduced, a reduced image of the fine image that is the original of the divided image is displayed in the divided image, so that it can be seen at a glance where the divided image is in the fine image.
[0030]
[Explanation of Examples]
Prior to the description of the configuration and operation of the digital video tape recorder, an existing standard industry standard concerning the recording method on the magnetic tape by the digital video tape recorder will be described.
[0031]
The recording format of the magnetic tape is shown in FIGS. 6 (A) and 6 (B). FIG. 6A shows tracks Tr of the magnetic tape 8, and a large number of tracks Tr are formed at a constant angle in an oblique direction with respect to the longitudinal direction of the magnetic tape 8. One frame of digital image data is recorded using 10 consecutive tracks among these many tracks Tr.
[0032]
FIG. 6B shows the track format. One track Tr includes a subcode recording area, a video recording area, an auxiliary recording area, an audio recording area, and a track information recording area. Information such as a time code and an absolute track number for high-speed search is recorded in the subcode recording area. Digital image data representing a subject image is recorded in the video recording area. Data representing sound is recorded in the audio recording area. In the track information recording area, information serving as a reference for the track Tr for the magnetic head to trace the center of the track Tr is recorded. The auxiliary recording area is provided in a skipped manner, and additional information is recorded in this auxiliary recording area. The gap provided between the regions is not shown.
[0033]
The CCD used in the image pickup unit of a digital video tape recorder is generally (conventional) a horizontal CCD transfer clock frequency of 13.5 MHz, the number of pixels of about 350,000 pixels of 720 pixels horizontally and 480 pixels vertically. The one with is used. One frame of digital image data obtained using such a CCD is recorded on 10 tracks of the magnetic tape 8. This is an existing standard.
[0034]
In order to improve the image quality of the image represented by the image data recorded on the magnetic tape 8, a CCD having a large number of pixels may be used. However, in the digital video tape recorder, the standard is determined so that about 350,000 pixels of digital image data of 720 pixels horizontally and 480 pixels vertically are recorded on 10 tracks. If digital image data obtained by imaging a subject using a CCD having a larger number of pixels than the number of pixels is recorded on the magnetic tape 8, it will be out of this standard. The digital video tape recorder according to the present invention images a subject using a CCD having a pixel number larger than the 350,000 pixel number generally used for a digital video tape recorder, It is possible to record image data that conforms to the conventional recording standard of video tape recorders.
[0035]
FIG. 1 shows an embodiment of the present invention and is a block diagram showing an electrical configuration of a digital video tape recorder (DVTR) capable of recording and reproducing digital image data. The overall operation of the digital video tape recorder is controlled by the system controller 10.
[0036]
As shown in FIG. 2, the CCD 11 used in the image pickup unit of this digital video tape recorder has a number of pixels of about 1.4 million pixels of 1440 pixels in the horizontal direction and 960 pixels in the vertical direction. Four times as much image data as a 10,000 pixel CCD can be obtained. The data amount of image data for one frame obtained from the 1.4 million pixel CCD 11 corresponds to the data amount of image data for four frames of 350,000 pixel CCD.
[0037]
In the digital video tape recorder of this embodiment, one frame of image data obtained from the CCD 11 is divided into four frames of image data, and each frame is recorded on the magnetic tape 8 using 10 tracks each. This makes it possible to record image data that conforms to the conventional recording standards of digital video tape recorders while achieving high-quality shooting.
[0038]
In the recording mode, the subject is continuously photographed at a constant cycle of 1 / 7.5 seconds by the CCD 11 having about 1.4 million pixels. It is determined by so-called electronic shutter control so that the shutter speed for photographing becomes appropriate (for example, 1/60 seconds, or shorter time if necessary).
[0039]
A video signal representing a subject image is output from the CCD 11 every 1 / 7.5 seconds and is provided to the analog / digital conversion circuit 12. The video signal is converted into digital image data by an analog / digital conversion circuit 12 and is supplied to a DSP (Digital Signal Processor) 13.
[0040]
