JP2010152162A5 - Automatic focus detection apparatus, control method therefor, and imaging apparatus - Google Patents
Automatic focus detection apparatus, control method therefor, and imaging apparatus Download PDFInfo
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本発明は自動焦点検出装置及びその制御方法、撮像装置に関し、特に撮像された画像から取得されたＡＦ評価値に基づく自動焦点検出制御を行う自動焦点検出装置及びその制御方法、撮像装置に関する。 The present invention relates to an automatic focus detection apparatus, a control method thereof, and an imaging apparatus , and more particularly to an automatic focus detection apparatus that performs automatic focus detection control based on an AF evaluation value acquired from a captured image , a control method thereof , and an imaging apparatus .
本発明は、このような従来技術の課題に鑑みてなされたものであり、ＴＶ−ＡＦ方式の自動焦点検出制御を行う自動焦点検出装置及びその制御方法、撮像装置において、被写体距離が変化した場合における自動焦点検出速度を向上させることを目的の１つとする。 The present invention has been made in view of the above-described problems of the prior art. In the automatic focus detection apparatus, the control method thereof , and the imaging apparatus for performing the automatic focus detection control of the TV-AF method, the subject distance is changed. One of the purposes is to improve the automatic focus detection speed in the.
上述の目的は、撮像された画像から取得したＡＦ評価値に基づいてフォーカスレンズを駆動し、自動焦点検出制御を行う自動焦点検出装置であって、撮像された画像から、予め定められた被写体を検出する検出手段と、検出手段による検出結果に基づいて、被写体の接近を判別する判別手段と、設定された焦点検出領域に対応する画像の領域からＡＦ評価値を生成する生成手段と、ＡＦ評価値に基づいて、フォーカスレンズを駆動する制御手段とを有し、制御手段は、判別手段により被写体の接近が判別された場合には、被写体の接近が判別されない場合よりもフォーカスレンズの単位駆動量もしくは駆動速度の少なくとも一方を増加させることを特徴とする自動焦点検出装置によって達成される。 The above-described object is an automatic focus detection apparatus that performs automatic focus detection control by driving a focus lens based on an AF evaluation value acquired from a captured image, and a predetermined subject is detected from the captured image. a detecting means for detecting that, based on the detection result by the detecting means, a discriminating means for discriminating the approach of the object, and generating means for generating an AF evaluation value from the region of the image corresponding to the focus detection area is set, AF And a control unit that drives the focus lens based on the evaluation value. The control unit drives the focus lens more when the approach of the subject is determined by the determination unit than when the approach of the subject is not determined. This is achieved by an automatic focus detection device characterized by increasing at least one of quantity or driving speed.
また、上述の目的は、撮像された画像から取得したＡＦ評価値に基づいてフォーカスレンズを駆動し、自動焦点検出制御を行う自動焦点検出装置の制御方法であって、撮像された画像から、予め定められた被写体を検出する検出ステップと、検出ステップにおける検出結果に基づいて、被写体の接近を判別する判別ステップと、設定された焦点検出領域に対応する画像の領域からＡＦ評価値を生成する生成ステップと、ＡＦ評価値に基づいて、フォーカスレンズを駆動する制御ステップとを有し、制御ステップでは、判別ステップにおいて被写体の接近が判別された場合には、被写体の接近が判別されない場合よりもフォーカスレンズの単位駆動量もしくは駆動速度の少なくとも一方を増加させることを特徴とする自動焦点検出装置の制御方法によっても達成される。 Another object of the present invention is to provide a control method for an automatic focus detection device that performs automatic focus detection control by driving a focus lens based on an AF evaluation value acquired from a captured image. a detection step of detecting an object that is determined, based on the detection result of the detecting step, generating a discrimination step for discriminating the approach of the subject, the AF evaluation value from the region of the image corresponding to the focus detection area is set And a control step for driving the focus lens based on the AF evaluation value. In the control step, when the approach of the subject is determined in the determination step, the approach of the subject is not determined. Control method of automatic focus detection device characterized by increasing at least one of unit driving amount or driving speed of focus lens Also it is achieved by.
このような構成により、本発明によれば、ＴＶ−ＡＦ方式の自動焦点検出制御を行う自動焦点検出装置及びその制御方法、撮像装置において、被写体距離が変化した場合における自動焦点検出速度を向上させることができる。 With such a configuration, according to the present invention, an automatic focus detection device that performs TV-AF automatic focus detection control, a control method thereof , and an imaging device improve the automatic focus detection speed when the subject distance changes. be able to.
