JPS58209704A - Focusing point detector - Google Patents
Focusing point detectorInfo
- Publication number
- JPS58209704A JPS58209704A JP9266582A JP9266582A JPS58209704A JP S58209704 A JPS58209704 A JP S58209704A JP 9266582 A JP9266582 A JP 9266582A JP 9266582 A JP9266582 A JP 9266582A JP S58209704 A JPS58209704 A JP S58209704A
- Authority
- JP
- Japan
- Prior art keywords
- light
- output signals
- signal
- photodetectors
- focus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は合焦点検出装置に関し、−助詳細には合焦点
対象物の周囲に存在する物体の受光部への結像が焦点検
出処理に際して受光部からノイズ信号として出力される
場合に、このノイズ信号を排除して測距対象物の結像に
より出力される信号を極力取り入れて焦点検出処理する
ことによって、周囲物体が存在しても高精度測距ができ
る合焦点検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a focused point detection device, and more specifically, an image formed on a light receiving section of an object existing around an object in focus is output as a noise signal from the light receiving section during focus detection processing. By eliminating this noise signal and incorporating as much of the signal output from the imaging of the object as possible for focus detection processing, we can create a focused point that allows high-precision distance measurement even when surrounding objects are present. This invention relates to a detection device.
従来、例えばラインセンサとも称されるCCD 。Conventionally, for example, a CCD is also called a line sensor.
フォトダイオードアレイ等の自己走査型受光素子にあっ
ては、合焦対象物が比較的小さく、シかも周囲に距離の
異なる物体が存在する場合には、この周囲の物体の受光
部への結像がノイズ信号となって合焦誤差につながる。In the case of self-scanning light receiving elements such as photodiode arrays, when the object to be focused on is relatively small and there are objects at different distances around it, it is difficult to image the surrounding objects on the light receiving section. becomes a noise signal and leads to focusing errors.
これを解決するためには少数の受光素子によって受光部
を構成すればよいが、分解能の低下が問題となり、受光
素子を極小化すればよいが現在の段階では技術的にもコ
スト的にも困難である。In order to solve this problem, it is possible to configure the light receiving section with a small number of light receiving elements, but this poses a problem of reduced resolution, and although it would be possible to minimize the number of light receiving elements, it is difficult at the current stage due to both technical and cost considerations. It is.
この発明の目的は、被写体の状態によって、合焦点対象
物の周囲に異なる距離の物体が存在し、これらの全体が
受光部に結像するような場合に、合焦点対象物の結像に
対応する受光素子の信号のみを採用し、他のイコ号を不
採用とすることとし、また同程度の出力信号が得られる
限り幅広い資料を用いて演算して測距精度の向上を得る
ことができる、多数の受光素子から成る受光部に、光学
系により被写体の像を結像し、受光素子の出力アナログ
信号を取り出してA/D変換器、マイクロコンピュータ
を含む焦点検出装置を経て合焦検出を行う装置において
、受光素子群のうち数個の基準受光素子に連なって並ぶ
連接受光素子のそれぞれの出力信号が基準受光素子の出
力信号と同程度である範囲に限って、該範囲内に含まれ
る基準受光素子および連接受光素子の出力信号を処理し
、他の出力信号を省くようにマイクロコンピュータを設
定したことを特徴とする合焦点検出装置を提供するにあ
る。以下この発明の実施例を図面を参照して詳細に説明
する。The purpose of this invention is to support imaging of the focused target when there are objects at different distances around the focused target depending on the state of the subject, and all of these objects are imaged on the light receiving section. It is possible to improve the distance measurement accuracy by using only the signal of the light receiving element that corresponds to the distance and not using other equal signals, and by using a wide range of materials as long as the same level of output signal can be obtained. , an image of the subject is formed by an optical system on a light-receiving section consisting of a large number of light-receiving elements, and an analog signal output from the light-receiving element is extracted and sent to a focus detection device including an A/D converter and a microcomputer to detect focus. In the device that performs this, only the range in which the output signal of each of the connected light-receiving elements that are lined up in series with several reference light-receiving elements among the light-receiving element group is comparable to the output signal of the reference light-receiving element is included in the range. It is an object of the present invention to provide a focused point detection device characterized in that a microcomputer is set to process output signals of a reference light receiving element and a continuous light receiving element and omit other output signals. Embodiments of the present invention will be described in detail below with reference to the drawings.
