JP4472781B2 - デジタル画像取得装置におけるリアルタイムの顔探知 - Google Patents
デジタル画像取得装置におけるリアルタイムの顔探知 Download PDFInfo
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Description
Claims (41)
- デジタル画像取得装置を用いて、画像ストリームにおける顔探知を行う方法であって、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記サブサンプリング画像の少なくとも一部に対して、対応するインテグラルイメージを演算し、
d.前記インテグラルイメージの少なくとも一部分に対して、任意のサイズおよび位置を有する1つ又は複数の顔候補領域のセットを得るために、固定サイズの顔検出を行い、
e.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節し、
f.異なるサイズの可能性のある前記顔候補領域のセットを得るために、前記顔候補領域のセットを前回検出された顔領域と合成して、第2の取得画像を生成し、
g.前記第2の取得画像のうち、合成された顔候補領域のセットにおける領域に対応した領域に関して、
h. インテグラルイメージを演算し、
確定された顔領域のセットと、不採用の顔領域のセットとを得るために、前記インテグラルイメージの各合成領域に対して、可変サイズの顔検出を行う、
ことを特徴とする方法。 - 前記画像ストリームにおける複数の画像から、異なるサイズの前記顔候補領域を探知することを特徴とする請求項1に記載の方法。
- 代替基準に基づいて、前記固定サイズの顔検出および前記可変サイズの顔検出から、不採用の顔領域をチェックし、
前記不採用の顔領域のいずれかが顔領域であることを示すことをチェックすることに応じて、前回不採用の前記顔領域を前記確定された顔領域のセットに追加する、
ことを特徴とする請求項1に記載の方法。 - 前記チェックでは、前記不採用の顔領域に対して、スキンプロトタイプを適用することを特徴とする請求項3に記載の方法。
- 前記検出された顔領域とは、確定した顔領域のセットであることを特徴とする請求項1に記載の方法。
- 前記第2の取得画像のうち、前記合成された顔候補領域のセットにおける領域に対応した領域は、前記合成された顔候補領域のセットにおける各領域を囲む領域であることを特徴とする請求項1に記載の方法。
- 前記可変サイズの顔検出を行うことは、可変サイズのハール分類器における複数のカスケードを、インテグラルイメージの各合成領域に適用することであることを特徴とする請求項1に記載の方法。
- 前記ハール分類器における12以下のサイズの前記カスケードを適用することを特徴とする請求項7に記載の方法。
- 前記ハール分類器における3又は4のサイズを適用することを特徴とする請求項7に記載の方法。
- 各前記カスケードは、32分類器を有することを特徴とする請求項9に記載の方法。
- 前記固定サイズの顔検出を行うことは、固定サイズのハール分類器のカスケードを前記インテグラルイメージに適用することであることを特徴とする請求項1に記載の方法。
- 前記第2の取得画像を表示し、
前記表示された第2の取得画像に対して、探知された顔候補領域を重畳させる、
ことを特徴とする請求項1に記載の方法。 - デジタル画像取得装置を用いて、画像ストリームにおける顔探知を行う方法であって、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記サブサンプリング画像の少なくとも一部に対して、対応するインテグラルイメージを演算し、
d.前記インテグラルイメージの少なくとも一部分に対して、任意のサイズおよび位置を有する1つ又は複数の顔候補領域のセットを得るために、固定サイズの顔検出を行い、
e.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節することを特徴とする方法。 - 異なるサイズの可能性のある前記顔候補領域のセットを得るために、前記取得した顔候補領域のセットを前回検出された顔領域と合成することを特徴とする請求項13に記載の方法。
- メイン取得画像とともに、前記顔候補領域のグループのうち、少なくとも一部におけるサイズおよび位置の少なくとも一方を記憶することを特徴とする請求項13に記載の方法。
- 前記記憶された顔候補領域のサイズ又は位置に基づいて、前記メインの取得画像の空間選択的なポスト処理を行うことを特徴とする請求項15に記載の方法。
- 選択的な画像処理として、色補正、鮮鋭化、ぼけ、彩度、サブサンプリング、圧縮又は、これらの組み合わせを行うことを特徴とする請求項16に記載の方法。
- デジタル画像取得装置を用いて、画像ストリームにおける顔探知を行う方法であって、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記サブサンプリング画像の少なくとも一部に対して、対応するインテグラルイメージを演算し、
d.前記インテグラルイメージの少なくとも一部分に対して、任意のサイズおよび位置を有する1つ又は複数の顔候補領域のセットを得るために、固定サイズの顔検出を行い、
e.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節し、
