WO2005120082A1 - カメラ装置 - Google Patents
カメラ装置 Download PDFInfo
- Publication number
- WO2005120082A1 WO2005120082A1 PCT/JP2005/010150 JP2005010150W WO2005120082A1 WO 2005120082 A1 WO2005120082 A1 WO 2005120082A1 JP 2005010150 W JP2005010150 W JP 2005010150W WO 2005120082 A1 WO2005120082 A1 WO 2005120082A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- video signal
- peak value
- white balance
- camera device
- balance control
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control
Definitions
- the present invention relates to a camera device, and more particularly to a camera device that can control white balance while preventing an image from gradually becoming monochrome.
- An image captured by a television camera device has a bluish tint when using illumination light having a high color temperature, and a red tint when using illumination light having a low color temperature. Therefore, it is necessary to adjust the white balance of the camera device according to the change in the color temperature of the illumination light.
- the conventional camera device automatically controls the white lance unconditionally based on the video signal of the entire field, the conventional camera device determines the white based on the peak value of the video that is not white. It is unavoidable that the balance is controlled and the video gradually becomes monochrome.
- the present invention has been made to solve the conventional problem, and has as its object to provide a camera device capable of controlling a white balance while preventing a video from becoming monochrome gradually.
- a camera device provides an optical image forming unit that forms an optical image of a subject, and converts the optical image into an R video signal, a G video signal, and a B video signal (hereinafter, referred to as an RGB video signal). Converting means for adjusting the gain of the RGB video signal; A camera device comprising: white balance control means for controlling white balance of the adjusted RGB video signal; and video signal output means for outputting the RGB video signal after white balance control,
- An inspection RGB video signal extraction unit for extracting the RGB video signal in which the RGB video signal power after gain adjustment is also included in a predetermined detection area;
- a peak value detection unit that detects a certain R peak value, G peak value, and B peak value;
- a B level controller that controls the level of the B video signal after gain adjustment based on the difference between the B peak value and the G peak value.
- the white balance control means may include an integrated average of the R peak value, the G peak value, and the B peak value (hereinafter referred to as RGB peak value) for a first predetermined period. It has a configuration to detect the value as an RGB peak value.
- the white balance control means may include an absolute value of a deviation between the G peak value and the R peak value, and an absolute value of a deviation between the G peak value and the B peak value. When either one of them is larger than a predetermined threshold, the white balance control is stopped.
- the white balance control means determines that a predetermined condition is satisfied.
- V have a configuration to stop the white balance control if you! /
- the camera device is configured such that the white balance control means stops the white balance control when the gain of the gain adjustment means is equal to or higher than a predetermined gain. According to this configuration, it is possible to prevent the white balance from being controlled incorrectly.
- the white balance control means includes at least one of a level control of the R video signal by the R level control unit and a level control of the B video signal by the B level control unit. After the execution of the control, the restart of the white balance control is prohibited for the second predetermined period.
- the present invention provides a camera device having an effect that, by providing a white balance control means, it is possible to automatically adjust the white balance while preventing a video from gradually becoming monochrome, and to provide an effect. You can do it.
- FIG. 1 is a block diagram of a camera device according to the present invention.
- FIG. 2 is a hardware block diagram of the camera device of the present invention.
- FIG. 3 is a flowchart of a first main routine for explaining an operation of the camera device according to the first embodiment of the present invention.
- FIG. 4 is a graph of a video signal of the camera device according to the first embodiment of the present invention.
- FIG. 5 is a flowchart of an R level control routine for explaining the operation of the camera device according to the first embodiment of the present invention.
- FIG. 6 is a flowchart of a B-level control for explaining the operation of the camera device according to the first embodiment of the present invention.
- FIG. 7 is a flowchart of a second main routine for explaining the operation of the camera device according to the second embodiment of the present invention.
- FIG. 8 is a flowchart of a third main routine for explaining the operation of the camera device according to the third embodiment of the present invention.
- FIG. 9 is a flowchart of a fourth main routine for explaining the operation of the camera device according to the fourth embodiment of the present invention.
- FIG. 10 is a flowchart of a fifth main routine for explaining the operation of the camera device according to the fifth embodiment of the present invention.
- FIG. 11 is a flowchart of a sixth main routine for explaining the operation of the camera device according to the sixth embodiment of the present invention.
- a camera device 1 includes: an optical image forming unit 11 that forms an optical image of a subject; a converting unit 12 that converts an optical image into an RGB video signal; Gain adjustment means 13 for adjusting the gain of the RGB video signal, white balance control means 14 for controlling the white balance of the RGB video signal after the gain adjustment, and the video signal for outputting the RGB video signal after the white balance control Output means 15.
- FIG. 2 is a hardware block diagram of the camera device 1 according to the present invention.