第1図において、1はCCDで光センサ部、積分機能部
、シフトレジスタ部等から成り、測距用アナログ信号を
シフトレジスタ部から順次取り出すことができる。In FIG. 1, reference numeral 1 denotes a CCD comprising a light sensor section, an integral function section, a shift register section, etc., from which analog signals for distance measurement can be sequentially taken out.
なおこのCCD 1は撮像光学系とは別個設けられた測
距光学系に組み込まれているものである。そ光学系のフ
ォーカスレンズによって結像する被写体のパターンより
も拡大された像、例えば撮像光学系にズームレンズが組
み込まれている場合にそのテレ位置における像と同程度
の大きさの像が入光するように測距光学系を設定するの
が好ましい。Note that this CCD 1 is incorporated in a distance measuring optical system provided separately from the imaging optical system. An image that is magnified than the pattern of the subject that is imaged by the focus lens of the optical system, for example, if a zoom lens is incorporated in the imaging optical system, an image that is about the same size as the image at the telephoto position is incident. It is preferable to set the distance measuring optical system so that
2はアナログ信号処理装置で、マスキングされた基準セ
ンサのダークカレン1−信号とセンサ信号との差をリフ
7ランスレベルとして取り出す機能や自動利得側部回路
(AGC)を含んでいる。Reference numeral 2 denotes an analog signal processing device, which includes a function of extracting the difference between the masked reference sensor's dark current 1 signal and the sensor signal as a reflex level, and an automatic gain side circuit (AGC).
3はA/D変換よ1でアナログ信号をマイコン処理する
ためにデジタル信号に変換する。3 is an A/D conversion and 1 converts an analog signal into a digital signal for microcomputer processing.
4はマイクロコンピュータで、光軸近傍の複数個の基準
受光素子の出力信号を基準として、基準受光素子の左右
に連なって並ぶ連接受光素子のそれぞれの出力信号が基
準受光素子の出力信号と同程度である限り、連接受光素
子の出方信号を順次拾っていき、基準受光素子の出方信
号と比較して許容範囲を越える差のある連接受光素子か
ら後の、基準受光素子より遠ざかる位置にある連接受光
素子の出力信号はオミットするようにして、基準受光素
子を含めて、これと同程度の連接受光素子の出力信号の
範囲で演算処理するようにプログラムされている。Reference numeral 4 is a microcomputer that uses the output signals of a plurality of reference light receiving elements near the optical axis as a reference, and determines that each output signal of the connected light receiving elements arranged on the left and right sides of the reference light receiving element is equal to the output signal of the reference light receiving element. As long as , the output signals of the connected light-receiving elements are sequentially picked up and compared with the output signals of the reference light-receiving element. It is programmed to omit the output signals of the connected light-receiving elements, and to perform arithmetic processing within the range of the output signals of the connected light-receiving elements, which are equivalent to the reference light-receiving element.
5はフォーカスポジションスイッチで、測距信号を焦点
距離制御用モータ6の操作信号に演算するためのもので
ある。Reference numeral 5 denotes a focus position switch for calculating a distance measurement signal into an operation signal for the focal length control motor 6.
この実施例による合焦点検出装置は以上のように構成さ
れているので、例えば第2図のように人物の顔7を合焦
点対象物としてとらえた場合、顔7の左右にある遠距離
の山8と中距離の家9が全部受光部に結像するときは、
マイクロコンピュータ4の演算の段階で、顔7の結像に
よる出力信号のみを採用して、他の山8や家9の結像に
よる出力信号はオミットし、演算された測距信号はフォ
ーカスポジションスイッチ5の作用によってモータの操
作信号に蔭換され、焦点距離制御用モータ6を撮像光学
系および測距光学系が合焦状態になる位置まで駆動する
。Since the in-focus point detection device according to this embodiment is configured as described above, for example, when a person's face 7 is captured as an in-focus object as shown in FIG. 8 and a house 9 at a middle distance are all focused on the light receiving section,
At the calculation stage of the microcomputer 4, only the output signal from the image of the face 7 is adopted, the output signals from the images of the other mountains 8 and the house 9 are omitted, and the calculated distance measurement signal is sent to the focus position switch. 5, the focal length control motor 6 is driven to a position where the imaging optical system and the distance measuring optical system are brought into focus.