In the DSP 13, image data representing a reduced image of 720 pixels in the horizontal direction and 480 pixels in the vertical direction is generated from the digital image data of about 1,400,000 pixels in the horizontal direction of 1440 pixels and 960 pixels in the vertical direction as shown in FIG. The The reduced image data may be generated by performing a thinning process so that the number of pixels becomes 1/2 in both the horizontal direction and the vertical direction. In the DSP 13, in addition to the generation of the reduced image, a divided image is also generated. As shown in FIG. 2, the divided image is generated by dividing a fine image of about 1.4 million pixels of 1440 pixels in the horizontal direction and 960 pixels in the vertical direction into the area a ₁ , Upper right area a ₂ , Lower left area a ₃ And lower right area a ₄ (FIGS. 3B to 3E). Split image a ₁ ~ A ₄ Also, an image of about 350,000 pixels of 720 pixels in the horizontal direction and 480 pixels in the vertical direction is obtained.
[0041]
When the reduced image and the divided image are generated in the DSP 13, a frame (shown by hatching) of the reduced image and the divided image is formed as shown in FIGS. 4 (a) to 4 (e). If the image is a reduced image, a frame is formed around the reduced image as shown in FIG. In the case of a divided image, if the frame is simply formed around the divided image, the central portion of the fine image may be erased. For this reason, in the divided image, a frame is formed so that the central portion of the fine image always remains as shown in FIGS. Formation of a frame in the divided image can be easily realized by an addressing operation. In this way, frames are formed on the reduced image and the divided image as shown in FIGS.
[0042]
Image data representing the reduced image and the divided image in which the frame is formed is given from the DSP 13 to the memory 14 and temporarily stored. The memory 14 has a capacity capable of storing image data of about 350,000 pixels for five frames.
[0043]
The image data stored in the memory 14 is read in order, passes through the DSP 13 and is given to the data rearrangement circuit 15. The data rearrangement circuit 15 shuffles the image data so as to follow the DVTR recording format. The image data shuffled in the data rearrangement circuit 15 is given to the data compression circuit 16.
[0044]
Data compression is performed on the image data by performing DCT (Discrete Cosine Transform) processing, quantization processing, and the like in the data compression circuit 16. The image data compressed in the data compression processing circuit 16 is sequentially given to an error correction code adding circuit 17 and an error correction code is added. The error correction code adding circuit 17 is also supplied with auxiliary area data from the system controller 10. The auxiliary area data is identification data indicating whether the image data is reduced image data, divided image data, and which part of the fine image is a divided image. Appended to each of the data.
[0045]
The image data output from the error correction code adding circuit 17 is supplied to the modulation circuit 18, encoded (for example, NRZI encoding), and supplied to the recording / reproducing amplifier circuit 19. The image data amplified in the recording / reproducing amplifier circuit 19 is given to the magnetic head 20. Thereby, the video recording area A of each track of the magnetic tape 8 is recorded by the magnetic head 20. ₂ Image data is recorded in the auxiliary recording area A ₃ Auxiliary area data is recorded in Of course, audio data and track information are recorded.
[0046]
The total data amount of the reduced image data and the four divided image data is equivalent to five times the data amount of one frame of image data obtained by photographing a subject using a commonly used 350,000 pixel CCD. Therefore, 50 tracks are recorded on the magnetic track 8.
[0047]
The digital video tape recorder shown in FIG. 1 can also reproduce digital image data recorded on the magnetic tape 8.
[0048]
The reproduction modes include a still image reproduction mode and a moving image reproduction mode, and mode setting switches 51 and 52 for setting the still image reproduction mode and the moving image reproduction mode are provided. The signals set by the mode setting switches 51 and 52 are given to the system controller 10.
[0049]
In both the still image reproduction mode and the moving image reproduction mode, image data, auxiliary area data, and other data recorded on the magnetic tape 8 are read by the magnetic head 31 and applied to the recording / reproducing amplifier circuit 19. The data amplified in the recording / reproducing amplifier circuit 19 is supplied to the demodulation circuit 32. Data demodulation is performed in the demodulation circuit 32 and is supplied to the error correction circuit 33. If there is a data error in the data demodulated by the demodulation circuit 32, the error correction circuit 33 performs error correction processing. Of the data that has been subjected to error correction processing, digital image data representing the subject image is applied to the data decompression circuit 34, and auxiliary area data is applied to the system controller 10.
[0050]
The image data is subjected to data expansion processing of the image data compressed in the data expansion circuit 34. The digital image data decompressed by the data decompression circuit 34 is supplied to the data rearrangement circuit 35. In the data rearrangement circuit 35, the arrangement of the image data according to the recording format of the digital video tape recorder is restored to the original arrangement of the image data (deshuffling).