f.前記デジタル画像取得システムにおけるフォーカスの状態を検出することを含むものであって、
前記調節において、前記フォーカスの状態が無限遠に移動して取得された前記第1の取得画像の場合は、サブサンプリングの解像度を最大の解像度に調節することを特徴とする方法。 - デジタル画像取得装置を用いて、画像ストリームにおける顔探知を行う方法であって、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記サブサンプリング画像の少なくとも一部に対して、対応するインテグラルイメージを演算し、
d.前記インテグラルイメージの少なくとも一部分に対して、任意のサイズおよび位置を有する1つ又は複数の顔候補領域のセットを得るために、固定サイズの顔検出を行い、
e.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節することを含み、
a〜eの処理を、画像ストリームのうち周期的に選択した複数の画像に対して行い、
前記複数の画像は、前記選択された複数の画像のうち、複数の画像に続く静止画像を含むことを特徴とする方法。 - 前記複数の選択画像の間における時間間隔が固定されていることを特徴とする請求項19に記載の方法。
- 前記複数の選択画像の間における時間間隔が変更可能であって、動作時に決定されることを特徴とする請求項20に記載の方法。
- 前記時間間隔は、前回の静止画像を処理する際の時間であることを特徴とする請求項21に記載の方法。
- 前記時間間隔は、前記複数の選択画像のうち、1つ又は複数の画像における内容が変化することに依存することを特徴とする請求項22に記載の方法。
- 前記固定サイズの顔検出は、少なくとも略32分類器を適用して行うことを特徴とする請求項22に記載の方法。
- デジタル画像取得装置を用いて、画像ストリームにおける顔探知を行う方法であって、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記サブサンプリング画像の少なくとも一部に対して、対応するインテグラルイメージを演算し、
d.前記インテグラルイメージの少なくとも一部分に対して、任意のサイズおよび位置を有する1つ又は複数の顔候補領域のセットを得るために、固定サイズの顔検出を行い、
e.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節し、
f.照明光を用いて前記第1の取得画像を取得した場合には、前記第1の取得画像のうち、探知された前記顔候補領域に対応した領域を、赤目現象のために分析することを特徴とする方法。 - 前記第1の取得画像において、赤目現象を補正することを特徴とする請求項25に記載の方法。
- 前記第1の取得画像とともに、前記赤目現象を示す情報を記憶させることを特徴とする請求項25に記載の方法。
- 1つ又は複数のプロセッサと、認識される複数の顔のそれぞれに対する識別子および関連するパラメータを有するデータベースと、画像ストリームにおいて顔を探知する反復方法を前記プロセッサに実行させるプログラムが組み込まれ、デジタルコード化された命令を含む1つ又は複数のデジタル記録媒体と、を備え、画像ストリームにおいて顔を探知するための画像処理装置であって、
前記方法は、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記サブサンプリング画像の少なくとも一部に対して、対応するインテグラルイメージを演算し、
d.1つ又は複数の顔候補領域のセットを得るために、前記インテグラルイメージの少なくとも一部分に対して、固定サイズの顔検出を行い、
e.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節し、
f.異なるサイズの可能性のある前記顔候補領域のセットを得るために、前記顔候補領域のセットを前回検出された顔領域と合成して、第2の取得画像を生成し、
g.前記第2の取得画像のうち、前記合成された顔候補領域のセットにおける領域に対応した領域に関して、
h.インテグラルイメージを演算し、
i.確定された顔領域のセットと、不採用の顔領域のセットとを得るために、インテグラルイメージの各合成領域に対して、可変サイズの顔検出を行う、
ことを特徴とする画像処理装置。 - 前記画像処理装置は、デジタルスチルカメラ、ビデオカメラ、画像取得メカニズムを備えた携帯電話若しくは、内蔵カメラ若しくは外付けカメラを備えた携帯コンピュータ又は、これらの組み合わせであることを特徴とする請求項28に記載の画像処理装置。
- デジタル画像取得装置を用いて、画像ストリームにおける顔を認識する方法であって、
a.認識される複数の顔のそれぞれに対して、識別子および関連するパラメータを有するデータベースを提供し、
b.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
c.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
d.前記サブサンプリング画像の少なくとも一部に対して、対応するインテグラルイメージを演算し、
e.任意のサイズおよび位置を有する1つ又は複数の顔候補領域のセットを得るために、前記インテグラルイメージの少なくとも一部分に対して顔検出を行い、
f.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記取得画像をサブサンプリングするための解像度を調節し、
