JP2869086B2 - Imaging device - Google Patents

Imaging device


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JP2869086B2 JP14709189A JP14709189A JP2869086B2 JP 2869086 B2 JP2869086 B2 JP 2869086B2 JP 14709189 A JP14709189 A JP 14709189A JP 14709189 A JP14709189 A JP 14709189A JP 2869086 B2 JP2869086 B2 JP 2869086B2
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JPH0311884A (en )
徹 澁澤
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【発明の詳細な説明】 (イ) 産業上の利用分野 本発明は、ビューファインダ及びフォーカス制御手段を有するビデオカメラ等の撮像装置に関し、特に、被写体の合焦度をビューファインダ上に表示させる表示機構に関する。 DETAILED DESCRIPTION OF THE INVENTION (i) industrial FIELD The present invention relates to an image pickup apparatus such as a video camera having a viewfinder and focus control means, in particular, display for displaying the degree of focus of the subject on the viewfinder about the mechanism.

(ロ) 従来の技術 一般にビデオカメラには、手動によりフォーカスレンズを光軸方向に進退させてフォーカス制御を行うマニュアルフォーカス制御機構と、赤外線を用いた測距方式あるいは輝度信号の高域成分を用いたTTL方式によりAFセンサから得られるAF情報に基づいて自動的にフォーカスレンズを進退させるオートフォーカス制御機構がともに採用されている場合が多い。 (B) use in the prior art generally camcorder, a manual focus control mechanism performs focus control by forward and backward the focus lens in the optical axis direction by manually high-frequency components of the distance measuring system or the luminance signal using infrared rays If autofocus control mechanism for automatically advancing and retracting the focus lens based on the AF information obtained from the AF sensor by TTL scheme had is employed together in many cases.

ところで、前述のマニュアルフォーカス制御を実行する場合、視度の影響を受け、また広角時等の被写界深度の深い時には合焦点が見つけ難い。 Incidentally, when performing the above-described manual focus control, the influence of diopter, also the focal point hardly find when deeper depth of field of wide-angle or the like.

そこで、例えば特開昭62−84660号公報(HO4N5/232) Therefore, for example, JP 62-84660 discloses (HO4N5 / 232)
の如く、オートフォーカス制御時に必要となるAF情報に基づいて合焦状態か否かの判定を常時行い、合焦状態と判断された時に発光素子を点灯させて、マニュアルフォーカス制御時にも使用者に合焦点に達したことを報知する方法が提案されている。 Of As, it is determined whether the focused state on the basis of the AF information needed when autofocus control at all times, by lighting the light-emitting element when it is determined that the in-focus state, even user during manual focus control how to notify that has reached the focus has been proposed.

(ハ) 発明が解決しよとする課題 前記従来技術によると、発光素子による表示は、合焦点に達したか否かの判定結果を示すに過ぎず、非合焦状態であっても合焦点にかなり接近しているのか否かという合焦の度合、所謂合焦度については、使用者は全くわからない。 (C) When the invention is due to problems the prior art to be solved, the display by the light emitting element is merely indicate whether the determination result reached focus, focus point even out-of-focus state degree of focus that whether fairly or are you close to, for Tokoroigo degree, do not know the user at all.

(ニ) 課題を解決するための手段 本発明は、撮像映像信号の高域成分を抽出する第1フィルタ手段と、第1フィルタ手段よりも低いカットオフ周波数を有し且つ撮像映像信号の高域成分を抽出する第2フィルタ手段と、第1フィルタ手段の出力を所定期間積分し第1積分値を得る第1積分手段と、第2フィルタ手段の出力を所定期間積分し第2積分値を得る第2積分手段と、第1積分値と第2積分値の比を算出し被写体の合焦度を検出する検出手段とを備得え、合焦度をビューファインダに表示することを特徴とする。 Means the present invention for solving the (D) problem, high-frequency of the first filter means and, and imaging video signal has a low cut-off frequency than the first filter means for extracting a high frequency component of the video image signal obtaining a second filter means for extracting a component, a first integrating means for obtaining a predetermined period integrating first integration value output of the first filter means, the predetermined time period by integrating the second integral value output of the second filter means a second integrating means, 備得 give a detection means for calculating a ratio of the first integral value and the second integral value to detect the degree of focus of an object, and displaying the degree of focus on the viewfinder .

(ホ) 作用 本発明は上述の如く構成したので、マニュアルフォーカス制御時にも正確なピント合わせが迅速に行なえる。 (E) effect the invention so constructed as described above, accurate focusing is quickly performed even during manual focus control.

(ヘ) 実施例 以下、図面に従い本発明の実施例について説明する。 (F) Example Hereinafter, examples of the present invention will be described in accordance with accompanying drawings.

