CN106027914B - Photographic device and image capture method - Google Patents
Photographic device and image capture method Download PDFInfo
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- CN106027914B CN106027914B CN201610173587.5A CN201610173587A CN106027914B CN 106027914 B CN106027914 B CN 106027914B CN 201610173587 A CN201610173587 A CN 201610173587A CN 106027914 B CN106027914 B CN 106027914B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims description 21
- 230000035945 sensitivity Effects 0.000 description 44
- 238000003384 imaging method Methods 0.000 description 15
- 230000033001 locomotion Effects 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000015654 memory Effects 0.000 description 4
- 230000003796 beauty Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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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
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Exposure Control For Cameras (AREA)
- Studio Devices (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
The photographic device and image capture method that flashing will not be generated in the picture changing f-number are provided.In subject brightness change, in the case where maintaining correct exposure amount and changing the f-number of aperture, after driving aperture changes and is open and has adjusted light exposure (moment T1~T2), according to the variation of the opening of aperture, electronic shutter speed is changed by the magnifying power or electronic shutter speed setup unit of the picture element signal in amplifying unit to adjust light exposure (moment T2~T4).
Description
Technical field
The present invention relates to also can in the case where changing f-number when dynamic image is shot or when live view is shown
Carry out the photographic device and image capture method of the spectrum assignment as correct exposure amount.
Background technique
In the photographic devices such as camera, in dynamic image shooting or when live view is shown, when driving aperture, also
Electronic shutter speed and ISO sensitivity are adjusted simultaneously, thus maintains correct exposure amount.But since aperture carries out Mechanical Driven,
So movement generates delay, and in contrast, since electronic shutter speed or ISO sensitivity are electrical controls, so, it is dynamic in change
The hardly delay of generation time in work.Therefore, generation time is poor before reaching the exposure for wishing to set, in dynamic image
Or flashing is generated in the image that shows of live view, become the picture for being not easy observation.
Therefore, it is proposed to following photographic device: calculating current aperture position according to the driving speed of aperture and target value
Predicted value keep the exposure settings of electronic shutter speed or ISO sensitivity consistent with the f-number predicted according to the predicted value
To be acted (referring to Japan Kokai 2013-031010 bulletin (hereinafter referred to as " patent document 1 ")).
It is photosensitive due to controlling electronic shutter speed or ISO according to the predicted value of f-number in above patent document 1
Degree can reduce the flashing of picture thus it is possible to which exposure is inhibited to change.But the f-number of prediction and actual f-number are very
It is difficult completely the same, therefore, in dynamic image shooting or exposure is generated when live view is shown and is changed, image flicker.
Summary of the invention
The present invention is to complete in light of this situation, it is intended that providing will not scheme changing f-number
The photographic device and image capture method of flashing are generated as in.
The photographic device of 1st invention includes photographing element, images to the object light for passing through photographic optical system
And generate picture element signal；Aperture limits the light beam for passing through above-mentioned photographic optical system；Amplifying unit, with regulation
Magnifying power amplify the picture element signal that above-mentioned photographing element generates；And control unit, change said aperture opening and on
The magnifying power for stating amplifying unit adjusts the light exposure of the image data based on the picture element signal generated by above-mentioned photographing element
Section, above-mentioned control unit in driving said aperture, change opening and after having adjusted light exposure, according to the opening of said aperture
Variation changes the magnifying power of above-mentioned amplifying unit when adjusting light exposure, to change the magnifying power of above-mentioned amplifying unit, so that becoming
With the consistent variation of exposure speed of variation of exposure speed corresponding with the variation of the opening of said aperture.
The photographic device of 2nd invention includes photographing element, images to the object light for passing through photographic optical system
And generate picture element signal；Aperture limits the light beam for passing through above-mentioned photographic optical system；Electronic shutter speed setting is single
Member sets the electronic shutter speed of above-mentioned photographing element；And control unit, the opening of change said aperture and above-mentioned electricity
The electronic shutter speed of sub- shutter speed settings unit, to the image data based on the picture element signal generated by above-mentioned photographing element
Light exposure be adjusted, above-mentioned control unit in driving said aperture, change opening and after having adjusted light exposure, according to by
The electronic shutter speed that variation of exposure caused by the variation of the opening of said aperture changes above-mentioned electronic shutter speed unit is come
Adjust light exposure when, change the electronic shutter speed of above-mentioned electronic shutter speed setup unit so that become with and said aperture
Opening the consistent variation of exposure speed of the corresponding variation of exposure speed of variation.
About the image capture method in the photographic device of the 3rd invention, which includes photographing element, takes the photograph to passing through
The object light of shadow optical system is imaged and generates picture element signal；And aperture, to across above-mentioned photographic optical system
Light beam limited, which includes the following steps: to amplify with defined magnifying power what above-mentioned photographing element generated
Picture element signal is carried out with above-mentioned magnifying power in the opening for changing said aperture based on the pixel letter generated by above-mentioned photographing element
Number image data light exposure adjusting when, in driving said aperture, change opening and after having adjusted light exposure, according to upper
The variation for stating the opening of aperture changes above-mentioned magnifying power when adjusting light exposure, to change above-mentioned electronic shutter speed, so that becoming
With the consistent variation of exposure speed of variation of exposure speed corresponding with the variation of the opening of said aperture.
