JPH05115029A - Automatic focusing device - Google Patents
Automatic focusing deviceInfo
- Publication number
- JPH05115029A JPH05115029A JP3273743A JP27374391A JPH05115029A JP H05115029 A JPH05115029 A JP H05115029A JP 3273743 A JP3273743 A JP 3273743A JP 27374391 A JP27374391 A JP 27374391A JP H05115029 A JPH05115029 A JP H05115029A
- Authority
- JP
- Japan
- Prior art keywords
- subject image
- video signal
- movement
- automatic focusing
- signal
- 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
Landscapes
- Automatic Focus Adjustment (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ビデオカメラの自動合
焦装置に係り、特に、動被写体に対する合焦性能向上、
追従性を向上した自動合焦装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic focusing device for a video camera, and more particularly, to improving focusing performance for a moving subject,
The present invention relates to an automatic focusing device having improved followability.
【０００２】[0002]
【従来の技術】映像信号の高域成分が最大になるよう
に、ピント調節部を制御する自動合焦装置については、
特開昭５８−１８８９６６号公報で論じられている。同
公報によると複数のバンドパスフィルタを用いて合焦性
能向上について言及している。しかし、手振れ、または
被写体の位置変動によって映像信号が乱れることによっ
て合焦性能が劣化することに関しては、論じられていな
い。2. Description of the Related Art An automatic focusing apparatus for controlling a focus adjusting section so that a high frequency component of a video signal is maximized,
This is discussed in JP-A-58-188966. According to the publication, focusing performance is improved by using a plurality of bandpass filters. However, it has not been discussed that the focusing performance is deteriorated due to the disturbance of the image signal due to the camera shake or the position change of the subject.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術では、被
写体像の変動によって、映像信号が乱れることに対し
て、対策されてないことが問題であった。従って、被写
体像が変動して映像信号が乱れた場合には、合焦動作を
一時停止するなど、映像の劣化を低減するする他に方法
がなかった。In the above-mentioned prior art, there is a problem that no measures are taken against the disturbance of the video signal due to the fluctuation of the subject image. Therefore, when the subject image fluctuates and the video signal is disturbed, there is no other method than reducing the deterioration of the video, such as temporarily stopping the focusing operation.
【０００４】本発明の目的は、映像信号が乱れた場合に
も、合焦性能の劣化を生じさせない自動合焦装置を提供
することにある。An object of the present invention is to provide an automatic focusing device which does not cause deterioration of focusing performance even when a video signal is disturbed.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、本発明は以下のような手段を考案した。映像信号の
内、目標とする被写体の位置を検出する手段と、映像信
号の中で、高域成分を抽出する範囲を設定するゲート手
段をもち、そのゲート手段で規定される映像信号のサン
プリング範囲に対する被写体像の位置を一定に保つ手段
によって構成される。被写体の位置を検出する手段とし
て、映像情報をメモリに記憶させ、メモリを用いたパタ
ーン検出手段によって被写体像の位置検出を行っても同
等の効果が期待できる。In order to achieve the above object, the present invention has devised the following means. It has a means for detecting the position of a target subject in the video signal and a gate means for setting a range for extracting a high frequency component in the video signal, and the sampling range of the video signal defined by the gate means. It is constituted by means for keeping the position of the subject image with respect to. As a means for detecting the position of the subject, the same effect can be expected even if the image information is stored in the memory and the position of the subject image is detected by the pattern detecting means using the memory.
【０００６】[0006]
【作用】合焦動作を行うための映像信号の検出方法とし
て、画面上の被写体像の高域信号成分を抽出する必要が
ある。その方法として、画面上の映像信号の水平成分を
通過させるためのゲート信号と、垂直成分を通過させる
ためのゲート信号を用いる。図２を用いて、本発明の動
作原理を説明する。被写体Ａを包含するようにサンプリ
ング範囲を設定する。この時の、被写体像の信号と、サ
ンプリングのためのゲート信号のタイミングを、図２の
画面図の枠外に示す。被写体Ａが、時間経過によって被
写体Ｂの位置に移動するときを想定する。被写体Ｂの位
置での水平成分と垂直成分の信号は、被写体Ａの時と同
じように信号波形より検出することことができる。従っ
て、被写体Ａでの信号Ｖに対するゲート信号Ｖの相対関
係を記憶しておき、被写体Ｂでの信号の垂直成分にたい
するゲート信号の垂直成分の相対位置関係を、等しくす
る。これによって、垂直ゲート信号に対する垂直信号成
分の位置は、変化しないことになる。垂直成分の被写体
移動について、上記したが、水平成分の被写体移動につ
いても、全く同様に考えることができる。即ち、被写体
が位置移動しても、自動合焦装置の検出する被写体の位
置は、変化しないことになる。従って、被写体が、サン
プリング範囲から、逃げようとしても、サンプリング範
囲が、追いかけるため、映像信号の高域成分が、乱され
ないので、振動、手振れに強い自動合焦装置を構築する
ことができる。As a method of detecting the video signal for performing the focusing operation, it is necessary to extract the high frequency signal component of the subject image on the screen. As its method, a gate signal for passing a horizontal component of a video signal on the screen and a gate signal for passing a vertical component are used. The operating principle of the present invention will be described with reference to FIG. The sampling range is set so as to include the subject A. The timing of the signal of the subject image and the timing of the gate signal for sampling at this time are shown outside the frame of the screen view of FIG. It is assumed that the subject A moves to the position of the subject B over time. The signals of the horizontal component and the vertical component at the position of the subject B can be detected from the signal waveform as in the case of the subject A. Therefore, the relative relationship of the gate signal V to the signal V of the subject A is stored, and the relative positional relationship of the vertical component of the gate signal to the vertical component of the signal of the subject B is made equal. As a result, the position of the vertical signal component with respect to the vertical gate signal does not change. The subject movement of the vertical component has been described above, but the subject movement of the horizontal component can be considered in exactly the same way. That is, even if the subject moves, the position of the subject detected by the automatic focusing device does not change. Therefore, even if the subject tries to escape from the sampling range, the sampling range follows the sampling range, so that the high-frequency component of the video signal is not disturbed, so that an automatic focusing device that is resistant to vibration and camera shake can be constructed.
【０００７】[0007]
【実施例】以下、本発明の一実施例を、図１により説明
する。図１において、１は合焦機構の付いたズームレン
ズ光学系、２は光学像を電気信号に変換するセンサ、３
は映像信号より被写体の映像パターンを検出するパター
ン検出器、４はパターン検出器３で検出したパターンの
移動方向及び位置を検出する移動検出器、５は移動検出
器４より得られる被写体像の移動情報より映像をサンプ
リングするゲート位置を制御するゲート回路であって、
映像信号の通過、不通過を制御する。６は合焦に用いる
映像信号の高域成分を抽出する高域成分検出器、７は高
域成分の変化量を判断し、自動合焦装置の合焦機構を制
御するモータの回転方向及び回転速度を出力するモータ
制御回路、８は合焦機構を制御するモータを駆動するモ
ータ駆動回路、９は映像信号の急激な変動を検出したと
きに自動合焦装置を停止する信号を出力する外乱検出
器、１０は被写体を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a zoom lens optical system with a focusing mechanism, 2 is a sensor for converting an optical image into an electric signal, 3
Is a pattern detector for detecting the image pattern of the subject from the image signal, 4 is a movement detector for detecting the movement direction and position of the pattern detected by the pattern detector 3, and 5 is movement of the subject image obtained by the movement detector 4. A gate circuit for controlling a gate position for sampling an image from information,
It controls the passage and non-passage of video signals. Reference numeral 6 is a high-frequency component detector that extracts high-frequency components of a video signal used for focusing, and 7 is a rotation direction and rotation of a motor that determines the amount of change in the high-frequency components and controls the focusing mechanism of the automatic focusing device. A motor control circuit that outputs a speed, 8 is a motor drive circuit that drives a motor that controls a focusing mechanism, and 9 is a disturbance detection that outputs a signal that stops the automatic focusing device when a rapid change in a video signal is detected. A container 10 indicates a subject.
【０００８】被写体を撮影すると，センサ２で光電変換
が行われ，映像信号として信号処理される。この信号を
ゲート回路５によって撮影画角によって規定される範囲
の信号が次の高域成分検出器６に伝達される。高域成分
検出器６は，常に高域成分が，最大になるようにモータ
を制御する信号を発生する。即ち，映像信号の最大にな
る様な，光学系の焦点位置調整を行うことによって自動
合焦装置を構成している。パターン検出器３は，手振れ
等によって，被写体像の，画面に対する位置ずれ量を，
補正するためのものである。即ち，画面に対する被写体
位置を，常に検出する。移動検出器４は，パターン検出
器３で検出した被写***置より，被写体の移動方向及び
量を，水平方向，垂直方向に分けて検出する。より具体
的にいえば，映像信号の水平走査期間と垂直走査期間の
ゲート期間を発生させるものである。When a subject is photographed, photoelectric conversion is performed by the sensor 2 and signal processing is performed as a video signal. This signal is transmitted by the gate circuit 5 to the next high frequency component detector 6 as a signal in the range defined by the photographing field angle. The high frequency component detector 6 always generates a signal for controlling the motor so that the high frequency component is maximized. That is, the automatic focusing device is configured by adjusting the focus position of the optical system so that the image signal is maximized. The pattern detector 3 calculates the amount of displacement of the subject image with respect to the screen due to camera shake or the like.