第1図は本発明の実施例の回路ブロック図である。 FIG. 1 is a circuit block diagram of an embodiment of the present invention. 図中、(1)はフォーカスレンズ、(2)は撮像素子を有する撮像回路、(3)はフォーカスエリア設定用のゲート回路、(4)は同期分離回路、(5)はタイミング発生回路、(12a)(12b)はバンドパスフィルタ(BP In the figure, (1) the focus lens (2) imaging circuit having an imaging device, (3) a gate circuit for setting the focus area, (4) the synchronization separation circuit, (5) a timing generating circuit, ( 12a) (12b) is a band-pass filter (BP
F)、(13a)(13b)は検波回路、(14a)(14b)はデジタル積分回路、(10)は電子式ビューファインダ、 F), (13a) (13b) is a detection circuit, (14a) (14b) is a digital integrating circuit, (10) is an electronic view finder,
(11)はフォーカス情報表示回路、(21)はフォーカスレンズ(1)の光軸方向の進退を制御し合焦動作を行うフォーカス制御手段である。 (11) focus information display circuit (21) is a focus control means for controlling focusing operation forward and backward in the optical axis direction of the focus lens (1).

被写体からの光はフォーカスレンズ(1)を経て撮像素子(2)上に結像され、撮像映像信号として出力される。 Light from a subject is imaged on the image sensor (2) via the focusing lens (1), is output as a captured image signal. この撮像映像信号はゲート回路(3)、同期分離回路(4)及びフォーカス情報表示回路(9)に供給される。 The captured image signal is a gate circuit (3), is supplied to the sync separator (4) and the focus information display circuit (9).

同期分離回路(4)は撮像映像信号により垂直同期信号及び水平同期信号を分離し、タイミング発生回路(5)は前記両同期信号及び撮像素子(2)の駆動にも用いられた固定の発振器出力に基づいて、第2図(a) Sync separator (4) separates the vertical synchronizing signal and the horizontal synchronizing signal by the imaging video signal, the timing generator circuit (5) is the both synchronizing signals and the imaging element (2) oscillator output fixation was also used to drive the based on the second view (a)
(b)の如く、画面中央部分に長方形のサンプリングエリア、即ちフォーカスエリア(30)を設定し、フォーカスエリアの範囲内のみの撮像映像信号中の輝度信号の通過を許容するゲート開閉信号をゲート回路(3)に供給する。 (B) as the sampling area of ​​a rectangle on the screen center part, i.e. to set the focus area (30), a gate circuit opens the gate to allow passage of the luminance signal in the video image signal in only the range of the focus area supplied to (3). こうして、ゲート回路(3)によってフォーカスエリアの範囲内に対応する輝度信号のみが時分割的にBP Thus, the gate circuit (3) only the luminance signals corresponding to the range of the focus area by time division manner BP
F(12a)(12b)に供給される。 Is supplied to the F (12a) (12b).

BPF(12a)は第3図(a)如く600KHZ乃至2.4MHZの高域成分のみを抽出するもので、またBPF(12b)は、第3 BPF (12a) is intended to extract only the high-frequency component of the FIG. 3 (a) as 600KHZ to 2.4 MHz, also BPF (12b), the third
図(b)の如くBPF(12a)よりも低域成分をも含む200K FIG than (b) as BPF (12a) including a low-frequency component 200K
HZ乃至2.4MHZのカットオフ周波数を有している。 HZ to have a cutoff frequency of 2.4 MHz.

BPF(12a)(12b)出力は、夫々検波回路(13a)(13 BPF (12a) (12b) output, respectively the detection circuit (13a) (13
b)にて振幅検波された後に、ゼィジタル積分器(14a) At b) after being amplitude detection, Zijitaru integrator (14a)
(14b)にて1フィールド分についてディジタル積分が為される。 Digital integrator is made as one field at (14b). ここで、ディジタル積分器(14a)(14b) Here, the digital integrator (14a) (14b)
は、検波出力をA/D変換するA/D変換器と加算器(図示せず)を有し、1フィールド期間にわたる積分が終了する毎に積算値を出力する。 Is an adder and the A / D converter the detection output is converted A / D (not shown), and outputs the integrated value each time the integration over 1 field period is completed. こうして上述の如く、BPF(12 Thus, as described above, BPF (12
a)(12b)にて帯域が規定された輝度信号の各高域成分の1フィールド分の積分値(M)(N)は演算回路(合焦度検出手段)(15)に入力される。 a) (integrated value of one field of the high-frequency component of the luminance signal band is defined by 12b) (M) (N) is input to the arithmetic circuit (focusing degree detecting means) (15).

