WO2005124448A1 - カメラ - Google Patents
カメラ Download PDFInfo
- Publication number
- WO2005124448A1 WO2005124448A1 PCT/JP2005/009995 JP2005009995W WO2005124448A1 WO 2005124448 A1 WO2005124448 A1 WO 2005124448A1 JP 2005009995 W JP2005009995 W JP 2005009995W WO 2005124448 A1 WO2005124448 A1 WO 2005124448A1
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- WIPO (PCT)
- Prior art keywords
- value
- sensitivity
- exposure
- camera
- luminance
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Classifications
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- 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
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
- G03B7/091—Digital circuits
Definitions
- the present invention relates to a camera that can perform high-quality shooting in accordance with ambient brightness.
- a conventional camera can perform shooting anywhere by selecting a shooting location by performing exposure control using strobe light emission. This camera performs predetermined exposure control in consideration of the variation in exposure at the time of photographing and in order to prevent the exposure from becoming insufficient.
- FIG. 9 is a conceptual diagram of exposure control in a conventional camera. As shown in FIG. 9, when the BV value indicating the external light luminance is in the range from ⁇ 1 to 9, the EV control is controlled to increase the EV value by one step each time the BV value increases by one step. Even with such exposure control, flash (flash emission) is usually used when shooting when the BV value is 3 or less.
- Patent Document 1 As a camera for preventing underexposure even in a range where the brightness of the subject is low, a setting value with a certain brightness of the subject is used. If it is determined that the exposure is lower, the sensitivity of the built-in film is switched to a lower sensitivity, and exposure control is performed so as to increase the exposure amount.
- Patent Document 1 JP-A-5-34754
- an object of the present invention is to provide a camera that can easily perform high-quality photographing without performing flash emission.
- a camera includes a sensitivity detection unit that detects an imaging sensitivity in an imaging medium, a photometry unit that detects external light luminance, and an imaging sensitivity that is set to ISO sensitivity 1600.
- Sensitivity determining means for determining whether the sensitivity is equal to or higher than the equivalent sensitivity; and, when the sensitivity determining means determines that the imaging sensitivity is equal to or higher than the sensitivity corresponding to the ISO sensitivity of 1600, the second luminance area is determined.
- the exposure correction value is set to a value that is larger by at least 0.5 Ev on average, and the imaging sensitivity detected by the sensitivity detection unit and the detection sensitivity detected by the photometry unit are set.
- an exposure control means for calculating an exposure target value by subtracting the exposure correction value from an exposure reference value calculated based on the luminance value and performing exposure control.
- the exposure control means may determine whether the imaging sensitivity is equal to or higher than the ISO sensitivity of 1600 by the sensitivity determination means.
- the exposure correction value in the first luminance area is set to a value which is at least 0.8 EV or more on average.
- a strobe light emitting unit that emits strobe light
- a shooting mode is an automatic shooting mode
- the imaging sensitivity is equal to or higher than the ISO sensitivity 1600 by the sensitivity determination unit.
- a strobe light emission control unit for prohibiting the emission of the strobe light when the luminance value is equal to or less than a predetermined value.
- the exposure correction value is set in the first luminance area which is set on the low luminance side with respect to the second luminance area.
- FIG. 1 is a block diagram of a camera according to an embodiment of the present invention.
- FIG. 2 is a conceptual diagram of a correction control table in the camera of FIG.
- FIG. 3 is a conceptual diagram of exposure control in the camera of FIG. 1.
- FIG. 4 is a diagram showing the spectral sensitivity of a color negative.
- FIG. 5 is a view showing a relative intensity of a representative light source.
- FIG. 6 is a flowchart showing an operation of the camera of FIG. 1.
- FIG. 7 is a program diagram showing a specific example of exposure control in the camera of FIG. 1.
- FIG. 8 is a conceptual diagram of exposure control in a second embodiment.
- FIG. 9 is a conceptual diagram of exposure control in a conventional camera.
- FIG. 1 is a block diagram of a camera 10 according to the present embodiment.
- the camera 10 is applied to, for example, a lens shutter camera loaded with a 135 film format patrone.
