KR0124588B1 - Method for zoom tracking of video camera - Google Patents

Method for zoom tracking of video camera

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Publication number
KR0124588B1
KR0124588B1 KR1019930008819A KR930008819A KR0124588B1 KR 0124588 B1 KR0124588 B1 KR 0124588B1 KR 1019930008819 A KR1019930008819 A KR 1019930008819A KR 930008819 A KR930008819 A KR 930008819A KR 0124588 B1 KR0124588 B1 KR 0124588B1
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KR
South Korea
Prior art keywords
zoom
zoom lens
lens
outermost
focus
Prior art date
Application number
KR1019930008819A
Other languages
Korean (ko)
Other versions
KR940027505A (en
Inventor
이승억
Original Assignee
구자홍
엘지전자주식회사
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by 구자홍, 엘지전자주식회사 filed Critical 구자홍
Priority to KR1019930008819A priority Critical patent/KR0124588B1/en
Priority to CN94107585A priority patent/CN1039274C/en
Publication of KR940027505A publication Critical patent/KR940027505A/en
Priority to US08/540,238 priority patent/US5815203A/en
Application granted granted Critical
Publication of KR0124588B1 publication Critical patent/KR0124588B1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0053—Driving means for the movement of one or more optical element

Abstract

a zoom lens(1); a focus lens(10) for focusing a pictured image; a CCD(13) converting the image passed through said zoom lens(1) and focus lens(10) to current signals; a focus estimation value detecting means(15) detecting the focus estimation value of output image signal of said CCD(13); a position detecting means detecting the positions of said zoom lens(1) and focus lens(10); and a micom(7) controlling zoom tracking by calculating the distance of the pictured object as the position data of the zoom lens(1) and focus lens(10) in maximum point of focus estimation values; is disclosed. Thereby, the focus lens can accurately pursuit the trace of the zoom lens when the zoom lens moves.

Description

비디오 카메라의 줌트래킹 방법Zoom tracking method of video camera

제1도는 종래 기술의 줌트래킹 장치를 나타낸 블럭구성도.1 is a block diagram showing a zoom tracking device of the prior art.

제2도 및 제3도는 종래 기술의 줌렌즈 위치에서의 피사체 거리에 따른 촛점렌즈의 트레이스 궤적도.2 and 3 are trace locus diagrams of a focus lens according to a subject distance at a zoom lens position of the prior art.

제4도는 상기 제3도중 와이드단의 트레이스 궤적을 상세하게 나타낸 트레이스 궤적 상세도.FIG. 4 is a detailed trace trace showing detail of a trace of the wide end of the third diagram.

제5도는 본 발명의 줌트래킹 장치를 나타낸 블럭구성도.5 is a block diagram showing a zoom tracking device of the present invention.

제6도, 9도, 10도, 11도, 12도는 본 발명의 줌렌즈 위치에서의 피사체거리에 따른 촛점렌즈의 트레이스 궤적도.6, 9, 10, 11, and 12 are trace locus diagrams of a focus lens according to a subject distance at a zoom lens position of the present invention.

제7도는 본 발명의 줌트래킹 방법을 나타낸 상세흐름도.7 is a detailed flowchart showing the zoom tracking method of the present invention.

제8도는 상기 제6도중 리드에러에 의해 피사체거리에 대한 트레이스궤적이 잘못 판단되지 않는 지점의 트레이스 궤적상세도이다.FIG. 8 is a trace trace detail diagram of a point at which the trace trace with respect to the object distance is incorrectly determined by the lead error in FIG. 6.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 줌렌즈2 : 줌위치센서1: Zoom lens 2: Zoom position sensor

3: 줌모터 구동부4,11 : 모터3: zoom motor driver 4,11: motor

5 : D/A 변환부6,24 : A/D 변환부5: D / A converter 6, 24: A / D converter

7 : 마이콤8 : 촛점위치센서7: micom 8: focus position sensor

9 : 촛점모터구동부10 : 촛점렌즈9: focus motor drive unit 10: focus lens

12 : 촛점위치검출부13 : CCD12: focus position detection unit 13: CCD

14 : 증폭부15 : 촛점평가치 검출부14: amplification unit 15: focus evaluation value detection unit

