KR930003686A - Auto focusing circuit and method of video camera - Google Patents

Auto focusing circuit and method of video camera Download PDF

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KR930003686A
KR930003686A KR1019910013121A KR910013121A KR930003686A KR 930003686 A KR930003686 A KR 930003686A KR 1019910013121 A KR1019910013121 A KR 1019910013121A KR 910013121 A KR910013121 A KR 910013121A KR 930003686 A KR930003686 A KR 930003686A
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focus
signal
pass filter
drive motor
signals
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KR1019910013121A
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KR0130002B1 (en
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안병의
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강진구
삼성전자 주식회사
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Priority to KR1019910013121A priority Critical patent/KR0130002B1/en
Priority to GB9216179A priority patent/GB2258966A/en
Priority to JP4203837A priority patent/JPH05199445A/en
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28Systems for automatic generation of focusing signals
    • G02B7/36Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/12Systems for determining distance or velocity not using reflection or reradiation using electromagnetic waves other than radio waves
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B19/00Cameras
    • G03B19/18Motion-picture cameras
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K19/00Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/20Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12Analogue/digital converters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60Control of cameras or camera modules
    • H04N23/67Focus control based on electronic image sensor signals
    • H04N23/673Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60Control of cameras or camera modules
    • H04N23/63Control of cameras or camera modules by using electronic viewfinders

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

내용 없음.No content.

Description

비데오 카메라의 오토 포커싱회로 및 방법Auto focusing circuit and method of video camera

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

제2도는 이 발명에 따른 비데오 카메라의 오토 포커싱 회로도,2 is an auto focusing circuit diagram of a video camera according to the present invention;

제3도(가),(나)는 제2도 신호분리기의 상세회로도 및 입력파형도,3 (a) and (b) are detailed circuit diagrams and input waveform diagrams of the signal separator of FIG.

제4도(가),(나)는 제2도 신호 분리기의 신호를 게이팅하는 관계 파형도 및 모니터링된 비데오 화면 도식도,4 (a) and (b) show the relationship waveform diagram gating the signal of the second degree signal splitter and the monitored video screen schematic,

제5도는 제2도 곱셈기와 가산기의 가중치 부여와 가산의 도식적 표현도,5 is a schematic representation of the weighting and addition of the second multiplier and the adder,

제6도는 이 발명에 따른 비데오 카메라의 오토 포커싱 방법을 수행하기 위한 흐름도이다.6 is a flowchart for performing an auto focusing method of a video camera according to the present invention.

Claims (5)