- the camera 10 has a shutter button 11, a film sensitivity detection unit 12, a photometry unit 13, and a memory unit 14.
- a strobe light emitting section 15 A strobe light emitting section 15, a shutter section 16, a light emitting section 17, a light receiving section 18, and a control section 19.
- a control section 19 A strobe light emitting section 15, a shutter section 16, a light emitting section 17, a light receiving section 18, and a control section 19.
- the shutter button 11 is a button that is pressed when the user attempts to photograph a subject. When the shutter button 11 is pressed, the shutter section 16 opens and closes the shutter.
- the film sensitivity detection unit 12 is a sensitivity detection unit that detects the sensitivity of the film loaded in the film loading unit (not shown).
- Film sensitivity detector 12 is used for film cartridges. It reads the portion representing the sensitivity of the indicated CAS code, and outputs the read information to the control unit 19.
- the control unit 19 can recognize the film sensitivity based on the output information.
- Huinolem sensitivity This is defined by DasO (International Organization for Standardization). Note that the user may set the film sensitivity in a manual operation.
- the memory unit 14 stores a correction control table, a program diagram, and an operation program.
- the correction control table is control information that stores a BV value and an AEV value in association with each other.
- the EV value is an exposure correction value for correcting the exposure reference value.
- the exposure reference value is calculated by, for example, calculating a BV value and an SV value (Film Speed Value) in APEX units.
- the EV value (Exposure Value), which is the exposure target value, is calculated by subtracting the BV value from the SV value and the exposure correction value A EV.
- FIG. 2 is a conceptual diagram of the correction control table. As shown in FIG. 2, the BV value and the AEV value are stored in association with each other. Based on the information stored in the correction control table, a ⁇ EV value corresponding to the BV value detected by the photometer 13 is set. Then, the corrected exposure target value EV is calculated by subtracting the AEV value from the exposure reference value calculated by the BV value + SV value.
- the program diagram is control information in which an EV value expressed in APEX units for exposure control is associated with a TV value (Shutter Speed Value) and an AV value (Aperture Value) which are also APEX units. .
- the TV value indicates the shutter speed
- the AV value is information indicating the F value (lens aperture) (see FIG. 7).
- the operation program is a program for performing a series of control processes relating to a shooting operation of the camera 10.
- the strobe light emitting section 15 emits strobe light to a subject automatically or by a user operation based on the external light luminance measured by the photometry section 13.
- the strobe light emitting unit 15 can be set so that it cannot be used in a range where the BV value is predetermined (for example, BV value 3).
- the shutter unit 16 opens based on the exposure control (shutter speed and F value (lens stop)) by the control unit 19, and opens at the diameter indicated by the F value, and after a lapse of time indicated by the shutter speed.
- the shutter is closed, and the image obtained through the lens is transferred to the film while the shutter 16 is open.
- the light projecting unit 17 measures the distance to the subject, and irradiates the subject with light.
- the light receiving unit 18 calculates the distance to the subject based on the light emitted from the light projecting unit 17 and also reflecting the subject power. Specifically, the light receiving unit 18 outputs information indicating the light amount based on the received light to the control unit 21, and the control unit 19 calculates the distance to the subject based on the information indicating the input light amount. .
- the light emitting unit 17 and the light receiving unit 18 constitute a distance measuring unit.
- the control unit 19 is a control unit that controls the entire camera, and includes, for example, a CPU, a ROM, a RAM, an input signal circuit, an output signal circuit, and the like.
- the control unit 19 executes an operation flowchart described later. For example, when the press of the shutter button 11 is detected, an instruction to operate the shutter unit 16 is output. Further, it determines the film sensitivity based on the information from the film sensitivity detection unit 12. Further, a BV value is calculated based on the information indicating the light amount of the subject output from the photometry unit 13. When detecting that the shutter button 11 is half-pressed, the distance measuring unit is operated. Further, a corrected exposure target value is calculated by subtracting the exposure correction value ( ⁇ EV) from the exposure reference value.
- the control unit 19 also functions as an exposure control unit that performs exposure control.