It is for correction. That is, the subject position with respect to the screen is always detected. The movement detector 4 detects the movement direction and amount of the subject separately from the subject position detected by the pattern detector 3 in the horizontal direction and the vertical direction. More specifically, the gate period of the horizontal scanning period and the vertical scanning period of the video signal is generated.
【０００９】外乱検出器９は，被写体の急激な移動等に
よって補正しきれない移動が生じたとき，たとえば，移
動検出器４の補正量の最大値を越えるような時に，自動
合焦装置を停止し，不安定動作を防止する。The disturbance detector 9 stops the automatic focusing device when a movement that cannot be corrected occurs due to a sudden movement of the subject, for example, when the maximum correction amount of the movement detector 4 is exceeded. To prevent unstable operation.
【００１０】この構成によって，被写***置が変動して
もゲート信号に対する映像信号の相対位置は，変化しな
いので，ゲート回路を通過する映像信号は、被写体の位
置が変化する前の映像信号と同等の信号が得られるた
め，安定した合焦動作の自動合焦装置が構築される。With this configuration, the relative position of the video signal with respect to the gate signal does not change even if the subject position changes, so that the video signal passing through the gate circuit is equivalent to the video signal before the subject position changed. Since a signal is obtained, an automatic focusing device with stable focusing operation is constructed.
【００１１】本発明の第二の実施例を図３，図４に示
す。図３において，１１は，被写体中の映像パターンの
サンプリング回路である。映像パターンのサンプリング
回路１１の動作を，図４により説明する。画面中の被写
体のパターンの特徴ある部分を抽出してサンプリングす
る。特徴の例として，輝度，コントラスト，色及び，そ
れらの組み合わせなどがある。映像パターンのサンプリ
ング数を被写体に応じて設定することによって，前述の
ゲートの設定精度を向上し，より安定した自動合焦装置
が構築される。A second embodiment of the present invention is shown in FIGS. In FIG. 3, reference numeral 11 is a sampling circuit for a video pattern in a subject. The operation of the video pattern sampling circuit 11 will be described with reference to FIG. A characteristic part of the pattern of the subject on the screen is extracted and sampled. Examples of features include brightness, contrast, color, and combinations thereof. By setting the number of samplings of the image pattern according to the subject, the above-mentioned gate setting accuracy is improved and a more stable automatic focusing device is constructed.
【００１２】また，映像信号を一度画像メモリ上に蓄積
した後，被写体パターンの移動量を別途設けた検出手段
で検出しても同様の効果が得られる。Further, the same effect can be obtained even if the moving amount of the subject pattern is detected by a separately provided detecting means after the video signal is once stored in the image memory.
【００１３】[0013]
【発明の効果】本発明によれば，手振れ等による画面上
の被写体変動に映像信号の高域成分の抽出範囲が自動的
に追従するので，素人にも安定した映像を得ることがで
きる。According to the present invention, the extraction range of the high frequency component of the video signal automatically follows the fluctuation of the subject on the screen due to camera shake or the like, so that even an amateur can obtain a stable video.
【図１】本発明の第一の実施例を示すブロック図、FIG. 1 is a block diagram showing a first embodiment of the present invention,
【図２】本発明の動作の説明のための原理図、FIG. 2 is a principle diagram for explaining the operation of the present invention,
【図３】本発明の第二の実施例を示すブロック図、FIG. 3 is a block diagram showing a second embodiment of the present invention,
【図４】本発明の第二の実施例の原理図。FIG. 4 is a principle diagram of a second embodiment of the present invention.
１…ズームレンズ光学系、 ２…センサ、 ３…パターン検出器、 ４…移動検出器、 ５…ゲート回路、 ６…高域成分検出器、 ７…モータ制御回路、 ８…モータ駆動回路、 ９…外乱検出器。 1 ... Zoom lens optical system, 2 ... Sensor, 3 ... Pattern detector, 4 ... Movement detector, 5 ... Gate circuit, 6 ... High frequency component detector, 7 ... Motor control circuit, 8 ... Motor drive circuit, 9 ... Disturbance detector.
Claims (7)
分が最大となるように光学系の合焦手段を制御して、合
焦動作を行う自動合焦装置において、映像信号の所定部
分の映像パターンを検出する手段と前記映像パターンの
水平、垂直方向の移動量を検出する手段と、合焦検出用
の映像信号をサンプリングする範囲を設定し、その範囲
の映像信号のみを通過するゲート手段をもち、被写体像
が水平、垂直方向の移動をした時に、被写体像の移動に
追従して、前記ゲート手段のサンプリング範囲を水平、
垂直方向に移動することにより、サンプリング範囲に対
する被写体像の相対位置をほぼ一定に保つようにしたこ
とを特徴とする自動合焦装置。1. An automatic focusing apparatus for detecting a high frequency component of a video signal and controlling a focusing means of an optical system so that the high frequency component is maximized to perform a focusing operation. A means for detecting the video pattern of a predetermined part, a means for detecting the amount of horizontal and vertical movement of the video pattern, a range for sampling the video signal for focus detection are set, and only the video signal in that range is passed. When the subject image moves in the horizontal and vertical directions, the sampling range of the gate means is set horizontally, following the movement of the subject image.
