JP2014203049A5 - Focus adjustment apparatus and control method thereof - Google Patents
Focus adjustment apparatus and control method thereof Download PDFInfo
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- JP2014203049A5 JP2014203049A5 JP2013081659A JP2013081659A JP2014203049A5 JP 2014203049 A5 JP2014203049 A5 JP 2014203049A5 JP 2013081659 A JP2013081659 A JP 2013081659A JP 2013081659 A JP2013081659 A JP 2013081659A JP 2014203049 A5 JP2014203049 A5 JP 2014203049A5
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- 238000001514 detection method Methods 0.000 claims description 11
- 102000003743 Relaxin Human genes 0.000 claims description 9
- 108090000103 Relaxin Proteins 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 claims description 5
- 230000001429 stepping Effects 0.000 claims description 3
- 230000035943 smell Effects 0.000 claims 2
- 102000004083 Lymphotoxin-alpha Human genes 0.000 claims 1
- 108090000542 Lymphotoxin-alpha Proteins 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Description
本発明は、焦点調節装置およびその制御方法に関し、特に撮像面位相差ＡＦによる焦点調節技術に関する。 The present invention relates to a focus adjustment device and a control method therefor, and more particularly to a focus adjustment technique based on imaging plane phase difference AF.
上述の目的は、位相差検出方式の自動焦点調節に用いる像信号を生成可能な撮像素子と、像信号に基づいて、デフォーカス量を検出する検出手段と、デフォーカス量に基づいて、フォーカスレンズの駆動を制御する制御手段と、を有し、制御手段は、像信号に基づく信頼性が所定の信頼性より高い場合にはデフォーカス量に基づいてフォーカスレンズが駆動されるようにフォーカスレンズの駆動を制御し、前記信頼性が所定の信頼性より高くない場合にはフォーカスレンズを所定単位ずつ駆動するステップ駆動によりフォーカスレンズが駆動されるようにフォーカスレンズの駆動を制御することを特徴とする焦点調節装置によって達成される。 The above objects, and capable of generating the image pickup device an image signal to be used for automatic focusing of the phase difference detection method, based on the image signal, and detecting means for detecting the defocus amount, based on the defocus amount, the focusing lens Control means for controlling the driving of the focus lens so that the focus lens is driven based on the defocus amount when the reliability based on the image signal is higher than a predetermined reliability. controls the drive, before wherein the relaxin dependable is to control the drive of the focus lens so that the focus lens is driven by a stepping drive which drives the focus lens by a predetermined unit when not higher than the predetermined reliability Is achieved by a focusing device.
（第１の実施形態）
図１は、本発明の第１の実施形態に係る焦点調節装置を適用可能な撮像装置の一例としてのレンズ交換式カメラの機能構成例を示すブロック図である。
撮像装置は交換可能なレンズユニット１０及びカメラ本体２０から構成されている。レンズ全体の動作を統括制御するレンズ制御部１０６と、レンズユニット１０を含めたカメラシステム全体の動作を統括するカメラ制御部２１２とは、レンズマウントに設けられた端子を通じて相互に通信可能である。
(First embodiment)
FIG. 1 is a block diagram illustrating a functional configuration example of an interchangeable lens camera as an example of an imaging apparatus to which the focus adjustment apparatus according to the first embodiment of the present invention can be applied .
An imaging device is composed of interchangeable lens unit 10 and the camera body 20. The lens control unit 106 that controls the overall operation of the lens and the camera control unit 212 that controls the overall operation of the camera system including the lens unit 10 can communicate with each other through terminals provided on the lens mount.
以上説明したように、本実施形態に係る焦点調節装置は、撮像面位相差検出によって検出したデフォーカス量の信頼性情報に基づいて、ＡＦ制御時のフォーカスレンズ駆動方法を切り替える。信頼性が良いと判断される場合には検出したデフォーカス量を基にフォーカスレンズを駆動する。デフォーカス量の信頼性が悪い場合は、ステップ駆動量と駆動方向を設定し、ステップ駆動によってサーチ駆動を行う。そのため、フォーカスレンズの低速駆動が不可能なレンズで動画撮影を行う場合であっても、フォーカスレンズが短時間に大きく移動することを抑制でき、画質に与える悪影響を抑制可能である。また、移動が滑らかに行われているように見える、品位の良いフォーカスレンズの駆動が実現できる。 As described above, the focus adjustment device according to the present embodiment switches the focus lens driving method during AF control based on the defocus amount reliability information detected by the imaging plane phase difference detection. When it is determined that the reliability is good, the focus lens is driven based on the detected defocus amount. When the reliability of the defocus amount is poor, the step drive amount and the drive direction are set, and search drive is performed by step drive. Therefore, even when moving image shooting is performed with a lens that cannot be driven at a low speed, the focus lens can be prevented from moving greatly in a short time, and adverse effects on image quality can be suppressed. In addition, it is possible to drive a focus lens of high quality that appears to move smoothly.