About the image capture method in the photographic device of the 4th invention, which includes photographing element, takes the photograph to passing through
The object light of shadow optical system is imaged and generates picture element signal；And aperture, to across above-mentioned photographic optical system
Light beam limited, which includes the following steps: the electronic shutter speed for setting above-mentioned photographing element, is changing
The opening of said aperture carries out the image based on the picture element signal generated by above-mentioned photographing element with above-mentioned electronic shutter speed
When the adjusting of the light exposure of data, in driving said aperture, change opening and after having adjusted light exposure, according to by said aperture
Opening variation caused by variation of exposure to change above-mentioned electronic shutter speed fast when adjusting light exposure, to change above-mentioned electronics
Door speed, so that becoming and the consistent variation of exposure speed of variation of exposure speed corresponding with the variation of the opening of said aperture
Degree.
In accordance with the invention it is possible to provide the photographic device that will not generate flashing in the picture changing f-number and take the photograph
Image space method.
Detailed description of the invention
Fig. 1 is the block diagram for showing the essential electrical structure of the camera of an embodiment of the invention.
Fig. 2 is related to the camera of an embodiment of the invention, is the curve graph for showing aperture control action.
Fig. 3 is related to the camera of an embodiment of the invention, is the flow chart for showing spectrum assignment movement.
Fig. 4 is related to the camera of an embodiment of the invention, is the flow chart for showing spectrum assignment movement.
Specific embodiment
In the following, being illustrated to the example that the present invention is applied to digital camera as an embodiment.The number
Word camera has image pickup part, shot object image is converted to image data by the image pickup part, according to the picture number after the conversion
According to live view shows shot object image in the display unit for being configured at the main body back side.Photographer passes through observation live view and shows,
Determine composition and right moment for camera.When operating dynamic image button etc., the image data of start recording dynamic image, when grasping again
Whens making dynamic image button etc., terminate the record of the image data of dynamic image.Also, pass through operation release button, additionally it is possible to
Carry out the shooting of still image.When selecting reproduction mode, can be recorded in reproduction display recording medium in display unit quiet
The image data of state image or dynamic image.
Also, it is photosensitive to change ISO after changing the amount of opening of aperture and having adjusted light exposure for the camera of present embodiment
Degree or electronic shutter speed, so that the pace of change of light exposure corresponding with the variation of the opening with aperture is consistent (in detail
Say Δ Ev, Fig. 4 of (b) referring to Fig. 2).
Fig. 1 is the block diagram for showing the essential electrical structure of the camera of present embodiment.The camera has photograph owner
Body 10 and the lens barrel 20 that can be assemblied on camera body 10.In addition, present embodiment is to be separately constructed photograph owner
The so-called lens exchange type camera of body 10 and lens barrel 20.It is however not limited to which this, is also possible to lens barrel and photograph
The form of the integrated camera of owner's body.
Control unit 11, imaging control part 15, photographing element 16, mechanical shutter 17 are configured in camera body 10.
Mechanical shutter 17 is disposed on the so-called focal-plane shutter or between-the-lens shutter of the front-surface side of photographing element 16.
In still image shooting, which makes in regulation time for exposure (being determined by shutter speed) from lens barrel
20 object beam passes through.Also, in dynamic image shooting or when live view is shown, mechanical shutter 17, which becomes, to be opened
State.
Photographing element 16 configures on the extended line of the optical axis O of the optical system of lens barrel 20.Photographing element 16 has
Multiple photoelectric conversion pixels receive the shot object image (light image) being imaged by lens barrel 20 in imaging surface, pass through each photoelectricity
It converts pixel and photoelectric conversion is carried out to the shot object image, generate picture element signal, be output to imaging control part 15.
Imaging control part 15 carries out reading picture element signal from photographing element 16 according to the control signal from control unit 11
Read control.Imaging control part 15 has the function of the electronic shutter movement for setting photographing element 16, can control multiple photoelectricity
Convert the time for exposure (electronic shutter speed) in pixel.Also, by being amplified with defined magnifying power from multiple photoelectric conversions
The picture element signal read in pixel can control ISO sensitivity.Imaging control part 15 is as with defined magnifying power amplifying camera
The amplifying unit for the picture element signal that element generates functions.
Control unit 11 includes CPU (Central Processing Unit) or ASIC (Application Specific
Integrated Circuit) etc. peripheral circuits, carry out camera body 10 and lens barrel 20 control.Particularly, CPU root
According to the program stored in the nonvolatile memories such as flash memory, the control of camera entirety is carried out.There is exposure in control unit 11
Setting value operational part 12, f-number receiving and transmitting part 13, shutter speed/sensitivity operation control part 14.F-number receiving and transmitting part 13 includes
Telecommunication circuit, also, each portion is executed by CPU with software mode.
