JPS5858505A - Auto-focus device for video camera - Google Patents
Auto-focus device for video cameraInfo
- Publication number
- JPS5858505A JPS5858505A JP56157493A JP15749381A JPS5858505A JP S5858505 A JPS5858505 A JP S5858505A JP 56157493 A JP56157493 A JP 56157493A JP 15749381 A JP15749381 A JP 15749381A JP S5858505 A JPS5858505 A JP S5858505A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- helicoid
- voltage
- focus
- value
- 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.)
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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
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- 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】
本発明は、ビデオカメラの自動焦点合わせ装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic focusing device for a video camera.
ビデオカメラの特徴を生かした自動焦点合わせ装置とし
て撮影中の映像信号の高域成分を用いて画面の精ｍ度を
検出し、精細度が最大となるようにレンズの距離環（以
下へリコイドと言う）を回転制御するいわゆる山登多制
御が知られ、ている。この方式はＮＨＫ技術報告、昭和
４０年第１７巻、第１号１通巻第８６号２１ページに石
田他着「山登シサーボ方式によるテレビカメラの自動一
点調整」として詳細に述べられているが、以下この方式
ｔ−第１図、第２図を用−て簡単に説明する。As an automatic focusing device that takes advantage of the characteristics of a video camera, it detects the precision of the screen using the high-frequency components of the video signal being shot, and adjusts the distance ring (hereinafter referred to as a helicoid) of the lens to maximize the precision. So-called mountain climbing control is known and is used to control the rotation of This method is described in detail in NHK Technical Report, 1965, Vol. 17, No. 1, Volume 1, No. 86, Page 21, by Ishida et al., ``Automatic single-point adjustment of television cameras using the Yamato Shiservo method.'' This method will be briefly explained below using FIGS. 1 and 2.
第１図は山登シ方式による自動焦点合わせ装置の構成ブ
ロック図である。１はレンズ、２はカメラ回路、５は映
像信号の出力端子、４はバイパスフィルタ、５は検波器
、６は差分ホールド回路、７はモータ駆動回路、８はレ
ンズ１のへリコイドを回転するためのモータである。FIG. 1 is a block diagram of the configuration of an automatic focusing device based on the Yamatoshi method. 1 is a lens, 2 is a camera circuit, 5 is a video signal output terminal, 4 is a bypass filter, 5 is a detector, 6 is a differential hold circuit, 7 is a motor drive circuit, 8 is for rotating the helicoid of lens 1 motor.
以下、第２図の特性図を用いて第１図の構成の動作を説
明する。The operation of the configuration shown in FIG. 1 will be explained below using the characteristic diagram shown in FIG.
レンズ１よシ入射される被写体からの元は結像し、カメ
ラ回路２によυ電気信号となシ、端子３に映像信号とし
て出力される。この映像信号の高域成分゛だけか、バイ
パスフィルタ４で抽出され、検波器５で検波された後、
端子５１にあられれる。端子５１にあられれる映像信号
の高域成分に対応する電圧（以後、焦点電圧と言う）第
２図の曲線イで表わすような電圧となる。この焦点電圧
は撮映像の精細度に対応しているので、レンズ１のへリ
コイドの位置（Ａとする］が、レンズ１と被写体間の距
離に合致していれば最大となｐｌこれからずれるに従い
低下する。The image of the object incident through the lens 1 is formed into an image, which is converted into an electrical signal by the camera circuit 2 and outputted to the terminal 3 as a video signal. Only the high-frequency components of this video signal are extracted by the bypass filter 4, and after being detected by the detector 5,
It appears on the terminal 51. The voltage corresponding to the high frequency component of the video signal applied to the terminal 51 (hereinafter referred to as focal voltage) is a voltage as shown by curve A in FIG. This focal voltage corresponds to the definition of the captured image, so if the position of the helicoid of lens 1 (denoted as A) matches the distance between lens 1 and the subject, it will be maximum. descend.
