JP4256342B2 - 眼の第1画像と眼の第2画像とを重ね合わせるシステム - Google Patents
眼の第1画像と眼の第2画像とを重ね合わせるシステム Download PDFInfo
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- JP4256342B2 JP4256342B2 JP2004509342A JP2004509342A JP4256342B2 JP 4256342 B2 JP4256342 B2 JP 4256342B2 JP 2004509342 A JP2004509342 A JP 2004509342A JP 2004509342 A JP2004509342 A JP 2004509342A JP 4256342 B2 JP4256342 B2 JP 4256342B2
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Description
F1=TA1
F2=TA2+A1*sin(θ)+B1*cos(θ)
ここで、TAは、真の回し運動角度の推定値であり、θはマーカの角度座標である。回し運動角度データに関数を適用すると、その後、基準画像と第2画像との間の回し運動角度θ0についての推定値を提供することができる。
θtotal(t)=θ0+θ(t)
In(Ax+d)=I0(x)
Bin=Bi−X+Xn
Bi=Bi−X
B'i=Bi−Di
θn=meani(θ'i−θi)
患者の眼の基準画像と患者の眼の第2画像とを重ね合わせる位置合わせアルゴリズムについての実験結果が、Matlabソフトウェアを使用して得られた。フィッティングの確度は、いくつかの因子、すなわち、(1)フィッティングに使用された点の数(基準点のうち少なくとも半分(12個)を使用しなければならない)、(2)フィッティングのRMS誤差(許容される最高RMS誤差は1度)、(3)基準点のマッチングの視覚的検査によって決定され、分度器を用いて取得された測定値が推定値の確認に使用された。実験のオリジナル・セットは、倍率0.885のレーザ・カメラによって実施された。暗色の眼の画像すべてが、少なくとも1つの方法によって回し運動角度の正確な予測を与えた。しかし、明色の眼は、その倍率では、信頼性のある回し運動角度の推定値を得るのに十分なテクスチャをもたなかった。
回し運動追跡アルゴリズムを試験するために、当該アルゴリズムがいくつかの試験で実行された。本発明の方法とソフトウェアを使用して患者の眼の回し運動の動きを追跡した結果の第1のセットは、レーザ手術システムのカメラ20からのビデオ・フレームの画像を人為的に回転させるものであった。画像を、後続のフレームそれぞれについて反時計回りに1度ずつ回転させた。回転された合計15個のフレームが、回し運動追跡アルゴリズムによって解析された。オリジナル・フレームと最終フレームが、それぞれ図18Aと図18Bに示されている。回し運動追跡アルゴリズムの適用は、あらゆるフレームについてその実際の値から0.2度以内の精度で正確であった。
θtotal(t)=追跡[(基準画像、ビデオ)(t)+位置合わせ[波面基準画像]
Claims (26)
- 眼の第1画像と眼の第2画像とを重ね合わせるシステムであって、
眼の第1画像を受け取るように構成されたコンピュータ・プロセッサと、
前記コンピュータ・プロセッサに結合された、眼の第2画像を得ることのできる撮像デバイスとを含んでおり、
前記コンピュータ・プロセッサが、前記第1画像と前記第2画像内で共通の基準点の場所を突き止め、前記第1画像内の眼の虹彩を複数のセクタに分割し各セクタ内のマーカの場所を突き止め、さらに、前記第1画像内の各マーカについて前記第2画像内で対応するマーカを見つけるように構成され、前記コンピュータ・プロセッサは、前記共通の基準点の周りで前記第1画像に加えて前記第2画像をアンラップ処理し、前記第1画像におけるマーカと前記第2画像におけるマーカーとがマッチングし得るように前記第1画像と第2画像をスケーリング処理し、前記第1画像と前記第2画像とを眼球回旋的に重ね合わせることを特徴とするシステム。 - 前記基準点が瞳孔中心と虹彩中心の少なくとも1つを含む請求項1に記載のシステム。
- 眼の波面計測結果を得る波面計測デバイスを含んでおり、前記波面計測デバイスが、波面計測結果を得る間に眼の第1画像を得る撮像アセンブリを含む請求項1に記載のシステム。
- 前記コンピュータ・プロセッサに結合された、眼にレーザ・ビーム処置を施すレーザ・アセンブリを含む請求項1に記載のシステム。
- 前記撮像デバイスが、眼がレーザ・ビームの光軸に沿って位置決めされているときに眼を撮像するように位置決めされる請求項4に記載のシステム。
- 前記コンピュータ・プロセッサが、前記第1画像と前記第2画像との間の眼の眼球回旋を推定するように構成される請求項1に記載のシステム。
- 眼の第1画像と眼の第2画像とを重ね合わせるシステムであって、
前記第1画像を得る手段と、
前記眼の第2画像を得る手段とを含んでおり、前記第1画像と前記第2画像が瞳孔と虹彩の少なくとも一部分を含んでおり、前記システムがさらに、
前記第1画像をいくつかの周囲セクタに分ける手段と、
前記複数のセクタのそれぞれにおいて、前記第1画像内の眼の虹彩上で少なくとも1つのマーカを選択する手段と、
前記第2画像内の虹彩上で対応するマーカの場所を突き止める手段と、
前記第1画像と第2画像の虹彩をアンラップ処理する手段と、
前記第1画像と前記第2画像の共通の基準点をほぼマッチングさせ、前記第1の画像のアンラップ処理された虹彩内のマーカと前記第2の画像のアンラップ処理された虹彩内のマーカとの間の回し運動回旋を推定する手段と
を含むことを特徴とするシステム。 - 眼の第1画像と眼の第2画像とを重ね合わせるシステムであって、前記第1画像と前記第2画像が瞳孔と虹彩の少なくとも一部分を含んでおり、かつ眼のレーザ処置を前記眼の第1画像に関連させて行うシステムにおいて、
前記第1画像と第2画像とを受け取るように構成されたコンピュータ・プロセッサであって、
虹彩の複数の周囲セクタを識別し、
それぞれが関連するセクタ内に配置されている複数のマーカを、前記第1画像内の眼の虹彩上で選択し、
