JP2002014278A - Af system - Google Patents
Af systemInfo
- Publication number
- JP2002014278A JP2002014278A JP2000197519A JP2000197519A JP2002014278A JP 2002014278 A JP2002014278 A JP 2002014278A JP 2000197519 A JP2000197519 A JP 2000197519A JP 2000197519 A JP2000197519 A JP 2000197519A JP 2002014278 A JP2002014278 A JP 2002014278A
- Authority
- JP
- Japan
- Prior art keywords
- change
- data
- difference
- focus position
- determination level
- 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.)
- Granted
Links
Landscapes
- Measurement Of Optical Distance (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、山登り方式により
合焦動作を行い、ピント位置を検出した後も継続的に合
焦動作を行うＡＦシステムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AF system which performs a focusing operation by a hill-climbing method and continuously performs a focusing operation after detecting a focus position.
【０００２】[0002]
【従来の技術】継続的にＡＦを行うシステムにおいて、
山登り方式でピントを検出した後、被写体に変化が生じ
るまでレンズを止めておき、変化が生じたときにスキャ
ンを行なう処理が一般的である。2. Description of the Related Art In a system for continuously performing AF,
Generally, after detecting the focus by the hill-climbing method, the lens is stopped until a change occurs in the subject, and a scan is performed when the change occurs.
【０００３】[0003]
【発明が解決しようとする課題】上記スキャン処理にお
いて、得られるレベル変化の中にノイズ，フリッカー，
手ブレ等による成分が含まれているため、被写***置の
変化の有無の判定ではそれらと区別するのは困難であ
る。また、システムは被写体の移動とシーンチェンジ等
の区別がつけられない。そのため被写体が僅かに移動し
たにもかかわらず、シーンチェンジとして不要な距離範
囲までスキャンする場合がある。継続的にＡＦを追うシ
ステムにおいては、被写***置が変わった場合、速やか
にしかも確実にそのピント位置に達することが要請され
る。In the above-described scan processing, noise, flicker,
Since components due to camera shake and the like are included, it is difficult to distinguish them from the change in the determination of the presence or absence of a change in the position of the subject. In addition, the system cannot distinguish between movement of a subject and scene change. Therefore, even if the subject has moved slightly, scanning may be performed to an unnecessary distance range as a scene change. In a system that continuously pursues AF, when the position of a subject changes, it is required to quickly and surely reach the focus position.
【０００４】本発明は上記要請に応えるもので、ピント
位置を検出した後、被写体の変化に対応して再度ピント
位置検出処理を行うか否かの的確な判断をし、ピント位
置検出処理を実行すると判断した場合、最適なスキャン
処理を行って効率の良い合焦動作を行うことができるＡ
Ｆシステムを提供することにある。The present invention responds to the above-mentioned demands. After detecting a focus position, an accurate determination is made as to whether or not to perform focus position detection processing again in response to a change in a subject, and the focus position detection processing is executed. If it is determined that the focusing operation is performed, an optimal scanning process can be performed and an efficient focusing operation can be performed.