第２．図から判断される事は何らかの手段によりヘリコ
イドの位置を焦点電圧の山を登るように制御し、焦点電
圧が最大となる山の頂上にヘリコイドが導ければ自動焦
点合わせ装置が形成しうる。Second. What can be determined from the figure is that if the position of the helicoid is controlled by some means so that it climbs the peak of the focal voltage, and the helicoid is guided to the top of the mountain where the focal voltage is maximum, an automatic focusing device can be formed.
この手Ｒは、第１図の差分ホールド回路６からモータＢ
に至る構成により達せられる。即ち。This hand R is connected to the motor B from the differential hold circuit 6 in FIG.
This can be achieved through a configuration that leads to. That is.
モータ８によシヘリコイド位置を動かしながら、差分ホ
ールド回路６は端子５１に表われる焦点電圧？一定時間
毎にサンプルホールドし、焦点電圧が時間経過に対し増
加方向であれば正の電圧、減少方向であれば負の電圧を
出力する。モータ駆動回路７は、＠２図の曲線口に示す
ような端子６１に表われる差分ホールド回路６の電圧が
正の時はモータ８の回転方向をそのままに保ち、山登夛
をつづけ、負の時は回転方向を逆転させ山を登る方向へ
と戻す。このようにすれば＃１１図の構成のへリコイド
位置制御閉ループは焦点電圧によ）作られる山を差分ホ
ールド＠路６の出力電圧を参照して登ってゆき、ついに
はこの山の頂上で小きざみに振動しながら定常状１１に
達する事によシ、自動的に焦点合わせができる口取上が
山登シ万式によるビデオカメラの自動焦点合わせ装置で
おる。While moving the helicoid position by the motor 8, the differential hold circuit 6 collects the focal voltage appearing at the terminal 51. Samples and holds are carried out at fixed time intervals, and if the focal voltage is increasing over time, a positive voltage is output, and if it is decreasing, a negative voltage is output. When the voltage of the differential hold circuit 6 appearing at the terminal 61 as shown at the curved line in Figure @2 is positive, the motor drive circuit 7 keeps the rotational direction of the motor 8 as it is, continues climbing the mountain, and maintains the negative voltage. Time reverses the direction of rotation and returns it to the direction of climbing the mountain. In this way, the helicoid position control closed loop with the configuration shown in Figure #11 will climb the mountain created by the focal voltage by referring to the output voltage of differential hold@route 6, and will eventually reach the top of this mountain. An automatic focusing device for a video camera developed by Yamato Shimanshiki is capable of automatically focusing by vibrating in increments and reaching a steady state 11.
この方式は、撮訣像そのものを用いて焦点合わせ動作を
行うため、独立の測距機構で測距した結果でヘリコイド
位置を開ループ制御するものと比べて、簡単な構造で初
期調整数も少なく、安細に正確な自動焦点合わせ装ａ１
を構成するが、以下に述べる改良すべき点を鳴する。Since this method performs focusing using the captured image itself, it has a simpler structure and requires fewer initial adjustments than a method that uses open-loop control of the helicoid position based on the distance measurement results from an independent distance measurement mechanism. , cheap and accurate automatic focusing device A1
However, the points that should be improved are listed below.
この改良すべき点は、１つは山の頂上付近で小きざみに
振動しつつ定常状態に達するという点でＴｏｌ＞、もう
１つはレンズ１の紋り＠Ｆ、焦点距離ｆに対応する被写
界深度の違いによシ、同じへリコイドの位置に対して、
ボケの程度が異なる事に起因する。被写界深度が変わる
と。The points to be improved are: one is that it vibrates in small increments near the top of the mountain and reaches a steady state, and the other is that the lens 1 has a ripple @F, and the object corresponding to the focal length f. Due to the difference in depth of field, for the same helicoid position,
This is due to the different degrees of blur. When the depth of field changes.
