JP4795249B2 - ビデオ画像を表示するための装置及び方法 - Google Patents
ビデオ画像を表示するための装置及び方法 Download PDFInfo
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- JP4795249B2 JP4795249B2 JP2006544547A JP2006544547A JP4795249B2 JP 4795249 B2 JP4795249 B2 JP 4795249B2 JP 2006544547 A JP2006544547 A JP 2006544547A JP 2006544547 A JP2006544547 A JP 2006544547A JP 4795249 B2 JP4795249 B2 JP 4795249B2
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- light modulator
- spatial light
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Description
複製及び変換投影光学系は、適当な任意の種類のものでよく、例えば、変換投影光学系は、フーリエ変換レンズでよいことが理解されるであろう。同様に、OASLMも適当な任意の種類のものでよく、例えば参照により本明細書に組み込まれる、S.Mias等のOpt Eng2005年1月に記載されたようなものでよい。
次に、上で説明された装置が、リアルタイム・ビデオ・ホログラフィ投影を生成するのに使用され得る対応(manner)が以下で説明される。図10を参照すると、第1の方法実施形態では、ビデオ信号から直接生成された、m×m画素の入力強度領域Txyを表す信号(802)が、第1の処理ブロック(801)を有する処理装置(820)に入力される。この実施形態では、処理装置(20)は、所望の関数を実施することを可能とするコードを実行するフィールド・プログラマブル・ゲート・アレイ(FPGA)を含む。他の実施形態ではASICが使用され、更に他の実施形態では、プログラム化汎用コンピュータが使用される。各前記複数の画素化ホログラムを得るための第1の処理ブロック(801)は、出力(803)において、次式
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4.
5.
SLM上にキノフォームを表示するのに、上で論じられた2値又は多値量子化を使用した様々な変調方式が可能であることが理解されるであろう。特に、変調方式は、シーケンシャルな赤、緑、及び青の照明下でのホログラム再構築が、カラーの(coloured)グレー・スケール画像を生じるように採用されることができる。
1)実像における全ての実画素にわたってランダム位相分布を想定する。
2)完全な離散高速フーリエ変換(FFT)を行う。
3)実数部を排除(reject)し虚数部のFFTを行う。
4)これは、(我々が排除することになる)実像の第1の反復を、それに関連するP1と呼ばれる改善された位相分布と共に生じる。
5)実像に加えて新たな虚数部のFFTを行う。
6)実数部を排除する。虚数部は、ここでは、フレーム1のための位相ホログラムとして受け入れられる。
12 対象物
14 処理装置
16 プログラム可能な回折素子(SLM、キノフォーム)
18 照明源
20 画像
22 光学系
100 2値SLM
120〜123 画素
130〜133 位相マスク画素
200 レーザ
202 ビーム・エクスパンダ
204 偏光ビーム・スプリッタ
206 SLM
208 スクリーン
210 追加のレンズ(投射光学系)
600 SLM
602 複製光学系
604 OASLM
608 スクリーン
801 第1の処理ブロック
802 信号
803 出力(第1のデータ・セット)
804 第2の処理ブロック
805 出力(第2のデータ・セット)
806 第3の処理ブロック
807 出力(第3のデータ・セット)
808 第5の処理装置
809 第4のデータ・セット
810 2値化ステージ
811 第5のデータ・セット
812 強誘電性液晶SLM
820 処理装置
900 SLM
902 スイッチング素子
904 Eout
906 遠視野
1102 平行光ビーム
1104 位相限定SLM
1106 光学系
1108 位相コントラスト・フィルタ
1110 光学系
1112 像平面
Claims (40)
- スクリーン上に2次元ビデオ画像を投影する方法であって、前記2次元ビデオ画像はシーケンシャルな画像フレームで構成されており、前記方法は、
