US20030169365A1 - Photographing apparatus and photographing method - Google Patents

Photographing apparatus and photographing method Download PDF

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Publication number
US20030169365A1
US20030169365A1 US10/343,446 US34344603A US2003169365A1 US 20030169365 A1 US20030169365 A1 US 20030169365A1 US 34344603 A US34344603 A US 34344603A US 2003169365 A1 US2003169365 A1 US 2003169365A1
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United States
Prior art keywords
subject
distance
amplification factor
photographing
zoom lens
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.)
Abandoned
Application number
US10/343,446
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English (en)
Inventor
Takahiro Tojo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TOJO, TAKAHIRO
Publication of US20030169365A1 publication Critical patent/US20030169365A1/en
Priority to US12/591,245 priority Critical patent/US8154621B2/en
Abandoned legal-status Critical Current

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    • 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
    • H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • 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
    • H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
    • 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
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals

Definitions

  • the present invention relates to a photographing apparatus and a photographing method which allow a flashlight photographable range to be kept almost constant in lighting photography (such as a flashlight photography) even if a subject is photographed with a zoom lens of which a stop number of brightness (the amount of light which enters a photographing means) of the lens is varied corresponding to the focal distance of the lens.
  • GN guide number
  • Flashlight systems of most cameras have a light adjusting function.
  • the light adjusting function automatically adjusts the emitted light amount of the flashlight so that the subject can be correctly exposed.
  • Japanese Patent Laid-Open Publication No. SHO 56-17577 discloses an invention of which when a zoom magnification becomes large, the diaphragm is not open with the minimum stop number F which is necessary for obtaining a predetermined depth of field.
  • Japanese Patent Laid-Open Publication No. SHO 60-35717 discloses an invention of which a driving portion is disposed at a member which is moved by a zooming operation, a cam portion being disposed at an operating portion to which a diaphragm lever with which a stop-down operation is performed is rotatably disposed, the driving portion and the cum portion being engaged, when the driving portion is moved by the zooming operation, the operating member being driven and thereby the diaphragm lever being deformed, so the fluctuation of the stop number due to the zooming operation can be compensated.
  • Japanese Patent Laid-Open Publication No. 2000-162679 describes an invention of which auxiliary lighting compensates the insufficiency of the emitted light amount of main lighting so as to increase the effective sensitivity of the image pickup device.
  • an object of the present invention is to provide a photographing apparatus and a photographing method which allow a flashlight photographable range to be kept almost constant even if the brightness of a lens is varied due to an F drop when a zooming operation is performed.
  • Claim 1 of the present invention is a photographing apparatus, comprising auxiliary lighting means for lighting a subject; photographing means for photographing the subject; a zoom lens portion for varying the amount of light entered into the photographing means corresponding to a focal distance of the zoom lens portion; and amplifying means for amplifying a picture signal which is output from the photographing means with an amplification factor which has been set, wherein when the subject is photographed with the auxiliary lighting means, a setting of the amplification factor of the amplifying means is changed corresponding to the focal distance.
  • Claim 7 of the present invention is a photographing method, comprising the steps of causing lighting means to light a subject; causing photographing means to photograph the subject; amplifying a picture signal of the photographed subject with an amplification factor which has been set because an amount of light which enters the photographing means of a zoom lens portion is varied corresponding to a focal distance of the zoom lens portion; and changing a setting of the amplification factor corresponding to the focal distance.
  • the subject is lit by the lighting means.
  • the picture signal of the photographed subject is amplified with the amplification factor which has been set.
  • the setting of the amplification factor is changed depending on the focal distance.
  • FIG. 1 is a block diagram showing an overall structure of a camera according to an embodiment of the present invention
  • FIG. 2 is a characteristic diagram for explaining the relation between a stop number F of a lens and a distance D to a subject according to the present invention
  • FIG. 3 is a characteristic diagram for explaining the present invention.
  • FIG. 4 is a flow chart for explaining a control according to an embodiment of the present invention.
  • FIG. 5 is a flow chart showing a first example of an amplitude factor setting control for compensating an F drop according to the present invention
  • FIG. 6 is a flow chart showing a second example of an amplification factor setting control for compensating an F drop according to the present invention
  • FIG. 7 is a flow chart showing a third example of an amplification factor setting control for compensating an F drop according to the present invention.
  • FIG. 8 is a characteristic diagram showing an example of a variation of an amplification factor according to the present invention.
  • FIG. 1 shows an overall structure of an embodiment of the present invention.
  • An image of a subject is entered from the outside.