ａｉｉｉ面上で同一物を撮像しても、レンズの＜）出し
量に対するボケの量が変化するため、焦点電圧の山の形
、高さは影響を受ける。この代表的なｓｔｔｇｓ図に示
す。同図にお＾て、（ｔｌ １４ 適正な場合、（２）
は被写界深度が浅Ａ場合、（３）は被写界深度が深い場
合である。第５図から明らかなように、偉）の例では合
焦点付近では充分な電圧が得られて論るが、合焦点から
離れたところではまったく焦点電圧が生じて＾ない、そ
のなめこの領域で社、ヘリコイド位置を動かしても１、
差分電圧が生じない九め、その位ｌｉｔを頂上と判断し
、山登シ動作全終了する事によシ、撮映画倫はボケる。Even if the same object is imaged on the aiii plane, the amount of blur changes with respect to the amount of lens protrusion (<), so the shape and height of the peak of the focal voltage are affected. This is shown in a representative sttgs diagram. In the same figure, (tl 14 If appropriate, (2)
(3) is a case where the depth of field is shallow A, and (3) is a case where the depth of field is deep. As is clear from Figure 5, in the case of example 1), a sufficient voltage is obtained near the focal point, but no focal voltage is generated at all away from the focal point, and in this region Even if you move the helicoid position,
At the ninth point, when no differential voltage is generated, the mountain is judged to be at the top, and the mountain climbing operation is completely completed, so that the film quality is blurred.
また（３）の場合はへリコイドがどの位置においても山
の形が平坦すぎる几め、ヘリコイド位置を変化させても
、焦点電圧の変化分である差分゛電圧を検出できず、そ
の位置を頂上と判断し、山登シ動作を終了する。このよ
うにレンズの状態によりては、山登シ動作に誤動作を生
じる場合がある。In the case of (3), the shape of the mountain is too flat at any position of the helicoid, and even if the helicoid position is changed, the differential voltage, which is the change in focal voltage, cannot be detected, and the position is set at the top. It is determined that the mountain climbing operation is completed. As described above, depending on the condition of the lens, malfunctions may occur during the mountain climbing operation.
本発明の目的は上記した問題点を解決し、合焦点付近で
のへリーイド位置の振動をなくし、レンズの紋ｐ値、焦
点距離によって被写界深度が変化しても、正しく合焦動
作を行う事のできる自動合焦装置を提供する事にある。The purpose of the present invention is to solve the above-mentioned problems, eliminate the vibration of the helioid position near the in-focus point, and ensure correct focusing even if the depth of field changes depending on the lens pattern p value and focal length. The objective is to provide an automatic focusing device that can perform the following tasks.
上記の目的を達成するために本発明では焦点電圧そのも
のを検出し、現在の値と、前の値との変化分だけを検出
するのでなく、現在の値と前に検出した値のうち最大の
ものとの変化分を計算する事によ３７ＷＡ動作のない合
焦動作を行うものである。In order to achieve the above object, the present invention detects the focal voltage itself, and not only detects the change between the current value and the previous value, but also detects the maximum change between the current value and the previously detected value. By calculating the amount of change from the object, focusing operation without 37WA operation is performed.
第４図に本発明による自動合焦装置の一実施例のブロッ
ク図を示す。第４図中１〜８は１１ｇ１図中に示した同
一番号をもつブロックと同−機能含有するブロックであ
る。１０はノ１イノ（スフイルタ、１１はリセット信号
を発生する積分リセット回路である。１２は積分回路で
あシ、積分リセット回路１１よルの信号が入力するまで
の一定期間、入力信号を積分する。以後は、この積分回
路１２の積分出力電圧を焦点電圧と呼ぶ。１３は積分回
路１２によシ得られた焦点電圧を本発明の山登シ下シ判
定回路１５へ導く友めのＡ／Ｄ変換器である。１４はレ
ンズのへリコイド位置金山登シ下シ判定回路１５へ情報
として入力するためのんΦ変換器である。FIG. 4 shows a block diagram of an embodiment of an automatic focusing device according to the present invention. 1 to 8 in FIG. 4 are blocks having the same functions as the blocks having the same numbers shown in FIG. 11g1. 10 is a filter; 11 is an integral reset circuit that generates a reset signal; 12 is an integral circuit that integrates the input signal for a certain period of time until the signal from the integral reset circuit 11 is input. .Hereinafter, the integrated output voltage of the integrating circuit 12 will be referred to as the focal voltage. 13 is a friend A/13 that guides the focal voltage obtained by the integrating circuit 12 to the mountain climbing lower seat determination circuit 15 of the present invention. A D converter 14 is a non-Φ converter for inputting information to a lens helicoid position determination circuit 15.