Claims (14)
前記像信号に基づいて、デフォーカス量を検出する検出手段と、
前記デフォーカス量に基づいて、フォーカスレンズの駆動を制御する制御手段と、を有し、
前記制御手段は、前記像信号に基づく信頼性が所定の信頼性より高い場合には前記デフォーカス量に基づいて前記フォーカスレンズが駆動されるように前記フォーカスレンズの駆動を制御し、前記信頼性が前記所定の信頼性より高くない場合には前記フォーカスレンズを所定単位ずつ駆動するステップ駆動により前記フォーカスレンズが駆動されるように前記フォーカスレンズの駆動を制御することを特徴とする焦点調節装置。 An image sensor capable of generating an image signal used for automatic focus adjustment of a phase difference detection method;
Based on said image signal, detecting means for detecting the defocus amount,
Control means for controlling the driving of the focus lens based on the defocus amount ,
Wherein, reliability based on the image signal by controlling the drive of the focus lens so that the focus lens is driven based on the defocus amount is higher than a predetermined reliability, pre lymphotoxin focusing when Robustness is not higher than the predetermined reliability, characterized in that for controlling the driving of the focus lens so that the focus lens is driven by a stepping drive which drives the focus lens by a predetermined unit apparatus.
前記像信号に基づいて、デフォーカス量を検出する検出手段と、
前記デフォーカス量に基づいて、フォーカスレンズの駆動を制御する制御手段と、を有し、
前記制御手段は、前記フォーカスレンズを所定単位ずつ駆動するステップ駆動により前記フォーカスレンズが駆動されるように前記フォーカスレンズの駆動を制御し、前記像信号に基づく信頼性が所定値より高い第１の信頼性であれば第１の駆動量を、前記信頼性が前記所定値より高くない第２の信頼性であれば前記第１の駆動量よりも大きな第２の駆動量を、前記所定単位とするステップ駆動により前記フォーカスレンズが駆動されるように前記フォーカスレンズの駆動を制御することを特徴とする焦点調節装置。 An image sensor capable of generating an image signal used for automatic focus adjustment of a phase difference detection method;
Based on said image signal, detecting means for detecting the defocus amount,
Control means for controlling the driving of the focus lens based on the defocus amount ,
The control means controls the drive of the focus lens so that the focus lens is driven by step drive that drives the focus lens by a predetermined unit, and the reliability based on the image signal is higher than a predetermined value. a first drive amount when the reliability, the large second driving quantity than before the relaxin Robustness is the first drive amount when the second reliability not higher than the predetermined value, the predetermined A focus adjustment device that controls driving of the focus lens so that the focus lens is driven by step driving as a unit.
前記制御手段は、前記焦点検出領域の像高が高いほど、前記所定の信頼性を低く設定することを特徴とする請求項１から請求項１０のいずれか１項に記載の焦点調節装置。 The detection means detects the defocus amount based on the image signal obtained from a pixel included in a focus detection area among pixels included in the imaging element,
11. The focus adjustment apparatus according to claim 1, wherein the control unit sets the predetermined reliability to be lower as the image height of the focus detection area is higher.
前記像信号に基づいて、デフォーカス量を検出する検出工程と、
前記デフォーカス量に基づいて、フォーカスレンズの駆動を制御する制御工程とを有し、
前記制御工程において、前記像信号に基づく信頼性が所定の信頼性より高い場合には前記デフォーカス量に基づいて前記フォーカスレンズが駆動されるように前記フォーカスレンズの駆動を制御し、前記信頼性が前記所定の信頼性より高くない場合には前記フォーカスレンズを所定単位ずつ駆動するステップ駆動により前記フォーカスレンズが駆動されるように前記フォーカスレンズの駆動を制御することを特徴とする焦点調節装置の制御方法。 A control method of a focus adjustment apparatus having an image sensor capable of generating an image signal used for phase difference detection type automatic focus adjustment,
Based on the prior Kizo signal, a detection step of detecting a defocus amount,
A control step of controlling the driving of the focus lens based on the defocus amount ,
Wherein said control step smell Te, reliability based on the image signal by controlling the drive of the focus lens so that the focus lens is driven based on the defocus amount is higher than a predetermined reliability, pre Symbol focus when reliability is not higher than the predetermined reliability, characterized in that for controlling the driving of the focus lens so that the focus lens is driven by a stepping drive which drives the focus lens by a predetermined unit Control method of the adjusting device.