20,21 : 대역필터22 : 저역필터20,21: Band filter 22: Low pass filter

23 : 스위칭부25 : 게이트 어레이부23: switching unit 25: gate array unit

본 발명은 비디오 카메라(Video Camera)의 리어(rear) 촛점방식에 있어서, 특히 줌렌즈(zoom lens)가 이동할때 촛점렌즈가 트레이스 궤적을 정확하게 추적할 수 있도록 한 줌트래킹(tracking) 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear tracking method of a video camera, and more particularly to a zoom tracking method that enables a focus lens to accurately track a trace trajectory when a zoom lens moves.

종래의 리어 촛점방식에서의 줌트래킹을 위한 장치는 제1도에 나타나 있으며 그에 대한 설명은 다음과 같다.An apparatus for zoom tracking in a conventional rear focus method is shown in FIG. 1 and the description thereof is as follows.

먼저, 줌렌즈(1)의 현재 위치를 감지하기 위한 줌위치센서(2)는 가변저항(도면에 도시하지 않았음)을 구비하여 구성되어 줌모터 구동부(3)의 구동신호에 의해 구동되는 줌모터(4)에 의해 줌렌즈(1)가 이동함에 따라 D/A(Digital/Analog) 변환부(5)에 의해 가변저항에 인가되는 전압의 차로서 줌렌즈(1)의 각 위치를 검출할 수 있도록 한다.First, the zoom position sensor 2 for detecting the current position of the zoom lens 1 is provided with a variable resistor (not shown), which is driven by a drive signal of the zoom motor driver 3. As the zoom lens 1 moves by (4), each position of the zoom lens 1 can be detected as a difference of voltage applied to the variable resistor by the D / A (Digital / Analog) converter 5. .

A/D 변환부(6)는 상기 줌센서위치(2)의 가변저항에 인가되는 전압을 콘트롤화하여 마이콤(7)에 전송하여 마이콤(7)이 줌렌즈(1)의 현재 위치를 인식할 수 있도록 한다.The A / D converter 6 controls the voltage applied to the variable resistor of the zoom sensor position 2 and transmits it to the microcomputer 7 so that the microcomputer 7 can recognize the current position of the zoom lens 1. Make sure

또한 촛점위치센서(8)를 원점에 설치하여 스텝핑(Stepping)모터구동부(9)에 의해 구동되어 촛점렌즈(10)를 이동시키는 스텝핑 모터(11)의 구동스텝수를 촛점위치검출부(12)가 계산하여 상기 마이콤(7)에 전송함으로써 상기 마이콤(7)은 촛점렌즈(10)의 위치를 인식할 수 있게 된다.In addition, the focal position detection unit 12 installs the focal position sensor 8 at the origin and is driven by the stepping motor driving unit 9 to drive the number of driving steps of the stepping motor 11 to move the focal lens 10. By calculating and transmitting to the micom 7, the micom 7 can recognize the position of the focus lens 10.

이때 상기 마이콤(7) 내부의 롬에는 제2도와 같이 각 줌렌즈(1)의 위치에서의 피사체거리에 따른 촛점렌즈(10)의 트레이스 궤적이 저장되어 있으며 사용자가 주밍을 실행하기전에 마이콤(7)의 리드에러에 의해 피사체 거리에 대한 트레이스 궤적이 잘못판단되지 않는 지점에서 주밍(zooming)이 시작될 수 있도록(제3도 α)줌렌즈(1)를 위치시키고 줌렌즈(1)의 위치에 따라 촛점이 정확하게 이루어질 수 있는 지점에 촛점렌즈(10)를 위치시킨 뒤 주밍이 시작되는 지점(제3도 α)에서의 줌렌즈(1)의 위치정보와 촛점렌즈(10)의 위치정보로써 피사체의 거리(a,b,c)를 계산한다.At this time, the trace of the focus lens 10 according to the object distance at the position of each zoom lens 1 is stored in the ROM inside the microcomputer 7, and before the user performs zooming, the microcomputer 7 is stored. The zoom lens 1 is positioned so that zooming can be started at the point where the trace trajectory of the object distance is not judged incorrectly by the lead error of (Fig. 3), and the focus is accurately adjusted according to the position of the zoom lens 1 After positioning the focus lens 10 at the point where it can be made, the positional distance of the subject as the position information of the zoom lens 1 and the position information of the focus lens 10 at the point where zooming starts (FIG. 3). calculate b, c).