レンズの紋υ値、焦点距離によって被写界深度が変化し
た時の動作にり＾て第５図を使い説明する。The operation when the depth of field changes depending on the lens pattern υ value and focal length will be explained using Fig. 5.
第５図（１）は深度が適正な場合、＠）は深度が浅い場
合、伸）は深度が深い場合のへリコイド位置に対する焦
点電圧の分布を示している。FIG. 5(1) shows the distribution of the focal voltage with respect to the helicoid position when the depth is appropriate, @) when the depth is shallow, and ex) when the depth is deep.
積分回路１２から出力される焦点電圧はルΦ変換器１３
によシデジタル量に変換され、山登シ下〕判定回路１５
へ入力される。また同時にその時点でのへリコイド位置
も爲Φ変換器１４を通して山登シ下シ判定回路１５へ入
力される。山登り下シ判定回路１５では、ヘリコイド位
置に対する焦点電圧のＡ／Ｄ ＠の変化を常時記憶し１
次の状態にある時山登シから白下シヘ転じ九と判定する
（！） 現時点の焦点電圧のルの値が直前の焦点電圧
のＡ／Ｄ ＠よシ２以上小さくなった時。これは、ルΦ
変換器１５へ入力される焦点電圧のうち最大のものに対
して２／１２７、即ち約１６％ （本実施例では６５ｒ
Ｉｆ）にあたる。The focal voltage output from the integrating circuit 12 is converted to a Φ converter 13.
It is then converted into a digital quantity and used for mountain climbing] Judgment circuit 15
is input to. At the same time, the helicoid position at that time is also input to the mountain climbing/lowering determination circuit 15 through the Φ converter 14. The hill-climbing downhill determination circuit 15 constantly stores changes in the focal voltage A/D with respect to the helicoid position.
When in the following state, it is determined that the change from mountain climbing to white down is 9 (!) When the value of the current focal voltage becomes smaller than A/D of the previous focal voltage by 2 or more. This is leΦ
2/127, or approximately 16%, of the maximum focal voltage input to the converter 15 (in this example, 65r
If).
（２） 現時点の焦点電圧のＡ／Ｄ ＠がそれ以前に
入力された焦点電圧の最大値に対して３以上小さくなっ
た時
従って直前の値と尋しいか１小さい時は、増加方向と判
定され、ヘリコイドの移動方向は変らない、ここで直前
の値よシ１小さい時に増加方向と判定する理由は、若干
の維音成分あるいはＡ／Ｄ変換器１４の量子化誤差など
によシ増減判断ｔ−誤まらぬための配慮である。(2) When the A/D @ of the current focal voltage is 3 or more smaller than the maximum value of the focal voltage input before then, if it is 1 or more smaller than the previous value, it is determined that the direction is increasing. The moving direction of the helicoid does not change, and the reason why it is determined that the direction is increasing when it is 1 smaller than the previous value is because there are some fiber components or quantization errors of the A/D converter 14. T-This is a precaution to avoid mistakes.