F system.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
に本発明によるＡＦシステムは、山登り方式により合焦
動作を行い、ピント位置を検出した後も継続的にピント
を追うＡＦシステムにおいて、合焦後、合焦位置近傍の
データの時間的平均値を取り、その合焦位置近傍の平均
値とその合焦位置近傍のデータ最大値の差分量が第１の
変化判定レベルより小さい場合には変化無しと判断し、
前記差分量が第１の変化判定レベルより大きく第２の変
化判定レベルより小さい場合には変化量が小と判断し、
前記差分量が第２の変化判定レベルより大きいと判断し
た場合には変化量が大きいと判断し、前記変化量が大き
い場合には広い範囲を間引いた荒いスキャンを行い、前
記変化量が小さい場合には狭い範囲を細かくスキャンす
るように構成されている。前記変化判定レベルは、δ×
ｋ倍で規定し、前記δは被写体のコントラスト，明るさ
によって変化するように構成できる。 但し ｋ：倍率 δ：単位レベルIn order to achieve the above object, an AF system according to the present invention performs an in-focus operation by a hill-climbing method and continuously focuses after detecting a focus position. After focusing, the temporal average value of the data near the in-focus position is taken. If the difference between the average value in the vicinity of the in-focus position and the maximum data value in the vicinity of the in-focus position is smaller than the first change determination level, Judge that there is no change,
When the difference amount is larger than the first change determination level and smaller than the second change determination level, it is determined that the change amount is small,
When it is determined that the difference amount is larger than the second change determination level, it is determined that the change amount is large. When the change amount is large, a rough scan is performed by thinning out a wide range, and when the change amount is small. Is configured to finely scan a narrow range. The change determination level is δ ×
It is defined by k times, and the δ can be configured to change depending on the contrast and brightness of the subject. Where k: magnification δ: unit level
【０００６】[0006]
【発明の実施の形態】以下、図面を参照して本発明をさ
らに詳しく説明する。図１は、本発明によるＡＦシステ
ムの回路の実施の形態を示すブロック図である。被写体
光３は、ズームレンズ１およびフォーカスレンズ２を通
ってＣＣＤ４に入射する。ＣＣＤ４が出力した映像信号
は、カメラプロセス回路５で処理され、輝度信号および
色信号が生成される。図１にはＡＦ制御に必要な輝度信
号のみが示されている。輝度信号は、ＡＦウインドウ回
路６に入力され、ＡＦ制御に必要なエリアの輝度信号の
みが抽出される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a circuit of an AF system according to the present invention. The subject light 3 enters the CCD 4 through the zoom lens 1 and the focus lens 2. The video signal output from the CCD 4 is processed by the camera process circuit 5 to generate a luminance signal and a color signal. FIG. 1 shows only luminance signals necessary for AF control. The luminance signal is input to the AF window circuit 6, and only a luminance signal of an area necessary for AF control is extracted.
【０００７】この後、ＡＦ制御に必要な信号帯域のみを
パスさせるバンドパスフィルタ（ＢＰＦ）７に入力され
る。バンドパスフィルタ７を出力した輝度信号は、絶対
値回路８，積分器９を介してＣＰＵ１０に入力される。
積分器９は、１フィールド分の輝度信号を積分した後、
ＣＰＵ１０から送られる積分クリア信号ＣＲによって積
分データをクリアする。ＣＰＵ１０は、入力される垂直
同期信号（ＶＤ），水平同期信号（ＨＤ）から１フィー
ルドの開始を判断し、１フィールドの開始時に積分器９
に対し積分クリア信号ＣＲを送り、１フィールドの終了
時にＣＰＵ１０に積分データＦＤを取り込む。ＣＰＵ１
０はこの動作の繰り返しによって焦点電圧を得ることが
できる。ＣＰＵ１０は、焦点電圧に基づきレンズドライ
バ１１を駆動制御する。After that, the signal is input to a band-pass filter (BPF) 7 for passing only a signal band necessary for AF control. The luminance signal output from the bandpass filter 7 is input to the CPU 10 via the absolute value circuit 8 and the integrator 9.
The integrator 9 integrates the luminance signal for one field,
The integration data is cleared by the integration clear signal CR sent from the CPU 10. The CPU 10 determines the start of one field from the input vertical synchronizing signal (VD) and horizontal synchronizing signal (HD).
, An integral clear signal CR is sent to the CPU 10 to take in the integral data FD at the end of one field. CPU1
For 0, a focus voltage can be obtained by repeating this operation. The CPU 10 controls the driving of the lens driver 11 based on the focal voltage.
