JP2021531491A - ホログラム計算の方法 - Google Patents
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Abstract
Description
Claims (16)
- 振幅成分および位相成分を有するホログラムを計算する方法であって、
前記方法が、順序付けられた、
(i)振幅を表す複数のデータ値を含む入力画像を受信するステップと、
(ii)前記複数のデータ値の各データ値にランダムな位相値を割り当てて、複素データセットを形成するステップと、
(iii)前記複素データセットの逆フーリエ変換を実行するステップと、
(iv)前記複素データセットの各複素データ値を、各々が振幅変調値および位相変調値を含む複数の許容可能な複素データ値のうちの1つに制約して、ホログラムを形成するステップと
を含み、
前記複数の許容可能な複素データ値の前記位相変調値が、実質的に少なくとも3π/2、場合によっては2πに及び、前記許容可能な複素データ値の少なくとも1つが、実質的にゼロの振幅変調値および実質的にゼロの位相変調値を有する、
ホログラムを計算する方法。 - (v)前記複素データセットの順方向フーリエ変換を実行するステップと、
(vii)前記複素データセットの前記振幅成分と前記入力画像との間の差を測定するステップと
をさらに含む、
請求項1に記載のホログラムを計算する方法。 - 前記測定された差が誤差よりも大きい場合、前記方法が、
(vii)前記複素データセットの前記位相成分を、前記入力画像の振幅を表す前記複数のデータ値、または前記入力画像から導出された振幅を表す複数のデータ値と組み合わせるステップと、
(viii)前記複素データセットを逆フーリエ変換するステップと、
(ix)各複素データを前記許容可能な複素データ値の1つに制約してホログラムを形成するステップと
をさらに含む、
請求項2に記載のホログラムを計算する方法。 - 前記測定された差が前記誤差よりも小さくなるまで、前記順序付けられたステップ(v)〜(ix)を繰り返すステップをさらに含む、
請求項3に記載のホログラムを計算する方法。 - 前記複素平面内のラインを定義するステップであって、前記ラインが、原点の周りの実質的に閉ループである第1のセクションと、前記ループの円周から前記複素平面の前記原点に向かって内側に延在する第2のセクションとを含む、前記原点に向かう螺旋である、ステップと、
実質的に前記ライン上に前記複数の許容可能な複素データ値を定義するステップと
をさらに含む、
請求項1から4のいずれか一項に記載のホログラムを計算する方法。 - 前記第1のセクションが実質的に円形または楕円形である、
請求項5に記載のホログラムを計算する方法。 - 前記第2のセクションが原点まで延在する、
請求項5または6に記載のホログラムを計算する方法。 - 前記第2のセクションが前記原点を過ぎて延在する、
請求項5から7のいずれか一項に記載のホログラムを計算する方法。 - 前記第2のセクションが実質的に螺旋状または円弧状である、
請求項5から8のいずれか一項に記載のホログラムを計算する方法。 - 前記第2のセクションの長さが前記第1のセクションの長さの半分未満、場合によっては、前記第1のセクションの前記長さの4分の1未満である、
請求項5から9のいずれか一項に記載のホログラムを計算する方法。 - 前記複数の許容可能な複素データ値を定義する前記ステップが、前記複素平面内の前記ライン上に512以下の許容可能な複素データ値を定義し、場合によっては128以下を定義し、さらに場合によっては64以下を定義するステップを含む、
請求項5から10のいずれか一項に記載のホログラムを計算する方法。 - 前記複素データセットの複素データ値ごとに、前記制約するステップが、
前記振幅成分および位相成分を、前記複素平面内で最も近い許容可能な複素データ値の前記振幅成分および位相成分と置き換えるステップ
を含む、
請求項1から11のいずれか一項に記載のホログラムを計算する方法。 - 前記複素データセットの複素データ値ごとに、前記制約するステップが、
(a)前記振幅成分がしきい値未満である場合、前記振幅成分および位相成分をゼロと置き換えるステップと、
(b)前記振幅成分が前記しきい値以上である場合、前記振幅成分および位相成分を、前記複素平面内で最も近い許容可能な複素データ値の前記振幅成分および位相成分と置き換えるステップと
を含む、
請求項1から11のいずれか一項に記載のホログラムを計算する方法。 - 前記複素データセットの複素データ値ごとに、前記制約するステップが、
前記振幅成分および位相成分を、前記複素データ値を含む前記複素平面の象限内で最も近い許容可能な複素データ値の前記振幅成分および位相成分と置き換えるステップ
を含む、
請求項1から11のいずれか一項に記載のホログラムを計算する方法。 - 請求項1から14のいずれか一項に記載のホログラムを計算する方法と、
少なくとも1つのディスプレイデバイスの光変調ピクセルに前記ホログラムを表示するステップと、
コヒーレント光で前記少なくとも1つのディスプレイデバイスを照射し、フーリエ変換を実行して再生平面でホログラフィック復元を生成するステップと
を含む、
ホログラフィック投影の方法。 - 前記光変調ピクセルが1つのディスプレイデバイス上に提供され、各光変調ピクセルが、複数の複素変調レベルに従って振幅と位相の両方を変調するように動作可能であり、前記複数の複素変調レベルが、前記複数の許容可能な複素データ値である、
請求項15に記載のホログラフィック投影の方法。
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GB1813767.9A GB2576552B (en) | 2018-08-23 | 2018-08-23 | Light modulator |
GB1813773.7A GB2576553B (en) | 2018-08-23 | 2018-08-23 | Method of hologram calculation |
PCT/EP2019/072509 WO2020039038A1 (en) | 2018-08-23 | 2019-08-22 | Method of hologram calculation |
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CN112212807B (zh) * | 2020-10-14 | 2022-03-01 | 福建师范大学 | 基于单幅频谱强度图像动态采样进行迭代的相位加速读取方法和读取装置 |
CN115097709B (zh) * | 2022-07-05 | 2023-11-17 | 东南大学 | 一种基于复数优化器或复数求解器的全息编码方法 |
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