[0051]
When the moving image reproduction mode is set by the moving image reproduction mode setting switch 52, the image data output from the data rearrangement circuit 35 is given to the monitor display device. As a result, as shown in FIGS. 5A to 5E, the monitor display device 42 sequentially displays a reduced image and a divided image in which a frame is formed around the image. Since an image displayed on the monitor display device 42 is formed with a frame, it can be known that the image is a reduced image and a divided image. In addition, the reduced image and the divided image displayed on the monitor display device 42 in the moving image reproduction display that the image is a reduced image, the fact that it is a divided image, and the portion indicating the portion of the fine image. It may be. In this case, auxiliary area data given to the system controller 10 will be used.
[0052]
When the still image reproduction mode is set by the still image reproduction mode setting switch 51, the image data output from the data rearrangement circuit 35 is given to the image composition circuit 36. The image composition circuit 36 performs processing for removing the frame of each image shown in FIGS. 5A to 5E. First, the images shown in FIGS. 3A to 3E are restored. When the image is restored, the divided images shown in FIGS. 3B to 3E are synthesized based on the auxiliary area data, and the original fine image shown in FIG. 2 is restored. The image data representing the fine image is supplied from the image composition circuit 36 to the printer 41, and the fine image shown in FIG. 2 is printed.
[0053]
FIG. 7 shows another embodiment and is a block diagram showing an electrical configuration of a digital video tape recorder. In this figure, the same components as those shown in FIG.
[0054]
In the video playback mode, the digital video tape recorder shown in FIG. 1 displays a divided image on the monitor display device 42 as shown in FIGS. 5 (a) to 5 (e). The digital video tape recorder shown in FIG. 7 displays a reduced image in a partial area of the divided image as shown in FIGS. 8A to 8D in the moving image reproduction mode. In the digital video tape recorder shown in FIG. 7, the processing at the time of recording and the processing in the still picture playback mode at the time of playback are the same as those of the digital video tape recorder shown in FIG. The case will be described.
[0055]
When the moving image reproduction mode is set, the reduced image data and the divided image data output from the data rearrangement circuit 35 are given to the DSP 13A. In the DSP 13A, as shown in FIGS. 8A to 8D, a window W is set in a partial area of the divided image. The reduced image is further reduced, and the reduced image is incorporated into the window W. Image data representing the divided image in which the reduced image is incorporated in the window W is given from the DSP 13A to the monitor display device 42. As a result, the monitor display device 42 displays the divided image in which the reduced image is displayed in the window W as shown in FIGS. In the reduced image displayed in the window W, it is preferable to process the image data in the DSP 13A so as to indicate the region with a broken line so that it can be understood where the divided image corresponds to the fine image.
[0056]
Further, as shown in FIGS. 8A to 8D, the process of inserting the reduced image into the divided image may be performed not only at the time of moving image reproduction but also at the DSP 13A at the time of recording. In that case, it will be necessary to record the fine image data so that the fine image can be restored in the still image reproduction mode.
[0057]
In the above, using a CCD having four times the number of pixels of a general CCD, the subject is imaged at a period of 1 / 7.5 second to obtain one frame of image data, and this is converted into four frames. Is recorded on a magnetic tape, but not only a CCD having four times the number of pixels of a general CCD but also a CCD having an arbitrary number of pixels n times an integral number of pixels. Image data may be obtained. In this case, the image is divided and recorded on the magnetic tape according to the number of pixels of the CCD used for photographing.
[0058]
In the above description, each circuit is configured by hardware, but a part of the hardware circuit can be realized by software.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an electrical configuration of a digital video tape recorder.
FIG. 2 shows a configuration of a CCD.
3A is a reduced image, and FIGS. 3B to 3E are divided images. FIG.
FIGS. 4A to 4E show processing for forming a frame in a reduced image and a divided image.
FIGS. 5A to 5E show a reduced image and a divided image in which a frame is formed. FIG.
6A shows a recording format of a magnetic tape, and FIG. 6B shows a track format.
FIG. 7 is a block diagram showing an electrical configuration of a digital video tape recorder according to another embodiment.
FIGS. 8A to 8D show divided images in which reduced images are partially incorporated.
[Explanation of symbols]
8 Magnetic tape
10 System controller
13,13A DSP
36 Image composition circuit