입력되는 비데오 신호 성분 중 휘도신호(Y)를 디지탈 신호로 변환시키는 아날로그 디지탈 변환기(ADC1)와, 상기 아날로그 디지탈 변환기(ADC1)에 연결되어 디스플레이면의 비데오 신호의 특정부분을 추출한 후 가중치를 부가하여 디스플레이면 전체의 포커스가 맞도록 하는 포커스 조정회로(100)와, 상기 포커스 조정회로(100)에 연결되어 오토 포커싱시 순차적으로 절환되는 스위칭부(200)와, 상기 스위CLD부(200)에 연결되어 저주파 대역으로 부터 고주파 대역까지 넘은 주파수 대역에 걸쳐 포커싱이 도디로고 하는 밴드 패스 필터부(300)와, 상기 밴드 패스 필터부(300)에 연결되어 상기 밴드 패스 필터부(300)로 부터의 신호를 일시 저장하는 램(RAM)과, 상기 램(RAM)에 연결되어 상기 밴드 제스 필터부(300) 및 램(RAM)으로부터의 신호를 비교하여 포커스구동모터의 동작을 감지하는 비교기(400)와, 상기 비교기(400)에 연결되어 상기 비교기(400)로부터 입력되는 신호를 딜레이시키는 딜레이부(500)와, 포커스를 오토로 할 것인지 수동으로 할 것인지를 결정하는 조작 스위치(SW2)와, 상기 조작 스위치(SW2) 및 비교기(400) 및 딜레이부(500)에 연결되어 상기 딜레이부(500)의 딜레이 전후의 신호의 크기를 비교하여 포커스 구동모터의 회전방향을 감지하여 오토 포커싱 제어신호(C1),(C2)를 제어하여 포커스 구동모터의 회전방향을 제어하는 중앙 처리장치(CPU)와, 로구성되는 비데오 카메라의 오토 포커싱 회로.The analog digital converter ADC1 converts the luminance signal Y into a digital signal among the input video signal components, and extracts a specific part of the video signal on the display surface by adding weights after being connected to the analog digital converter ADC1. A focus adjustment circuit 100 for focusing the entire display surface, a switching unit 200 connected to the focus adjustment circuit 100 and sequentially switched during auto focusing, and a switch CLD unit 200. And a band pass filter unit 300 which focuses on the frequency band from the low frequency band to the high frequency band and the band pass filter unit 300 connected to the band pass filter unit 300. RAM is temporarily stored, and is connected to the RAM to compare the signals from the band Jess filter unit 300 and RAM to operate the focus driving motor. A comparator 400 for detecting a signal, a delay unit 500 connected to the comparator 400 for delaying a signal input from the comparator 400, and an operation for determining whether to focus automatically or manually It is connected to the switch SW2, the operation switch SW2, the comparator 400 and the delay unit 500 to detect the rotation direction of the focus driving motor by comparing the magnitudes of the signals before and after the delay of the delay unit 500. And a central processing unit (CPU) for controlling the rotation direction of the focus drive motor by controlling the auto focusing control signals (C1) and (C2). 제1항에 있어서, 상기 포커스조정회로(100)는, 상기 아날로그 디지탈 변환기(ACD1)에 연결되어 디스플레이면의 비데오 신호의 특정부분을 추출하는 신호 분리부(110)와, 상기 신호분리부(110)에 연결되어 상기 신호분리부(110)에 의해 추출된 신호에 가중치를 부가하는 가중치 부가부(120)와, 상기 가중치 부가부(120)에 연결되어 상기 가중치 부가부(120)의 각 신호를 논리곱하여 디스플레이면의 각 부분의 가중치를 다르게 설정하는 가산기(ADD1)와, 로 구성된 비데오 카메라의 오토 포커싱 회로.The signal adjusting unit (100) of claim 1, wherein the focus adjusting circuit (100) is connected to the analog digital converter (ACD1) and extracts a specific portion of a video signal on a display surface. The weight adder 120 is connected to the weight adder 120 to add a weight to the signal extracted by the signal separator 110 and the weight adder 120 is connected to each of the signals of the weight adder 120. And an adder (ADD1) for differently setting the weights of the respective portions of the display surface by logical AND, and the auto focusing circuit of the video camera. 조작 스위치(SW2)가 오토로 되면 포커스 구동모터를 회전시켜 초기치를 셋팅하는 준비루틴(11)을 수행하고, 상기 준비루틴(11)수행후, 밴드 패스 필터부(370) 및 램(RAM)으로 부터의 신호(S9),(S10)의 차를 포커스 구동모터가 움직 인 다음의 상태의 값(△)과 비교하여 비데오 카메라가 움직이는 것에 따른 포커스 변화를 감지하는 스텝(LS4)을 수행하며, 상기 스텝(LS4)에서 포커스 구동모터가 움직인 다음의 상태의 값(△)이 작다고 판단되면 딜FP이부(500)의 딜레이 전후의 신호(S11),(S14)의 크기를 비교하여 포커스구동모터의 회전방향을 감지하여 포커스 구동모터의 회전방향이 맞지않다고 판단되면 오토 포커싱 제어 신호(C1),(C2)값을 제설정한 후 포커스 구동모터의 회전방향을 재조사하는 포커스 구동모터 회전방향 감지루틴(12)을 수행하고, 상기 스텝(LS4)에서 포커스 구동모터가 움직인 다음의 상태의 값(△)이 크면 포커스가 맞은 것이므로 포커스 구동모터를 일시정지 후, 밴드패스 필터부(300)를 높은 주파수대의 것으로 절환하면서 포커스를 맞추는 포커스 상태 조사루틴(L3)을 수행하도록, 이루어지는 비데오 카메라의 오토 포커싱 방법.When the operation switch SW2 is set to auto, the preliminary routine 11 for setting the initial value by rotating the focus drive motor is performed. After the preliminary routine 11 is performed, the band pass filter 370 and the RAM are performed. Comparing the difference between the signals S9 and S10 with the value? Of the state after the focus driving motor is moved, and performing a step LS4 of detecting a focus change according to the movement of the video camera. If it is determined in step LS4 that the value? Of the state after the focus drive motor is moved is small, the magnitudes of the signals S11 and S14 before and after the delay of the deal FP 500 are compared to determine the focus drive motor. If it is determined that the rotational direction of the focus driving motor is not correct by detecting the rotational direction, the focus driving motor rotational direction detection routine for re-investigating the rotational direction of the focusing driving motor after resetting the auto focusing control signals C1 and C2 is performed. 