An automatic focusing device characterized in that the relative position of a subject image to a sampling range is kept substantially constant by moving in the vertical direction.
分が最大となるように光学系の合焦手段を制御して、合
焦動作を行う自動合焦装置において、水平、垂直成分の
映像情報を記憶するメモリと、メモリ上の映像情報よ
り、被写体像の水平、垂直成分の移動量と方向を検出す
る被写体像移動検出手段と、合焦検出用の映像信号をサ
ンプリングする範囲を設定し、その範囲の映像信号のみ
を通過するゲート手段をもち、前記被写体像が水平、垂
直方向の移動をした時に、前記被写体像の移動に追従し
て、前記ゲート手段のサンプリング範囲を水平、垂直方
向に移動することにより、前記サンプリング範囲に対す
る前記被写体像の相対位置をほぼ一定に保つようにした
ことを特徴とする自動合焦装置。2. An automatic focusing device which detects a high frequency component of a video signal and controls a focusing means of an optical system so that the high frequency component is maximized to perform a focusing operation in a horizontal or vertical direction. A memory for storing image information of the components, a subject image movement detecting means for detecting the movement amount and direction of the horizontal and vertical components of the subject image based on the image information on the memory, and a range for sampling the image signal for focus detection Is set, and when the subject image moves in the horizontal and vertical directions, the gate means that passes only the video signal in that range is set, and the sampling range of the gate means is set horizontally by following the movement of the subject image. An automatic focusing device characterized in that the relative position of the subject image with respect to the sampling range is kept substantially constant by moving in the vertical direction.
像情報より前記被写体像の水平、垂直成分の移動量と方
向を検出する前記被写体像移動検出手段として、前記被
写体像の所定位置の水平成分の変化量と垂直成分の変化
量を検出する方式を用いる自動合焦装置。3. The horizontal movement of a predetermined position of the subject image as the subject image movement detection means for detecting the movement amount and direction of the horizontal and vertical components of the subject image based on the video information on the memory. An automatic focusing device that uses a method that detects the amount of change in the component and the amount of change in the vertical component.
報より前記被写体像の水平、垂直成分の移動量と方向を
検出する前記被写体像移動検出手段を複数個設けた自動
合焦装置。4. An automatic focusing apparatus according to claim 3, wherein a plurality of subject image movement detecting means for detecting the movement amount and direction of the horizontal and vertical components of the subject image from the image information on the memory are provided.
プリング範囲の移動量の設定には、複数個の前記被写体
像移動検出手段の出力値より計算処理した値を用いる自
動合焦装置。5. The automatic focusing apparatus according to claim 4, wherein a value calculated from output values of a plurality of subject image movement detecting means is used for setting the moving amount of the sampling means of the gate means.
前記ゲート手段を制御すべき情報を検出したフィールド
の次のフィールドで、前記ゲート手段を制御する自動合
焦装置。6. The method according to claim 1, 2, 3, 4 or 5.
An automatic focusing device for controlling the gate means in a field next to a field in which information for controlling the gate means is detected.
て、前記被写体像を、画面より消失または、映像信号が
激しく変化した場合は、映像信号のサンプリング範囲を
所定の位置に設定する自動合焦装置。7. The sampling range of a video signal according to claim 1, 2, 3, 4, 5 or 6, when the subject image disappears from the screen or the video signal changes drastically, the sampling range of the video signal is set to a predetermined position. Automatic focusing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273743A JPH05115029A (en) | 1991-10-22 | 1991-10-22 | Automatic focusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273743A JPH05115029A (en) | 1991-10-22 | 1991-10-22 | Automatic focusing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05115029A true JPH05115029A (en) | 1993-05-07 |
Family
ID=17531957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3273743A Pending JPH05115029A (en) | 1991-10-22 | 1991-10-22 | Automatic focusing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05115029A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100468871B1 (en) * | 2002-10-09 | 2005-01-29 | 삼성테크윈 주식회사 | Method for automatic focusing within camera wherein second-order function is utilized |
-
1991
- 1991-10-22 JP JP3273743A patent/JPH05115029A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100468871B1 (en) * | 2002-10-09 | 2005-01-29 | 삼성테크윈 주식회사 | Method for automatic focusing within camera wherein second-order function is utilized |
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