  • the image is passed through a zoom lens 5 and a diaphragm 6 and then focused on an image pickup device 1 .
  • the image pickup device 1 is composed of for example a CCD (Charge Coupled Device).
  • An image focused on the image pickup device 1 is photoelectrically converted into an electric signal.
  • the electric signal is supplied as a picture signal to an amplifying circuit 2 .
  • the amplifying circuit 2 amplifies the supplied picture signal.
  • an amplification factor of the amplifying circuit 2 is properly set.
  • the picture signal amplified by the amplifying circuit 2 is supplied to an A/D converter 3 .
  • the A/D converter 3 digitizes the amplified picture signal.
  • the digitized picture signal is supplied to a signal processing circuit 4 .
  • the signal processing circuit 4 performs a clamping process, a color signal process, a luminance signal process, and other processes for such as a contour compensation, a defect compensation, and a white balance compensation for the supplied picture signal.
  • the operations of those circuits are controlled by a camera CPU (Central Processing Unit) 11 .
  • a camera CPU Central Processing Unit
  • an automatic focus control of the zoom lens 5 is performed by the camera CPU 11 through a lens driving circuit 8 .
  • An automatic diaphragm control of the diaphragm 6 is performed by the camera CPU 11 through a diaphragm driving circuit 9 .
  • the image pickup device 1 is controlled by the camera CPU 11 through a timing generator 10 .
  • An auxiliary lighting portion 7 emits light for an amount (namely, adjusted light amount) corresponding to a control signal supplied from the camera CPU 11 at a predetermined timing.
  • a signal which is output from an operating portion 12 operated by the user is supplied to the camera CPU 11 .
  • the operating portion 12 is used to set for example the amplification factor of the amplifying circuit 2 for the picture signal as will be described later.
  • GN represents the GN value of the flashlight
  • F represents the stop number
  • D represents the distance to the subject.
  • the distance D to the subject becomes around 3.6 m.
  • the range of around 3.6 m is the flashlight photographable range.
  • the subject can be photographed with a correct exposure.
  • the distance D to the subject exceeds the flashlight photographable range (around 3.6 m)
  • the subject is under-exposed.
  • the distance D to the subject becomes around 1.8 m.
  • the range of around 1.8 m is the flashlight photographable range. In the range of around 1.8 m, the subject can be flashlight photographed always with a correct exposure by the light adjusting function.
  • the GN value of the auxiliary lighting portion 7 disposed in the camera body cannot sufficiently correspond to the variation of the stop number F due to the limitation of the size and power consumption of the auxiliary lighting portion 7 .
  • the camera is provided with the auxiliary lighting portion 7 whose GN value is 10 and the zoom lens 5 of which the brightness of the lens varies from F2.8 at the wide end to F5.6 at the tele end as an F drop.
  • the auxiliary lighting portion 7 whose GN value is 10 and the zoom lens 5 of which the brightness of the lens varies from F2.8 at the wide end to F5.6 at the tele end as an F drop.
  • the image pickup device 1 outputs a picture signal based on for example ISO (International Organization for Standardization) speed 100
  • ISO International Organization for Standardization
  • the amplifying circuit 2 amplifies the picture signal with an amplification factor which has been set.
  • the image pickup device 1 when the stop number of the zoom lens 5 is F2.8, the image pickup device 1 outputs a picture signal of ISO speed 100.
  • the amplifying circuit 2 since the amplifying circuit 2 does not need to amplify the picture signal which is output from the image pickup device 1 , as shown in FIG. 3B, the amplification factor is 0 dB.
  • the amplifying circuit 2 amplifies the picture signal which is output from the image pickup device 1 so that the picture signal becomes a signal of ISO speed 200.
  • the amplification factor is 6 dB.
  • the amplifying circuit 2 amplifies the picture signal which is output from the image pickup device 1 so that the picture signal becomes a signal of ISO speed 400.
  • the amplification factor is 12 dB.
  • (formula 1) is based on ISO speed 100.
  • (formula 1) can be expressed with (formula 2).
  • the flashlight photographable range becomes around 3.6 m.
  • step S 1 it is determined whether or not the shutter of the camera has been pressed halfway.
  • the flow advances to step S 2 .
  • the flow cycles at step S 1 until the shutter has been pressed halfway.
  • step S 2 it is determined whether or not flashlight photography is performed.
  • the flow advances to step S 3 .
  • the flow advances to step S 8 .
  • the brightness around the camera may be automatically measured.
  • it may be determined whether or not flashlight photography is set. Alternatively, flashlight photography may be set by user's operation.
  • step S 3 it is determined whether or not the shutter has been pressed deeply.
  • the flow advances to step S 4 .
  • the flow returns to step S 1 .
  • step S 4 a subroutine which will be described later is called.
  • an amplification factor of the amplifying circuit 2 is set so that the decrease of the sensitivity of the image pickup device 1 due to an F drop is compensated.
  • step S 5 the exposure of the image pickup device 1 is started.
  • step S 6 the auxiliary lighting portion 7 emits light for a predetermined amount.
  • step S 7 the exposure of the image pickup device 1 is finished. Thereafter, the control of the flow chart is finished.
  • step S 8 it is determined whether or not the shutter has been pressed deeply.
  • step S 9 it is determined whether or not the shutter has been pressed deeply.
  • the flow returns to step S 1 .
  • step S 9 the exposure of the image pickup device 1 is started. Thereafter, the flow advances to step S 7 .
  • FIG. 5 a first example of an amplification factor setting control for compensating an F drop at step S 4 will be described.