ヘリコイドは至近から■方向へ移動して込るとし、今Ｅ
ｌ／ＣＴｏるとする。第５図（１）セは山登υ下り判定
回路１５によシＥからＡは焦点電圧の変化は増加方向と
判定される。そしてＡからＢヘヘリコイド位置が移ると
１判定条件（１）により山王りに転じたと判定され、山
登Ｖ１判定回路１５によシモータが逆転し、増加から減
少へ転じた点Ａでモータが停止する。前述のように焦点
電圧に対応するヘリコイド位置の情報も山登）下シ回路
１５に入力されるため、Ａ点の位置は山登シ下シ回路１
５に記憶されている。そのためＡ点を行き過ぎる事はな
い。第５図（８）の場合は、ＥからＣでは、焦点電圧の
変化はないが、判定条件（１１，（！ｌを満足しないた
め、増加方向と判定されＡまでヘリコイドを移動させる
。そしてＡからＢヘヘリコイド位置が移ると、判定条件
（１）によシ山王９に転じ九と判定され、山登Ｄ”ＦＤ
判定回路１５によシ（１）の場合と同様にしてヘリコイ
ド位置はＡに移シ停止する。第５図（３１は被写界深度
が深いため、山の形が平坦となる場合で−Ｔｏシ、（１
１、１１１）と同様にしてＥから４は増加方向と判定さ
れる。山の形が平坦なためＡからＢへ移っても焦点電圧
の変化は＃１とんどないと見なされ、モータの回転方向
は逆転しない。Assume that the helicoid is moving in the ■ direction from a close distance, and now E
Suppose that l/CTo. In FIG. 5(1), the mountain climbing/downhill determination circuit 15 determines that the change in focal voltage from E to A is in the increasing direction. Then, when the helicoid position moves from A to B, it is determined that the helicoid has turned to mountain climbing according to the first determination condition (1), and the shimotor is reversed by the mountain climbing V1 determination circuit 15, and the motor stops at point A, where the increase changes from increase to decrease. . As mentioned above, since the information on the helicoid position corresponding to the focal voltage is also input to the lower circuit 15, the position of point A is determined by the lower circuit 1.
It is stored in 5. Therefore, you will not go too far past point A. In the case of Fig. 5 (8), there is no change in the focal voltage from E to C, but since the judgment conditions (11, (!l) are not satisfied, it is judged that the direction is increasing, and the helicoid is moved to A. When the helicoid position moves from B to B, it changes to Sanno 9 according to judgment condition (1) and is determined to be 9, making Sanno D”FD
The determination circuit 15 moves the helicoid position to A and stops in the same manner as in case (1). Figure 5 (31 is a case where the mountain shape is flat because the depth of field is deep, -Toshi, (1
1, 111), E to 4 are determined to be in the increasing direction. Since the shape of the mountain is flat, even when moving from A to B, the change in the focal voltage is considered to be negligible, and the rotation direction of the motor does not reverse.
ヘリコイドがＤへ移ると、Ｂ点とＤ点における４４）＠
の変化量は判定条件（１）を満足しないが、セれまでの
焦点電圧の最大値を示す点Ａに対しては条件伐）を満た
すため、Ｄ点で山登夛下シ判定回路１５は川下シに転じ
たと判定し、（凰）、（２）と同様にしてヘリコイド位
置ｋＡＫ移し停止する。When the helicoid moves to D, 44) @ at point B and point D
Although the change amount does not satisfy the judgment condition (1), it satisfies the condition for point A, which indicates the maximum value of the focal voltage up to the point of separation, so at point D, the mountain climbing judgment circuit 15 It is determined that the helicoid has shifted to the downstream direction, and the helicoid moves to the helicoid position kAK and stops in the same manner as in (凰) and (2).
以上によ〕合焦動作が行なわれる。As described above, a focusing operation is performed.
以上述べたように、本発明により被写界深度の浅い場合
でも、深い場合でも焦点電圧の山の形にかかわらず、正
しい山登多動作を行う事ができる。As described above, according to the present invention, correct mountain-climbing operation can be performed regardless of the shape of the peak of the focal voltage, whether the depth of field is shallow or deep.