以上のようにこの発明に係る合焦点検出装置によれば合
焦点対象物の測距信号のみをデータとすることができ、
しかも同一程度の出力の最多数のデータを処理するため
、測距精度の高い合焦点検出ができ、低置なコストで製
造できる等の著効を′奏する。As described above, according to the in-focus point detection device according to the present invention, only the distance measurement signal of the in-focus object can be used as data,
Moreover, since the maximum number of data of the same level of output is processed, it is possible to detect a focused point with high distance measurement accuracy, and it has great effects such as being able to be manufactured at a low cost.
以上、本発明につき好適な実施例を挙げて種々説明して
きたが、本発明はこの実施例に限定されるものではなく
、発明の精神を逸脱しない範囲内で多くの改安を施し得
るのはもちろんのことである。The present invention has been variously explained above with reference to preferred embodiments, but the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.
図面はこの発明の一実施例を示し、第1図はそのブロッ
ク説明図、第2図は受光部への被写体の結像状態を示す
説明図である。
1・・・・ccn、 2・・・・アナログ信号処理装
置。
3・・・・A/D変換器、 4・・・・マイクロコンピ
ュータ、 5・・・・フォーカスポジションスイッチ
。
6・・・・焦点距離制部用モータ、 7・・・・顔。
8・・・・山、 9・・・・家。The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram thereof, and FIG. 2 is an explanatory diagram showing the state of image formation of a subject on a light receiving section. 1...ccn, 2...analog signal processing device. 3... A/D converter, 4... Microcomputer, 5... Focus position switch. 6...Focal length control motor, 7...Face. 8...Mountain, 9...House.
Claims (1)
被写体の像を結像し、受光素子の出力アナログ信号を取
り出してA/D変換器、マイクロコンピュータを含む焦
点検出処理装置を経て合焦検出を行う装置において、受
光素子群のうち数個の基準受光素子に連なって並ぶ連接
受光素子のそれぞれの出力信号が基準受光素子の出力信
号と同程度である範囲に限って、該範囲内に含まれる基
準受光素子および連接受光素子の出力信号を処理し、他
の出力信号を省くようにマイクロコンピュータを設定し
たことを特徴とする合焦点検出装置。10. An image of the subject is formed by an optical system on a light-receiving section consisting of a large number of light-receiving elements, and an analog signal output from the light-receiving element is extracted and sent through a focus detection processing device including an A/D converter and a microcomputer to detect focus. In the device that performs this, only the range in which the output signal of each of the connected light-receiving elements that are lined up in series with several reference light-receiving elements among the light-receiving element group is comparable to the output signal of the reference light-receiving element is included in the range. A focused point detection device characterized in that a microcomputer is set to process output signals of a reference light receiving element and a continuous light receiving element and omit other output signals.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9266582A JPS58209704A (en) | 1982-05-31 | 1982-05-31 | Focusing point detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9266582A JPS58209704A (en) | 1982-05-31 | 1982-05-31 | Focusing point detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58209704A true JPS58209704A (en) | 1983-12-06 |
Family
ID=14060767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9266582A Pending JPS58209704A (en) | 1982-05-31 | 1982-05-31 | Focusing point detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58209704A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0540036A (en) * | 1991-06-07 | 1993-02-19 | Nikon Corp | Focus detecting device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5487241A (en) * | 1977-12-22 | 1979-07-11 | Toa Medical Electronics | Automatic focus adjusting device of microscope |
-
1982
- 1982-05-31 JP JP9266582A patent/JPS58209704A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5487241A (en) * | 1977-12-22 | 1979-07-11 | Toa Medical Electronics | Automatic focus adjusting device of microscope |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0540036A (en) * | 1991-06-07 | 1993-02-19 | Nikon Corp | Focus detecting device |
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