- the optical image forming unit 11 captures a subject image into the camera device 1 and captures the subject image into the camera device 1.
- the aperture 112 that continuously adjusts the amount of light that is emitted, the CC filter 113 that adjusts the light component that enters the camera device 1 according to the color temperature of the illumination, and the amount of light that enters the camera device 1 according to the brightness of the subject
- an ND filter 114 that adjusts step by step.
- the conversion means 12 is composed of a dichroic prism 121 for decomposing incident light into RGB light beams, and a CCD 122 for R, a CCD 123 for G, and a CCD 124 for B for converting the respective intensities of the RGB light into video signals. .
- the gain adjustment means 13 amplifies the outputs of the CCD 122 for R, the CCD 123 for G, and the CCD 124 for B, respectively.
- the R preamplifier 131, the G preamplifier 132, the B preamplifier 133, and the amplified RGB video It comprises a gain adjuster 134 for R, a gain adjuster 135 for G, and a gain adjuster 136 for B for adjusting the signal gain.
- the white balance control means 14 reads the RGB video signal after the gain adjustment and outputs a RB level control signal, a microprocessor 2, an AZD converter 3 for digitally converting the RGB video signal, and an R level control.
- An R multiplier 141 for multiplying the signal and the R video signal after gain adjustment, and a B multiplier 142 for multiplying the B level control signal and the B video signal after gain adjustment are provided. That is, the microprocessor 2, the AZD translator 3, and the multiplier 141 for R function as an R video signal level control unit, and the microprocessor 2, the AZD translator 3, and the multiplier 142 for B Functions as a signal level control unit.
- the actual camera device 1 further includes an aperture control unit 143 that controls the aperture 112 based on a signal output from the microprocessor 2, and a V and CC filter based on the signal output from the microprocessor 2. And a filter control unit 144 for switching between the ND filter 113 and the ND filter 114.
- the microprocessor 2 includes a CPU 21 for executing a program, a memory 22 for storing a program to be executed by the CPU 21, a video storage buffer 23 for storing an RGB video signal digitized by the AZD converter 3, and a CPU 21.
- the DZA conversion that converts the RB level adjustment signal calculated in step 2 into an analog signal, and the external interface (IZF) 25 that reads specific conditions or forced white balance commands of the camera device 1 are connected in common. 26.
- the CPU 21 outputs the level-controlled R video signal output from the R multiplier 141, the gain-adjusted G video signal output from the G gain adjuster 135, and After the level control output from the application multiplier 142 ⁇ Read the video signal into the video storage buffer 23 (step S31).
- the CPU 21 executes a process of extracting a detected RGB video signal (step S32).
- This process is for extracting an RGB video signal in an area suitable for controlling white balance from the RGB video signal of one entire field, and is an external interface.
- a range of 25%, 50%, 90% from the center of the screen can be specified as the detection range
- the CPU 21 detects the peak values P and P of the detected RGB video signal (
- FIG. 4 is a waveform diagram of a one-field RGB video signal in a case where a range of 50% from the center of the screen is designated as a detection range. Each peak of the RGB video signal included in the detection range is detected as a peak value, P, and P.
- the CPU 21 calculates the difference between the R peak value P and the G peak value P, ie, the RG peak difference ⁇ and
- the BG peak difference ⁇ which is the difference between the ⁇ peak value ⁇ and the G peak value ⁇ , is calculated (step S34).
- the CPU 21 determines that the absolute value of the RG peak difference ⁇ is equal to or less than a predetermined threshold ⁇ .
- step S35 Is determined (step S35), and if it is greater than threshold ⁇ , R level control is executed (step S35).
- Step S36 the process returns to step S31.
- step S38 the ⁇ level control is executed (step S38), and the process of step S31 is performed.
- the CPU 21 calculates the R level control signal ⁇ ⁇ ⁇ as a function of the RG peak difference ⁇ (step S36).
- the R multiplier 141 multiplies the R level control B by the R video signal after the gain adjustment, and
- the CPU 21 calculates the ⁇ level control signal ⁇ ⁇ ⁇ as a function of the BG peak difference ⁇ (step S38).
- ⁇ level control signal ⁇ is output (step S382), and this routine ends.
- the multiplier for B 142 multiplies the B level control B by the B video signal after the gain adjustment, and
- the R level control signal B and the R level control signal B are controlled by inserting a low-pass filter at the output side of the A / A converter 24. It is desirable to suppress a rapid change of the B level control signal B.
- white balance can be controlled using an appropriate portion of a video.
- the white balance control speed is set according to the situation.
- FIG. 7 is a flowchart of a second main routine for enabling the control speed of the white balance to be changed, and includes steps S41 to S43 between steps S33 and S34 of the first main routine. Is added.
- Step S33 After detecting the peak value of the detected RGB video signal (Step S33), the CPU 21 integrates the peak value (Step S41).