演算回路(15)は積分値(N)に対する積分値(M) Computing circuit (15) the integral value for the integral value (N) is (M)
の比を相対比(R)(R=M/N)として算出する。 Calculating the ratio of the relative ratio (R) (R = M / N). ところで、積分値(M)(N)とレンズ位置との関係は、第4図の如き特性の曲線となる。 Incidentally, the relationship between the lens position integral value (M) (N) is a curve of such characteristics of FIG. 4. 即ち、600KHZ以上の高域成分を対象とする積分値(M)は、合焦点近傍で急峻な変化を示す曲線となり、積分値(M)よりも低域成分を含む積分値(N)は緩やかな曲線となるが、常にN>M That is, the integral value to target more high-frequency components 600kHz (M) becomes a curve showing the abrupt change in focus near, the integral value integrated value containing low-frequency components than the (M) (N) is slowly becomes a curve, but always N> M
の関係が成り立ち、合焦点から離間するにつれてフォーカスがズレるとともに被写体の空間周波数の高い成分より減衰が始まるため、両積分値(M)(N)に大きな差が生じることになる。 Relationship holds is because the focus is shifted attenuation higher spatial frequency component of an object with beginning as away from the focal point, so that the large differences in both the integral value (M) (N) occurs.

そこで、相対比(R)と被写体のボケ度合(合焦点とのズレ量)との関係をグラフに示すと、第5図に示す様な単調減少特性曲線となる。 Therefore, the relative ratio (R) when showing the relationship between the blur degree of the subject (the amount of deviation between the focal point) in the graph, the monotonously decreasing characteristic curve as shown in Figure 5. これは、前記相対比なる状態量は、被写体の合焦状態(ボケ度合あるいは合焦点) This is the state quantity comprising the relative ratio, in-focus state of the subject (blur degree or focal point)
を表現できる関数値であり、比率で表現されているために一種の正規化された状態量であり、被写体のおかれている環境の影響をあまり受けにくい性質を有していることを示す。 A function value that can represent a normalized state quantity of one for being expressed in a ratio, indicating that it has a hard property less affected by environment surrounding the subject. 例えば、被写体の照度が変化した場合に、積分値自体は変化するが相対比(R)としては大きな変化はない。 For example, if the illuminance of the subject is changed, the integration value itself varies but no major change in the relative ratio (R). 通常、上記の性質は被写体の種類を問わぬものである故に、この相対比をボケ度合のパラメータとして使用することが可能となる。 Usually, due to the above properties are those unexpected any type of object, it is possible to use this relative ratio as a parameter of the blur degree. 上述の様に相対比(R) The relative ratio as described above (R)
は、ボケ度合あるいは合焦度を表わす状態量である故に、演算回路(15)は、この相対比(R)をフォーカス情報表示回路(11)に供給する。 , Due the state quantity representing the blur degree, or degree of focus, the arithmetic circuit (15) supplies the relative ratio (R) to the focus information display circuit (11).

フォーカス情報表示回路(11)は、ディジタル値である相対比(R)を%表示にて、キャラクタジェネレータを用いて撮像映像信号にスーパーインポーズして、第6 Focus information display circuit (11), the relative ratio is a digital value with a percentage (R), and superimposed on the captured video signal by using a character generator, 6
図(a)(b)の如くビューファインダ(10)上にオンスクリーン表示する。 On-screen display on the FIG (a) (b) viewfinder as (10). 第9図(a)は相対比(R)が0. Figure 9 (a) the relative ratio (R) is 0.
32とピンボケ状態にあることを示しており、(b)はR Indicates that it is in 32 and out-of-focus state, (b) the R
=0.90と略合焦状態にあることを示している。 = Indicates that the 0.90 and Ryakugo focus condition. 従って、 Therefore,
使用者は、この相対比(R)を目安にしてマニュアルフォーカス制御を実行すればよいことになる。 User, it is sufficient to perform the manual focus control with the relative ratio (R) as a guide.

フォーカス情報表示回路(11)としては、第2図(a)(b)の如くキャラクタジェネレータを用いてフォーカスインジケータ(31)を撮像映像信号中に表示してもよい。 The focus information display circuit (11), the second diagram the (a) (b) focus indicator (31) using a character generator as may be displayed in the video image signal. あるいはビューファインダ(10)内のCRTと同一視野内に配置したLEDやLCD等によって行うことも可能である。 Or it can also be performed by LED or LCD or the like arranged in the viewfinder (10) of the CRT and in the same field of view.

尚、相対比(R)をオートフォーカス制御時にピンボケ度合としてフォーカスモータの駆動制御のパラメータに用いることが可能であることは言うまでもない。 Incidentally, it is needless to say that can be used relative ratio (R) to a parameter of the drive control of the focus motor as out-of-focus degree when autofocus control.