【０００８】図２は、本発明によるＡＦシステムの合焦
動作を説明するためのフローチャートである。図示しな
い電源が投入され、ＣＰＵ１０がＡＦ処理を開始する
と、ＡＦスキャン処理がなされる（Ｓ２０１）。つぎに
変化判定レベルを設定する（Ｓ２０２）。そしてＡＦデ
ータを取込み平均化する（Ｓ２０３）。取り込んだ平均
化されたＡＦデータと変化レベルとを比較し、その差分
量が第１変化判定レベル（ｎ×δ），第２変化判定レベ
ル（ｍ×δ）に対し大きいか否かの判定を行う（Ｓ２０
４）。第１および第２変化判定レベルより大きい場合に
は粗い再スキャン設定を行う（Ｓ２０６）。第１変化判
定レベルより大きく第２変化判定レベルより小さい場合
には細かい再スキャン設定を行う（Ｓ２０５）。平均化
されたＡＦデータとその合焦位置近傍のデータ最大値の
差分量が第１の変化判定レベルより小さい場合には変化
無しと判断する。FIG. 2 is a flowchart for explaining the focusing operation of the AF system according to the present invention. When a power source (not shown) is turned on and the CPU 10 starts the AF process, an AF scan process is performed (S201). Next, a change determination level is set (S202). Then, the AF data is acquired and averaged (S203). The acquired averaged AF data is compared with the change level, and it is determined whether or not the difference is greater than the first change determination level (n × δ) and the second change determination level (m × δ). Perform (S20
4). If it is larger than the first and second change determination levels, coarse rescan setting is performed (S206). If it is larger than the first change determination level and smaller than the second change determination level, fine rescan setting is performed (S205). If the difference between the averaged AF data and the data maximum value near the in-focus position is smaller than the first change determination level, it is determined that there is no change.
【０００９】つぎに判定基準値（変化判定レベル）につ
いて説明する。山登り方式のピント検出を行う場合、図
３に示すように被写体が暗いより明るい場合、被写体の
コントラストは低いより高い場合の方がＡＦデータの変
化率は大きくなる。したがってピントの再検出を行うか
否かの判断に用いる閾値を固定値にしてしまうと、低コ
ントラストや暗い被写体で被写体に変化があるにもかか
わらずピントの再検出処理を行わなかったり、明るくコ
ントラストのある被写体で被写界深度内であるにもかか
わらず僅かの変化やノイズで必要のないピントの再検出
を行うことになる。被写体条件によるＡＦデータ変化率
の違いに影響をされないようにするため、実際にピント
検出を行った際のＡＦデータの変化を元につぎのような
判定基準値を設定している。Next, the judgment reference value (change judgment level) will be described. In the case of performing the hill-climbing focus detection, as shown in FIG. 3, when the subject is brighter than dark, and when the contrast of the subject is higher than when the contrast is lower, the change rate of the AF data is higher. Therefore, if the threshold value used to determine whether or not to perform focus re-detection is set to a fixed value, focus re-detection processing is not performed even if the subject is changed in a low-contrast or dark subject, or bright contrast is not obtained. Unnecessary focus is re-detected with a slight change or noise even though the subject has a depth of field even though it is within the depth of field. In order not to be affected by the difference in the AF data change rate due to the subject condition, the following determination reference value is set based on the change in the AF data when the focus is actually detected.
【００１０】・ピント再検出（再スキャン）用の変化判
定レベルの基準値設定 図４に示すようにスキャン結果のピークと両隣でＡＦデ
ータの差分を取り、大きい方をδとして以下のように変
化の有無、大きさの判定基準を設けている。δは、明る
さ，コントラストにより変化する。 ・変化量検出 ＡＦデータを周期的に取り込みながらノイズや手ぶれ等
の影響を極力排除するために複数個のデータの平均化
（時間的）を図っている。すなわち変化判断に用いるデ
ータは単独での使用を避け、時間経過にしたがったデー
タを複数個取り入れている。ＡＦデータは、例えば、３
０〜４０ｍｓｅｃ間隔でデータを取込み、４〜５個のデ
ータ毎に平均化される。変化量は取り込み平均データと
合焦位置近傍のデータ最大値の差をとっている。 変化量＝取り込み平均データ−ＤＭＡＸReference value setting of change determination level for focus re-detection (re-scan) As shown in FIG. 4, the difference between AF data and the AF data on both sides is taken, and the larger one is changed as δ as shown below. The presence / absence and size determination criteria are provided. δ changes depending on brightness and contrast. Change amount detection While fetching AF data periodically, averaging (temporal) of a plurality of data is performed in order to minimize the influence of noise, camera shake, and the like. That is, the data used for the change determination is not used alone, but a plurality of data over time are taken. The AF data is, for example, 3