- FIG. 3 is a conceptual diagram of the exposure control according to the first embodiment, and schematically shows the correspondence between the V and BV values stored in the correction control table and the ⁇ EV values.
- the vertical axis represents the AEV value
- the horizontal axis represents the BV value.
- the BV value is in the range of ⁇ to 3 (first luminance area)
- the ⁇ value is set to 2.
- the BV value is in the range of 6 to 9.
- the EV value is set to 1.
- the exposure target value is calculated using the obtained EV value. That is, the exposure target value is calculated by subtracting the exposure reference value (Bv + Sv) force EV value obtained by adding the SV value to the BV value. Exposure control is performed using the EV value obtained in this way. Note that, in FIG.
- the AEV value in the first luminance area is expressed as 2 and the AEV value in the second luminance area is expressed as 1, but is not limited to a fixed value. That is, in the graph of FIG. 3, the characteristics of the exposure compensation may be inclined so as to increase or decrease the EV value in accordance with the BV value.
- the first luminance area is a part indicating the brightness under artificial lighting such as in a room.
- light sources with a low color temperature about 3000 mm
- the photometry of the camera is performed based on the spectral sensitivity according to the standard relative luminous efficiency, and the blue exposure tends to be insufficient under illumination with a low color temperature. Therefore, in the first luminance area, the EV value is increased by two levels so that the blue exposure can be increased. In other words, the exposure target value is corrected to increase the exposure by subtracting the EV value from the normal exposure reference value by two.
- the strobe light emitting unit 15 in order to reliably perform shooting with natural light, it is possible to prevent the strobe light emitting unit 15 from emitting light. Specifically, when the BV value is in the first luminance region, a program that prohibits light emission of the light emitting unit 15 can be provided. However, even in this case, the strobe can be forcibly fired by the user's operation.
- the first brightness region is limited to a value where the lower limit BV value force BV value of the shutter controllable range is three.
- the lower limit of the shutter controllable range is the shutter speed, if any, such as camera shake control, which is limited. If there is no regulation, the BV value should be in the range of -3 to 3.
- the second luminance area is a part that shows brightness assuming cloudy weather or fine weather outdoors.
- the color temperature in the second luminance area is moderate (approximately 5000 ⁇ (Kelvin)), and when the BV value obtained by the camera is within the range of the second luminance area, most exposure conditions can be obtained by giving proper exposure. And appropriate shooting can be performed. Therefore, in the second luminance area, it is necessary to consider the variation in the amount of light in the shooting state. Then, in order to prevent underexposure as a whole, raise the EV value by one step. That is, BV The exposure target value is corrected to increase the exposure by subtracting 1 from the EV reference value calculated from the value + SV value.
- the second luminance area is set to a value up to the upper limit BV value of the shutter controllable range with a BV value of 6.
- the upper limit of the shutter controllable range is a speed when the shutter speed is reduced to the limit or a range that can be controlled as a program.
- the average correction value of the AEV value in the first luminance area is ⁇ 1 and the average correction value of the AEV value in the second luminance area is ⁇ 2, ⁇ 1 ⁇ 2 ⁇ 0.8. If an EV value that satisfies is satisfied, an exposure correction value other than the EV value shown in FIG. 3 may be set. Hereinafter, the reason why it is preferable to set ⁇ — ⁇ ⁇ 2 ⁇ 0.8 will be described.
- the spectral sensitivity for each color in a color negative is as shown in the graph of FIG.
- the relative intensities at the color temperatures of typical light sources are as shown in the graph of FIG. Equation 1 below is obtained by calculating the ratio of the product obtained by multiplying the relative spectral sensitivity and the relative intensity at each wavelength of the green sensitive layer and the blue sensitive layer shown in FIGS. .
- This calculation result means that in the color negative, the exposure of the blue-sensitive layer is 1.11 less than that of the green-sensitive layer in terms of EV value.
- the photometry of the camera is performed at a standard relative luminous efficiency according to the spectral sensitivity of the green sensitive layer. For this reason, if exposure correction of +1.11 is performed at the EV value for the camera photometry value, it is possible to give an appropriate exposure to the blue-sensitive layer. On the other hand, for the green sensation layer, an exposure correction of +1.11 is also made for the EV value.
- color negatives have a large latitude against overexposure, so there is no problem with overexposure.
- the numerical condition of ⁇ ⁇ - ⁇ ⁇ 2 ⁇ 0.8 is satisfied! /,
- the power which is the numerical condition calculated in comparison with the light source of 5000 ⁇ is various in the real world.
- Light source is present.
- the EV value may be 0.5 to 0.8.
- FIG. 6 is a flowchart showing the operation of the camera 10.
- the control process of this flowchart is stored in the memory unit 14 and executed by the control unit 19 based on a program.
- control unit 19 determines that the shutter button 11 of the camera 10 has been pressed (S1), it outputs an instruction to the photometric unit 13 to perform photometric processing.
- the photometer 13 detects the external light brightness. And outputs a detection signal.
- the control unit 19 calculates a BV value serving as a luminance value based on the input detection signal (S2).
- the control unit 19 calculates the exposure reference value by adding the SV value and the BV value according to the file sensitivity (S3).
- control unit 19 determines that the film sensitivity detected by the film sensitivity detection unit 12 is IS016
- the control unit 19 corrects the exposure reference value (S5). Specifically, the control unit 19 extracts an AEV value corresponding to the BV value calculated as described above also from the correction control table force. Then, the control unit 19 calculates the exposure target value by correcting the exposure reference value by subtracting the exposure reference value force EV value calculated in S3.
- the control unit 19 performs exposure control using the exposure target value EV (S6).
- the exposure control is to control the lens aperture (AV value) and the shutter speed (TV value).
- This exposure control is performed using, for example, a program diagram as shown in FIG.
- the control unit 19 instructs the shutter part 16 to shoot using the shutter speed and the F-number that have been determined, and the shutter unit 16 performs shooting (the shutter part of the shutter unit 16 (the blades). ), The aperture is opened by the size indicated by the F value, and the shutter is closed after a predetermined time indicated by the shutter speed) (S7).
- FIG. 8 is a conceptual diagram of exposure control different from the exposure control shown in FIG.
- the EV value is controlled to be raised by two levels in the first luminance region indicating the BV value powers ⁇ to 3.
- the EV value No correction is made.
- the strobe light emission is not emitted, and when the BV value is 5 or more, the strobe light emission is controlled to always emit light. This makes it possible to take high-quality and atmospheric photographs at least when indoors without using strobe light. Also, when you are outdoors, you can take high-quality photos even if you use strobe light, because the flash does not often cause the subject to pop out.
- the exposure correction value A EV1 in the first luminance area is changed to the second luminance area.
- Exposure compensation value of A EV2 is set to a value that is at least 0.5 ⁇ or more on average so that appropriate exposure control according to the shooting environment can be performed, and shooting with light that is more realistic than flashlight is easier than using a flash. Can be done. In particular, in a shooting environment under artificial lighting indoors, an appropriate exposure can be given even to the blue-sensitive layer, and higher quality photos can be taken.
- the exposure correction value ⁇ EV1 of the first luminance area is set to a value larger than the exposure correction value ⁇ EV2 of the second luminance area by an average of at least 0.8 Ev, it is more appropriate according to the shooting environment.
- This makes it possible to perform precise exposure control and easily perform shooting with light that is closer to reality than using flash light emission. Also in this case, in a shooting environment under artificial lighting in a room, an appropriate exposure can be given to the blue sensitive layer, and higher quality photography can be performed.
- the camera according to the present embodiment is provided with a strobe light emitting unit that emits strobe light, and when the external light luminance is equal to or less than a predetermined value, the strobe light emitting unit may not emit light. preferable. As a result, it is possible to prevent photographing with artificial light due to strobe light emission, and to easily perform photographing with light that is closer to reality.
- the camera described above based on the camera using the film is not limited to the camera using the film.
- the present invention may be applied to a digital camera using a CCD.
