KR960028201A - Autofocus data compensation method in low light - Google Patents

Autofocus data compensation method in low light Download PDF

Info

Publication number
KR960028201A
KR960028201A KR1019940032751A KR19940032751A KR960028201A KR 960028201 A KR960028201 A KR 960028201A KR 1019940032751 A KR1019940032751 A KR 1019940032751A KR 19940032751 A KR19940032751 A KR 19940032751A KR 960028201 A KR960028201 A KR 960028201A
Authority
KR
South Korea
Prior art keywords
data
gain control
autofocus
noise
value
Prior art date
Application number
KR1019940032751A
Other languages
Korean (ko)
Other versions
KR0181282B1 (en
Inventor
윤수원
Original Assignee
김광호
삼성전자 주식회사
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 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019940032751A priority Critical patent/KR0181282B1/en
Publication of KR960028201A publication Critical patent/KR960028201A/en
Application granted granted Critical
Publication of KR0181282B1 publication Critical patent/KR0181282B1/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—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

Landscapes

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

Abstract

본 발명은 저조도 촬영시 자동게인 콘트롤(Auto Gain Control)을 거쳐 입력되는 오토 포커스 데이타를 자동 게인 콘트롤의 변화와 관계없는 오토 포커스 데이타로 보상하여 정확하고 신속하게 오토 포커스를 조정할수 있도록 하는 저조도 촬영시 오토 포커스 데이타 보상 방법에 관한 것으로, 본 발명은 캠코더의 조리개를 닫은 상태에서 자동 게인 콘트롤을 최소로 하여 오토 포커스 데이타를 읽는 노이즈 최소값 검출 단계와, 조리개를 닫은 상태에서 자동 게인 콘트롤을 최대로 하여 오토 포커스 데이타를 읽는 노이즈 최대값 검출 단계와, 조리개를 열어 현재의 자동 게인 콘트롤값을 읽는 단계와, 상기 단계에서 읽혀진 값을 이용하여 현재 오토 포커스 데이타중의 노이즈량을 구하는 현재 노이즈 검출 단계와, 읽혀진 데이타를 이용하여 자동 게인 콘트롤과 관련 없는 오토 포커스 데이타를 구하는 보상 데이타 검출 단계를 수행 시킴으로써 이루어진다.The present invention compensates the auto focus data input via the auto gain control during low light shooting with auto focus data irrelevant to the change of the auto gain control, so that the auto focus can be adjusted accurately and quickly. The present invention relates to a method for compensating autofocus data, and the present invention relates to a method for detecting a minimum noise value for reading autofocus data by minimizing an automatic gain control in a state in which a camcorder is closed, and a maximum auto gain control in a state in which the aperture is closed. Detecting the maximum noise value for reading the focus data, reading the current automatic gain control value by opening the iris, and detecting the amount of noise in the current autofocus data using the value read in the above step, Automatic Gain Control Using Data Irrelevant achieved by performing the compensation data detection step of obtaining the autofocus data.

Description

저조도 좔영시 오토포커스 데이타 보상방법Autofocus data compensation method in low light

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

제1도는 오토 포커스(Auto Focus)시스템의 개략도, 제2도는 본 발명의 오토 포커스 데이타 보정 플로우 차트.1 is a schematic diagram of an auto focus system, and FIG. 2 is an auto focus data correction flow chart of the present invention.

Claims (3)