피사체의 위치가 상기 마이콤(7) 내부의 롬에 저장된 피사체거리(a,c)와 일치하면 줌렌즈(1)가 이동할 때 촛점렌즈(10)가 피사체 거리(a,c)에 따른 트레이스 궤적을 따라 이동할 수 있도록 하여 줌트래킹을 실현하였다.If the position of the subject coincides with the subject distances a and c stored in the ROM inside the microcomputer 7, the focus lens 10 moves along the trace trajectory according to the subject distances a and c when the zoom lens 1 moves. Zoom tracking is realized by moving.

그러나 마이콤(7) 내부의 롬에 피사체의 위치에 따른 트레이스 궤적 데이타가 저장되어 있지 않는 위치에(b) 주밍을 하고자 하는 피사체가 존재하면 마이콤(7) 내부의 롬에 저장된 피사체의 위치에 따른 트레이스 궤적 데이타중 주밍을 하고자 하는 피사체에 가까운 상,하 피사체 위치(a,c)에 따른 트레이스 궤적 데이타를 검출하여 주밍이 시작하는 지점(제3도 α)에서 상 피사체 위치(a)에 따른 촛점렌즈(10)와 하 피사체위치(c)에 따른 촛점렌즈(10)의 위치차(Da)를 계산하고, 주밍을 하고자 하는 피사체의 위치(b)에 따른 촛점렌즈(10)와 하 피사체 위치(c)에 따른 촛점렌즈(10)의 위치차(da)를 계산한후 줌렌즈(1)가 이동하고자 하는 지점(제3도 β)에서의 상 피사체 위치(a)에 따른 촛점렌즈(10)와 하 피사체 위치(c)에 따른 촛점렌즈(10)의 위치차(Db)를 계산하여 줌렌즈(1)가 이동하고자 하는 지점(제3도 β)에서의 주밍을 하고자 하는 피사체의 위치(b)의 따른 촛점렌즈(10)의 위치(db)를 계산하는데 이에 대한 계산식은 However, if there is a subject to zoom in at a position where the trace trajectory data according to the position of the subject is not stored in the ROM inside the microcomputer 7, (b) the trace according to the position of the subject stored in the ROM inside the microcomputer 7 is present. Focus lens according to the image subject position (a) at the point where zooming starts by detecting trace trace data according to the position of the subject (a, c) close to the subject to be zoomed among the trace data. Calculate the position difference Da of the focus lens 10 according to (10) and the lower subject position (c), and focus the lens 10 and the lower subject position (c) according to the position (b) of the subject to zoom. After calculating the position difference da of the focus lens 10 according to, the focus lens 10 and the lower position according to the position (a) of the image subject at the point to which the zoom lens 1 is to be moved (FIG. By calculating the position difference Db of the focus lens 10 according to the subject position c, the zoom lens ( 1) calculates the position (db) of the focus lens 10 according to the position (b) of the subject to zoom in at the point to be moved (Fig. 3 β).

Claims (4)