Control unit 11 is functioned as following control unit: change the opening of aperture and the magnifying power of amplifying unit,
The light exposure of the image data of the picture element signal generated based on photographing element is adjusted, the control unit driving aperture and
Change after being open and having adjusted light exposure, the magnifying power of above-mentioned amplifying unit is changed according to the variation of the opening of said aperture to adjust
It saves light exposure (referring for example to (b) of Fig. 2, the S11-S19 of S5~S9 of Fig. 3, Fig. 4).The control unit changes amplifying unit
Magnifying power, to make it the variation of the consistent light exposure of pace of change of light exposure corresponding with the variation of the opening with aperture
Speed (S13~S19 of Δ Ev, Fig. 4 of T1~T4 at the time of referring for example in (b) of Fig. 2).Also, control unit is driving
Aperture and when changing opening, on spectrum assignment, for example, f-number reaches the maximum for the range that exposure is followed in program line chart
Value, in the case where minimum value (hereinafter referred to as open limit), change the magnifying power of amplifying unit adjust light exposure (referring for example to
Before T2 is switched to the light exposure adjusting of ISO sensitivity Sv, reaches open limit from f-number Av at the time of in (b) of Fig. 2
The S5 "Yes" of Fig. 3, S7, S9, the S11~S19 for reaching S5 "No" after open limit, Fig. 4).
Control unit 11 is functioned as following control unit: opening and the electronic shutter speed setting for changing aperture are single
The electronic shutter speed of member, is adjusted the light exposure of the image data based on the picture element signal generated by photographing element, should
Control unit is after driving aperture changes and is open and has adjusted light exposure, according to caused by the variation as the opening of said aperture
Light exposure variation change electronic shutter speed unit electronic shutter speed come adjust light exposure (referring for example to Fig. 2 (b),
The S21-S27 of S5~S9 of Fig. 3, Fig. 4).The control unit changes the electronic shutter speed of electronic shutter speed setup unit, with
So that become light exposure corresponding with the variation of the opening with aperture the consistent light exposure of pace of change pace of change (such as
S21~S27 of Δ Ev, Fig. 4 of T1~T4 at the time of in (b) of reference Fig. 2).Also, control unit changes in driving aperture
When opening, in the case where reaching open limit, changes the electronic shutter speed of electronic shutter speed setup unit and exposed to adjust
(T2 is adjusted from the light exposure that f-number Av is switched to ISO sensitivity Sv, is reached out light quantity at the time of referring for example in (b) of Fig. 2
The S5 "Yes" of Fig. 3 before mouthful limit, S7, S9, the S21~S27 for reaching S5 "No" after open limit, Fig. 4).
Exposure settings value operational part 12 in control unit 11 inputs picture element signal from imaging control part 15, according to based on the picture
The subject brightness of plain signal, calculate for as the f-number of correct exposure, mechanical shutter speed, electronic shutter speed,
ISO sensitivity etc. is output to f-number receiving and transmitting part 13 and shutter speed/sensitivity operation control part 14.Also, via light
The information of f-number of the input of circle value receiving and transmitting part 13 from 20 side of lens barrel.Exposure settings value operational part 12 is as setting camera shooting
The electronic shutter speed setup unit of the electronic shutter speed of element functions.
F-number receiving and transmitting part 13 has logical for what is transmitted and received between camera body 10 and lens barrel 20
Believe circuit, sends 20 side of lens barrel for the calculated f-number of exposure settings value operational part 12 of 10 side of camera body
Aperture operation control part 23.Also, aperture is changed to based on by zoom in the aperture operation control part 23 of 20 side of lens barrel
In the case where the f-number for the focal length (zoom encoder value) that position detection part 24 detects, f-number receiving and transmitting part 13 receives the change
F-number after more.
Shutter speed/input of sensitivity operation control part 14 is by the calculated electronic shutter speed of exposure settings value operational part 12
Degree or ISO sensitivity carry out action control to make it the electronic shutter speed or ISO sensitivity.Also, in still image
When shooting, the control of mechanical shutter 17 is carried out, to make it by the calculated shutter speed of exposure settings value operational part 12.
In dynamic image shooting or when live view is shown, mechanical shutter 17 is made to become open state.
There is preceding group of camera lens 21b in lens barrel 20, rear group camera lens 21a, aperture 22, aperture operation control part 23, become
Burnt position detection part 24, aperture operating member 25, zoom control section 26.
Preceding group of camera lens 21b and rear group camera lens 21a (being phtographic lens 21 or photographic optical system in the case where general name) are logical
It crosses and the focus lens in phtographic lens 21 is adjusted, shot object image can be formed in the imaging surface of photographing element 16, lead to
It crosses and the zoom lens in phtographic lens 21 is adjusted, focal length can be changed.