なお、上述の説明では焦点電圧の山の傾きがレンズの被
写界探度に対応して変化するとしたが、山の傾きは撮像
画・面の絵柄、すなわち撮像ビデオ信号の周波数スペク
トルによっても変化するが、山の傾きそのものの変化に
よらず正しく山頂を求める手段に本−発明の意図がある
ことを考えれば１本発明は撮像ｌｉｉ面の絵柄による山
の傾きの変化にも影響を受けずに正確に判定できる効果
があることは明白である。In the above explanation, it is assumed that the slope of the peak of the focal voltage changes depending on the field of view of the lens, but the slope of the peak also changes depending on the pattern of the captured image/surface, that is, the frequency spectrum of the captured video signal. However, considering that the intention of the present invention is to provide a means for correctly determining the mountaintop regardless of changes in the slope of the mountain itself, the present invention is not affected by changes in the slope of the mountain due to the pattern on the imaging surface. It is clear that there is an effect that can be accurately determined.
また、第４図を用いた説明の文中で白下シの判断として
隣接したＡＤＤ値では２以上、最大銀に対しては３以上
という数字を用いたが、これらの数字が他の麹となって
も良いのは言うまでもない。In addition, in the explanation using Figure 4, we used numbers 2 or more for adjacent ADD values and 3 or more for the maximum silver as a judgment of Shiroshita, but these numbers are used for other koji. Needless to say, it's fine.
第１図は従来の山登９方式ビデオカメラのブロック構成
図、第２図及び第６図はへリコイド位置に対する焦点電
圧の変化を示す特性図、第４図は本発明の一実施例の構
成を示すブロック図、第５図はへリコイド位置に対する
焦点電圧の変化を示す特性図である。
１・・・レンズ ２・・・カメラ回路４・・
・高域フィルタ ５・・・検波器６・・・差分ホー
ルド回路 ７・・・モータ駆動回路８・・・モータ
１０・・・１次バイパスフィルタ１２・・・
積分回路 １４１４・・・Ａ７′Ｄ変換器 −
１５・・・山登り下９判定回路
二 へ？ノコイド＆置FIG. 1 is a block configuration diagram of a conventional mountain climbing 9 type video camera, FIGS. 2 and 6 are characteristic diagrams showing changes in focal voltage with respect to helicoid position, and FIG. 4 is a configuration of an embodiment of the present invention. FIG. 5 is a characteristic diagram showing changes in focal voltage with respect to helicoid position. 1...Lens 2...Camera circuit 4...
・High-pass filter 5...Detector 6...Differential hold circuit 7...Motor drive circuit 8...Motor
10...1st order bypass filter 12...
Integrating circuit 1414...A7'D converter -
15...To mountain climbing lower 9 judgment circuit 2? Nocoid & Place
Claims (1)
抽出する手段と、抽出された該信号量の増減を検出する
ことによシ抽出された該信号蓋が最大となるように撮像
レンズ管制御する制御手段とを有して成るビデオカメラ
のオートフォーカス装置にお−て％隣接して得られる該
信号蓋間の差があらかじめ定めたｆｌｌＡｔ−下まわる
か、あるいは最近に得られた該信号量がそれまでに得ら
れている該信号量の最大値よりあらかじめ定めた値Ｂｔ
−下まわる場合に該信号量が減じ友と判断する手段を具
備することを特徴とするビデオカメラのオートフォーカ
ス装置。A means for extracting a signal amount corresponding to focus correctness from a captured video signal, and an imaging lens tube configured to maximize the extracted signal amount by detecting an increase or decrease in the extracted signal amount. In an autofocus device of a video camera comprising a control means for controlling, the difference between the signals obtained adjacently is less than a predetermined value fllAt-, or the signal obtained recently. The amount is a predetermined value Bt from the maximum value of the signal amount obtained so far.