줌렌즈의 최외각 와이드 위치와 최외각 텔레위치의 중심부에 해당하는 임의의 한 영역을 기준으로 상기 최외각 텔레위치까지는 각 피사체거리에 해당하는 줌 궤적 데이타를 모두 저장하고, 상기 최외각 와이드 위치까지는 최대, 최소 피사체거리에 해당하는 줌 궤적 데이터만을 저장하는 제1단계와; 상기 줌렌즈의 위치가변에 따른 포커싱동작수행시 가변된 줌렌즈위치를 검출하는 제2단계와; 상기 제2단계의 검출결과 가변된 줌렌즈의 위치가 상기 줌렌즈의 최외각 와이드위치와 임의의 한 영역사이에 존재하면 상기 제1단계에서 저장한 최대, 최소 피사체거리에 해당하는 줌 궤적 데이터에 근거하여 입력되는 포커스평가치가 최대가 되는 위치로 포커싱 동작을 수행하는 제3단계를 포함하여 이루어짐을 특징으로 하는 비디오 카메라의 줌트래킹 방법.Based on an arbitrary area corresponding to the outermost wide position of the zoom lens and the center of the outermost tele position, all the zoom trajectory data corresponding to each object distance are stored up to the outermost tele position, and the maximum is up to the outermost wide position. Storing only zoom trajectory data corresponding to a minimum object distance; A second step of detecting a variable zoom lens position when performing a focusing operation according to a change in the position of the zoom lens; As a result of the detection of the second step, if the variable zoom lens position exists between the outermost wide position of the zoom lens and an arbitrary region, based on the zoom locus data corresponding to the maximum and minimum object distances stored in the first step, And a third step of performing a focusing operation to a position at which the input focus evaluation value is maximized. 제1항에 있어서, 상기 제2단계의 검출결과 가변된 줌렌즈의 위치가 상기 줌렌즈의 최외각 텔레위치와 임의의 한 영역 사이에 존재하면, 상기 제1단계에서 저장한 각각의 피사체거리에 해당하는 줌 궤적 데이터에 근거하여 포커싱동작을 수행하는 제4단계를 더 포함하여 이루어진 것을 특징으로 하는 비디오 카메라의 줌트래킹 방법.According to claim 1, If the position of the variable zoom lens is located between the outermost tele position of the zoom lens and any one area as a result of the detection of the second step, corresponding to the respective object distance stored in the first step And a fourth step of performing a focusing operation based on the zoom trajectory data. 제1항에 있어서, 상기 제3단계는 동작수행중 줌렌즈위치가 상기 최외각 텔레위치를 향하여 상기 임의의 한 영역을 통과할 때 추적중인 피사체거리를 산출하고 산출된 피사체거리에 해당하는 줌 궤적 데이터를 선택함을 특징으로 하는 비디오 카메라의 줌트래킹 방법.The zoom trajectory data of claim 1, wherein the third step calculates a subject distance being tracked when the zoom lens position passes the predetermined one toward the outermost tele position during the operation. Zoom tracking method of a video camera, characterized in that the selection. 제2항에 있어서, 상기 제4단계는 동작수행중 줌렌즈 위치가 상기 최외각 와이드위치를 향하영 상기 임의의 한 영역을 통과할 때 최대, 최소 피사체거리에 해당하는 줌 트레이스 궤적 데이터에 근거하여 입력되는 포커싱평가치가 최대가 되는 위치로 포커싱 동작을 수행함을 특징으로 하는 비디오 카메라의 줌트래킹 방법.3. The method of claim 2, wherein the fourth step is based on zoom trace trajectory data corresponding to the maximum and minimum subject distances when the zoom lens position passes the one wide area facing the outermost wide position during the operation. A zoom tracking method of a video camera, characterized in that for performing a focusing operation to a position where the focusing evaluation value is maximized.
KR1019930008819A 1993-05-20 1993-05-21 Method for zoom tracking of video camera KR0124588B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019930008819A KR0124588B1 (en) 1993-05-21 1993-05-21 Method for zoom tracking of video camera
CN94107585A CN1039274C (en) 1993-05-20 1994-05-20 Zoom tracking apparatus and method in video camera
US08/540,238 US5815203A (en) 1993-05-20 1995-10-05 Zoom tracking apparatus and method in a video camera

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Application Number Priority Date Filing Date Title
KR1019930008819A KR0124588B1 (en) 1993-05-21 1993-05-21 Method for zoom tracking of video camera

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KR940027505A KR940027505A (en) 1994-12-10
KR0124588B1 true KR0124588B1 (en) 1997-12-01

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KR20110016376A (en) * 2009-08-10 2011-02-17 삼성전자주식회사 Image processing apparatus and image processing method

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KR20110016376A (en) * 2009-08-10 2011-02-17 삼성전자주식회사 Image processing apparatus and image processing method

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