Aperture 22 configures in the optical path of phtographic lens 21.By aperture operating member 25, to the opening diameter of aperture 22 into
Capable mechanically variable drive.By changing opening diameter, the subject light quantity for being incident on photographing element 16 can be changed.That is,
Aperture 22 is functioned as the aperture limited the light for passing through photographic optical system.
Zoom position test section 24 has so-called zoom encoder, detects the position of the zoom lens in phtographic lens 21
It sets, is output to aperture operation control part 23.
Zoom control section 26 carries out drive control to the zoom lens of phtographic lens 21 according to the manual operation of photographer.Separately
Outside, it can also be the direct manual actuation of photographer other than actuator electric drive control about zoom control section 26
Type.
As described above, aperture operation control part 23 controls aperture operating member 25, to make it via f-number
The f-number that receiving and transmitting part 13 inputs.Also, aperture operation control part 23 is via f-number receiving and transmitting part 13 by its internal memory
The aperture driving speed information of middle storage is sent to exposure settings value operational part 12.Also, aperture operation control part 23 according to by
The focal length that zoom position test section 24 detects controls aperture operating member 25, so that f-number is kept constant.
Then, the aperture control action in present embodiment is illustrated using Fig. 2.For easy understanding this embodiment party
Aperture control action in formula, firstly, (a) using Fig. 2 is illustrated existing aperture control action.
As described above, in dynamic image record or during live view show, though using the f-number prediction of camera lens, also with
Error is generated between actual f-number, ISO sensitivity or the electronic shutter speed found out by the exposure operation based on predicted value
The variation of degree and actual aperture position are not quite identical, generate error relative to optimum exposure.Due to there are the error, when
Aperture also controls other exposures (ISO sensitivity or electronic shutter speed) while driving when, shooting brightness generates flashing.
In the example shown in (a) of Fig. 2, horizontal axis is taken frame number (time), and the longitudinal axis indicates that subject brightness (Bv), electronics are fast
The variation of deviation (Δ Ev) between door speed (Tv), f-number (Av), ISO sensitivity (Sv) and correct exposure.Currently, exist
Moment T1, when subject brightness Bv from 10 variations for 5 when, in order to maintain correct exposure amount, consider dynamic image or live view
The beauty of display and aperture control is carried out by the aperture driving speed of low speed, make f-number Av from 9 slowly variation be 6, when
T2 is carved, f-number Av reaches 6.In the lens barrel 20, according to open limit, f-number Av is set as will not be less than 6.Cause
This, in order to maintain correct exposure amount, in moment T2, changing ISO sensitivity Sv from 5 is 7.
In this way, gradually changed in the example shown in (a) of Fig. 2 in moment T1~T2, f-number Av, moment T2~
T3, ISO sensitivity Sv change dramatically.Therefore, the exposure that the exposure in moment T1~T2 is followed in speed and moment T2~T3 chases after
With speed difference, as a result, the brightness change of image increases (referring to the variation of the Δ Ev in figure).About dynamic image or in real time
It finds a view display, image flicker is seen in region 31, beauty is deteriorated.
Screening-mode when as dynamic image record, is setting program schema (P mode) or Shutter speed priority mould
In the case where formula (S mode), follow up action is exposed generally according to following sequence.
(i) for example become the situation of subject brightness Bv changed greatly when carrying out pan-tilt movement.
(ii) f-number Av is followed with slower speed, to make it correct exposure amount Ev.
(iii) f-number Av reaches the limit (open limit) on spectrum assignment.
(iv) change ISO sensitivity Sv or electronic shutter speed Tv, be set as correct exposure amount Ev.In this case, Sv, Tv are anxious
Drastic change.
In above-mentioned exposure follow up action, such as (a) explanation using Fig. 2, due to ISO sensitivity or electronic shutter
Speed Tv change dramatically, so, the brightness change of image is larger, image flicker.Therefore, in the present embodiment, to above-mentioned
(iv) processing carries out the change of (iv ') (iv ") below to solve.
(iv ') sets the upper limit to the exposure amount of change of 1 interframe of ISO sensitivity Sv, electronic shutter speed Tv.
(iv ") sets the upper limit of exposure amount of change according to the aperture driving speed information obtained from lens barrel, by ISO
The exposure of sensitivity Sv, electronic shutter speed Tv are followed speed and are located on the extended line that the exposure of f-number Av is followed.
(b) of Fig. 2 shows an example of the aperture drive control in the case where the change for having carried out above-mentioned (iv ') (iv ").?
In the example, electronic shutter speed (Tv) is fixed, changes f-number (Av) and ISO sensitivity (Sv).It is solid at ISO sensitivity (Sv)
In the case where determining and changing f-number (Av) and electronic shutter speed (Tv), also become the identical control with (b) of Fig. 2.
