KR940010696A - Camcorder auto focus - Google Patents

Camcorder auto focus Download PDF

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Publication number
KR940010696A
KR940010696A KR1019920018824A KR920018824A KR940010696A KR 940010696 A KR940010696 A KR 940010696A KR 1019920018824 A KR1019920018824 A KR 1019920018824A KR 920018824 A KR920018824 A KR 920018824A KR 940010696 A KR940010696 A KR 940010696A
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KR
South Korea
Prior art keywords
signal
adder
value
high frequency
evaluation value
Prior art date
Application number
KR1019920018824A
Other languages
Korean (ko)
Inventor
한병완
Original Assignee
이헌조
주식회사 금성사
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.)
Filing date
Publication date
Application filed by 이헌조, 주식회사 금성사 filed Critical 이헌조
Priority to KR1019920018824A priority Critical patent/KR940010696A/en
Publication of KR940010696A publication Critical patent/KR940010696A/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
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • 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
    • G03B13/36—Autofocus systems
    • 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
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

본 발명은 캠코더의 자동촛점 조절장치에 관한 것으로서, 이는 촬영자의 손떨림이나 피사체의 미진에 의해 발생되는 촛점평가치의 변화에 대해 정확하게 자동촛점이 되도록 한 것이다.The present invention relates to an automatic focus adjusting apparatus of a camcorder, which accurately corrects the focus of change of the focus evaluation value caused by the camera shake or the subject's fineness.

이와 같은 본 발명은 화면중앙에 설정된 제1샘플링영역과 이 영역을 포함하여 면전이 큰 제2샘플링영역에 있어서의 제1, 제2고역필터부를 통해 필터링되어 얻어지는 촬상영상신호의 고주파성분을 일정시간마다 선택하는 신호선택부와, 상기 신호선택부에서 선택한 제1, 제2샘플링영역에 대한 고주파성분을 디지탈신호로 변환하는 아날로그/디지탈변환부와, 상기 변환된 고주파성분을 특정영역에 대해 적분하여 합신호를 구하는 영역덧셈기와, 상기 변환된 디지탈신호의 고역성분과 설정된 각각의 기준신호를 비교하는 적어도 하나이상의 비교부와, 상기 비교부의 출력값이 기준값과 같을때의 갯수를 구하는 가산기와, 상기 각각의 가산기의 출력값과 특정영역에 대해 구한 합신호를 연산하여 촛점평가치를 산출하는 촛점평가치 산출부로 구성함으로써 달성되는 것이다.As described above, the present invention provides the first sampling region set in the center of the screen and the high frequency component of the captured image signal obtained by filtering the first and second high pass filters in the second sampling region including the large face. A signal selector for selecting each signal, an analog / digital converter for converting high frequency components of the first and second sampling regions selected by the signal selector into a digital signal, and integrating the converted high frequency components with respect to a specific region An area adder for obtaining a sum signal, at least one comparison unit for comparing the high frequency component of the converted digital signal with each set reference signal, an adder for calculating the number of times when the output value of the comparison unit is equal to the reference value, It consists of a focus evaluation value calculating section that calculates the focus evaluation value by calculating the output value of the adder and the sum signal obtained for the specific area. It will be achieved.

Description

캠코더의 자동촛점 조절장치Camcorder auto focus

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 본 발명 캠코더의 자동촛점조절 시스템 구성도,3 is a block diagram of an automatic focus control system of a camcorder of the present invention;

제4도는 제3도의 촛점평가치 산출부에 대한 상세도,4 is a detailed view of the focus evaluation calculator of FIG.

제5도는 제3도의 촛점평가치 산출설명에 대한 각부의 출력파형도,5 is an output waveform diagram of each part for explaining the calculation of the focus evaluation value of FIG.

제6도는 제3도의 샘플링영역에 대한 분할 설명도,6 is a diagram illustrating division of the sampling area of FIG. 3;

제7도는 본 발명 포커스렌즈의 위치변화에 수반하는 촛점평가치의 변동을 보인도.7 is a view showing a change in focus evaluation value accompanying a change in position of the focus lens of the present invention.