g.複数の前記顔候補領域の少なくとも一部に対して、前記データベースを用いた顔認識を選択的に行い、
h.少なくとも1つの前記顔候補領域で認識された顔に対して識別子を与え、
i.前記画像ストリームにおける少なくとも1つの画像とともに、前記認識された顔の前記識別子を記憶し、
j.前記認識された顔の前記識別子に基づいて、各顔候補領域に対して信頼性レベルを与えるとともに、所定の閾値よりも高い前記信頼性レベルを有する前記顔候補領域に対してのみ顔認識を行うことを特徴とする方法。 - b〜iの処理を繰り返し行うことを特徴とする請求項30に記載の方法。
- 前記画像ストリームにおけるフル解像度の画像とともに、前記識別子を記憶することを特徴とする請求項30に記載の方法。
- 1つ又は複数のプロセッサと、認識される複数の顔のそれぞれに対する識別子および関連するパラメータを有するデータベースと、画像ストリームにおいて顔を認識する反復方法を前記プロセッサに実行させるプログラムが組み込まれ、デジタルコード化された命令を含む1つ又は複数のデジタル記録媒体と、を備えた画像処理装置において、
前記方法は、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記サブサンプリング画像の少なくとも一部に対して、対応するインテグラルイメージを演算し、
d.前記インテグラルイメージの少なくとも一部に対して、任意のサイズおよび位置を有する1又は複数の顔候補領域のセットを得るために、顔検出を行い、
e.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節するものであって、
f.前記顔候補領域で認識された顔に対して識別子を与えるために、複数の前記顔候補領域の少なくとも一部に対して、前記データベースを用いた顔認識を選択的に行い、
g.前記画像ストリームにおける少なくとも1つの画像とともに、前記認識された顔の前記識別子を記憶し、
h.前記認識された顔の前記識別子に基づいて、各顔候補領域に対して信頼性レベルを与えるとともに、所定の閾値よりも高い前記信頼性レベルを有する前記顔候補領域に対してのみ前記顔認識を行うことを特徴とする画像処理装置。 - デジタル画像取得装置を用いて画像ストリームにおける顔を検出する方法であって、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記第1の取得画像のうち、大部分で肌の色合いを含む1つ又は複数の前記顔領域を識別し、
d.前記サブサンプリングされた第1の取得画像のうち、肌の色合いを含む複数の領域の少なくとも一部に対して、対応するインテグラルイメージを演算し、
e.任意のサイズおよび位置を有する1つ又は複数の顔候補領域のセットを得るために、前記インテグラルイメージの少なくとも一部に対して顔検出を行い、
f.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節するものであって、
前記デジタル画像取得装置の顔検出モードにおいて、少なくとも1つの前記顔候補領域が検出されるまで、露出パラメータを徐々に増加させながら新規の前記第1の画像を取得する、
ことを特徴とする方法。 - aからfの処理を繰り返し行うことを特徴とする請求項34に記載の方法。
- 前記サブサンプリング画像に対して、前記識別が行われることを特徴とする請求項34に記載の方法。
- 前記顔検出は、緩和された顔検出パラメータを用いて行われることを特徴とする請求項34に記載の方法。
- 前回の画像に関連した前記顔候補領域に対して、前記第1の取得画像における対応領域の輝度特性のコントラストを強調することを特徴とする請求項34に記載の方法。
- 前記強調は、前記サブサンプリング画像に対して行われることを特徴とする請求項38に記載の方法。
- 前記強調は、前記インテグラルイメージの演算時に行われることを特徴とする請求項38に記載の方法。
- 1つ又は複数のプロセッサと、画像ストリームにおいて顔を検出する反復方法を前記プロセッサに実行させるプログラムが組み込まれ、デジタルコード化された命令を含む1つ又は複数のデジタル記録媒体と、を備えた画像処理装置において、
前記方法は、
a.前記画像ストリームから、1つ又は複数の顔領域を含む第1の取得画像を取り込み、
b.前記第1の取得画像に対して、特定の解像度でサブサンプリングを行うことで、サブサンプリング画像を生成し、
c.前記第1の取得画像のうち、大部分で肌の色合いを含む1つ又は複数の領域を識別し、
d.前記サブサンプリング画像のうち、肌の色合いを含む複数の領域の少なくとも一部に対して、対応するインテグラルイメージを演算し、
e.任意のサイズおよび位置を有する顔候補領域のセットを得るために、前記インテグラルイメージの少なくとも一部に対して顔検出を行い、
f.前記顔候補領域における前記任意のサイズおよび各位置の少なくとも一部に応じて、次回の前記第1の取得画像をサブサンプリングするための解像度を調節するものであって、
前記デジタル画像取得装置の顔検出モードにおいて、少なくとも1つの前記顔候補領域が検出されるまで、露出パラメータを徐々に増加させながら新規の前記第1の画像を取得する、
ことを特徴とする画像処理装置。
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