Claims

It is obtained by imaging a subject using the solid-state electronic image sensor, including a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the image data amount of unit image data for one frame image. Imaging means for outputting fine image data representing a subject image,
Image data dividing means for dividing the fine image data into n pieces of divided image data so that the data amount of the fine image data output from the imaging means is equal to the data amount of the unit image data;
Identification data generating means for generating identification data indicating which part of the fine image the divided image represented by the divided image data obtained by the image data dividing means is;
Image data processing means for replacing part of the n pieces of image data with image data representing a frame so that a frame is formed in the image;
Divided image data recording control means for recording n divided image data in which part of the image data is replaced by image data representing a frame by the image data processing means in n unit image data recording areas of the recording medium; And identification data recording means for recording the identification data generated by the identification data generating means in an auxiliary area other than the unit image data recording area of the recording medium in association with n pieces of the divided image data.
A digital image data recording apparatus comprising:

It is obtained by imaging a subject using the solid-state electronic image sensor, including a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the image data amount of unit image data for one frame image. Imaging means for outputting fine image data representing a subject image,
Image data dividing means for dividing the fine image data into n pieces of divided image data so that the data amount of the fine image data output from the imaging means is equal to the data amount of the unit image data;
Identification data generating means for generating identification data indicating which part of the fine image the divided image represented by the divided image data obtained by the image data dividing means is;
Reduced image data generating means for generating reduced image data representing a reduced image of the fine image represented by the fine image data output from the imaging means and having a data amount equal to the data amount of the unit image data;
Image data processing means for replacing part of the reduced image data generated by the reduced image data generating means with image data representing a frame so that a frame is formed in the image;
Divided image data recording control means for recording n divided image data output from the image data dividing means in n unit image data recording areas of a recording medium;
Identification data recording control means for recording identification data generated by the identification data generating means in association with n pieces of the divided image data in an auxiliary area other than the unit image data recording area of the recording medium, and the image data processing means Reduced image data recording control means for recording reduced image data in which part of the image data is replaced with image data representing a frame by the n pieces of divided image data in a unit image data recording area of the recording medium;
A digital image data recording apparatus comprising:

It is obtained by imaging a subject using the solid-state electronic image sensor, including a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the image data amount of unit image data for one frame image. Imaging means for outputting fine image data representing a subject image,
Image data dividing means for dividing the fine image data into n pieces of divided image data so that the data amount of the fine image data output from the imaging means is equal to the data amount of the unit image data;
Identification data generating means for generating identification data indicating which part of the fine image the divided image represented by the divided image data obtained by the image data dividing means is;
Reduced image data generation means for generating a reduced image data representing a reduced image of the fine image represented by the fine image data output from the imaging means and having a data amount of the unit image data;
Reduced image data insertion for inserting the reduced image data generated by the reduced image data generating means into the divided image data obtained by the image data dividing means so that the reduced image appears in a partial area of the divided image means,
By divided image data recording control means for recording n divided image data into which reduced image data has been inserted by the reduced image data insertion means in n unit image data recording areas of a recording medium, and by the identification data generating means Identification data recording control means for recording generated identification data in an auxiliary area other than the unit image data recording area of the recording medium in association with the n pieces of divided image data;
A digital image data recording apparatus comprising:

The divided image data recording control means compresses the n divided image data and records them in n unit image data recording areas of the recording medium.
4. The digital image data recording apparatus according to claim 1, 2, or 3.

From a fine image data obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the image data amount of unit image data for one frame image, the data amount The fine image data is divided into n divided image data so as to be equal to the data amount of the unit image data, and is recorded in n unit image data recording areas of a recording medium, and the divided image is recorded. Identification data indicating where the divided image represented by the data corresponds to which part of the fine image is associated with the n pieces of divided image data and recorded in an auxiliary area other than the unit image data recording area. Reading means for reading n pieces of divided image data and identification data from a recording medium;
Mode setting means for selectively setting the video playback mode and the still image playback mode;
Based on the identification data read by the reading means in response to the setting of the still image reproduction mode by the mode setting means, the fine image data representing the fine image is restored from the n pieces of divided image data. Based on the identification data read by the reading means in response to the setting of the moving image reproduction mode by the fine image data restoring means to be output and the mode setting means, which part of the fine image corresponds to Identification code data insertion means for inserting identification code data into the n pieces of divided image data so as to display the identification code to be displayed on the divided images;
A digital image data reproducing apparatus comprising:

n pieces of the divided image data are recorded in n unit image data recording areas after a part of the image data is image data representing a frame so that a frame is formed in the divided image. And
Image data representing the frame so as to remove the frame formed inside the fine image when the fine image data is restored from the n divided image data based on the identification data read by the reading means. Frame image data removal means for performing the removal processing of
The digital image data generation device according to claim 5, comprising:

From a fine image data obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the image data amount of unit image data for one frame image, the data amount The fine image data is divided into n pieces of divided image data so that is equal to the data amount of the unit image data, and the n pieces of divided image data are partially formed so that a frame is formed on the divided image. To which part of the fine image the divided image recorded in the n unit image data recording areas and represented by the divided image data corresponds to image data representing a frame. N pieces of divided image data from a recording medium in which identification data representing is associated with the n pieces of divided image data and recorded in an auxiliary area other than the unit image data recording area Reading means for reading the preliminary identification data,
Fine image data restoring means for restoring and outputting the fine image data representing the fine image from the n pieces of divided image data based on the identification data read by the reading means, and the identification read by the reading means Frame image data for removing the image data representing the frame so as to remove the frame formed inside the fine image when the fine image data is restored from the n divided image data based on the data Removal means,
A digital image data reproducing apparatus comprising:

The amount of data from fine image data obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the amount of unit image data for one frame image Is divided into n pieces of divided image data and recorded in n unit image data recording areas of the recording medium so that the amount of the fine image is equal to the data amount of the unit image data. The reduced image data representing the reduced image and having the data amount of the unit image data is recorded in the unit image data recording area, and the divided image represented by the divided image data corresponds to any part of the fine image. The identification data indicating whether or not to be recorded is associated with n pieces of the divided image data and recorded on the auxiliary area other than the unit image data recording area. Of the divided image data, the thumbnail image data and reads the identification data reading means,
Reduced image data insertion means for inserting the reduced image data into the divided image data read from the recording medium so that the reduced image appears in a partial area of the divided image, and identification data read by the reading means The fine image data representing the fine image in which the reduced image represented by the reduced image data inserted by the reduced image data inserting means is inserted from the n pieces of divided image data is restored and output. Image data restoration means,
A digital image data reproducing apparatus comprising:

Fine image data representing a subject image obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount that is n (n is an integer of 2 or more) times the amount of unit image data for a single frame image. And
The fine image data is divided into n pieces of divided image data so that the data amount of the fine image data obtained by the imaging becomes the data amount of the unit image data,
Obtaining identification data indicating to which part of the fine image the divided image represented by the divided image data obtained by the image data dividing process corresponds;
Replacing a part of the n pieces of divided image data with image data representing a frame so that a frame is formed in the image;
N pieces of divided image data in which a part of the image data is replaced by image data representing a frame by the image data replacement process are recorded in n unit image data recording areas of the recording medium;
Identification data generated by the identification data generation process is recorded in an auxiliary area other than the unit image data recording area of the recording medium in association with the n pieces of divided image data.
Digital image data recording method.

Fine image data representing a subject image obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount that is n (n is an integer of 2 or more) times the amount of unit image data for a single frame image. And
The fine image data is divided into n pieces of divided image data so that the data amount of the fine image data obtained by the imaging becomes the data amount of the unit image data,
Obtaining identification data indicating to which part of the fine image the divided image represented by the divided image data obtained by the image data dividing process corresponds;
Representing a reduced image of the fine image represented by the fine image data obtained by the imaging, generating reduced image data having a data amount of the unit image data,
Replacing a part of the reduced image data generated by the reduced image data generation process with image data representing a frame so that a frame is formed in the image;
N pieces of divided image data obtained by the image data division processing are recorded in n unit image data recording areas of a recording medium;
Identification data generated by the identification data generation process is recorded in an auxiliary area other than the unit image data recording area of the recording medium in association with the n pieces of divided image data;
Reduced image data in which part of the image data is replaced with image data representing a frame by the image data replacement process is recorded in a unit image data recording area of the recording medium in association with the n divided image data;
Digital image data recording method.