前記像信号に基づいて、デフォーカス量を検出する検出工程と、
前記デフォーカス量に基づいて、フォーカスレンズの駆動を制御する制御工程とを有し、
前記制御工程において、前記フォーカスレンズを所定単位ずつ駆動するステップ駆動により前記フォーカスレンズが駆動されるように前記フォーカスレンズの駆動を制御し、前記像信号に基づく信頼性が所定値より高い第１の信頼性であれば第１の駆動量を、前記信頼性が前記所定値より高くない第２の信頼性であれば前記第１の駆動量よりも大きな第２の駆動量を、前記所定単位とするステップ駆動により前記フォーカスレンズが駆動されるように前記フォーカスレンズの駆動を制御することを特徴とする焦点調節装置の制御方法。 A control method of a focus adjustment apparatus having an image sensor capable of generating an image signal used for phase difference detection type automatic focus adjustment,
Based on the prior Kizo signal, a detection step of detecting a defocus amount,
A control step of controlling the driving of the focus lens based on the defocus amount ,
Wherein said control step Te smell, the focus lens the focus lens by controlling the driving of the focus lens to be driven by the step driving of driving by the predetermined units, the image first reliability is higher than a predetermined value based on the signal of the first drive amount when the reliability, the large second driving amount than the first drive amount when the second reliability before relaxin Robustness is not higher than the predetermined value, the A method for controlling a focus adjusting apparatus, wherein the focus lens is driven so that the focus lens is driven by step driving in a predetermined unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013081659A JP6238547B2 (en) | 2013-04-09 | 2013-04-09 | Focus adjustment apparatus and control method thereof |
| US14/248,494 US9338344B2 (en) | 2013-04-09 | 2014-04-09 | Focusing apparatus and method for controlling the same, and image pickup apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2013081659A JP6238547B2 (en) | 2013-04-09 | 2013-04-09 | Focus adjustment apparatus and control method thereof |
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| JP2014203049A JP2014203049A (en) | 2014-10-27 |
| JP2014203049A5 true JP2014203049A5 (en) | 2016-05-26 |
| JP6238547B2 JP6238547B2 (en) | 2017-11-29 |
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| JP6581362B2 (en) * | 2015-01-14 | 2019-09-25 | キヤノン株式会社 | AUTOFOCUS DEVICE, ITS CONTROL METHOD, PROGRAM, AND RECORDING MEDIUM |
| US9910247B2 (en) * | 2016-01-21 | 2018-03-06 | Qualcomm Incorporated | Focus hunting prevention for phase detection auto focus (AF) |
| JP7207296B2 (en) * | 2017-03-30 | 2023-01-18 | ソニーグループ株式会社 | IMAGING DEVICE, FOCUS CONTROL METHOD, AND FOCUS DETERMINATION METHOD |
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| JP3963568B2 (en) * | 1997-05-28 | 2007-08-22 | オリンパス株式会社 | Camera autofocus device |
| JP5089098B2 (en) * | 2006-07-25 | 2012-12-05 | キヤノン株式会社 | Focus adjustment device, imaging device, and control method |
| US8121470B2 (en) * | 2006-07-25 | 2012-02-21 | Canon Kabushiki Kaisha | Focusing device, image pick-up apparatus, and control method |
| JP4943769B2 (en) * | 2006-08-15 | 2012-05-30 | 富士フイルム株式会社 | Imaging apparatus and in-focus position search method |
| JP5288752B2 (en) * | 2007-09-07 | 2013-09-11 | キヤノン株式会社 | Imaging device |
| JP5366643B2 (en) * | 2009-04-28 | 2013-12-11 | キヤノン株式会社 | Imaging device |
| JP5561246B2 (en) * | 2011-06-29 | 2014-07-30 | 株式会社ニコン | Focus adjustment device and imaging device provided with the same |
| JP5796388B2 (en) * | 2011-07-22 | 2015-10-21 | 株式会社ニコン | Focus detection apparatus and imaging apparatus |
| JP5891667B2 (en) * | 2011-09-15 | 2016-03-23 | 株式会社ニコン | Focus adjustment device and imaging device provided with the same |
| JP5891668B2 (en) * | 2011-09-15 | 2016-03-23 | 株式会社ニコン | Focus adjustment device and imaging device |
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