Also, in (b) of Fig. 2, Bv is set as the subject brightness of the difference (Δ Ev) comprising shooting brightness and object brightness,
Bv can be calculated by following (1) formulas.In addition, shooting brightness obtains in the case where indicating and being shot with current exposure settings
The comparable brightness of the brightness of the image arrived.It is acquired in the case where current exposure settings set from optimum exposure and deviate
Image become under-exposed or over-exposed relative to correct exposure.Object brightness indicates and the feelings as optimum exposure setting
The comparable brightness of the brightness of the image obtained under condition.
Bv=Tv+Av+Sv+ Δ Ev ... (1)
(b) of Fig. 2 shows the case where example of (a) of Fig. 2 is applied to present embodiment, the lower limit value of f-number Av
(open limit) is 6, if the upper limit of the variable quantity of 1 interframe is 0.2.
It in this example embodiment, is 5 from 10 variations in moment T1, subject brightness Bv, it is 6 that f-number Av slowly changes from 9,
Moment T2, f-number Av reach 6.In the lens barrel, due to f-number Av will not less than 6, so, in order to maintain suitably to expose
Light quantity, changing in moment T2, ISO sensitivity Sv from 5 is 7.
In the example shown in (a) of Fig. 2, the time of moment T2~T3 is the extremely short time, and ISO sensitivity Sv is anxious from 5
Drastic change turns to 7.But in the example shown in (b) of Fig. 2, the time of time ratio T2~T3 of moment T2~T4 is long.Therefore,
Brightness change is smaller, and when being considered as dynamic image, in region 32, image will not flash, and beauty will not be deteriorated.
In turn, in the example shown in (b) of Fig. 2, the change rate and moment T2 of the luminance difference (Δ Ev) of moment T1~T2
The change rate of the luminance difference (Δ Ev) of~T4 is identical, that is, becomes straight line in moment T1~T4, luminance difference Δ Ev.Therefore, bright
Degree variation is constant, so the flashing of image can be made minimum.
Then, aperture drive actions in present embodiment are illustrated using Fig. 3 and flow chart shown in Fig. 4.Separately
Outside, the CPU in control unit 11 controls each portion according to the program stored in memory (not shown), thus executes the stream
Journey.
After process shown in Fig. 3 starts, firstly, calculating subject brightness (Bv) (S1).Here, exposure settings value operation
Portion 12 inputs the picture element signal from photographing element 16 via imaging control part 15, calculates subject brightness according to the picture element signal
(Bv)。
After calculating subject brightness (Bv), then, aperture driving speed information is obtained from camera lens (lens barrel 20), it will
Exposure variations amount is set as clamp value (S3).Here, aperture driving is obtained from the aperture operation control part 23 in lens barrel 20
Velocity information.Also, exposure variations amount is set as clamp value, that is, according to the aperture driving speed obtained from lens barrel 20
Information sets the upper limit of exposure variations amount.The exposure of ISO sensitivity Sv, electronic shutter speed Tv is set to follow velocity potential as a result,
In on the extended line that speed is followed in the exposure of f-number Av.
It is determined that whether exposure linkage range is in the mobile range of aperture (in the range of opening limitation) (S5).This
In, become correct exposure in order to correspond to the brightness change of subject, judgement be only change f-number Av can or only light
Circle value Av not enough also needs to change ISO sensitivity Sv or electronic shutter speed Tv.This is because since f-number Av is from opening
In f-number to the limited range of maximum diminution value, so, according to the variation of subject brightness, only change f-number Av, sometimes
It is unable to get correct exposure amount.
Judgement result in step s 5 is for obtaining the exposure linkage range of the correct exposure amount model mobile in aperture
In the case where in enclosing, ISO sensitivity Sv and electronic shutter speed Tv is made to fix (S7).In this case, obtaining correct exposure amount
When, the fixed Sv and Tv currently set.
Then, aperture settings value (S9) is calculated by Av=Bv- (Sv-Tv).Since Sv and Tv are fixed, so, exposure is set
Definite value operational part 12 is calculated as the Av of correct exposure amount according to these values.The calculated aperture settings value is received via f-number
Hair portion 13 is sent to lens barrel 20, and the drive control of aperture 22 is carried out by aperture operation control part 23.
On the other hand, judgement result in step s 5 is to link range not in light for obtaining the exposure of correct exposure amount
In the case where enclosing in mobile range, (S11) is followed it is determined whether being exposed using ISO sensitivity Sv.For example,
In program line chart, Bv value be located at can change in the region of ISO sensitivity Sv in the case where, change ISO sensitivity Sv come into
Row exposure is followed, and in the case where Bv value, which is not, can change the region of ISO sensitivity Sv, changes electronic shutter Tv to be exposed
Light is followed.Be exposed follow when, exist and be exposed the method followed using ISO sensitivity and using electronic shutter speed
It is exposed the method followed.It can be set automatically in set screening-mode, also, multiple methods can used
In the case of, it can also be manually set by photographer.
In the case that judgement result in step s 11 is is exposed using Sv and follows, fixed aperture value Av and electronics
Shutter speed Tv (S13).
Then, Sv setting value (S15) is calculated by Sv=Av+Tv-Bv.Since Av and Tv are fixed, so, exposure settings value
Operational part 12 is calculated as the ISO sensitivity Sv of correct exposure amount according to these values.The calculated ISO sensitivity value Sv is sent out
It is sent to shutter speed/sensitivity operation control part 14, the control of ISO sensitivity Sv is carried out in imaging control part 15.
After calculating Sv setting value, it is determined that the absolute value (Sv variable quantity) of " this frame Sv (Sv setting value)-previous frame Sv "
Whether be exposure variations amount clamp value (S3) corresponding with the driving speed of the aperture of lens barrel 20 or more exposure variations amount
(S17).In exposure is followed, controlling value is indicated according to each reading frame from imaging pixels 16, changes light exposure, is becoming
Before correct exposure amount, controlled in the range of multiple frames.In this step, determined, in the frame to prevent this
Sv setting value and the frame of last time in perform control the difference of Sv value become larger, the exposure based on control ISO sensitivity Sv is followed
The extended line followed from the exposure of f-number Av deviates.In addition, due to camera pose variation or subject movement and make by
In the case where taking the photograph body brightness (Bv) variation, the absolute value (Sv variable quantity) for being easy to produce " this frame Sv- previous frame Sv " is more than that exposure becomes
The case where change amount clamp value (S17: "Yes").
In the case that judgement result in step S17 is "Yes", by Sv variable quantity clamper in exposure variations amount clamp value.
That is, being set as Sv (this frame Sv)=previous frame Sv+ exposure variations amount clamp value (S19).Judgement result in step S17 is Sv value
Change greatly in the case where, the exposure based on ISO sensitivity Sv follow can the extended line that be followed from the exposure of f-number Av it is inclined
From, so, the variation of Sv value is located on the extended line that exposure is followed.Here calculated Sv (this frame Sv) is sent to shutter speed
Degree/sensitivity operation control part 14 carries out the control of ISO sensitivity in imaging control part 15.In addition, being to increase direction in Sv
In the case where, it is calculated using formula documented by step S19, still, in the case where Sv is to reduce direction, utilizes Sv=
Previous frame Sv- exposure variations amount clamp value calculates Sv (this frame Sv).
In addition, in the case where being judged to being exposed using Sv in step s 11 and following, at the time of with (b) of Fig. 2
Before at the time of T2 is suitable, it is exposed and is followed (referring to S5~S9 of Fig. 3), when process and moment by changing f-number Av
After at the time of T2 is suitable, it is exposed and is followed using the Sv value being clamped in Sv value calculated in step S15 or step S19
(referring to S13~S19 of Fig. 4).
On the other hand, judgement result in step s 11 is in the case where not utilizing Sv to be exposed and follow, into utilization
Tv is exposed the processing followed, fixed aperture value Av and ISO sensitivity Sv (S21).
Then, Tv setting value (S23) is calculated by Tv=Bv+Sv-Av.Since Av and Sv are fixed, so, exposure settings value
Operational part 12 is calculated as the Tv of correct exposure amount according to these values.The calculated Tv value is sent to shutter speed/photosensitive
Operation control part 14 is spent, the control of electronic shutter speed is carried out in imaging control part 15.
After calculating Tv setting value, it is determined that the absolute value (Tv variable quantity) of " this frame Tv (Tv setting value)-previous frame Tv "
Whether be exposure variations amount clamp value (S3) corresponding with the driving speed of the aperture of lens barrel 20 or more exposure variations amount
(S25).As described above, indicating controlling value in exposure is followed according to each reading frame from imaging pixels 16, changing exposure
Amount is controlled in the range of multiple frames before becoming correct exposure amount.In this step, the Tv in this frame
In the biggish situation of difference of Tv value in the frame of value and last time, determined to prevent the exposure based on control Tv from following from aperture
The extended line that the exposure of value Av is followed deviates.
In the case that judgement result in step s 25 is "Yes", by Tv variable quantity clamper in exposure variations amount clamp value.
That is, being set as Tv (this frame Tv)=previous frame Tv+ exposure variations amount clamp value (S27).Judgement result in step S25 is Tv value
It changing greatly, the exposure based on electronic shutter speed Tv is followed the extended line followed from the exposure of f-number Av and is deviateed, so, make Tv
The variation of value is located on the extended line that exposure is followed.Here calculated Tv (modern frame Tv) is sent to shutter speed/photosensitive
Operation control part 14 is spent, the control of electronic shutter speed is carried out in imaging control part 15.In addition, the case where Tv is to increase direction
Under, it is calculated using formula documented by step S27, still, in the case where Tv is to reduce direction, is utilized Tv (this frame Tv)
=previous frame Tv- exposure variations amount clamp value calculates Tv.
It follows in addition, being judged to not utilizing Sv to be exposed in step s 11, using Tv be exposed the case where following
Under, at the time of T2 is suitable at the time of with (b) of Fig. 2 before, followed by changing f-number Av being exposed (referring to scheming
3 S5~S9), after at the time of suitable with moment T2, utilize quilt in Tv value calculated in step S23 or step S27
The Tv value of clamper, which is exposed, follows (referring to S21~S27 of Fig. 4).
Judgement result after carrying out the processing in step S19 or in step S17 for "No" or carries out in step S27
Judgement result after processing or in step S25 terminates the stream in Fig. 3 and Fig. 4 for "No" or after carrying out processing in step S9
Journey.After reading the picture element signal of 1 frame, handled from step S1 again.
As described above, in an embodiment of the invention, in subject brightness change, in order to remain suitable
In the case that light exposure changes f-number, (referring for example to Fig. 3 after driving aperture changes and is open and has adjusted light exposure
S5~S9), the magnifying power of picture element signal is changed according to the variation of the opening of aperture or electronic shutter speed adjusts light exposure
((b), Fig. 4 referring for example to Fig. 2).Therefore, it can prevent from generating flashing in image.
It, can be by ISO sensitivity and electronic shutter speed selectively in addition, in an embodiment of the invention
It is exposed and follows, but not limited to this, can also be only exposed and be followed by either side.
Also, in the embodiments of the present invention, if exposure settings value operational part 12, f-number receiving and transmitting part 13, shutter
Speed/sensitivity operation control part 14 is the internal structure of control unit 11, still, with what is executed in the form of software by CPU
Part and the part being made of hardware, however, it is possible to all be made of hardware, also, can certainly hold in the form of software
Row.
Also, it in the present embodiment, is illustrated as equipment for shooting using digital camera, still, is made
For camera, can be digital single-lens reflex camera, be also possible to small digital camera, can also be video camera, video camera this
The camera of the dynamic image of sample, in turn, can also be built in portable phone, smart phone, portable information terminal (PDA:
Personal Digital Assist), personal computer (PC), Tablet PC, the camera in game station etc..Appoint
In the case of meaning, as long as be able to use the equipment for shooting that aperture is exposed control, then it can be using the present invention.
Also, the control mainly illustrated using flow chart in the technology illustrated in this manual is closed, in most cases can
It is enough set using program, is also accommodated in recording medium or record portion sometimes.About being recorded in the recording medium, record portion
In recording method, can be recorded in product export, also can use the recording medium of publication, can also be via because of spy
Net is downloaded.
Also, about the motion flow in claims, the description and the appended drawings, use for simplicity " first ", " connect
" etc. the word of performances sequence be illustrated, at the position being not particularly illustrated, it is not necessary to be carried out according to the sequence real
It applies.
The present invention is not limited to the above embodiments, can want within the scope of its spirit to structure in implementation phase
Element is deformed and is embodied.Also, it, being capable of shape by the appropriately combined of multiple structural elements disclosed in above embodiment
At various inventions.For example, it is also possible to delete several structural elements in entire infrastructure element shown in embodiment.In turn,
It can be with the structural element in appropriately combined different embodiments.
Claims (8)
1. a kind of photographic device, includes
Photographing element images the object light for passing through photographic optical system and generates picture element signal；
Aperture limits the light beam for passing through above-mentioned photographic optical system；
Amplifying unit amplifies the picture element signal that above-mentioned photographing element generates with defined magnifying power；And
Control unit changes the opening of said aperture and the magnifying power of above-mentioned amplifying unit, to based on by above-mentioned photographing element
The light exposure of the image data of the picture element signal of generation is adjusted,
Wherein, above-mentioned control unit is in driving said aperture, change opening and after having adjusted light exposure, according to said aperture
The variation of opening changes the magnifying power of above-mentioned amplifying unit when adjusting light exposure, to change the magnifying power of above-mentioned amplifying unit, makes
Become and the consistent variation of exposure speed of variation of exposure speed corresponding with the variation of the opening of said aperture.
2. photographic device according to claim 1, wherein
Above-mentioned control unit is when driving said aperture changes opening, in the case where reaching the limit of opening, changes above-mentioned
The magnifying power of amplifying unit adjusts light exposure.
3. a kind of photographic device, includes
Photographing element images the object light for passing through photographic optical system and generates picture element signal；
Aperture limits the light beam for passing through above-mentioned photographic optical system；
Electronic shutter speed setup unit sets the electronic shutter speed of above-mentioned photographing element；And
Control unit changes the opening of said aperture and the electronic shutter speed of above-mentioned electronic shutter speed setup unit, right
The light exposure of image data based on the picture element signal generated by above-mentioned photographing element is adjusted,
Wherein, above-mentioned control unit is in driving said aperture, change opening and after having adjusted light exposure, according to by said aperture
Opening variation caused by variation of exposure change the electronic shutter speed of above-mentioned electronic shutter speed setup unit to adjust
When light exposure, change the electronic shutter speed of above-mentioned electronic shutter speed setup unit, is opened so that becoming with said aperture
The consistent variation of exposure speed of the corresponding variation of exposure speed of variation of mouth.