오토 포커스 기능을 갖춘 촬영기의 오토 포커스 방법에 있어서, 조리개를 닫은 상태에서 자동 게인 콘트롤을 최소로 하여 오토 포커스 데이타를 읽는 노이즈 최소값 검출 단계와, 조리개를 닫은 상태에서 자동 게인 콘트롤을 최대로 하여 오토 포커스 데이타를 읽는 노이즈 최대값 검출 단계와, 조리개를 열어 현재의 자동 게인 콘트롤값을 읽는 단계와, 상기 단계에서 읽혀진 값을 이용하여 현재 오토 포커스 데이타중의 노이즈량을 구하는 현재 노이즈 검출 단계와,읽혀진 데이타를 이용하여 자동 게인 콘트롤과 관련 없는 오토 포커스 데이타를 구하는 보상 데이타 검출 단계를 수행 시킴으로써 이루어지는 것을 특징으로 하는 저조도 촬영시 오토 포커스 데이타 보상 방법.In the autofocus method of a camera equipped with an autofocus function, a minimum noise detection step of reading autofocus data with the auto gain control minimized while the aperture is closed, and an auto focus control with the auto gain control maximized while the aperture is closed Detecting the maximum noise value for reading data, reading the current automatic gain control value by opening the aperture, and detecting the amount of noise in the current autofocus data using the value read in the above step, and reading the data And performing a compensation data detection step of obtaining autofocus data irrelevant to auto gain control by using the auto focus data compensation method. 제1항에 있어서, 현재 노이즈 검출 단계의 노이즈량은 다음식에 의하여 구해 지는 것을 특징으로 하는 저조도 촬영시 오토 포커스 데이타 보상 방법.The method of claim 1, wherein the amount of noise in the current noise detection step is obtained by the following equation. NOISEnow = (NOISEmax - NOISEmin) *+ NOISEmin *NOISEnow = (NOISEmax-NOISEmin) * + NOISEmin * (AGCmax - AGCmin)(AGCmax-AGCmin) 여기서 AGCmax는 자동 게인 콘트롤의 최대값, AGCmin는 자동 게인 콘트롤의 최소값, NOISEmin는 자동 게인 콘트롤 최소값에서의 오토 포커스 데이타(NOISE), NOISEmax는 자동 게인 콘트롤 최대값에서의 오토 포커스 데이타(NOISE), AGCcon는 현재 자동 게인 콘트롤값, NOISEnow는 현재 오토 포커스 데이타중의 노이즈값이다.Where AGCmax is the maximum value of the automatic gain control, AGCmin is the minimum value of the automatic gain control, NOISEmin is the autofocus data (NOISE) at the minimum value of the automatic gain control, and NOISEmax is the autofocus data (NOISE) and AGCcon at the maximum value of the automatic gain control. Is the current auto gain control value, and NOISEnow is the noise value in the current auto focus data. 제1항에 있어서, 보상 데이타 검출 단계의 보상된 오토 포커스 데이타는 다음식에 의하여 구해 지는것을특징으로 하는 저조도 촬영시 오토 포커스 데이타 보상 방법.The method of claim 1, wherein the compensated autofocus data of the compensation data detection step is obtained by the following equation. AF DATAcmp = (AF DATAnow - NOISEnow) * AF DATAcmp = (AF DATAnow-NOISEnow) * 여기서 AF DATAnow는 현재 입력된 오토 포커스 데이타, AF DATAcmp는 보상된 오토 포커스 데이타이다.Where AF DATAnow is the currently input auto focus data, and AF DATAcmp is the compensated auto focus data. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940032751A 1994-12-01 1994-12-01 Method for compensating auto-focusing data at the time of photographing under low illuminance KR0181282B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940032751A KR0181282B1 (en) 1994-12-01 1994-12-01 Method for compensating auto-focusing data at the time of photographing under low illuminance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940032751A KR0181282B1 (en) 1994-12-01 1994-12-01 Method for compensating auto-focusing data at the time of photographing under low illuminance

Publications (2)

Publication Number Publication Date
KR960028201A true KR960028201A (en) 1996-07-22
KR0181282B1 KR0181282B1 (en) 1999-05-01

Family

ID=19400298

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019940032751A KR0181282B1 (en) 1994-12-01 1994-12-01 Method for compensating auto-focusing data at the time of photographing under low illuminance

Country Status (1)

Country Link
KR (1) KR0181282B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9210342B2 (en) 2013-12-13 2015-12-08 Hanwha Techwin Co., Ltd. Method and system for removing noise by controlling lens iris

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9210342B2 (en) 2013-12-13 2015-12-08 Hanwha Techwin Co., Ltd. Method and system for removing noise by controlling lens iris

Also Published As

Publication number Publication date
KR0181282B1 (en) 1999-05-01

Similar Documents

Publication Publication Date Title
US6879345B2 (en) Camera device which calculates brightness level ratios to determine backlighting from which exposure correction is made
KR930022851A (en) Image control device having image quality control function and image quality control method
KR950033545A (en) Zoom lens unit
JP2009109782A (en) Zoom camera
JP4766692B2 (en) IMAGING DEVICE, ITS CONTROL METHOD, PROGRAM, AND STORAGE MEDIUM
US20090290859A1 (en) Image pickup device and method of correcting camera shake of the image pickup device
US8411163B2 (en) Auto exposure controlling device and method
KR960028201A (en) Autofocus data compensation method in low light
US20040179111A1 (en) Imaging device
JP2007124245A (en) Imaging apparatus and its parameter setting method
JP2879569B2 (en) Imaging device
JPH11289487A (en) Image pickup device
KR100726435B1 (en) Method for controlling exposure quantity according distance of an object and photographing apparatus thereof
JP4388146B2 (en) Digital camera
JP2983763B2 (en) Video camera autofocus device
JPH09257570A (en) Photometer
JP3013122B2 (en) Electronic still camera
KR970006546B1 (en) Automatic shutter speed controlling method and apparatus using it
JP2005316030A (en) Automatic focusing device
JPH0566454A (en) Still video camera
JPH0795463A (en) Lens controller
JPS63123278A (en) Image pickup device
JPH05241064A (en) Camera provided with soft focusing function
KR920022033A (en) How to adjust the auto focus of the video camera
KR940025301A (en) Auto focusing device and method

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20041129

Year of fee payment: 7

LAPS Lapse due to unpaid annual fee