Claims (6)
前記撮像された画像から、予め定められた被写体を検出する検出手段と、
前記検出手段による検出結果に基づいて、前記被写体の接近を判別する判別手段と、
設定された焦点検出領域に対応する前記画像の領域からＡＦ評価値を生成する生成手段と、
前記ＡＦ評価値に基づいて、前記フォーカスレンズを駆動する制御手段とを有し、
前記制御手段は、前記判別手段により前記被写体の接近が判別された場合には、前記被写体の接近が判別されない場合よりも前記フォーカスレンズの単位駆動量もしくは駆動速度の少なくとも一方を増加させることを特徴とする自動焦点検出装置。 An automatic focus detection device that drives a focus lens based on an AF evaluation value acquired from a captured image and performs automatic focus detection control,
Detecting means for detecting a predetermined subject from the captured image;
Discrimination means for discriminating the approach of the subject based on the detection result by the detection means;
Generating means for generating an AF evaluation value from the region of the image corresponding to the set is the focus detection regions,
Control means for driving the focus lens based on the AF evaluation value;
The control unit increases at least one of the unit driving amount and the driving speed of the focus lens when the approach of the subject is determined by the determination unit, compared to the case where the approach of the subject is not determined. Automatic focus detection device.
前記判別手段が、前記画像の前記顔に対応する領域の大きさが連続的に増加している場合に前記被写体の接近を判別することを特徴とする請求項１乃至請求項３のいずれか１項に記載の自動焦点検出装置。 The detection means, as the object scene body said predetermined detects a face of a person,
4. The method according to claim 1, wherein the determination unit determines approach of the subject when a size of a region corresponding to the face of the image continuously increases. 5. The automatic focus detection apparatus according to the item.
前記光学系で結像された被写体像を撮像し、撮像された画像を出力する撮像素子と、
請求項１乃至請求項４のいずれか１項に記載の自動焦点検出装置とを有することを特徴とする撮像装置。 An optical system having a focus lens;
An image sensor that captures a subject image formed by the optical system and outputs the captured image;
An image pickup apparatus comprising the automatic focus detection apparatus according to claim 1.
自動焦点検出装置の検出手段が、前記撮像された画像から、予め定められた被写体を検出する検出ステップと、
自動焦点検出装置の判別手段が、前記検出ステップにおける検出結果に基づいて、前記被写体の接近を判別する判別ステップと、
自動焦点検出装置の生成手段が、設定された焦点検出領域に対応する前記画像の領域からＡＦ評価値を生成する生成ステップと、
自動焦点検出装置の制御手段が、前記ＡＦ評価値に基づいて、前記フォーカスレンズを駆動する制御ステップとを有し、
前記制御ステップで前記制御手段は、前記判別ステップにおいて前記被写体の接近が判別された場合には、前記被写体の接近が判別されない場合よりも前記フォーカスレンズの単位駆動量もしくは駆動速度の少なくとも一方を増加させることを特徴とする自動焦点検出装置の制御方法。 A control method of an automatic focus detection device that drives a focus lens based on an AF evaluation value acquired from a captured image and performs automatic focus detection control,
A detection step in which a detection unit of the automatic focus detection device detects a predetermined subject from the captured image;
A discriminating step in which the discriminating means of the automatic focus detecting device discriminates the approach of the subject based on the detection result in the detecting step;
A generation step of generating an AF evaluation value from a region of the image corresponding to the set focus detection region by a generation unit of the automatic focus detection device ;
The control means of the automatic focus detection device has a control step of driving the focus lens based on the AF evaluation value;
In the control step, the control means increases at least one of the unit driving amount or the driving speed of the focus lens when the approach of the subject is determined in the determination step than when the approach of the subject is not determined. A method for controlling an automatic focus detection apparatus, comprising:
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| JP5894440B2 (en) * | 2012-01-05 | 2016-03-30 | キヤノン株式会社 | Focus adjustment device |
| JP6053287B2 (en) * | 2012-01-06 | 2016-12-27 | キヤノン株式会社 | Automatic focusing apparatus and automatic focusing method |
| JP6241791B2 (en) * | 2012-03-15 | 2017-12-06 | パナソニックＩｐマネジメント株式会社 | Autofocus device and imaging device |
| CN104919791A (en) * | 2013-01-09 | 2015-09-16 | 索尼公司 | Image processing device, image processing method and program |
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| JP3557222B2 (en) * | 1992-04-28 | 2004-08-25 | オリンパス株式会社 | Automatic focusing device |
| JPH0698234A (en) * | 1992-09-10 | 1994-04-08 | Canon Inc | Camera |
| JP2008046181A (en) * | 2006-08-11 | 2008-02-28 | Sony Corp | Focus controller, focus control method, imaging apparatus and program |
| JP2008052225A (en) * | 2006-08-28 | 2008-03-06 | Olympus Imaging Corp | Camera, focus control method, and program |
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