Data is fetched at intervals of 0 to 40 msec and averaged for every 4 to 5 data. The amount of change is the difference between the captured average data and the data maximum value near the focus position. Amount of change = Average data taken-DMAX
【００１１】この変化量と変化判定基準値（第１および
第２の変化判定レベル）を元に再スキャン判定を行う。 ・再スキャン判定 小さいウィンドウのＡＦデータと、大きいウィンドウの
ＡＦデータの両方に対し変化判定を行い、その組み合わ
せで判定する。 （小さいウィンドウのＡＦデータの変化判定） 変化無し： ｜変化量｜≦ｎ×δ ・・・（１） 変化量小： ｎ×δ＜｜変化量｜≦ｍ×δ ・・・（２） 変化量大： ｍ×δ＜｜変化量｜ ・・・（３） （大きいウィンドウのＡＦデータの変化判定）大きいウ
ィンドウのＡＦデータの変化判定も同様に以下のように
判定を行う。 変化無し： ｜変化量｜≦ｎ×Δ ・・・（４） 変化量小： ｎ×Δ＜｜変化量｜≦ｍ×Δ ・・・（５） 変化量大： ｍ×Δ＜｜変化量｜ ・・・（６） なお、ｎ，ｍは、ｎ＜ｍの関係にある。A rescan determination is made based on the amount of change and a change determination reference value (first and second change determination levels). Re-scanning determination Change determination is performed for both the AF data of the small window and the AF data of the large window, and the determination is made by a combination thereof. (Judgment of change in AF data of small window) No change: | change amount | ≦ n × δ (1) Small change amount: n × δ <| change amount | ≦ m × δ (2) change Large amount: m × δ <| change amount | (3) (Judgment of change in AF data of large window) Change judgment of AF data of a large window is similarly determined as follows. No change: | Change amount | ≦ n × Δ (4) Small change amount: n × Δ <| Change amount | ≦ m × Δ (5) Large change amount: m × Δ <| Change amount | (6) Note that n and m have a relationship of n <m.
【００１２】上記判定結果を併せて表１に照らして処理
内容を決定する。The contents of the processing are determined by referring to Table 1 together with the above determination results.
【表１】 [Table 1]
【００１３】小さいウィンドウのＡＦデータによりδよ
り大きい変化が生じなければ再スキャンの必要性はない
（主要被写体に変化がないと判断する）。変化が生じた
場合、大きいウィンドウのＡＦデータの変化判定も併せ
選択を行う。スキャンを行う判定が示された場合は、そ
の条件にしたがった再スキャン処理を行う。If a change larger than δ does not occur due to the AF data of a small window, there is no need to rescan (it is determined that there is no change in the main subject). If a change has occurred, the change determination of the AF data of the large window is also selected. If a determination to perform scanning is indicated, rescan processing is performed according to the conditions.
【００１４】[0014]
【発明の効果】以上、説明したように本発明は、山登り
方式により合焦動作を行い、ピント位置を検出した後も
継続的にピントを追い、合焦した後、合焦位置近傍のデ
ータの時間的平均値を算出し、その合焦位置近傍の平均
値とその合焦位置近傍のデータ最大値の差分量が第１の
変化判定レベルより小さい場合には変化無しと判断し、
差分量が第１の変化判定レベルより大きく第２の変化判
定レベルより小さい場合には変化量が小と判断し、差分
量が第２の変化判定レベルより大きいと判断した場合に
は変化量が大きいと判断し、その結果、変化量が大きい
場合には広い範囲を間引いた荒いスキャンを行い、変化
量が小さい場合には狭い範囲を細かくスキャンするもの
である。したがって、継続的にピント位置を追うＡＦシ
ステムにおいて、効率の良い再スキャン処理を実現する
ことができるという効果がある。As described above, according to the present invention, the focusing operation is performed by the hill-climbing method, the focus is continuously pursued even after the focus position is detected, and after focusing, the data in the vicinity of the focus position is obtained. A temporal average value is calculated, and when the difference amount between the average value near the in-focus position and the data maximum value near the in-focus position is smaller than the first change determination level, it is determined that there is no change,
When the difference amount is larger than the first change determination level and smaller than the second change determination level, the change amount is determined to be small. When the difference amount is determined to be larger than the second change determination level, the change amount is determined. If it is determined that the amount of change is large, as a result, if the amount of change is large, a rough scan is performed by thinning out a wide range, and if the amount of change is small, a narrow range is finely scanned. Therefore, there is an effect that an efficient rescan process can be realized in an AF system that continuously tracks the focus position.
