CN1127366A - Exposure adjusting device of pickup camera - Google Patents
Exposure adjusting device of pickup camera Download PDFInfo
- Publication number
- CN1127366A CN1127366A CN95109160A CN95109160A CN1127366A CN 1127366 A CN1127366 A CN 1127366A CN 95109160 A CN95109160 A CN 95109160A CN 95109160 A CN95109160 A CN 95109160A CN 1127366 A CN1127366 A CN 1127366A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- signal
- window
- exposure
- video camera
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Images
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
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
Abstract
The invention relates to an exposal regulating device used for a camera. The device adopts an image signal brought to shooting components by an aperture of the camera to regulate the exposal corresponding to shooting sites. A position specifying part specifies a position of an object to be shot relevant to the shooting site; A display device displays the shooting site brought by the shooting components and designed windows in the shooting site, If an exposal control part generates exposal control signals according to a pre-set weighted value to lead the shooting site in the designed window to be different from the shooting site out of the window on the significance, a driving device drives the aperture to reduce or enlarge the aperture according to the exposal control signals.
Description
The present invention relates to a kind of video camera, particularly relate to the sort of brightness size, can both project the video camera exposure adjusting device of the scalable exposure on the fixing imaging apparatus regardless of the object of wanting to take.
In the prior art, video camera has the automatic exposure regulatory function, regulates aperture so that no matter want the brightness of the object taken, constant luminous flux is projected on the imaging apparatus.According to Fig. 1 general automatic exposure regulating device is described below.
Fig. 1 is the block scheme of the video camera of the general band exposure adjusting device of expression.
In Fig. 1, project on the imaging apparatus of forming by charge-coupled device (CCD) etc. 13 by object lens 11 and aperture 12 facing to the optical image signal of captured scene.Imaging apparatus 13 carries out light-to-current inversion to the optical image signal that is projected and produces electric picture signal.The noise component that is included in the electrical picture signal that is applied by imaging apparatus 13 is eliminated by squelch portion 14.The picture signal of having eliminated noise component imposes on exposure adjusting portion 16 and signal processing part 15 respectively.By signal processing part 15 picture signal is offered viewfinder 17 etc.
On the other hand, exposure adjusting portion 16 is provided with monochrome information extraction apparatus 161 and exposure value resolver 162, produces to be used to control the signal that aperture opens and closes.Monochrome information extraction apparatus 161 detects the average value information with respect to the monochrome information of the scene of the picture signal of having been eliminated the device noise by squelch portion 14.Exposure value resolver 162 compares detected average value information with reference value, if average value information just produces the control signal that is used for stop down greater than reference value, if just produce the control signal that is used to enlarge aperture less than reference value.By according to from the control signal of exposure value resolver 162 output and drive electric motor 18 enlarges or stop down 12, project the luminous flux of imaging apparatus 13 with adjusting.As a result, the device of Fig. 1 is automatically regulated the mean value that is mapped to the luminous flux on the imaging apparatus 13 and is made it always to remain and equal reference value.
Fig. 2 A to Fig. 2 C represents to be used for the window that extracts at the exposure information that existing exposure regulating method uses.
In Fig. 2 A to Fig. 2 C, maximum square square frame is equivalent to a frame.Have as the method for existing exposure adjusting device extraction with respect to the luminous flux information of want photographed scene: (1) uses the method (Fig. 2 A) of the average brightness of whole image; (2) monochrome information of shooting picture central part is averaged and the method (Fig. 2 B) of the adjusting that is used to expose; (3) picture is divided into a plurality of zones, and distinguishes, particularly make corresponding to the weighted value of picture central portion greatly, extract method (Fig. 2 C) of monochrome information etc. with this according to each regional significance level.
By the represented prior art of Fig. 2 A (1), the object in the scene that will take was compared with background luminance under the dark situation, just can not carry out regulating by the correct exposure of aperture 12.The prior art (3) of the prior art of Fig. 2 B (2) and Fig. 2 C can be carried out correct exposure and regulates though be positioned at object under the situation at photographed scene center, just can not carry out correct exposure if object is positioned at the outline portion of photographed scene.
Therefore, in order to solve the existing defective of above-mentioned existing method, the exposure adjusting device that the purpose of this invention is to provide a kind of video camera, by specify the position of the object in the photographed scene by the cameraman, no matter object is in where going up in the photographed scene, can both be that correct exposure adjusting is carried out at the center with the object as target.
In order to realize above-mentioned purpose of the present invention,, comprising: aperture using the picture signal that applies through imaging apparatus to regulate in the device corresponding to the exposure of photographed scene; The position specified device produces the position specification signal that is used to specify facing to the object position that will take of photographed scene; Be used for showing photographed scene and the device that is set in the window of photographed scene according to the position specification signal that is applied by the position specified device; The exposure control part produces exposure control signal so that the significance level of the photographed scene in the above-mentioned window and window photographed scene outward difference to some extent according to the position specification signal that is applied by the position specified device and according to predefined weighted value; Be used for driving the device of aperture according to the exposure control signal of exposure control part.
Fig. 1 is the block scheme of the general video camera with exposure adjusting device of expression;
Fig. 2 A-Fig. 2 C represents to be used for the window that the employed exposure information of existing exposure regulating method extracts respectively.
Fig. 3 is the block scheme of the video camera exposure adjusting device of the expression preferred embodiment of the present invention;
Fig. 4 A-Fig. 4 C is the diagrammatic sketch of representing respectively by the specified window of cameraman;
Fig. 5 A-Fig. 5 D is the diagrammatic sketch that is illustrated in the situation of under the various environment object being taken.
Describe in detail with reference to the accompanying drawings below and realize embodiments of the invention.
Fig. 3 is the block scheme of the exposure adjusting device of the video camera in the expression preferred embodiment of the present invention.
The device of Fig. 3 according to one embodiment of present invention comprises: have object lens 11, aperture 12, imaging apparatus 13, squelch portion 14, signal processing part 15 and motor 18 with existing Fig. 1 device identical function.The electrical picture signal of being exported from squelch portion 14 imposes on exposure adjusting portion 24 of the present invention.The output signal of signal processing part 15 imposes on finder 22.In order to specify shown position of window in finder 22, position specifying part 21 produces position specification signal PSEL1/PSEL2.This position specifying part 21 can realize using original direction setting key to come the input position specification signal.Use primary importance specification signal PSEL1 to specify the position of window that is presented in the finder 22 temporarily.Thereby, depressing the position that is built in the position specifying part 21 when determining switch 211, in order to show the situation of determining the window's position by finder 22, produce second place specification signal PSEL2.Corresponding position specification signal PSEL1/PSEL2 offers exposure adjusting portion 24 and position information generator 23 respectively.The monochrome information extraction apparatus 241 of exposure adjusting portion 24 extracts frame monochrome information (FBD), and this FBD is corresponding to the window of being determined the position by second place specification signal PSEL2.Frame monochrome information FBD produces for a scene, particularly according to producing frame monochrome information FBD being processed into different picture signals inside and outside the window.
Exposure value resolver 242 is provided the driving of frame monochrome information FBD with control motor 18.
On the other hand, position information generator 23 produces window signal WIN1/WIN2 and offers viewfinder 22 according to the signal PSEL1/PSEL2 that is provided by position specifying part 21.Wherein, the first window signal WIN1 is the signal that is used on the picture of viewfinder 22 showing the window of dotted line or light line, and the second window signal WIN2 is the signal that is used to show the window of solid line or distinct solid line.Viewfinder 22 stacks up a picture signal schoolmate mouthful signal WIN1/WIN2 and is presented on the picture.
Fig. 4 A-Fig. 4 C represents the window by the specified position of cameraman.Shown in Fig. 4 A-Fig. 4 C, Fig. 3 device of the present invention, by the operation of cameraman's position specifying part 21, according to the primary importance specification signal PSEL1 that is produced by position specifying part 21 make window on the picture of viewfinder 22 about, move up and down with on the diagonal.
When the shooting of using Fig. 3 device began, position information generator 23 produced the first window signal WIN1 of the screen displayed window that is used on viewfinder 22 according to the window initial position specification signal that stores.Then, the driving of exposure adjusting portion 24 control motor 18 is so that aperture 12 has the stretching degree of having set.Viewfinder 22 is superimposed with the first window signal WIN1 that produces according to the initial position specification signal, and demonstrates the window of being represented by dotted line or light line (Fig. 4 A) at the middle body of picture.And viewfinder 22 demonstrates the picture signal of being carried out light-to-current inversion by object lens 11 by imaging apparatus 13.
The cameraman observes shooting scene and the window that is presented on viewfinder 22 pictures on one side, on one side operating position specifying part 21 so that the window that is illustrated by the broken lines is moved towards the object direction in the shooting scene.The window that the operation handlebar of the position specifying part 21 by the cameraman is presented in viewfinder 22 pictures moves on the position of Fig. 4 B or Fig. 4 C.
If the primary importance specification signal PSEL1 that position specifying part 21 produces corresponding to cameraman's key operation, and offering position information generator 23, position information generator 23 is just judged: the position specification signal that is provided by position specifying part 21 is primary importance specification signal PSEL1 or second place specification signal PSEL2.Through judging, if the position specification signal that is added on the position information generator 23 is primary importance specification signal PSEL1, position information generator 23 just produces the first window signal WIN1, is used at display window according to primary importance specification signal PSEL1 and on definite position.Its result, viewfinder 22 shows the window that is illustrated by the broken lines on by the position in viewfinder 22 pictures of cameraman's appointment.If the window that is presented in viewfinder 22 pictures is moved on the desirable position of cameraman by this process, promptly want on the position of the object of making a video recording, the cameraman determines switch 211 with regard to operating position so that position specifying part 21 output second place specification signal PSEL2.The 2nd position specification signal PSEL2 that is produced by cameraman's operation is provided for exposure adjusting portion 24 and positional information generating unit 23.When positional information is sent out device 23 and is applied in second place specification signal PSEL2, produce the second window signal WIN2, and offer viewfinder 22.Viewfinder 22 demonstrates the window of being represented by solid line or distinct solid line (rather than dotted line) on picture according to the second window signal WIN2.The cameraman carries out the present position by viewfinder 22 according to the solid line window that shows and specifies the exposure adjusting that just can realize using this window.
On the other hand, if second place specification signal PSEL2 is imposed on exposure adjusting portion 24, the monochrome information extraction unit 241 of exposure adjusting portion 24 uses the window that is presented on the present viewfinder 22 to carry out distinguishing corresponding to the zone of the scene image signal that is applied by imaging apparatus 13 and squelch portion 14 with identical window.In case the zone by window is distinguished and is done, monochrome information extraction apparatus 241 just corresponds respectively to monochrome information inside and outside the window from the picture signal detection corresponding to a scene.Then, thus monochrome information extraction apparatus 241 just averages the monochrome information corresponding to the pixel that is positioned at window and produces first mean value; Produce second mean value corresponding to the monochrome information that is positioned at the outer pixel of window averages.If calculate first mean value and second mean value, monochrome information extraction apparatus 241 is just calculated first mean value and second mean value with different big or small weights respectively.
At this moment, weighted value is redefined for: the weighted value that same first mean value multiplies each other is greater than the weighted value that multiplies each other with second mean value.Monochrome information extraction apparatus 241 averages the mean value that multiplies each other with weighted value respectively once more and produces the frame monochrome information FBD of a corresponding scene.By exposure value resolver 242 frame monochrome information FBD is compared with predefined reference value.If FBD is greater than reference value for the frame monochrome information, exposure value resolver 242 produces and is used for the first exposure control signal CTL1 of stop down 12 and offers motor 18.Determine the stretching degree of aperture 12 by the motor 18 that is provided this exposure control signal CTL1/CTL2, just can carry out automatic exposure thus and regulate.
Fig. 5 A-Fig. 5 D is illustrated in the situation of under the various environment object being made a video recording.Fig. 5 A and 5B represent that respectively object is positioned at the situation at photographed scene center, and Fig. 5 C and Fig. 5 D represent the situation in object deflection photographed scene left side.In addition, Fig. 5 A and 5C represent the dark and bright situation of object of background, and Fig. 5 B and 5D represent that background is bright and situation that object is dark.
Above-mentioned Fig. 5 A to Fig. 5 D compares the same prior art of the present invention (Fig. 2 A to Fig. 2 C) and illustrates below by contrast.
Under the situation of Fig. 5 A and 5B, though there is the problem of over-exposed (situation of Fig. 5 A) and under-exposed (situation of Fig. 5 B) that cause because of bright excessively object in above-mentioned prior art (1), prior art (2) and (3) and the present invention can both carry out correct exposure.Yet under the situation of Fig. 5 C, all there are over-exposed problem in prior art (1), (2) and (3), the adjusting and the present invention can expose normally.And under the situation of Fig. 5 D, there are under-exposed defective in prior art (1), (2) and (3), and the present invention's adjusting that can expose normally.
In the embodiment of the invention described above,, also can be the embodiment that weighted value is multiplied each other with each pixel though be that weighted value be multiply by mean value to the average luminance information that calculates respectively inside and outside the window.
As described above, realize video camera of the present invention, take the field even object is in Optional position in the scape, by centered by object, regulating depth of exposure, just can be to clapping Take the photograph scene and carry out correct exposure adjusting.
Claims (7)
1. the exposure adjusting device of a video camera, the picture signal of using the imaging apparatus by video camera to apply is regulated the exposure of corresponding photographed scene, it is characterized in that, comprising:
Aperture;
The position specified device, generation is used to specify the position specification signal corresponding to the position of the object that will take of photographed scene;
Be used for showing photographed scene and the position of window that is set in photographed scene according to the position specification signal that is applied by above-mentioned position specified device;
The exposure control part according to the position specification signal that is applied by above-mentioned position specified device, and produces exposure control signal according in advance the photographed scene in the above-mentioned window and window photographed scene outward being set at different weighted values;
Be used for driving the device of aperture according to the exposure control signal of above-mentioned exposure control part.
2. video camera exposure adjusting device according to claim 1 is characterized in that, above-mentioned position specified device comprises that the position that the exposure that is used to indicate the window that uses specified position is regulated determines switch;
Generation produces second place specification signal in response to the primary importance specification signal of the window's position move operation of cameraman when depressing when switch is determined in above-mentioned position.
3. video camera exposure adjusting device according to claim 2 is characterized in that, above-mentioned display device comprises:
Be used to show the viewfinder of above-mentioned photographed scene and window signal;
Generation is used for showing to have according to first shows signal of the window of the specified position of above-mentioned primary importance specification signal and be used for using at the shown window of above-mentioned viewfinder and show that exposure regulates the position information generator of second shows signal of implementation status at above-mentioned viewfinder.
4. video camera exposure adjusting device according to claim 3 is characterized in that, above-mentioned first shows signal and second shows signal are the signals that is used for having in the screen displayed of viewfinder the window of mutual difference shape.
5. video camera exposure adjusting device according to claim 4 is characterized in that, above-mentioned exposure control part comprises:
The monochrome information extraction apparatus, superimposed from the picture signal of above-mentioned imaging apparatus together primary importance specification signal and second place specification signal from above-mentioned position specified device, calculate frame luminance information signal corresponding to photographed scene;
The exposure value resolver produces exposure control signal comparing with predefined reference value from the luminance information signal that above-mentioned elevation information extraction apparatus applied.
6. video camera exposure adjusting device according to claim 5 is characterized in that, above-mentioned monochrome information extraction apparatus is carried out the following step:
In photographed scene, set window according to the position specification signal that is applied by above-mentioned position specified device;
Calculating is corresponding to first monochrome information of the window interior of above-mentioned setting with corresponding to second monochrome information of window outside;
Produce the frame luminance information signal according to above-mentioned monochrome information.
7. video camera exposure adjusting device according to claim 6 is characterized in that, if above-mentioned frame luminance information signal less than the said reference value, above-mentioned exposure value resolver just produces the exposure control signal that is used to enlarge said aperture; If above-mentioned frame luminance information signal is greater than the said reference value, above-mentioned exposure value resolver just produces and is used to dwindle the exposure control signal of said aperture.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940016616A KR0185909B1 (en) | 1994-07-11 | 1994-07-11 | Exposure control apparatus for video camera |
| KR16616/94 | 1994-07-11 | ||
| KR16616/1994 | 1994-07-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1127366A true CN1127366A (en) | 1996-07-24 |
| CN1075313C CN1075313C (en) | 2001-11-21 |
Family
ID=19387713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95109160A Expired - Fee Related CN1075313C (en) | 1994-07-11 | 1995-07-10 | Exposure adjusting device of pickup camera |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0856305A (en) |
| KR (1) | KR0185909B1 (en) |
| CN (1) | CN1075313C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391237C (en) * | 2003-10-15 | 2008-05-28 | 富士通天株式会社 | Image processing device, operation supporting device, and operation supporting system |
| CN101651775B (en) * | 2008-08-14 | 2011-08-24 | 鸿富锦精密工业（深圳）有限公司 | Image capture device and exposure method thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100861208B1 (en) * | 2001-12-24 | 2008-09-30 | 매그나칩 반도체 유한회사 | Method for luminance correcting in multi-mode |
| KR100433092B1 (en) * | 2002-06-20 | 2004-05-28 | 주식회사 하이닉스반도체 | Method for controlling exposure of digital camera |
| KR20040033967A (en) * | 2002-10-16 | 2004-04-28 | 삼성테크윈 주식회사 | Method for controlling digital camera wherein location of indicating detection area varies |
| KR101230200B1 (en) * | 2005-03-29 | 2013-02-05 | 코니카 미놀타 포토 이미징 가부시끼가이샤 | Imaging device |
| KR101984516B1 (en) | 2017-07-21 | 2019-05-31 | 엘지전자 주식회사 | Cleaner and controlling method thereof |
| WO2021159279A1 (en) * | 2020-02-11 | 2021-08-19 | 深圳元戎启行科技有限公司 | Exposure control method and apparatus, and readable storage medium and computer device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2898987B2 (en) * | 1988-03-18 | 1999-06-02 | キヤノン株式会社 | Exposure control device |
| JPH03187580A (en) * | 1989-12-15 | 1991-08-15 | Kyocera Corp | Camera whose af and ae areas can be set optionally |
-
1994
- 1994-07-11 KR KR1019940016616A patent/KR0185909B1/en not_active IP Right Cessation
-
1995
- 1995-07-07 JP JP7172350A patent/JPH0856305A/en active Pending
- 1995-07-10 CN CN95109160A patent/CN1075313C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391237C (en) * | 2003-10-15 | 2008-05-28 | 富士通天株式会社 | Image processing device, operation supporting device, and operation supporting system |
| CN101651775B (en) * | 2008-08-14 | 2011-08-24 | 鸿富锦精密工业（深圳）有限公司 | Image capture device and exposure method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0856305A (en) | 1996-02-27 |
| KR960006506A (en) | 1996-02-23 |
| KR0185909B1 (en) | 1999-05-01 |
| CN1075313C (en) | 2001-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5745175A (en) | Method and system for providing automatic focus control for a still digital camera | |
| CN1212004C (en) | Image processing device and method | |
| JP4115467B2 (en) | Imaging device | |
| KR101411910B1 (en) | Digital photographing apparatus and method for controlling the same | |
| CN1926851A (en) | Method and apparatus for optimizing capture device settings through depth information | |
| US5838370A (en) | Image pickup apparatus | |
| CN106161979B (en) | High dynamic range images image pickup method, device and terminal device | |
| JPH03204281A (en) | Image pickup device | |
| US6552748B1 (en) | Camera which automatically and properly focuses in situations with relatively low luminance foreground objects and high luminance background objects | |
| EP0987884B1 (en) | Automatic focusing device | |
| CN1075313C (en) | Exposure adjusting device of pickup camera | |
| JPH11215426A (en) | Automatic focusing system | |
| US20020012063A1 (en) | Apparatus for automatically detecting focus and camera equipped with automatic focus detecting apparatus | |
| JP3180486B2 (en) | Automatic focusing device and video camera | |
| JPH08205021A (en) | Image input device | |
| JP4553570B2 (en) | Auto focus camera | |
| CN114928728A (en) | Projection apparatus and foreign matter detection method | |
| CN111866399B (en) | Image processing apparatus, control method thereof, and computer readable medium | |
| JP4586578B2 (en) | Digital camera and program | |
| JP3477936B2 (en) | Automatic exposure control device | |
| JP2004173251A (en) | Camera | |
| JPH05297433A (en) | Control method for camera | |
| JP2935048B2 (en) | Automatic exposure control device | |
| JP3028830B2 (en) | Video camera equipment | |
| JPH11205658A (en) | Image pickup device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20011121 |