4. photographic device according to claim 3, wherein
Above-mentioned control unit is when driving said aperture changes opening, in the case where reaching the limit of opening, changes above-mentioned
The electronic shutter speed of electronic shutter speed setup unit adjusts light exposure.
5. the image capture method in a kind of photographic device, which includes photographing element, to across photographic optical system
Object light is imaged and generates picture element signal；And aperture, the light beam for passing through above-mentioned photographic optical system is limited
System,
The image capture method includes the following steps:
Amplify the picture element signal that above-mentioned photographing element generates with defined magnifying power,
It is carried out with above-mentioned magnifying power based on the picture element signal generated by above-mentioned photographing element in the opening for changing said aperture
When the adjusting of the light exposure of image data, in driving said aperture, change opening and after having adjusted light exposure, according to above-mentioned light
The variation of the opening of circle changes above-mentioned magnifying power when adjusting light exposure, to change the electronics of above-mentioned electronic shutter speed setup unit
Shutter speed, so that becoming and the consistent variation of exposure of variation of exposure speed corresponding with the variation of the opening of said aperture
Speed.
6. image capture method according to claim 5, wherein
When driving said aperture changes opening, in the case where reaching the limit of opening, change above-mentioned magnifying power to adjust
Light exposure.
7. the image capture method in a kind of photographic device, which includes photographing element, to across photographic optical system
Object light is imaged and generates picture element signal；And aperture, the light beam for passing through above-mentioned photographic optical system is limited
System,
The image capture method includes the following steps:
The electronic shutter speed of above-mentioned photographing element is set,
It is carried out with above-mentioned electronic shutter speed based on the pixel generated by above-mentioned photographing element in the opening for changing said aperture
When the adjusting of the light exposure of the image data of signal, in driving said aperture, change opening and after having adjusted light exposure, in basis
Variation of exposure caused by variation by the opening of said aperture changes above-mentioned electronic shutter speed to change when adjusting light exposure
Above-mentioned electronic shutter speed, so that becoming and the consistent exposure of variation of exposure speed corresponding with the variation of the opening of said aperture
Light quantity pace of change.
8. image capture method according to claim 7, wherein
When driving said aperture changes opening, in the case where reaching the limit of opening, change above-mentioned electronic shutter speed
To adjust light exposure.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2015-064573 | 2015-03-26 | ||
| JP2015064573A JP6556480B2 (en) | 2015-03-26 | 2015-03-26 | Imaging apparatus and imaging method |
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| JP6580111B2 (en) * | 2017-02-10 | 2019-09-25 | キヤノン株式会社 | Imaging device and imaging apparatus |
| US11044411B2 (en) * | 2017-02-10 | 2021-06-22 | Canon Kabushiki Kaisha | Imaging element and imaging apparatus |
| CN108521864B (en) | 2017-10-20 | 2021-01-05 | 深圳市大疆创新科技有限公司 | Imaging control method, imaging device and unmanned aerial vehicle |
| CN111758069B (en) * | 2018-02-20 | 2021-11-02 | 富士胶片株式会社 | Aperture control device and method, interchangeable lens, camera body, and recording medium |
| EP3934236A4 (en) * | 2019-03-29 | 2022-04-27 | Sony Group Corporation | Signal processing device, imaging device, and signal processing method |
| CN110139042B (en) | 2019-04-18 | 2020-08-04 | 浙江大华技术股份有限公司 | Aperture adjusting method and device, storage medium and monitoring device |
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| JPH07284008A (en) * | 1994-04-08 | 1995-10-27 | Hitachi Ltd | Image pickup device |
| CN1534371A (en) * | 1994-04-08 | 2004-10-06 | ������������ʽ���� | Camera apparatus and controlling method thereof |
| CN1577034A (en) * | 2003-07-24 | 2005-02-09 | 索尼株式会社 | Exposure control method for photographic apparatus |
| CN1602623A (en) * | 2002-10-04 | 2005-03-30 | 索尼株式会社 | Digital camera |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2015019161A (en) * | 2013-07-09 | 2015-01-29 | キヤノン株式会社 | Imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07284008A (en) * | 1994-04-08 | 1995-10-27 | Hitachi Ltd | Image pickup device |
| CN1534371A (en) * | 1994-04-08 | 2004-10-06 | ������������ʽ���� | Camera apparatus and controlling method thereof |
| CN1602623A (en) * | 2002-10-04 | 2005-03-30 | 索尼株式会社 | Digital camera |
| CN1577034A (en) * | 2003-07-24 | 2005-02-09 | 索尼株式会社 | Exposure control method for photographic apparatus |
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| JP2016184874A (en) | 2016-10-20 |
| JP6556480B2 (en) | 2019-08-07 |
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