Claims (2)

화면중앙에 설정된 제1샘플링영역과 이 영역을 포함해 면적이 큰 제2샘플링영역에 있어서의 제1, 제2고열필터부(8)(9)를 통해 필터링되어 얻어지는 촬상영상신호의 고주파성분을 일정기간마다 선택하는 신호선택부(10)와, 상기 신호선택부(10)에서 선택한 제1, 제2샘플링영역에 대한 고주파성분을 디지탈신호로 변환하는 아날로그/디지탈변환부(11)와, 상기 변환된 고주파성분을 특정영역에 대해 적분하여 합신호를 구하는 영역덧셈기(12)와, 상기 변환된 디지탈신호의 고역성분과 설정된 각각의 기준신호를 비교하는 적어도 하나이상의 비교부(13-1) ‥‥ (13-n)와, 상기 비교부의 출력값이 기준신호와 같을 때의 갯수를 구하는 가산기(14-1) ‥‥ (14-n)와, 상기 각각의 가산기의 출력값과 특정영역에 대해 구한 합신호를 연산하여 촛점평가치로 포커스렌즈(1)를 제어하는 춧점평가치 산출부(15)를 포함하여 된 캠코더의 자동 촛점 조절장치.The high frequency component of the captured image signal obtained by filtering through the first and second high heat filter units 8 and 9 in the first sampling region set in the center of the screen and the second sampling region including the large area is obtained. A signal selector 10 for selecting at a predetermined time period, an analog / digital converter 11 for converting high frequency components of the first and second sampling regions selected by the signal selector 10 into digital signals, and An area adder 12 for integrating the converted high frequency components with respect to a specific area to obtain a sum signal, and at least one comparison unit 13-1 for comparing the high frequency component of the converted digital signal with each set reference signal. (13-n), an adder (14-1) for calculating the number of times when the output value of the comparator is equal to the reference signal. (14-n) and a sum obtained for the output value and the specific region of each adder. Signal to calculate the focus lens (1) Automatic focus adjustment of the camera, including chutjeom evaluation value calculation unit 15 to control. 제1항에 있어서, 촛점평가치 산출부(15)는 상기 각각의 가산기로부터 구하여진 휘도신호의 높은 값에 대해 가중치를 부가하는 레벨가중치(15a1)‥‥(15an)와, 상기 레벨가중치에서 구하여진 레벨가중값 가산하는 덧셈기(15b)와, 상기 덧셈기(15b)로부터 가산된 1필드분의 고역성분값과 영역덧셈기(12)에서 구한 합신호를 제산하여 촛점평가치를 산출하는 제산기(15c)로 구성함을 특징으로 한 캠코더의 자동 촛점 조절장치.2. The focus evaluation value calculating section (15) according to claim 1, wherein the focus evaluation value calculation section (15) obtains a level weight value (15a1) ... (15an) that adds a weight to a high value of the luminance signal obtained from each of the adders, and calculates the value from the level weight value. An adder 15b that adds a true level weight value, and a divider 15c that calculates a focus evaluation value by dividing a high-band component value for one field added from the adder 15b and a sum signal obtained by the area adder 12. Camcorder automatic focusing device characterized by the configuration. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920018824A 1992-10-13 1992-10-13 Camcorder auto focus KR940010696A (en)

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KR1019920018824A KR940010696A (en) 1992-10-13 1992-10-13 Camcorder auto focus

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KR1019920018824A KR940010696A (en) 1992-10-13 1992-10-13 Camcorder auto focus

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KR940010696A true KR940010696A (en) 1994-05-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100429858B1 (en) * 1997-05-21 2004-06-16 삼성전자주식회사 Apparatus and method for adjusting focus using adaptive filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100429858B1 (en) * 1997-05-21 2004-06-16 삼성전자주식회사 Apparatus and method for adjusting focus using adaptive filter

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