  • the flow chart shown in FIG. 5 represents a subroutine which is called when the flow advances to step S 4 .
  • step S 11 the GN value of the auxiliary lighting portion 7 and the stop number Fmin at which the zoom lens 5 becomes the brightest are obtained.
  • the current stop number F of the zoom lens is detected.
  • an amplification factor corresponding to the calculated ISO speed S is set.
  • FIG. 6 a second example of the amplification factor setting control for compensating the F drop at step S 4 will be described.
  • the flow chart shown in FIG. 6 represents an example of which an amplification factor is set corresponding to the brightness.
  • the flow chart shown in FIG. 6 represents a subroutine which is called when the flow advances to step S 4 .
  • a reference value Eref with which brightness is compared is set.
  • the photometry means detects the brightness E around the camera.
  • step S 24 the GN value of the auxiliary lighting portion 7 and the stop number Fmin at which the zoom lens 5 becomes the brightest are obtained.
  • step S 26 the current stop number F of the zoom lens 5 is detected.
  • step S 28 an amplification factor corresponding to the calculated ISO speed S is set.
  • step S 4 the subroutine of the flow chart shown in FIG. 6 has been called.
  • an amplification factor is not set.
  • FIG. 7 a third example of the amplification factor setting control for compensating the F drop at step S 4 will be described.
  • the flow chart shown in FIG. 7 represents an example of which an amplification factor is set corresponding to the distance.
  • the flow chart shown in FIG. 7 represents a subroutine which is called when the flow advances to step S 4 .
  • step S 31 the GN value of the auxiliary lighting portion 7 and the current stop number F of the zoom lens 5 are obtained.
  • step S 33 the distance d to the subject is detected by the distance measuring means.
  • step S 34 it is determined whether or not the subject is closer than the reference distance Dref. In other words, it is determined whether or not the distance D detected by the distance measuring means is equal to or smaller than the reference distance Dref.
  • the subroutine of the flow chart is finished.
  • the flow advances to step S 35 .
  • step S 35 the stop number Fmin with which the zoom lens 5 becomes the brightest is obtained.
  • step S 38 an amplification factor corresponding to the calculated ISO speed S is set.
  • step S 4 After the subroutine of the flow chart shown in FIG. 7 is finished, the flow returns to step S 4 at which the subroutine of the flow chart shown in FIG. 7 has been called.
  • an amplification factor is not set.
  • an amplification factor is set at step S 4 , one of the subroutines of the flow charts shown in FIGS. 5, 6, and 7 may be selected.
  • an amplification factor may not be set.
  • the amplification factor may be increased in proportion to the focal distance.
  • the amplification factor may be linearly increased corresponding to the focal distance.
  • the amplification factor may be calculated by the forgoing (formula 2) whenever necessary.
  • the amplification factor may be set stepwise or linearly in consideration of the balance with a real picture.
  • the relation between the focal distance and the amplification factor may be pre-set at factory before shipment. Alternatively, the relation may be freely set by the user. When the user sets the relation, he or she may set it in a menu format with the operating portion 12 .
  • the effective sensitivity of the image pickup device 1 is ISO speed 100 and the zoom lens 5 has a stop number in the range from F2.8 to F5.6.
  • the amplification factor of the amplifying circuit 2 is set so that when the stop number becomes F5.6 as the result of the zooming operation, the effective sensitivity of the image pickup device 1 becomes equivalent to ISO speed 400. Consequently, a photographing distance at which the stop number is F2.8 is in the flashlight photographable range without need to approach the subject. In other words, the amount of light decreased due to the F drop can be compensated by varying the amplification factor.
  • the amplification factor is increased corresponding to the amount of light which is decreased in proportion to the focal distance, since the noise component is also amplified, the quality of the supplied picture is deteriorated. Thus, it is important to balance the picture quality and correct exposure, not simply set the amplification factor corresponding to the focal distance.
  • the upper limit of the amplification factor to be set may be up to for example ISO speed 200.
  • a proper amplification factor may be set by determining whether to increase the amplification factor.
  • the amplification factor may be properly set.
  • the auxiliary lighting portion 7 is disposed in the camera.
  • the auxiliary lighting portion 7 may be separated from the camera body.
  • the zoom lens 5 is disposed in the camera.
  • the zoom lens 5 may be detachable from the camera body.
  • an F drop of the zoom lens causes the amount of light which enters the image pickup device to be decreased.
  • the amplification factor by varying the amplification factor, the decrease of the light amount can be compensated.
  • the flashlight photographable range can be kept almost constant.
  • an amplification factor with which a picture signal supplied from the image pickup device is amplified can be properly set regardless of the F drop of the zoom lens. Thus, over-exposure and occurrence of noise can be suppressed.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)
  • Exposure Control For Cameras (AREA)
  • Cameras In General (AREA)
  • Color Television Image Signal Generators (AREA)
US10/343,446 2001-06-26 2002-05-14 Photographing apparatus and photographing method Abandoned US20030169365A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/591,245 US8154621B2 (en) 2001-06-26 2009-11-13 Photographing apparatus and photographing method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001193383A JP3744388B2 (ja) 2001-06-26 2001-06-26 撮像装置および撮像方法
JP2001-193383 2001-06-26