12), and in step LS4, If the value (△) of the state after the drive motor is large is in focus, the focus state irradiation routine for focusing while the focus drive motor is paused and then switching the band pass filter unit 300 to a high frequency band L3), the method of auto focusing of the video camera. 제3항에 있어서, 상기 포커스 구동 모터 회전 방향 감지 루틴(L2)은, 딜레이부(500)의 딜레이 전후의 신호(S11),(S14)의 크기를 비교하는 스텝(L2S1)을 수행하고, 상기 스텝(L2S1)에서 딜레이된 신호(S14)가 딜레이전 신호(S11)보다 작으면 포커스 구동모터의 회전방향이 잘못된 것이므로 오토 포커싱 제어신호(C1),(C2)값을 재설정하여 바꾸는 스텝(L2S2)을 포커스 구동모터의 회전방향을 수행하며, 상기 스텝(L2S2)수행 후, 밴드 패스 필터부(300)로 부터의 신호(S9)를 램(RAM)에 저장하는 스텝(L2S3)을 수행하도록, 이루어진 비데오 카메라의 오토 포커싱 방법.4. The method of claim 3, wherein the focus driving motor rotation direction detection routine L2 performs a step L2S1 comparing the magnitudes of the signals S11 and S14 before and after the delay of the delay unit 500. If the signal S14 delayed in step L2S1 is smaller than the delay signal S11, the direction of rotation of the focus drive motor is wrong. Therefore, the auto focusing signals C1 and C2 are reset and changed to reset the value L2S2. To perform the rotation direction of the focus drive motor, and to perform the step (L2S3) of storing the signal (S9) from the band pass filter unit 300 in the RAM after performing the step (L2S2). How to auto focus video cameras. 제3항에 있어서, 상기 포커스상태 조사루틴(L3)은, 오토 포커싱 제어신호(C1),(C2)를 제로로하여 포커스 구동모터를 일시 정지하는 스텝(L3S1)을 수행하고, 상기 스텝(L3S1)수행후, 밴드 패스 필터부(300)의 주파수가 가장 높은 주파수 대역의 것인지를 조사하는 스텝(L3S2)을 수행하며, 상기 스텝(L3S2)에서 밴드 패스 필터부(300)의 주파수가 가장 높은 주파수 대역이 아니면 높은 주파수 대역으로 스위칭부(200)를 절환시키는 스텝(L3S3)을 수행하고, 상기, 스텝(L3S2)에서 밴드 패스 필터부(200)의 주파수가 가장 높은 주파수 대역이라 판단되면 다시 상기 밴드 패스 필터부(200) 및 램(RAM)으로 부터의 신호(S9),(S10)의 차를 포커스 구동모터가 움직 인 다음의 상태의 값(△)과 비교하는 스텝(L3S4)을 수행하며, 상기 스텝(L3S4)수행후, 포커스 구동모터 가 움직인 다음의 상태의 값(△)이 작으면 비데오 카메라가 움직여 포커스가 변화된 것이므로 스위칭부의 절환 제어신호(S13)를 로직 “로우”인 제로로 초기화하는 스텝(L3S5)을 수행하도록, 이루어지는 비데오 카메라의 오토 포커싱방법.4. The focus state irradiation routine (L3) according to claim 3, wherein the focus state irradiation routine (L3) performs the step (L3S1) of temporarily stopping the focus drive motor with the auto focusing control signals (C1) and (C2) as zero, and the step (L3S1). After performing, step (L3S2) of checking whether the frequency of the band pass filter unit 300 is the highest frequency band is performed, and in step L3S2, the frequency of the band pass filter unit 300 has the highest frequency. If it is not a band, the step L3S3 of switching the switching unit 200 to a high frequency band is performed, and if it is determined in step L3S2 that the frequency of the band pass filter unit 200 is the highest frequency band, the band is again. Performing a step (L3S4) of comparing the difference between the signals S9 and S10 from the pass filter unit 200 and the RAM with the value? Of the state after the focus driving motor is moved; After performing the step L3S4, the value of the state after the focus drive motor is moved If (△) is small, the video camera is moved and the focus is changed, so that the step L3S5 of initializing the switching control signal S13 of the switching unit to a logic "low" zero is performed. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910013121A 1991-07-30 1991-07-30 Circuit & method for auto-focusing of video camera KR0130002B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019910013121A KR0130002B1 (en) 1991-07-30 1991-07-30 Circuit & method for auto-focusing of video camera
GB9216179A GB2258966A (en) 1991-07-30 1992-07-30 Auto-focusing circuit
JP4203837A JPH05199445A (en) 1991-07-30 1992-07-30 Automatic focusing circuit of video camera and method thereof

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Application Number Priority Date Filing Date Title
KR1019910013121A KR0130002B1 (en) 1991-07-30 1991-07-30 Circuit & method for auto-focusing of video camera

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KR930003686A true KR930003686A (en) 1993-02-24
KR0130002B1 KR0130002B1 (en) 1998-04-11

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JPH02217075A (en) * 1989-02-17 1990-08-29 Sony Corp Automatic focusing circuit
JP2837170B2 (en) * 1989-03-06 1998-12-14 シャープ株式会社 Auto focus device
JPH0348806A (en) * 1989-07-18 1991-03-01 Konica Corp Automatic focusing device
JPH0396178A (en) * 1989-09-08 1991-04-22 Sanyo Electric Co Ltd Automatic focus device
JPH03285467A (en) * 1990-03-30 1991-12-16 Sharp Corp Automatic focusing device
JP3041969B2 (en) * 1990-12-27 2000-05-15 ソニー株式会社 Video camera

Also Published As

Publication number Publication date
KR0130002B1 (en) 1998-04-11
JPH05199445A (en) 1993-08-06
GB2258966A (en) 1993-02-24
GB9216179D0 (en) 1992-09-09

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