前記第2画像内の虹彩上で、対応する複数のマーカの場所を突き止め、
前記第1画像と前記第2画像内の共通の基準点をほぼマッチングさせ、前記第1画像と第2画像において共通基準点の周りで虹彩をアンラップ処理してアンラップ処理された虹彩とし、前記第1画像のアンラップ処理された虹彩上のマーカと、前記第2画像のアンラップ処理された虹彩上のマーカとをマッチングさせることによって、前記眼の第1画像と前記眼の第2画像とを重ね合わせ、
レーザ処置を、前記眼の第2画像で心合わせし且つ回し運動についての位置合わせをして行うプログラム
を有するコンピュータ・プロセッサを含むシステム。 - 前記共通の基準点が瞳孔中心である請求項8に記載のシステム。
- 前記共通の基準点が瞳孔中心と虹彩中心に応じて画定される請求項8に記載のシステム。
- 瞳孔中心、虹彩中心、と虹彩の境界の場所を突き止めることをさらに含んでおり、少なくとも1つのマーカを選択することが、前記虹彩中心と前記瞳孔中心の少なくとも1つに対する前記マーカの相対位置を見つけることを含む請求項8に記載のシステム。
- 前記第1画像と前記第2画像の少なくとも1つを平滑化することを含む請求項8に記載のシステム。
- アンラップ処理することが、デカルト座標を極座標に変換することを含む請求項8に記載のシステム。
- 分割することが、24個のセクタを創り出すことを含んでおり、各セクタが15度の範囲に及ぶ請求項8に記載のシステム。
- 前記セクタが24個以上のセクタを含む請求項8に記載のシステム。
- 前記セクタが24個以下のセクタを含む請求項8に記載のシステム。
- 前記マーカがコントラストの高い虹彩斑であり、選択することが、各セクタ内で前記コントラストの高い虹彩斑の場所を突き止めることを含む請求項8に記載のシステム。
- コントラストの高い虹彩斑それぞれからプロパティを抽出することを含む請求項17に記載のシステム。
- 前記第2画像内で前記マーカの場所を突き止めることが、探索範囲を、前記眼の第1画像内の前記マーカの位置から15度以下の範囲内に制限することを含む請求項8に記載のシステム。
- 選択することが、前記眼の第1画像上に人工のランドマークを描くことを含む請求項8に記載のシステム。
- 前記第1画像を得る第1カメラと、前記第2画像を得る第2カメラとをさらに含む請求項8に記載のシステム。
- 前記第2画像がビデオ・ストリームからのフレームである請求項8に記載のシステム。
- 前記第1画像内のマーカと前記第2画像内のマーカとの間の、回し運動角度変位を推定することを含む請求項8に記載のシステム。
- 回し運動角度変位を推定することが、楕円形の瞳孔を補正することを含む請求項23に記載のシステム。
- 回し運動角度変位を推定することが、推定された回し運動回旋を反復重み付け関数でフィッティングして正弦歪みを補正することを含む請求項23に記載のシステム。
- さらに、選択することが、虹彩上で複数のマーカの場所を突き止めることを含む請求項8に記載のシステム。
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012506272A (ja) * | 2008-10-22 | 2012-03-15 | ゼンゾモトリック インストルメンツ ゲゼルシャフト フュア イノベイティブ ゼンゾリク ミット ベシュレンクテル ハフツング | コンピューター支援眼部手術用の画像処理方法および装置 |
US8903145B2 (en) | 2008-10-22 | 2014-12-02 | Alcon Pharmaceuticals Ltd. | Method and apparatus for image processing for computer-aided eye surgery |
JP2021047098A (ja) * | 2019-09-19 | 2021-03-25 | 日本電信電話株式会社 | センシング方向推定装置、センシング方向推定方法及びプログラム |
JP7120548B2 (ja) | 2019-09-19 | 2022-08-17 | 日本電信電話株式会社 | センシング方向推定装置、センシング方向推定方法及びプログラム |
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JP2005528600A (ja) | 2005-09-22 |
US20090012505A1 (en) | 2009-01-08 |
US8740385B2 (en) | 2014-06-03 |
EP1516156A1 (en) | 2005-03-23 |
US20170151089A1 (en) | 2017-06-01 |
CN1650148A (zh) | 2005-08-03 |
US20080009840A1 (en) | 2008-01-10 |
US9596983B2 (en) | 2017-03-21 |
EP1516156B1 (en) | 2019-10-23 |
CA2487411C (en) | 2011-06-14 |
US10251783B2 (en) | 2019-04-09 |
MXPA04011893A (es) | 2005-03-31 |
US7431457B2 (en) | 2008-10-07 |
US20140316390A1 (en) | 2014-10-23 |
AU2002346438A1 (en) | 2003-12-19 |
US20060161141A1 (en) | 2006-07-20 |
CN100442006C (zh) | 2008-12-10 |
CA2487411A1 (en) | 2003-12-11 |
US20030223037A1 (en) | 2003-12-04 |
EP1516156A4 (en) | 2008-09-10 |
WO2003102498A1 (en) | 2003-12-11 |
US7261415B2 (en) | 2007-08-28 |
US7044602B2 (en) | 2006-05-16 |
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