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US12/591,245 Continuation US8154621B2 (en) 2001-06-26 2009-11-13 Photographing apparatus and photographing method

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US12/591,245 Expired - Fee Related US8154621B2 (en) 2001-06-26 2009-11-13 Photographing apparatus and photographing method

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US (2) US20030169365A1 (fr)
EP (1) EP1404124B1 (fr)
JP (1) JP3744388B2 (fr)
KR (1) KR100859151B1 (fr)
TW (1) TW548505B (fr)
WO (1) WO2003001796A1 (fr)

Cited By (3)

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US20050052566A1 (en) * 2002-12-27 2005-03-10 Casio Computer Co., Ltd. Imaging device, focusing method and program
US20050157206A1 (en) * 2004-01-16 2005-07-21 Casio Computer Co., Ltd. Image capture device with automatic adjusting function for sensitivity
DE102013209164A1 (de) * 2013-05-17 2014-12-04 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Digitale filmkamera

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JP2005189547A (ja) * 2003-12-25 2005-07-14 Ricoh Co Ltd 電子撮影装置
TWI520602B (zh) * 2011-02-15 2016-02-01 佳能企業股份有限公司 曝光參數補正方法及成像裝置
KR102694094B1 (ko) * 2022-03-28 2024-08-12 한국광기술원 카메라 교환렌즈 제어장치 및 그를 포함하는 카메라

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Publication number Priority date Publication date Assignee Title
US20050052566A1 (en) * 2002-12-27 2005-03-10 Casio Computer Co., Ltd. Imaging device, focusing method and program
US20100247084A1 (en) * 2002-12-27 2010-09-30 Casio Computer Co., Ltd. Imaging device, focusing method and program
US8102462B2 (en) 2002-12-27 2012-01-24 Casio Computer Co., Ltd. Imaging device, focusing method and program
US20050157206A1 (en) * 2004-01-16 2005-07-21 Casio Computer Co., Ltd. Image capture device with automatic adjusting function for sensitivity
EP1578117A2 (fr) * 2004-01-16 2005-09-21 Casio Computer Co., Ltd. Dispositif de prise de vue et méthode de réglage de la sensibilité associé
EP1578117A3 (fr) * 2004-01-16 2006-07-12 Casio Computer Co., Ltd. Dispositif de prise de vue et méthode de réglage de la sensibilité associé
US7525592B2 (en) 2004-01-16 2009-04-28 Casio Computer Co., Ltd. Image capture device with automatic adjusting function for sensitivity
DE102013209164A1 (de) * 2013-05-17 2014-12-04 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Digitale filmkamera
DE102013209164B4 (de) 2013-05-17 2023-01-19 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Digitale Filmkamera

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Publication number Publication date
US8154621B2 (en) 2012-04-10
JP3744388B2 (ja) 2006-02-08
US20100097500A1 (en) 2010-04-22
WO2003001796A1 (fr) 2003-01-03
KR20030029126A (ko) 2003-04-11
TW548505B (en) 2003-08-21
JP2003008989A (ja) 2003-01-10
KR100859151B1 (ko) 2008-09-19
EP1404124A1 (fr) 2004-03-31
EP1404124A4 (fr) 2005-11-09
EP1404124B1 (fr) 2013-01-02

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