- An autofocus device for a video camera, comprising means for determining that the signal amount decreases when the signal amount decreases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56157493A JPS5858505A (en) | 1981-10-05 | 1981-10-05 | Auto-focus device for video camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56157493A JPS5858505A (en) | 1981-10-05 | 1981-10-05 | Auto-focus device for video camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5858505A true JPS5858505A (en) | 1983-04-07 |
| JPH0115188B2 JPH0115188B2 (en) | 1989-03-16 |
Family
ID=15650887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56157493A Granted JPS5858505A (en) | 1981-10-05 | 1981-10-05 | Auto-focus device for video camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5858505A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0249817A2 (en) * | 1986-06-13 | 1987-12-23 | Sanyo Electric Co., Ltd. | Automatic focusing circuit |
| US4841370A (en) * | 1986-11-17 | 1989-06-20 | Sanyo Electric Co., Ltd. | Automatic focusing circuit for automatically matching focus in response to video signal |
| US4853789A (en) * | 1987-02-18 | 1989-08-01 | Sanyo Electric Co., Ltd. | Automatic focusing circuit using a two period detection interval to compensate for motion occurring within a field of view |
| US5055933A (en) * | 1989-11-22 | 1991-10-08 | Sanyo Electric Co., Ltd. | Automatic focusing apparatus and automatic focusing method for automatically matching focus in response to video signal |
| US5319462A (en) * | 1990-02-28 | 1994-06-07 | Sanyo Electric Co., Ltd. | Automatic focusing apparatus for automatically adjusting focus in response to video signal by fuzzy inference |
| US5404013A (en) * | 1993-02-25 | 1995-04-04 | Fujitsu Limited | Infrared imaging system having an automatic focusing control |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007310004A (en) | 2006-05-16 | 2007-11-29 | Citizen Holdings Co Ltd | Automatic focusing apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4852231A (en) * | 1971-11-01 | 1973-07-23 | ||
| JPS52137330A (en) * | 1976-05-13 | 1977-11-16 | Olympus Optical Co Ltd | Device for holding peak value |
| JPS54161928A (en) * | 1978-06-12 | 1979-12-22 | Canon Inc | Focus detector |
| JPS55111929A (en) * | 1979-02-21 | 1980-08-29 | Ricoh Co Ltd | Automatic focusing device |
| JPS5651164A (en) * | 1979-10-03 | 1981-05-08 | Hitachi Ltd | Automatic focusing device |
-
1981
- 1981-10-05 JP JP56157493A patent/JPS5858505A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4852231A (en) * | 1971-11-01 | 1973-07-23 | ||
| JPS52137330A (en) * | 1976-05-13 | 1977-11-16 | Olympus Optical Co Ltd | Device for holding peak value |
| JPS54161928A (en) * | 1978-06-12 | 1979-12-22 | Canon Inc | Focus detector |
| JPS55111929A (en) * | 1979-02-21 | 1980-08-29 | Ricoh Co Ltd | Automatic focusing device |
| JPS5651164A (en) * | 1979-10-03 | 1981-05-08 | Hitachi Ltd | Automatic focusing device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0249817A2 (en) * | 1986-06-13 | 1987-12-23 | Sanyo Electric Co., Ltd. | Automatic focusing circuit |
| US4841370A (en) * | 1986-11-17 | 1989-06-20 | Sanyo Electric Co., Ltd. | Automatic focusing circuit for automatically matching focus in response to video signal |
| US4853789A (en) * | 1987-02-18 | 1989-08-01 | Sanyo Electric Co., Ltd. | Automatic focusing circuit using a two period detection interval to compensate for motion occurring within a field of view |
| US5055933A (en) * | 1989-11-22 | 1991-10-08 | Sanyo Electric Co., Ltd. | Automatic focusing apparatus and automatic focusing method for automatically matching focus in response to video signal |
| US5319462A (en) * | 1990-02-28 | 1994-06-07 | Sanyo Electric Co., Ltd. | Automatic focusing apparatus for automatically adjusting focus in response to video signal by fuzzy inference |
| US5404013A (en) * | 1993-02-25 | 1995-04-04 | Fujitsu Limited | Infrared imaging system having an automatic focusing control |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0115188B2 (en) | 1989-03-16 |
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