- the CPU 21 determines whether or not video signals for a predetermined number of fields (for example, 16 frames) have been read (step S42). If the reading has not been completed, the process returns to step S31. To continue reading the video signal.
- a predetermined number of fields for example, 16 frames
- the CPU 21 averages the peak values by dividing the integrated value of the peak values by the predetermined number of fields (step S43).
- the white balance control speed can be reduced by setting the predetermined number of fields to be large, and the white balance control speed can be increased by setting the predetermined number of fields to be small. Operations other than those described above are the same as those in the first embodiment, and a description thereof will not be repeated.
- the control speed of the white balance is changed by setting the peak value to the integrated average of the peak values of a plurality of fields. To be able to and.
- the white balance is constantly controlled based on the peak value of the inspection video signal, the video may gradually become monochrome. Therefore, in the camera device according to the present invention, the white balance is controlled only when an image that can be regarded as white is taken.
- FIG. 8 is a flowchart of a third main routine for determining whether or not the inspection video signal can be regarded as that of a white video before white balance control. Steps S44 and S45 are added between steps S33 and S34 of the routine.
- step S33 After detecting the RGB peak value (step S33), the CPU 21 outputs the peak value P of the R video signal.
- the absolute value of the difference between the peak value P of the R video signal and the peak value P of the G video signal is equal to or less than the threshold j8.
- the CPU 21 ends the routine without controlling the white balance assuming that the image is colored.
- the CPU 21 calculates the difference between the peak value P of the B video signal and the peak value P of the G video signal.
- step S45 It is determined whether or not the absolute value is smaller than a predetermined threshold 13 (step S45).
- the absolute value of the difference between the peak value P of the B video signal and the peak value P of the G video signal is equal to or less than the threshold j8.
- the CPU 21 determines that the image is colored and ends this routine.
- the image can be regarded as white, and the peak value difference
- step S34 The calculation (step S34) is executed.
- the white balance control can be forcibly stopped.
- FIG. 9 is a flowchart of the fourth main routine.
- a step is performed before step S31 of the first main routine.
- S46 and step S47 are added.
- the CPU 21 first reads specific conditions via the external interface 25 (step S46), and determines whether or not the force satisfies the specific conditions (step S47).
- the CPU 21 ends the routine without executing the white balance control when the specific condition is satisfied, and executes the white balance control when the specific condition is not satisfied (step S31 and subsequent steps).
- the white balance can be forcibly stopped when the specific condition is satisfied.
- the gains of the R gain adjuster 134, the G gain adjuster 135 and the B gain adjuster 136 are white when the gain G is high.
- Step S48 is added before step S31 of the first main routine so that the balance is not controlled.
- the CPU 21 determines whether the gain G of the gain adjuster 134 for R, the gain adjuster 135 for G, and the gain adjuster 136 for B is equal to or less than a predetermined upper limit gain G (for example, 24 dB).
- the gains of R gain adjuster 134, G gain adjuster 135, and B gain adjuster 136 are high. In some cases, by stopping the white balance control, it is possible to prevent erroneous white balance from being controlled.
- FIG. 11 is a flowchart of a sixth main routine for prohibiting the restart of the white balance control for a predetermined time. Step S49 is added after steps S36 and S38 of the first main routine.
- step S36 After executing the R level control (step S36) or executing the B level control (step S38), the CPU 21 waits for a predetermined time (for example, a time corresponding to several fields) (step S49) Then, the process returns to step S31.
- a predetermined time for example, a time corresponding to several fields
- the restart of the white balance control is prohibited for a predetermined period of time. Hunting can be prevented.
- the force for constantly feedback controlling the white balance based on the autonomous condition determination can manually and forcibly control the white balance as needed. You can do it.
- the gain adjuster 134 for R the gain adjuster 135 for G, and the gain adjuster 136 for B, the multiplier 141 for R, and the multiplier 142 for B
- the video signal output means 15 is constituted by an analog circuit, it is apparent that the present invention can be applied to a camera device for digitally processing a video signal.