処理装置において前記シーケンシャルな画像フレームを受け取るステップと、
前記処理装置において、リアルタイムで各画像フレームを処理して1つ又は複数のそれぞれの位相限定キノフォームを表現する量子化データを得るステップと、
前記キノフォームのそれぞれをシーケンシャルに表現するために、1つ又は複数のそれぞれの位相限定キノフォームを表現する前記量子化データを、反射型画素化リキッド・クリスタル・オン・シリコン(LCOS)位相限定空間光変調器に書き込むステップと、
位相変調出力ビームを提供するために、前記反射型画素化LCOS位相限定空間光変調器を照明するステップと、
前記2次元ビデオ画像を見るために、リアルタイムで前記スクリーン上に再生領域において前記シーケンシャルな画像フレームを再構築するため、光学系により前記位相変調出力ビームを処理するステップであって、前記光学系がフーリエ変換レンズを備える、
を含む、2次元ビデオ画像を投影する方法。 - 前記ビデオ画像が、時変又は静止画像の1つである、請求項1に記載の方法。
- 最適化されたサブセットを得、且つ前記最適化されたサブセットを再び組み合わせるための、初期キノフォームのそれぞれのサブセットの並行処理を更に含む、請求項1又は2に記載の方法。
- 前記初期キノフォームのサブセットが、初期キノフォームのセグメントを含む、請求項3に記載の方法。
- 前記初期キノフォームが、ランダムに生成されたもの、又は所定のもの、又は初期FFTの結果、又は再生された位相分布である、請求項3又は請求項4に記載の方法。
- 前記画像フレームが、それぞれのキノフォームを得るために、双方向性反復最適化アルゴリズム、一方向性反復最適化アルゴリズム、又は、双方向性反復量子化手順、又は一方向性非反復手順のいずれか1つを使用して処理される、請求項1乃至5のいずれかに記載の方法。
- 演算のパラメータを制御して、グレー・スケール及びカラーの少なくとも1つをもたらすことを更に含む、請求項1乃至6のいずれかに記載の方法。
- 前記空間光変調器が直接変調されて、カラー、又はグレー・スケール、或いはカラー及びグレー・スケールをもたらす、請求項7に記載の方法。
- 前記空間光変調器が、2値量子化方式を実現し、且つ、カラー、又はグレー・スケール、或いはカラー及びグレー・スケールをもたらすようにシーケンシャルに多重化されたフレームである、請求項8に記載の方法。
- 前記空間光変調器が、多値量子化方式を実現して、カラー、又はグレー・スケール、或いはカラー及びグレー・スケールをもたらす、請求項8に記載の方法。
- 前記照明源が時間領域において変調されて、カラー、又はグレー・スケール、或いはカラー及びグレー・スケールをもたらす、請求項7に記載の方法。
- 前記照明源がカラー領域において変調されて、カラー、又はグレー・スケール、或いはカラー及びグレー・スケールをもたらす、請求項7に記載の方法。
- 前記得られたキノフォームが、それぞれが前記画像フレームの空間又は強度分解を再構築する複数のキノフォームの1つを含む、請求項1乃至12のいずれかに記載の方法。
- 前記複数のキノフォームが合わさって実像を生じる、請求項13に記載の方法。
- ノイズ低減ステップを更に含む、請求項1乃至14のいずれかに記載の方法。
- 前記ノイズ低減が、多値量子化方式に従ってキノフォームを表示するように、前記空間光変調器をプログラムすることによって実現される、請求項15に記載の方法。
- 前記ノイズ低減が、複数の画像フレームにわたるノイズ平均化によって実現される、請求項15に記載の方法。
- 前記ノイズ低減が、各画像フレームの複数のサブフレームにわたるノイズ平均化によって実現される、請求項15に記載の方法。
- 各サブフレームが、最適化アルゴリズムにおいて生成される、請求項18に記載の方法。
- 前記最適化アルゴリズムが、Gerchberg Saxtonアルゴリズムである、請求項19に記載の方法。
- 前記ノイズ低減が、各位相ホログラムの空間多重化によって実現される、請求項15に記載の方法。
- 前記位相ホログラムが、前記プログラム可能な回折素子において空間的に多重化される、請求項21に記載の方法。
- 前記位相ホログラムが、光学的にアドレス可能な空間光変調器において空間的に多重化される、請求項21に記載の方法。
- 各画像フレームが、複数のシーケンシャルな画像サブフレームを含み、前記空間多重化ステップが、シーケンシャルなサブフレームを並置することを含む、請求項18乃至20のいずれかに記載の方法。
- 前記ノイズ低減が、系統的ノイズを軽減するように照明源波面を成形することによって実現される、請求項15に記載の方法。
- スクリーン上に2次元ビデオ画像を投影する投影装置であって、前記2次元ビデオ画像はシーケンシャルな画像フレームで構成されており、前記投影装置は、
処理装置(14)と、反射型画素化LCOS位相限定空間光変調器(16)と、前記位相限定空間光変調器を照明するための照明源(18)とを備え、
前記処理装置は、前記空間画像フレームを受け取るための入力と、データを前記反射型画素化LCOS位相限定空間光変調器(16)に書き込むための出力とを有し、
前記処理装置は、
1つ又は複数のそれぞれの位相限定キノフォームを表現する量子化データを得るため、リアルタイムで各画像フレーム(12)を処理し、
前記キノフォームのそれぞれをシーケンシャルに表現するために、1つ又は複数のそれぞれの前記位相限定キノフォームを表現する前記量子化データを、前記反射型画素化LCOS位相限定空間光変調器に書き込み、
これにより、前記反射型画素化LCOS位相限定空間光変調器を照明して位相変調出力ビームを提供し、
前記2次元ビデオ画像を見るために、リアルタイムで前記スクリーン上に前記シーケンシャルな画像フレームを再構築するため、投影装置がさらに光学系を備えるように構成されている、前記投影装置。 - 前記ビデオ画像が、時変及び静止画像の少なくとも1つを含む、請求項26に記載の投影装置。
- 前記空間光変調器が、2値量子化を実現する、請求項26又は27に記載の投影装置。
- 前記空間光変調器が、多値量子化を実現する、請求項26又は27に記載の投影装置。
- 前記空間光変調器が、プログラム可能な構成要素として、ネマチック(LCOS)と、エレクトロクリニックLCOSと、ねじれ螺旋型LCOSと、V形スイッチングLCOSとのいずれか1つを含む、請求項26乃至29のいずれかに記載の投影装置。
- 前記光学系は、前記空間光変調器に関連する投影光学系を更に含む、請求項26乃至30のいずれかに記載の投影装置。
- 投影光学系が、前記キノフォームにプログラムされる、請求項26乃至30のいずれかに記載の投影装置。
- 前記処理装置が、FFT処理装置、フィールド・プログラマブル・ゲート・アレイ処理装置、又はデジタル信号処理装置の少なくとも1つを含む、請求項26乃至32のいずれかに記載の投影装置。
- 前記照明源は、部分的にコヒーレントな照明源である、請求項26乃至33のいずれかに記載の投影装置。
- 前記照明源が、カラー、又はグレー・スケール、或いはカラー及びグレー・スケールをもたらすように変調されるように構成される、請求項34に記載の投影装置。
- 前記表示装置内の系統的ノイズを軽減するように照明ビームを成形するように構成された照明源波面成形光学系を更に含む、請求項34又は請求項35に記載の投影装置。
- 光学的にアドレス可能な空間光変調器(OASLM)を更に含む、請求項34乃至36のいずれかに記載の投影装置。
- 前記キノフォームを前記OASLM上に空間的に多重化するように構成された空間多重化光学系を更に含む、請求項37に記載の投影装置。
- 前記空間変調光学系が、時間的に変動するキノフォームを空間的に多重化するように更に構成される、請求項37に記載の投影装置。
- 前記表示スクリーンが、光学的にオフ・アクシスに配置される、請求項34乃至39のいずれかに記載の投影装置。
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CN100595698C (zh) | 2010-03-24 |
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CN1918519B (zh) | 2011-05-11 |
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CN1918519A (zh) | 2007-02-21 |
EP1700172A2 (en) | 2006-09-13 |
US8654048B2 (en) | 2014-02-18 |
KR20060130609A (ko) | 2006-12-19 |
KR101204968B1 (ko) | 2012-11-26 |
US20120105580A1 (en) | 2012-05-03 |
WO2005059881A2 (en) | 2005-06-30 |
EP3067754A1 (en) | 2016-09-14 |
JP2007520841A (ja) | 2007-07-26 |
JP2007523359A (ja) | 2007-08-16 |
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