- the set sensitivity of the CCD is detected, and if the set sensitivity is equal to or higher than the ISO sensitivity of 1600, the first luminance set to a lower luminance than the second luminance area In the region, set the exposure compensation value to a large value of at least 0.5 Ev or more on average, and based on the set sensitivity and the Then, the exposure control value may be subtracted from the calculated exposure reference value, and exposure control may be performed as the exposure target value. Even in this case, the same operation and effect as those of the camera according to the above-described embodiment can be obtained.
- the present invention can be used for photographing, and can easily perform high-quality photographing according to the surrounding brightness without performing strobe light emission.
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Abstract
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-181471 | 2004-06-18 | ||
JP2004181471A JP2006003740A (ja) | 2004-06-18 | 2004-06-18 | カメラ |
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WO2005124448A1 true WO2005124448A1 (ja) | 2005-12-29 |
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PCT/JP2005/009995 WO2005124448A1 (ja) | 2004-06-18 | 2005-05-31 | カメラ |
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WO (1) | WO2005124448A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113454530A (zh) * | 2019-02-18 | 2021-09-28 | 三星电子株式会社 | 使用移动电子设备捕获和混合用于高质量闪光摄影的多个图像的装置和方法 |
Families Citing this family (1)
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JP2023176537A (ja) * | 2022-05-31 | 2023-12-13 | キヤノン株式会社 | 画像処理装置及びその制御方法及びプログラム |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0220838A (ja) * | 1988-07-30 | 1990-01-24 | Minolta Camera Co Ltd | フラッシュ撮影における紋り値決定装置 |
JPH0284622A (ja) * | 1989-08-11 | 1990-03-26 | Minolta Camera Co Ltd | 測光装置およびそれを備えたカメラ |
JPH02105120A (ja) * | 1988-10-14 | 1990-04-17 | Nikon Corp | カメラの露出制御装置 |
JPH0267322U (ja) * | 1988-11-09 | 1990-05-22 | ||
JPH03236029A (ja) * | 1990-02-14 | 1991-10-22 | Asahi Optical Co Ltd | カメラの露出制御装置 |
JPH07128703A (ja) * | 1993-11-02 | 1995-05-19 | Olympus Optical Co Ltd | ストロボ制御装置 |
JP2001013541A (ja) * | 1999-06-25 | 2001-01-19 | Fuji Photo Optical Co Ltd | ストロボ発光制御方法及び装置並びにカメラ |
JP2003241248A (ja) * | 2002-02-20 | 2003-08-27 | Nikon System:Kk | 電子カメラ |
-
2004
- 2004-06-18 JP JP2004181471A patent/JP2006003740A/ja active Pending
-
2005
- 2005-05-31 WO PCT/JP2005/009995 patent/WO2005124448A1/ja active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0220838A (ja) * | 1988-07-30 | 1990-01-24 | Minolta Camera Co Ltd | フラッシュ撮影における紋り値決定装置 |
JPH02105120A (ja) * | 1988-10-14 | 1990-04-17 | Nikon Corp | カメラの露出制御装置 |
JPH0267322U (ja) * | 1988-11-09 | 1990-05-22 | ||
JPH0284622A (ja) * | 1989-08-11 | 1990-03-26 | Minolta Camera Co Ltd | 測光装置およびそれを備えたカメラ |
JPH03236029A (ja) * | 1990-02-14 | 1991-10-22 | Asahi Optical Co Ltd | カメラの露出制御装置 |
JPH07128703A (ja) * | 1993-11-02 | 1995-05-19 | Olympus Optical Co Ltd | ストロボ制御装置 |
JP2001013541A (ja) * | 1999-06-25 | 2001-01-19 | Fuji Photo Optical Co Ltd | ストロボ発光制御方法及び装置並びにカメラ |
JP2003241248A (ja) * | 2002-02-20 | 2003-08-27 | Nikon System:Kk | 電子カメラ |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113454530A (zh) * | 2019-02-18 | 2021-09-28 | 三星电子株式会社 | 使用移动电子设备捕获和混合用于高质量闪光摄影的多个图像的装置和方法 |
CN113454530B (zh) * | 2019-02-18 | 2022-11-01 | 三星电子株式会社 | 使用移动电子设备捕获和混合用于高质量闪光摄影的多个图像的装置和方法 |
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