また、本実施例においてBPF(12a)(12b)のカットオフ周波数の上限である2.4MHZは、輝度信号のとり得る帯域よりも十分に高く設定されている。 Further, 2.4 MHz, which is the upper limit of the cutoff frequency of the present embodiment BPF (12a) (12b) is set sufficiently higher than the bandwidth that can be taken of the luminance signal.

(ト) 発明の効果 上述の如く本発明によれば、ビューファインダ上の画面を見ながら被写体のおかれている環境の影響を受けにくい合焦度を認識して迅速で且つ正確なフォーカス制御が可能となる。 According to the present invention as the effect described above in (g) the invention, rapid and accurate focus control recognizes the hard focus degree of the influence of environment surrounding the subject while viewing the screen on the viewfinder It can become.


第1図乃至だい6図は本発明の実施例に係り、第1図は回路ブロック図、第2図(a)(b)はビューファインダ上の画面を示す図、第3図(a)(b)はBPFの特性図、第4図はレンズ位置と積分値との関係図、第5図はボケ度合と相対比との関係図、第6図(a)(b)はビューファインダ上の画面を示す図である。 Figure 1 to Figure 6 relates to an embodiment of the present invention, FIG. 1 is a circuit block diagram, Fig. 2 (a) (b) is a diagram showing a screen on the viewfinder, FIG. 3 (a) ( b) the characteristic diagram of BPF, Figure 4 is graph showing the relationship between the integrated value and the lens position, Figure 5 is graph showing the relationship between blur degree and the relative ratio, FIG. 6 (a) (b) is on the viewfinder it is a diagram showing a screen. (10)……ビューファインダ、(21)……フォーカス制御手段、 (12a)(12b)……バンドパスフィルタ、(14a)(14 (10) .... viewfinder (21) .... the focus control device, (12a) (12b) ... bandpass filter, (14a) (14
b)……デジタル積分器、(15)……演算回路(合焦度検出手段)。 b) ...... digital integrator (15) ... operation circuit (focusing degree detecting means).

Claims (1)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】撮像画面を映出するビューファインダと、 被写体に対するフォーカス制御を為すフォーカス制御手段と、 撮像映像信号の高域成分を抽出する第1フィルタ手段と、 前記第1フィルタ手段よりも低いカットオフ周波数を有し且つ撮像映像信号の高域成分を抽出する第2フィルタ手段と、 前記第1フィルタ手段の出力を所定期間積分し第1積分値を得る第1積分手段と、 前記第2フィルタ手段の出力を前記所定期間積分し第2 [1 claim: a viewfinder for Utsude the imaging screen, a focus control unit which forms a focusing control with respect to the subject, a first filter means for extracting a high frequency component of the video image signal is lower than said first filter means a second filter means for extracting a high frequency component of and imaged video signal having a cutoff frequency, a first integrating means for obtaining a first integral value to a predetermined time period integrates the output of the first filter means, said second wherein the output of the filter means predetermined period integrating second
    積分値を得る第2積分手段と、 前記第1積分値と前記第2積分値の比を算出し被写体の合焦度を検出する検出手段とを備え、 前記合焦度を前記ビューファインダに表示することを特徴とする撮像装置。 Second integrating means for obtaining an integral value, and detecting means for detecting the degree of focus of the ratio to calculate the object of the second integrated value and the first integrated value, displaying the degree of focus on the viewfinder imaging apparatus characterized by.
JP14709189A 1989-06-09 1989-06-09 Imaging device Expired - Lifetime JP2869086B2 (en)

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KR100840235B1 (en) 2001-08-29 2008-06-20 삼성전자주식회사 Liquid crystal display device
JP4198449B2 (en) 2002-02-22 2008-12-17 富士フイルム株式会社 Digital camera
JP2004297751A (en) 2003-02-07 2004-10-21 Sharp Corp Focusing state display device and focusing state display method
US7248301B2 (en) 2003-05-02 2007-07-24 Hewlett-Packard Development Company, L.P. System and method for providing camera focus feedback
US9690168B2 (en) 2006-11-20 2017-06-27 Red.Com, Inc. Focus assist system and method
JP4913609B2 (en) * 2007-01-16 2012-04-11 株式会社ミツトヨ Hardness Tester
JP4535114B2 (en) 2007-10-26 2010-09-01 ソニー株式会社 An imaging apparatus and an imaging method, a display control apparatus and display control method, and program
WO2012154585A1 (en) * 2011-05-06 2012-11-15 Red. Com, Inc. Focus assist system and method

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