Fine image data representing a subject image obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount that is n (n is an integer of 2 or more) times the amount of unit image data for a single frame image. And
The fine image data is divided into n pieces of divided image data so that the data amount of the fine image data obtained by the imaging becomes the data amount of the unit image data,
Obtaining identification data indicating to which part of the fine image the divided image represented by the divided image data obtained by the image data dividing process corresponds;
Representing a reduced image of the fine image represented by the fine image data obtained by the imaging, generating reduced image data having a data amount of the unit image data,
The reduced image data generated by the reduced image data generation process is inserted into the divided image data obtained by the image data division process so that the reduced image appears in a partial area of the divided image,
N pieces of divided image data into which reduced image data has been inserted by the reduced image data insertion process are recorded in n unit image data recording areas of a recording medium;
Identification data generated by the identification data generation process is recorded in an auxiliary area other than the unit image data recording area of the recording medium in association with the n pieces of divided image data.
Digital image data recording method.

N pieces of divided image data obtained by the image data division processing are compressed and recorded in n unit image data recording areas of the recording medium.
12. The digital image data recording method according to claim 9, 10 or 11.

From a fine image data obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the image data amount of unit image data for one frame image, the data amount The fine image data is divided into n divided image data so as to be equal to the data amount of the unit image data, and is recorded in n unit image data recording areas of a recording medium, and the divided image is recorded. Identification data indicating where the divided image represented by the data corresponds to which part of the fine image is associated with the n pieces of divided image data and recorded in an auxiliary area other than the unit image data recording area. N pieces of the divided image data and identification data are read from the recording medium;
The video playback mode and still image playback mode can be selectively set,
Based on the identification data read by the reading process in response to setting of the still image reproduction mode, the fine image data representing the fine image is restored and output from the n pieces of divided image data.
Based on the read identification data in accordance with the setting of the moving image reproduction mode, the n divisions so as to display an identification code indicating which part of the fine image corresponds to the divided image. Insert identification code data into the image data,
Digital image data reproduction method.

n pieces of the divided image data are recorded in n unit image data recording areas after a part of the image data is image data representing a frame so that a frame is formed in the divided image. And
When the fine image data is restored from the n divided image data based on the identification data read by the reading process, image data representing the frame is removed so as to remove the frame formed inside the fine image. Perform removal process,
14. The digital image data reproduction method according to claim 13.

From a fine image data obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the image data amount of unit image data for one frame image, the data amount The fine image data is divided into n pieces of divided image data so that is equal to the data amount of the unit image data, and the n pieces of divided image data are partially formed so that a frame is formed on the divided image. To which part of the fine image the divided image recorded in the n unit image data recording areas and represented by the divided image data corresponds to image data representing a frame. N pieces of divided image data from a recording medium in which identification data representing is associated with the n pieces of divided image data and recorded in an auxiliary area other than the unit image data recording area Read the preliminary identification data,
Based on the identification data read by the reading process, the fine image data representing the fine image is restored from the n pieces of divided image data,
Image data representing the frame so as to remove the frame formed inside the fine image when the fine image data is restored from the n pieces of divided image data based on the identification data read by the reading process. To remove
Digital image data reproduction method.

From a fine image data obtained by imaging a subject using a solid-state electronic image sensor that generates a data amount n (n is an integer of 2 or more) times the image data amount of unit image data for one frame image, the data amount The reproduced image data is divided into n divided image data so as to be equal to the data amount of the unit image data, and then recorded in n unit image data recording areas of the recording medium. The reduced image data representing the reduced image and having the data amount of the unit image data is recorded in the unit image data recording area, and the divided image represented by the divided image data corresponds to any part of the fine image. From the recording medium recorded in the auxiliary area other than the unit image data recording area in association with the n pieces of divided image data. Reading of the divided image data, the thumbnail image data and the identification data,
Inserting the reduced image data into the divided image data read from the recording medium so that the reduced image appears in a partial area of the divided image;
The fine image representing the fine image in which the reduced image represented by the reduced image data inserted by the reduced image data insertion processing is inserted from the n pieces of divided image data based on the identification data read by the reading processing. Restore and output image data,
Digital image data reproduction method.