【図１】本発明によるＡＦシステムの回路の実施の形態
を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a circuit of an AF system according to the present invention.
【図２】本発明によるＡＦシステムの動作を説明するた
めのフローチャートである。FIG. 2 is a flowchart for explaining the operation of the AF system according to the present invention.
【図３】被写体条件によるＡＦデータ変化率の差を説明
するための概略図である。FIG. 3 is a schematic diagram for explaining a difference in AF data change rate depending on subject conditions.
【図４】ピント再検出用の変化判定基準値の設定を説明
するための図である。FIG. 4 is a diagram for explaining setting of a change determination reference value for focus re-detection;
１…ズームレンズ ２…フォーカスレンズ ３…被写体光 ４…ＣＣＤ ５…プロセス回路 ６…ＡＦウインドウ ７…ＢＰＦ ８…絶対値回路 ９…積分器 １０…ＣＰＵ １１，１２…レンズドライバ DESCRIPTION OF SYMBOLS 1 ... Zoom lens 2 ... Focus lens 3 ... Subject light 4 ... CCD 5 ... Process circuit 6 ... AF window 7 ... BPF 8 ... Absolute value circuit 9 ... Integrator 10 ... CPU 11,12 ... Lens driver
Claims (2)
ト位置を検出した後も継続的にピントを追うＡＦシステ
ムにおいて、 合焦後、合焦位置近傍のデータの時間的平均値を取り、 その合焦位置近傍の平均値とその合焦位置近傍のデータ
最大値の差分量が第１の変化判定レベルより小さい場合
には変化無しと判断し、 前記差分量が第１の変化判定レベルより大きく第２の変
化判定レベルより小さい場合には変化量が小と判断し、 前記差分量が第２の変化判定レベルより大きいと判断し
た場合には変化量が大きいと判断し、 前記変化量が大きい場合には広い範囲を間引いた荒いス
キャンを行い、 前記変化量が小さい場合には狭い範囲を細かくスキャン
することを特徴とするＡＦシステム。1. An AF system which performs a focusing operation by a hill-climbing method and continuously pursues focus even after detecting a focus position, obtains a temporal average value of data in the vicinity of the focus position after focusing, and If the difference between the average value near the focus position and the maximum data value near the focus position is smaller than the first change determination level, it is determined that there is no change, and the difference amount is larger than the first change determination level. When the difference is smaller than the second change determination level, the change is determined to be small. When the difference is larger than the second change determination level, the change is determined to be large. The change is large. An AF system comprising: performing a rough scan by thinning out a wide range in a case; and finely scanning a narrow range when the amount of change is small.
し、前記δは被写体のコントラスト，明るさによって変
化することを特徴とする請求項１記載のＡＦシステム。 但し ｋ：倍率 δ：単位判定レベル2. The AF system according to claim 1, wherein the change determination level is defined by δ × k, and the δ changes depending on the contrast and brightness of the subject. Where k: magnification δ: unit judgment level
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000197519A JP4576027B2 (en) | 2000-06-30 | 2000-06-30 | AF system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000197519A JP4576027B2 (en) | 2000-06-30 | 2000-06-30 | AF system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002014278A true JP2002014278A (en) | 2002-01-18 |
| JP4576027B2 JP4576027B2 (en) | 2010-11-04 |
Family
ID=18695841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000197519A Expired - Fee Related JP4576027B2 (en) | 2000-06-30 | 2000-06-30 | AF system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4576027B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004334072A (en) * | 2003-05-12 | 2004-11-25 | Fuji Photo Film Co Ltd | Imaging apparatus |
Citations (9)
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04354478A (en) * | 1991-05-31 | 1992-12-08 | Sanyo Electric Co Ltd | Automatic focus video camera |
| JPH05316401A (en) * | 1992-05-13 | 1993-11-26 | Kyocera Corp | Automatic focus detector |
| JPH07154669A (en) * | 1993-11-25 | 1995-06-16 | Canon Inc | Automatic focus adjustment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004334072A (en) * | 2003-05-12 | 2004-11-25 | Fuji Photo Film Co Ltd | Imaging apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4576027B2 (en) | 2010-11-04 |
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