- the camera device according to the present invention has an effect when the white balance can be controlled while preventing the video from gradually becoming monochrome, and is effective as an automatic imaging device or the like. is there.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Image Signal Generators (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/569,768 US20080278600A1 (en) | 2004-06-03 | 2005-06-02 | Camera Apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-165990 | 2004-06-03 | ||
JP2004165990A JP2005348141A (ja) | 2004-06-03 | 2004-06-03 | カメラ装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005120082A1 true WO2005120082A1 (ja) | 2005-12-15 |
Family
ID=35463209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/010150 WO2005120082A1 (ja) | 2004-06-03 | 2005-06-02 | カメラ装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080278600A1 (ja) |
JP (1) | JP2005348141A (ja) |
WO (1) | WO2005120082A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013150167A (ja) * | 2012-01-19 | 2013-08-01 | Sony Corp | 撮像装置、色補正方法、および色補正プログラム |
US10735704B2 (en) | 2018-02-09 | 2020-08-04 | Qualcomm Incorporated | Systems and methods for automatic white balance |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59140589U (ja) * | 1983-03-09 | 1984-09-19 | 日立電子株式会社 | テレビジヨンカメラ装置 |
JPS6135486U (ja) * | 1984-08-06 | 1986-03-04 | シャープ株式会社 | カラ−テレビカメラの制御装置 |
JPH0818996A (ja) * | 1994-07-05 | 1996-01-19 | Nec Corp | 自動ホワイトバランス回路 |
JPH11275598A (ja) * | 1998-03-20 | 1999-10-08 | Sony Corp | 撮像装置のホワイトバランス調節装置および方法 |
JP2000102030A (ja) * | 1998-09-25 | 2000-04-07 | Ricoh Co Ltd | ホワイトバランス制御装置 |
JP2000299877A (ja) * | 1992-09-11 | 2000-10-24 | Canon Inc | 撮像装置 |
JP2001119716A (ja) * | 1999-10-18 | 2001-04-27 | Hitachi Ltd | 白バランス調整装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6421083B1 (en) * | 1996-03-29 | 2002-07-16 | Sony Corporation | Color imaging device and method |
DE19712434C2 (de) * | 1997-03-25 | 1999-01-28 | Zeiss Carl Fa | Verfahren zum Abgleich eines Videosignals |
-
2004
- 2004-06-03 JP JP2004165990A patent/JP2005348141A/ja active Pending
-
2005
- 2005-06-02 WO PCT/JP2005/010150 patent/WO2005120082A1/ja active Application Filing
- 2005-06-02 US US11/569,768 patent/US20080278600A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59140589U (ja) * | 1983-03-09 | 1984-09-19 | 日立電子株式会社 | テレビジヨンカメラ装置 |
JPS6135486U (ja) * | 1984-08-06 | 1986-03-04 | シャープ株式会社 | カラ−テレビカメラの制御装置 |
JP2000299877A (ja) * | 1992-09-11 | 2000-10-24 | Canon Inc | 撮像装置 |
JPH0818996A (ja) * | 1994-07-05 | 1996-01-19 | Nec Corp | 自動ホワイトバランス回路 |
JPH11275598A (ja) * | 1998-03-20 | 1999-10-08 | Sony Corp | 撮像装置のホワイトバランス調節装置および方法 |
JP2000102030A (ja) * | 1998-09-25 | 2000-04-07 | Ricoh Co Ltd | ホワイトバランス制御装置 |
JP2001119716A (ja) * | 1999-10-18 | 2001-04-27 | Hitachi Ltd | 白バランス調整装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2005348141A (ja) | 2005-12-15 |
US20080278600A1 (en) | 2008-11-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7551209B2 (en) | Imaging apparatus and method for controlling white balance | |
US11310435B2 (en) | Image pickup apparatus having auto day-night function, control method therefor, and storage medium storing control program therefor | |
US9350905B2 (en) | Image signal processing apparatus, image signal processing method, and image capturing apparatus | |
US8466983B2 (en) | Image processing apparatus performing white balance control | |
US8009225B2 (en) | Imaging apparatus having automatic exposure control unit | |
US6690424B1 (en) | Exposure control apparatus for controlling the exposure of an image pickup plane in a camera | |
US7511740B2 (en) | Digital camera | |
JP4310317B2 (ja) | 可視成分割合算出方法、およびそれを用いた光学機器 | |
GB2499668A (en) | Exposure Controller | |
JP2009124638A (ja) | 画像信号処理回路 | |
US8320631B2 (en) | Movement detection apparatus and movement detection method | |
WO2005120082A1 (ja) | カメラ装置 | |
JP4440562B2 (ja) | 映像信号処理装置 | |
JP3138152B2 (ja) | 白バランス調整装置 | |
JP2009010694A (ja) | 露光制御回路、およびそれを搭載した撮像装置 | |
JP2807928B2 (ja) | ビデオカメラ用感度アップ回路 | |
JP4458114B2 (ja) | 撮像装置 | |
KR940007801Y1 (ko) | 자동 백 밸런스 오동작 방지 회로 | |
JP2003158671A (ja) | テレビジョンカメラ装置 | |
JPH06169427A (ja) | テレビジョンカメラのオートアイリス制御システム | |
JP2613823B2 (ja) | ホワイトバランス回路の白色検出方法 | |
JPH07250274A (ja) | オートアイリス制御回路 | |
KR19990086889A (ko) | 색 보정 회로 | |
JPH0759089B2 (ja) | 自動色温度追従装置 | |
JPH0648864B2 (ja) | ビデオカメラの平均映像レベル調整装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11569768 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |