CN1520163A - Digital camera - Google Patents
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- CN1520163A CN1520163A CNA2004100003754A CN200410000375A CN1520163A CN 1520163 A CN1520163 A CN 1520163A CN A2004100003754 A CNA2004100003754 A CN A2004100003754A CN 200410000375 A CN200410000375 A CN 200410000375A CN 1520163 A CN1520163 A CN 1520163A
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Abstract
In a first exposure condition calculating operation, proper exposure conditions in imaging are calculated by the imaging element including the effective exposure time and ISO sensitivity without preliminary light emission from the strobo part. In a second exposure condition calculating operation, the exposure condition is determined by compensating at least the ISO sensitivity among the exposure conditions calculated in the first exposure condition calculating operation by dimmer or light control operation with preliminary light emission of the strobo part. Exposure of the imaging element is executed as a regular imaging operation under the exposure condition calculated and determined in the second exposure condition calculating operation.
Description
Technical field
The present invention relates to a kind of digital camera of luminous photoflash lamp continuously that has.
Background technology
Patent documentation 1: No. 3348799 communique of patent
In recent years, because popularizing of personal computer replaces silver film, by taking the light image of subject with solid-state imagers such as CCD, the digital camera that can directly obtain the electronic data of image is extensively popularized.
In this digital camera, because solid-state imager is compared with silver film, photography width (dynamic range) is narrow, and by regulating the Amplifier Gain that the electric signal of the image that obtained by solid-state imager is amplified, therefore can easily carry out the photosensitivity adjustment, expect to have and comprise the more accurately exposure control of Amplifier Gain in being adjusted at.
Yet a kind of camera is arranged, when carrying out photoflash photography, before the operation of corresponding release-push is formally photographed, make photoflash lamp prepare luminous (hereinafter referred to as " luminous in advance "),, judge whether the luminous quantity of photoflash lamp is abundant by detecting reflection light quantity from subject, be judged as when insufficient, change and set (improving the camera photosensitive degree) above-mentioned Amplifier Gain,, make the luminous formal photography of photoflash lamp to remedy the deficiency of luminous quantity.
Aforesaid operations carries out for the correct exposure value (lightness of photographs) that obtains being attended by the luminous photography of photoflash lamp, when improving camera photosensitive as described above and spending, its camera photosensitive degree is the situation of handling the exposure value that is determined by AE (automatic exposure) to be made decision giving no thought to.
That is, when improving Amplifier Gain, can make the exposure value of main subject for being fit to according to the exposure value of the main subject in the nearer photoflash photography scope of camera distance.But the background parts in the scope that can not arrive flash light then is set to the over-exposed side of deflection.
In addition, proposed that Amplifier Gain and photoflash lamp luminous quantity are associated and exposed the technology (for example, with reference to patent documentation 1) of control.
But, as described in the 0030th section of this technical literature, Amplifier Gain only is automatically to improve predefined " ormal weight " or user to set by manual operation, and the corresponding suitable gain of exposure value of the background parts that can not automatic setting can not arrive with flash light.
As mentioned above, obtaining from the reverberation of main subject by photoflash lamp pre-luminous and calculating on the basis of proper exposure, consider the background parts that flash light can not arrive, the product of integral image being photographed with suitable exposure does not still exist yet.
Summary of the invention
The present invention is exactly In view of the foregoing and proposes, and its purpose is to provide a kind of digital camera, can calculate and set the exposure value that is suitable for main subject and is positioned at the background both sides of the scope that flash light can not arrive automatically, carries out photoflash photography.
In order to achieve the above object, the invention provides a kind of digital camera, have: imaging apparatus is used to obtain the opto-electronic conversion corresponding with the picture of the subject of imaging on the shooting face of oneself and exports; The time for exposure control unit is used to control effective exposure time of this imaging apparatus; Photosensitivity is adjusted functional unit, regulates the ISO sensitivity value of the magnification ratio corresponding camera of exporting with the opto-electronic conversion of above-mentioned imaging apparatus; And strobe light unit, be used for to above-mentioned subject projection light, it is characterized in that, main control unit with following each action of centralized control, that is, the 1st conditions of exposure is calculated action: calculate the preparation of not following above-mentioned strobe light unit luminous, comprise above-mentioned effective exposure time and ISO sensitivity value make a video recording by above-mentioned imaging apparatus the time the proper exposure condition; The 2nd conditions of exposure is calculated action: by the luminous light modulation of the preparation of following above-mentioned strobe light unit action, the above-mentioned at least ISO sensitivity value of being calculated by above-mentioned the 1st conditions of exposure in the conditions of exposure that action calculates is proofreaied and correct, calculated this conditions of exposure; And following action:, carry out exposure as the above-mentioned imaging apparatus of original photography action according to calculate the conditions of exposure that action is calculated and determined by the 2nd conditions of exposure.
Another feature of digital camera of the present invention is, calculate action as above-mentioned the 2nd conditions of exposure, above-mentioned main control unit is to also proofreading and correct, calculate this conditions of exposure that is applicable to original photography action the effective exposure time of being calculated action by above-mentioned the 1st conditions of exposure and calculating.
Another feature of digital camera of the present invention is, above-mentioned main control unit, calculate in the action at above-mentioned the 2nd conditions of exposure, as above-mentioned effective exposure time, be provided with its value is controlled at the boundary value of regulation with interior condition, calculated for the 1st time for exposure, and, this condition is not set calculated for the 2nd time for exposure, the required regulated quantity of the 1st time for exposure of calculating and being calculated and the corresponding above-mentioned ISO sensitivity value of difference of the 2nd time for exposure, at least consider that this calculated value proofreaies and correct calculated the ISO sensitivity value that action calculates by above-mentioned the 1st conditions of exposure, decision is applicable to the conditions of exposure of original photography action.
One being characterised in that again of digital camera of the present invention, above-mentioned main control unit, calculate in the action at above-mentioned the 2nd conditions of exposure, as above-mentioned effective exposure time, be provided with its value is controlled at the boundary value of regulation with interior condition, calculated for the 1st time for exposure, and, this condition is not set calculates above-mentioned the 2nd time for exposure, calculate and the 1st time for exposure and the corresponding above-mentioned ISO sensitivity value of difference of the 2nd time for exposure and the required separately regulated quantity of above-mentioned effective exposure time calculated, at least consider that this calculated value proofreaies and correct calculated ISO sensitivity value and the above-mentioned effective exposure time that action calculates by above-mentioned the 1st conditions of exposure, calculate the conditions of exposure that is applicable to original photography action.
The present invention also provides a kind of digital camera, has: imaging apparatus is used to obtain the opto-electronic conversion corresponding with the picture of the subject of imaging on the shooting face of oneself and exports; The time for exposure control unit is used to control effective exposure time of this imaging apparatus; Photosensitivity is adjusted functional unit, regulates the ISO sensitivity value of the magnification ratio corresponding camera of exporting with the opto-electronic conversion of above-mentioned imaging apparatus; And strobe light unit, be used for to above-mentioned subject projection light, it is characterized in that, main control unit with following each action of centralized control, that is, the 1st conditions of exposure is calculated action: calculate the preparation of not following above-mentioned strobe light unit luminous, comprise above-mentioned effective exposure time and ISO sensitivity value make a video recording by above-mentioned imaging apparatus the time the proper exposure condition; The 2nd conditions of exposure is calculated action: by the luminous light modulation of the preparation of following above-mentioned strobe light unit action, the above-mentioned at least ISO sensitivity value of being calculated by above-mentioned the 1st conditions of exposure in the conditions of exposure that action calculates is proofreaied and correct, calculated this conditions of exposure; And following action: according to calculate the conditions of exposure that action is calculated and determined by the 2nd conditions of exposure, execution is as the exposure of the above-mentioned imaging apparatus of original photography action, and, above-mentioned main control unit the value of above-mentioned effective exposure time is not limited in the regulation boundary value with the 1st interior control model in, also proofread and correct calculate the effective exposure time that action calculates by above-mentioned the 1st conditions of exposure, calculate this conditions of exposure that is applicable to original photography action, the value of above-mentioned effective exposure time is limited in the regulation boundary value with the 2nd interior control model in, be provided with the value of above-mentioned effective exposure time is controlled at the regulation boundary value with interior condition, calculated for the 1st time for exposure, this condition is not set calculated for the 2nd time for exposure, the required regulated quantity of the 1st time for exposure of calculating and being calculated and the corresponding above-mentioned ISO sensitivity value of difference of the 2nd time for exposure, at least consider that this calculated value proofreaies and correct calculated the ISO sensitivity value that action calculates by above-mentioned the 1st conditions of exposure, calculate and determine to be applicable to the conditions of exposure of original photography action.
The present invention also provides a kind of digital camera, has: imaging apparatus is used to obtain the opto-electronic conversion corresponding with the picture of the subject of imaging on the shooting face of oneself and exports; The time for exposure control unit is used to control effective exposure time of this imaging apparatus; Photosensitivity is adjusted functional unit, regulates the ISO sensitivity value of the magnification ratio corresponding camera of exporting with the opto-electronic conversion of above-mentioned imaging apparatus; And strobe light unit, be used for to above-mentioned subject projection light, it is characterized in that, main control unit with following each action of centralized control, that is, the 1st conditions of exposure is calculated action: calculate the preparation of not following above-mentioned strobe light unit luminous, comprise above-mentioned effective exposure time and ISO sensitivity value make a video recording by above-mentioned imaging apparatus the time the proper exposure condition; The 2nd conditions of exposure is calculated action: by the luminous light modulation of the preparation of following above-mentioned strobe light unit action, the above-mentioned at least ISO sensitivity value of being calculated by above-mentioned the 1st conditions of exposure in the conditions of exposure that action calculates is proofreaied and correct, calculated this conditions of exposure; And following action: according to calculate the conditions of exposure that action is calculated and determined by the 2nd conditions of exposure, execution is as the exposure of the above-mentioned imaging apparatus of original photography action, and, above-mentioned main control unit the value of above-mentioned effective exposure time is not limited in the regulation boundary value with the 1st interior control model in, also proofread and correct calculate the effective exposure time that action calculates by above-mentioned the 1st conditions of exposure, calculate this conditions of exposure that is applicable to original photography action, the value of above-mentioned effective exposure time is limited in the regulation boundary value with the 2nd interior control model in, be provided with the value of above-mentioned effective exposure time is controlled at the regulation boundary value with interior condition, calculated for the 1st time for exposure, this condition is not set calculated for the 2nd time for exposure, calculate and the 1st time for exposure and the corresponding above-mentioned ISO sensitivity value of difference of the 2nd time for exposure and the required separately regulated quantity of above-mentioned effective exposure time calculated, at least consider that this calculated value proofreaies and correct calculated ISO sensitivity value and the effective exposure time that action calculates by above-mentioned the 1st conditions of exposure, calculate and determine to be applicable to the conditions of exposure of original photography action.
Description of drawings
Fig. 1 is the block diagram of the circuit structure of the digital camera that relates to of expression the 1st execution mode of the present invention.
Fig. 2 be this execution mode of expression relate to slow synchronization settings the time the flow chart of photograph processing content.
Fig. 3 is the exemplary plot of the photographs that relates to of this execution mode of expression.
The flow chart of the photograph processing content when Fig. 4 is the hand wobble boundary light setting of the digital camera that relates to of expression the 2nd execution mode of the present invention.
Fig. 5 be this execution mode of expression relate to hand wobble boundary light setting the time the flow chart of other photograph processing contents.
Fig. 6 be this execution mode of expression relate to hand wobble boundary light setting the time the flow chart of other photograph processing contents.
Embodiment
The 1st execution mode
Below, the 1st execution mode when the present invention being applicable to digital camera with reference to description of drawings.
The structure of the 1st execution mode
Fig. 1 represents the circuit structure of the digital camera 1 that one embodiment of the present invention relates to.The lens body of this digital camera 1 of the expression of 10 among the figure is provided with lens optical system 11 and aperture 12 in this lens body 10.
After the light image that obtains by this lens body 10 sees through mechanical shutter 13, image on the shooting face as the CCD14 of solid-state imager.
As everyone knows, CCD14 is used for electric charge and the output at its each pixel of time for exposure savings, (output to imaging apparatus is sampled by the correlated double sample circuit in this output, this belongs to known content, omission is designated as CDS) 15, after being exaggerated with suitable gain via amplifier 16, be converted to digital signal by A/D change-over circuit 17, and offer image processing circuit 18.
This image processing circuit 18 is stored the picture signal of digital form for the time being and is remained in the buffer storage 19, reads and stores the picture signal that remains in this buffer storage 19, carries out the various signal processing of the regulation that comprises that pixel interpolation is handled.
After being converted into the analogue value through the picture signal after the various signal processing by D/A converter 20 like this, being provided for TFT-LCD panel 21 and monitoring demonstration with back of the body irradiation.
In addition, the picture signal that obtains at image processing circuit 18 also is provided for compression/decompression circuit 22, after according to specified compression methods such as for example JPEG data volume suitably being compressed, be recorded, be kept at the plug that is made of flash memory freely in the storage card 23, this storage card 23 is used as the recording medium of this digital camera 1.
When being kept at picture signal in this storage card 23 and when play mode, being read out, utilize compression/decompression circuit 22 and decompress by the method opposite with when record, be recovered to bitmap shape picture signal, handle the picture signal that obtains by this recovery and be stored in the buffer storage 19, be presented on the TFT-LCD panel 21 by described D/A converter 20 by image processing circuit 18.
In addition, be provided with the system controller 24 of digital camera 1 integral body that is used for this example of centralized control, the CCD driver 25 that this system controller 24 is connected with described amplifier 16, image processing circuit 18 and drives described CCD14.
In addition, system controller 24 also connects the 1st to the 3rd motor driver 26～28 and photoflash lamp control unit 29.
The 1st motor driver 26 drives and makes above-mentioned mechanical shutter 13 carry out the 1st motor (M) 30 of on-off action.
The 2nd motor driver 27 drives and makes said aperture 12 carry out the 2nd motor 31 that it regulates action.
The 3rd motor driver 28 drives the 3rd motor 32 that said lens optical system 11 is moved.
Photoflash lamp control unit 29 is according to the charging of the indication switching controls photoflash lamp luminescence unit 33 of system controller 24 and luminous.
In addition, directly import operation signal to system controller 24 from console switch (SW) unit 34, this switch-unit 34 comprises not shown mains switch, release-push, ZSW, the photoflash lamp switch, cursor switch, menu switch etc., and show and the operate condition of this operation and the recording status in said memory card 23 etc. are followed in output by operation display unit 35, this operation display unit 35 is made of the black and white type LCD panel with back of the body irradiation, and this system controller 24 is connected with the not volatile memory EEPROM36 of the control program that stores the concentrated action that is used to carry out above all circuit.In Fig. 1, with dashed lines surround expression above-mentioned CDS15, amplifier 16, and A/D change-over circuit 17 constitute photosensitivity and adjust functional unit SCU, this photosensitivity is adjusted functional unit SCU under the control of system controller 24, determines the ISO sensitivity value (aftermentioned) of the digital camera 1 of this example according to their gain.
The action of the 1st execution mode
The following describes the action of above-mentioned execution mode.
Fig. 2 represents to utilize flash light to make main subject such as personage outstanding, photograph processing content when utilizing slow shutter to take in the slow synchronous mode of background simultaneously, all controls that comprise the correction of exposure value are to carry out under at the centralized control of each relevant portion at system controller 24.
And, the release-push of aforesaid operations switch element 34 moves by two walking journeys, by the 1st stroke (following reaching in the accompanying drawing in article is called " the 1st the discharges ") operation of partly being undertaken by operation, execution does not have luminous AE of photoflash lamp (automatic exposure) and AF (focusing automatically), by the 2nd stroke of pressing fully (following reaching in the accompanying drawing in article is called " the 2nd discharges "), drive photoflash lamp luminescence unit 33 and prepare luminous (hereinafter referred to as " luminous in advance "), after the correction of carrying out exposure value, drive photoflash lamp luminescence unit 33 once more and carry out luminous (hereinafter referred to as " formally luminous "), thereby photograph.
In addition, shutter speed Tv described later, f-number Av, with yield value corresponding photographic photosensitivity (ISO photosensitivity) Sv of amplifier 16 all based on known APEX mode, for example, if shutter speed Tv is " 6 " then corresponding to " 1/60 second ", f-number Av be " 3 " then corresponding to " F2.8 ", IS0 sensitivity value Sv is that " 5 " are then corresponding to " ISO100 ".
In the beginning of this processing, wait for that release-push is carried out the 1st releasing operation (step S101), being judged as when being operated, photoflash lamp luminescence unit 33 is not carried out light emitting drive, carry out that AE handles and AF processing (step S102, S103).
At this moment, be assumed to be Tv, f-number is assumed to be Av, above-mentioned ISO photosensitivity is assumed to be Sv, then form AE locking and AF lock-out state handling the shutter speed that obtains by AE.At this AE lock-out state, also carry out whether need the luminous judgement of photoflash lamp etc., but for the ease of concise description the present invention, below only be described in detail situation when following photoflash lamp luminous.
Afterwards,, whether keeping the 1st releasing operation (step S105), keeping the resulting state of above-mentioned AE and AF, waiting pending the 2nd releasing operation by judging whether to have carried out the 2nd releasing operation (step S104) of release-push repeatedly.
Herein, remove under the situation of the 1st releasing operation not keeping the 1st releasing operation, determine this situation at step S105, will be all discarded at above-mentioned AE and the resulting shutter speed Tv of AF, f-number Av, the ISO sensitivity value Sv that reaches amplifier 16 and focusing position, return the processing that begins from above-mentioned steps S101 once more.
In addition, when release-push has been carried out the 2nd releasing operation, determine this situation at step S104, drive luminous luminous in advance of photoflash lamp luminescence unit 33 at once, the reverberation that forms thus by CCD14 sensitization simultaneously from subject, and detect its level (step S106), whether the luminous quantity of judging photoflash lamp luminescence unit 33 according to the level that is detected not enough (step S107).
In this case, when pre-luminous reverberation is followed in detection, also can judge the sensitization level of the shooting face integral body of CCD14 without exception, can also only be weighted to central portion or to the regulation multiple spot position that comprises central portion, by with the relatively judgement of pre-set threshold, carry out the judgement of sensitization level.
In above-mentioned judgement, if obtain the conclusion of luminous quantity abundance, then without any problem, if but be judged as the luminous quantity deficiency, then, improve the ISO sensitivity value by the yield value that increases amplifier 16 to should level error.If the increase of this moment partly is Δ Sv, set the correction value delta Tv of the shutter speed value Tv that makes Δ Sv=Δ Tv.
Then, above-mentioned Δ Sv is added on the ISO sensitivity value Sv that supposes among the above-mentioned steps S102, again carry out calibration setup (Sv ← Sv+ Δ Sv) with it with as ISO sensitivity value Sv, simultaneously above-mentioned Δ Tv is added on the shutter speed Tv that supposes among the above-mentioned steps S102, carries out calibration setup (Tv ← Tv+ Δ Tv) (step S108) again with it with as shutter speed Tv.
Then, according to the focusing position, shutter speed Tv, f-number Av and the ISO sensitivity value Sv that set this moment, carry out making photoflash lamp luminescence unit 33 carry out formal luminous photography (step S109).
Then, the photography acquired image data is sent to compression/decompression circuit 22 from imaging signal processing circuit 18, after data volume compressed, record also is kept at (step S110) in the storage card 23, finish a series of processing that above slow synchronous shooting relates to, return the processing that begins from above-mentioned steps S101 in order to prepare next release-push operation.
Fig. 3 represents the example of the image I that the processing of process above-mentioned steps S108 is photographed.Herein, in order to make main subject M be positioned at the position of comparison near digital camera 10, according to the pre-luminous content that detects by photoflash lamp, improve ISO sensitivity value Sv, photograph with suitable exposure, on the other hand, the background parts B that can not arrive at flash light, shutter speed is only accelerated the raising part of this ISO sensitivity value Sv, so can photograph with suitable exposure and can be not over-exposed.
Like this, be judged as luminous quantity according to photoflash lamp luminescence unit 33 pre-luminous when not enough, in order to obtain the proper exposure of main subject, the exposure value that obtains when not luminous with photoflash lamp luminescence unit 33 is a benchmark, carries out calibration setup and makes ISO sensitivity value Sv only improve suitable necessary horizontal component.
Thus, main subject is photographed by the formal luminous of photoflash lamp luminescence unit 33 with reliable suitable exposure value.
In addition, establish the poor Δ Sv=Δ Tv after the ISO sensitivity value Sv raising, Tv is added on the shutter speed Tv this value Δ, carries out calibration setup again with it with as shutter speed Tv.
Like this, only improve corresponding ISO sensitivity value Sv rising part, shorten the time for exposure, can reliably prevent the over-exposed of background parts that flash light can not arrive by making shutter speed.
In addition, the fluorescent lifetime of photoflash lamp generally is about 5msec (=1/200 second), so in order to utilize the time for exposure to guarantee the fluorescent lifetime of above-mentioned photoflash lamp, also can set restriction to the poor Δ Sv that improves above-mentioned ISO sensitivity value Sv.
In this case, the fluorescent lifetime TvLIMIT=7.64 (being equivalent to 5msec) of this photoflash lamp when " Δ Sv＞TvLIMIT-Tv ", for example, also can be used as " Δ Sv=TvLIMIT-Tv ", the value of restriction Δ Sv.
The 2nd execution mode
Below, the 2nd execution mode when the present invention being applicable to digital camera with reference to description of drawings.
Because its block diagram structure is identical with above-mentioned structure shown in Figure 1 basically, thus give same numeral to same section, and omit its diagram and explanation.
The action of the 2nd execution mode
The following describes the action of above-mentioned execution mode.
Main subject is outstanding photographs for the personages that Fig. 4 represents to be intended to utilize flash light to make and closely locates relatively etc., is 1/30 second (Tv=5) during the wide-angle side for example, is the flow chart of the photography action of 1/125 second (Tv=7) automatic light-emitting mode when exposing control as the hand wobble boundary when looking in the distance side with shutter speed.So-called " shutter speed of hand wobble boundary ", but be meant in image, do not produce as the photography result observer's visual identification rock, as the shutter speed of low speed side boundary value, be generally understood as corresponding to the inverse of the lens focus of using in this photography apart from (mm).Carry out exposure control in the present embodiment, proofread and correct with the exposure value of the shutter speed (following table is shown Tv (hand wobble)) of having considered this hand wobble boundary.All controls that comprise this exposure control are by being that main body is carried out centralized control to control system and carried out with system controller 24.
In addition, the release-push of aforesaid operations switch element 34 moves by 2 walking journeys, there are not luminous AE of photoflash lamp (automatic exposure) and AF (focusing automatically) by the execution of the 1st releasing operation, it is luminous in advance by the 2nd releasing operation photoflash lamp luminescence unit 33 to be carried out, after the correction of carrying out exposure value, drive 33 luminous once more (hereinafter referred to as " formally luminous ") of photoflash lamp luminescence unit, thereby carry out photography.
In the beginning of this processing, wait for that release-push is carried out the 1st releasing operation (step S201), being judged as when being operated, photoflash lamp luminescence unit 33 is not carried out light emitting drive, carry out that AE handles and AF processing (step S202, S203).
At this moment, be assumed to be Tv, f-number is assumed to be Av, the ISO sensitivity value is assumed to be Sv, then form AE locking and AF lock-out state handling the shutter speed that obtains by AE.In this AE locking, also carry out whether need the luminous judgement of photoflash lamp etc.The initial stage of the AE calculation process when photography, as shutter speed Tv, when the shutter speed TvSTOFF that calculates than shutter speed Tv (hand wobble) low speed of above-mentioned hand wobble boundary, in the present embodiment, be judged to be the automatic luminous action of photoflash lamp in the time of should carrying out low-light level, the shutter speed of actual set is restricted to Tv (hand wobble).When supposing to have carried out photography with above-mentioned low speed shutter speed TvSTOFF, the background parts that flash light can not arrive is suitable exposure.On the other hand, make photoflash lamp luminous, when having carried out photography with shutter speed Tv (hand wobble), the main subjects such as the personage who closely locates relatively that flash light can arrive can access suitable exposure, and the background parts that flash light can not arrive presents the tendency of the part that is restricted to Tv (hand wobble) with shutter speed not being made as low speed shutter speed TvSTOFF corresponding under-exposed (so-called under-exposed).
After having selected shutter speed as mentioned above, by judging whether to have carried out the 2nd releasing operation (step S204) of release-push repeatedly, whether keep the 1st releasing operation (step S205), keeping the resulting state of above-mentioned AE and AF, waiting pending the 2nd releasing operation.
Herein, remove under the situation of the 1st releasing operation not keeping the 1st releasing operation, determine this situation at step S205, will above-mentioned AE and the resulting focusing position of AF, shutter speed Tv, f-number Av, and ISO sensitivity value Sv all discarded, return the processing that begins from above-mentioned steps S201 once more.
In addition, when release-push has been carried out the 2nd releasing operation, determine this situation at step S204, drive luminous luminous in advance of photoflash lamp luminescence unit 33 at once, the reverberation that forms thus by CCD14 sensitization simultaneously from subject, and detect its level (step S206), whether the luminous quantity of judging photoflash lamp luminescence unit 33 according to the level that is detected not enough (step S207).
In this case, when pre-luminous reverberation is followed in detection, can judge the sensitization level of the shooting face integral body of CCD14 without exception, also can only be weighted to central portion or to the regulation multiple spot position that comprises central portion, by with the relatively judgement of pre-set threshold, carry out the judgement of sensitization level.
In the present embodiment, directly photosensitivity is not improved the corresponding value of increase part that is adjusted to the ISO sensitivity value, but suppressing the ISO sensitivity value to a certain extent, the lightness of considering background increases, carry out the adjusting that photosensitivity improves, the increase of this ISO sensitivity value partly be as with calculate by the luminous corresponding part of deficiency in light quantity part that can not fill up of photoflash lamp.Like this, can carry out the proper exposure control that background parts in the scope that flash light can not arrive can be not over-exposed.
Carry out computing " Tv (hand wobble)-TvSTOFF ", judge consequently not less than the poor Δ Sv (step S208) that increases the ISO sensitivity value.
Herein, when being judged as less than this difference Δ Sv, the result of above-mentioned computing " Tv (hand wobble)-TvSTOFF " is carried out more new settings (Δ Sv ← Tv (hand wobble)-TvSTOFF) again as the poor Δ Sv that increases the ISO sensitivity value, utilize this more the Δ Sv behind the new settings this Δ Sv is added on the ISO sensitivity value Sv of above-mentioned steps S202 hypothesis, carry out calibration setup (Sv ← Sv+ Δ Sv) (step S209) again with it with as ISO sensitivity value Sv.
In addition, at above-mentioned steps S208, when the result who is judged as computing " Tv (hand wobble)-TvSTOFF " is equal to or greater than the poor Δ Sv that increases the ISO sensitivity value, use above-mentioned poor Δ Sv directly above-mentioned Δ Sv to be added on the ISO sensitivity value Sv of above-mentioned steps S203 hypothesis, carry out calibration setup (Sv ← Sv+ Δ Sv) (step S210) again with it with as ISO sensitivity value Sv.
Then, according to the focusing position, shutter speed Tv, f-number Av and the ISO sensitivity value Sv that set this moment, carry out making the 33 formal luminous photographies (step S211) of photoflash lamp luminescence unit.
Then, the photography acquired image data is sent to compression/decompression circuit 22 from image processing circuit 18, after data volume compressed, record also is kept at (step S212) in the storage card 23, considered a series of processing of photoflash lamp light-emitting mode of the shutter speed of hand wobble boundary more than the end, returned the processing that begins from above-mentioned steps S201 in order to prepare next release-push operation.
As mentioned above in the present embodiment, directly photosensitivity is not improved the corresponding value of increase part that is adjusted to the ISO sensitivity value, but suppressing the ISO sensitivity value to a certain extent, the lightness of considering background on one side increases, the adjusting that on one side improves photosensitivity, the increase of this ISO sensitivity value partly be as with calculate by the luminous corresponding part of deficiency in light quantity part that can not fill up of photoflash lamp.Like this, can carry out the proper exposure control that background parts in the scope that flash light can not arrive can be not over-exposed.
In addition, when reliably preventing the rocking of hand, the lightness of the background parts during according to photoflash photography can obtain finer proper exposure.
Other actions 1 of the 2nd execution mode
The following describes other actions of above-mentioned execution mode.
Main subject is outstanding photographs for the personages that Fig. 5 represents to be intended to utilize flash light to make and closely locates relatively etc., is 1/30 second (Tv=5) during the wide-angle side for example, is the flow chart of the photography action of 1/125 second (Tv=7) automatic light-emitting mode when exposing control as the hand wobble boundary when looking in the distance side with shutter speed.So-called " shutter speed of hand wobble boundary " comprises that all controls that the exposure value of the shutter speed (following table is shown Tv (hand wobble)) of having considered this hand wobble boundary proofreaies and correct are by being that main body is carried out centralized control to control system and carried out with system controller 24 as previously described.
And, the release-push of aforesaid operations switch element 34 moves by 2 walking journeys, there are not luminous AE of photoflash lamp (automatic exposure) and AF (focusing automatically) by the execution of the 1st releasing operation, undertaken luminous in advance by the 2nd releasing operation, after the correction of carrying out exposure value, drive 33 luminous once more (hereinafter referred to as " formally luminous ") of photoflash lamp luminescence unit, thereby carry out photography.
In the beginning of this processing, wait for that release-push is carried out the 1st releasing operation (step S301), being judged as when being operated, photoflash lamp luminescence unit 33 is not carried out light emitting drive, carry out that AE handles and AF processing (step S302, S303).
At this moment, be assumed to be Tv, f-number is assumed to be Av, above-mentioned ISO sensitivity value is assumed to be Sv, then form AE locking and AF lock-out state handling the shutter speed that obtains by AE.In this AE locking, also carry out whether need the luminous judgement of photoflash lamp etc.The initial stage of the AE calculation process when photography, as shutter speed Tv, when the shutter speed TvSTOFF that calculates than shutter speed Tv (hand wobble) low speed of above-mentioned hand wobble boundary, in the present embodiment, be judged to be the automatic luminous action of photoflash lamp in the time of should carrying out low-light level, the shutter speed of actual set is restricted to Tv (hand wobble).When supposing to have carried out photography with above-mentioned low speed shutter speed TvSTOFF, the background parts that flash light can not arrive is suitable exposure.On the other hand, make photoflash lamp luminous, when having carried out photography with shutter speed Tv (hand wobble), the main subjects such as the personage who closely locates relatively that flash light can arrive can access suitable exposure, and the background parts that flash light can not arrive presents the tendency of the part that is restricted to Tv (hand wobble) with shutter speed not being made as low speed shutter speed TvSTOFF corresponding under-exposed (so-called under-exposed).
Then,, whether keeping the 1st releasing operation (step S305), when keeping the resulting state of above-mentioned AE and AF, waiting pending the 2nd releasing operation by judging whether to have carried out the 2nd releasing operation (step S304) of release-push repeatedly.
Herein, remove under the situation of the 1st releasing operation not keeping the 1st releasing operation, determine this situation at step S305, will above-mentioned AE and the resulting focusing position of AF, shutter speed Tv, f-number Av, and ISO sensitivity value Sv all discarded, return the processing that begins from above-mentioned steps S301 once more.
When release-push has been carried out the 2nd releasing operation, determine this situation at step S304, when driving luminous pre-luminous of photoflash lamp luminescence unit 33 at once, the reverberation that forms thus by CCD14 sensitization from subject, detect its level (step S306), whether the luminous quantity of judging photoflash lamp luminescence unit 33 according to the level that is detected not enough (step S307).
In this case, when pre-luminous reverberation is followed in detection, can judge the sensitization level of the shooting face integral body of CCD14 without exception, also can only be weighted to central portion or to the regulation multiple spot position that comprises central portion, by with the relatively judgement of pre-set threshold, carry out the judgement of sensitization level.
Yet, when being judged as the luminous quantity abundance according to this testing result,, but when being judged as the luminous quantity deficiency, then judge its not enough degree without any problem.
Carry out computing " Tv (hand wobble)-TvSTOFF ", judge consequently not less than the poor Δ Sv (step S308) that increases the ISO sensitivity value.
Herein, when being judged as less than this difference Δ Sv, use above-mentioned poor Δ Sv directly above-mentioned Δ Sv to be added on the ISO sensitivity value Sv of above-mentioned steps S302 hypothesis, again carry out calibration setup (Sv ← Sv+ Δ Sv) with it with as ISO sensitivity value Sv, above-mentioned poor Δ Sv and photoflash lamp luminescence unit 33 are not had shutter speed TvSTOFF addition when luminous, carry out calibration setup (Tv ← Δ Sv+TvSTOFF) (step S309) again with it with as shutter speed Tv.
The computing of this shutter speed Tv is actually as " Tv (hand wobble)+Δ Sv-(Tv (hand wobble)-TvSTOFF) ", by what the 1st of this formula and the 3rd 's Tv separately (hand wobble) counteracting was derived.
But, when as the poor Δ Sv of the increase ISO sensitivity value Sv of the judgment standard of above-mentioned steps S308 greater than computing " TvLIMIT-TvSTOFF " (TvLIMIT: flash light-emitting time=7.64 (being equivalent to 5msec)) as a result the time, because shutter speed might be subjected to the influence of flash light-emitting time, so replace the processing of above-mentioned steps S309 for design limit, also can carry out more new settings to the result of " TvLIMIT-TvSTOFF " again as difference Δ Sv, then above-mentioned Δ Sv is added on the ISO sensitivity value Sv of above-mentioned steps S302 hypothesis, again carry out calibration setup (Sv ← Sv+ Δ Sv) with it with as ISO sensitivity value Sv, simultaneously shutter speed Tv is carried out calibration setup ((the step S309 of Tv ← TvLIMIT) as above-mentioned TvLIMIT ... in the flow chart of Fig. 5, carry out, to replace step S309).
In addition, at above-mentioned steps S308, when the result of computing " TvLIMIT-TvSTOFF " is equal to or greater than the poor Δ Sv that increases ISO sensitivity value Sv, use above-mentioned poor Δ Sv directly to the above-mentioned Δ Sv that adds of the yield value Sv at the amplifier 16 of above-mentioned steps S303 hypothesis, carry out calibration setup (Sv ← Sv+ Δ Sv) (step S310) again with it with as the yield value Sv of amplifier 16.
Then, according to the focusing position, shutter speed Tv, f-number Av and the ISO sensitivity value Sv that set this moment, carry out making the 33 formal luminous photographies (step S311) of photoflash lamp luminescence unit.
Then, the photography acquired image data is sent to compression/decompression circuit 22 from imaging signal processing circuit 18, after data volume compressed, record also is kept at (step S312) in the storage card 23, considered a series of processing of photoflash lamp light-emitting mode of the shutter speed of hand wobble boundary more than the end, returned the processing that begins from above-mentioned steps S301 in order to prepare next release-push operation.
As mentioned above in the present embodiment, directly photosensitivity is not improved the corresponding value of increase part that is adjusted to the ISO sensitivity value, but suppressing the ISO sensitivity value to a certain extent, the lightness of considering background increases, carry out the adjusting that the sensitivity photosensitivity improves, the increase of this ISO sensitivity value partly be as with calculate by the luminous corresponding part of deficiency in light quantity part that can not fill up of photoflash lamp.Like this, can carry out the proper exposure control that the background parts exposure of the scope that flash light can not arrive can be inexcessive.
In addition,, make by above-mentioned the 1st execution mode describedly, carry out the calibration setup of shutter speed Tv as required the poor Δ Sv that increases the ISO sensitivity value system of not limiting.
Other actions 2 of the 2nd execution mode
The following describes other actions of above-mentioned execution mode.
Main subject is outstanding photographs for the personages that Fig. 6 represents to be intended to utilize flash light to make and closely locates relatively etc., is 1/30 second (Tv=5) during the wide-angle side for example, is the flow chart of the photography action of 1/125 second (Tv=7) automatic light-emitting mode when exposing control as the hand wobble boundary when looking in the distance side with shutter speed.As previously described, so-called " shutter speed of hand wobble boundary " but be meant in image, do not produce as the photography result observer's visual identification rock, as the shutter speed of low speed side boundary value, the lens focus that being generally understood as adapts uses in this photography is apart from the inverse of (mm).In the present embodiment, comprise that all controls that the exposure value of the shutter speed (following table is shown Tv (hand wobble)) of having considered this hand wobble boundary proofreaies and correct are by being that main body is carried out centralized control to control system and carried out with system controller 24.
In addition, the release-push of aforesaid operations switch element 34 moves by 2 walking journeys, there are not luminous AE of photoflash lamp (automatic exposure) and AF (focusing automatically) by above-mentioned the 1st releasing operation execution, it is luminous in advance by above-mentioned the 2nd releasing operation photoflash lamp luminescence unit 33 to be carried out, after the correction of carrying out exposure value, make photoflash lamp luminescence unit 33 formal luminous and photograph.
In the beginning of this processing, wait for that release-push is carried out the 1st releasing operation (step S401), being judged as when being operated, photoflash lamp luminescence unit 33 is not carried out light emitting drive, carry out that AF handles and AE processing (step S402, S403).
At this moment, be made as Tv, f-number is made as Av, the ISO sensitivity value is made as Sv handling the shutter speed that obtains by AE, particularly f-number Av sets by previous status, shutter speed Tv and ISO sensitivity value then all are hypothesis, form the AE lock-out state that AF locked and comprised the ISO sensitivity value.In this embodiment, also in this AE locking, carry out whether need the luminous judgement of photoflash lamp etc.The initial stage of the AE calculation process when photography, as shutter speed Tv, when the shutter speed TvSTOFF that calculates than shutter speed Tv (hand wobble) low speed of above-mentioned hand wobble boundary, in the present embodiment, be judged to be the automatic luminous action of photoflash lamp in the time of should carrying out low-light level, the shutter speed of actual set is restricted to Tv (hand wobble).When supposing to have carried out photography with above-mentioned low speed shutter speed TvSTOFF, the background parts that flash light can not arrive becomes suitable exposure.On the other hand, make photoflash lamp luminous, when having carried out photography with shutter speed Tv (hand wobble), the personage's who closely locates relatively that flash light can arrive etc. main subject can access suitable exposure, and the background parts that flash light can not arrive presents the tendency of the part that is restricted to Tv (hand wobble) with shutter speed not being made as low speed shutter speed TvSTOFF corresponding under-exposed (so-called under-exposed).
Then,, whether keeping the 1st releasing operation (step S405), keeping the resulting state of above-mentioned AE and AF, waiting pending the 2nd releasing operation by judging whether to have carried out the 2nd releasing operation (step S404) of release-push repeatedly.
Herein, remove under the situation of the 1st releasing operation not keeping the 1st releasing operation, determine this situation at step S405, will above-mentioned AE and the resulting focusing position of AF, shutter speed Tv, f-number Av, and ISO sensitivity value Sv all discarded, return the processing that begins from above-mentioned steps S401 once more.
In addition, when release-push has been carried out the 2nd releasing operation, determine this situation at step S404, drive luminous luminous in advance of photoflash lamp luminescence unit 33 at once, the reverberation that forms thus by CCD14 sensitization simultaneously from subject, and detect its level (step S406), whether the luminous quantity of judging photoflash lamp luminescence unit 33 according to the level that is detected not enough (step 407).
In this case, when pre-luminous reverberation is followed in detection, can judge the sensitization level of the shooting face integral body of CCD14 without exception, also can only be weighted to central portion or to the regulation multiple spot position that comprises central portion, by with the relatively judgement of pre-set threshold, carry out the judgement of sensitization level.
Yet, when being judged as the luminous quantity abundance according to this testing result,, but when being judged as the luminous quantity deficiency, then judge its not enough degree without any problem.
Promptly, the shutter speed corresponding with flash light-emitting time is made as TvLIMIT (TvLIMIT=7.64 (being equivalent to 5msec)), the hand wobble boundary value of the shutter speed corresponding with the focal length of the lens optical system of selecting this moment 12 is made as Tv (hand wobble).
Calculate computing " TvLIMIT-Tv (hand wobble) " in view of the above, judge consequently not less than the poor Δ Sv (step S408) that increases the ISO sensitivity value.
When being judged as less than this difference Δ Sv, the result of above-mentioned computing " TvLIMIT-Tv (hand wobble) " is added on the ISO sensitivity value Sv of above-mentioned steps S403 hypothesis, again carry out calibration setup (Sv ← Sv+TvLIMIT-Tv (hand wobble)) with it with as the yield value Sv of amplifier 16, the shutter speed TvLIMIT of corresponding above-mentioned flash light-emitting time is carried out calibration setup (Tv ← TvLIMIT) (step S409) again as shutter speed Tv.
In addition, at above-mentioned steps S408, when the result of computing " TvLIMIT-Tv (hand wobble) " is equal to or greater than the poor Δ Sv that increases the ISO sensitivity value, use above-mentioned poor Δ Sv directly above-mentioned Δ Sv to be added on the ISO sensitivity value Sv of above-mentioned steps S403 hypothesis, again carry out calibration setup (Sv ← Sv+ Δ Sv) with it with as ISO sensitivity value Sv, simultaneously above-mentioned Δ Sv is added on the shutter speed Tv of above-mentioned steps S402 hypothesis, carries out calibration setup (Tv ← Tv+ Δ Sv) (step S410) again with it with as shutter speed Tv.
Then, according to the focusing position, shutter speed Tv, f-number Av and the ISO sensitivity value Sv that set this moment, carry out making the 33 formal luminous photographies (step S411) of photoflash lamp luminescence unit.
Then, the photography acquired image data is sent to compression/decompression circuit 22 from image processing circuit 18, after data volume compressed, record also is kept at (step S412) in the storage card 23, considered a series of processing of photoflash lamp light-emitting mode of the shutter speed of hand wobble boundary more than the end, returned the processing that begins from above-mentioned steps S401 in order to prepare next release-push operation.
According to above-mentioned execution mode, in the increase of the ISO sensitivity value of guaranteeing to calculate as the part corresponding with the luminous quantity deficiency of photoflash lamp, can carry out the adjustment of suitable ISO sensitivity value, make the exposure of the background parts that belongs to the zone that flash light can not arrive can be inexcessive.In addition, far away more apart from the distance of main subject, the not enough degree of the luminous quantity of photoflash lamp is just big more, the required recruitment of ISO sensitivity value also just big more (that is, required photosensitivity recruitment changes with the distance of main subject).In the present embodiment, the influence of control shutter speed to suppress to cause because of this phenomenon makes the exposure levels of background constant.
Therefore, can be when preventing to produce hand wobble reliably, the brightness of the background parts during according to photoflash photography obtains finer proper exposure.
In addition, can judge state of a control being used as variable as shutter speed TvLIMIT eigenvalue, corresponding flash light-emitting time of this camera, the shutter speed hand wobble boundary value Tv (hand wobble) corresponding with the focal length of the lens optical system of selecting this moment 12.
Therefore, it is easy to control required calculation process transfiguration, can shorten carry out the 2nd releasing operation after, lag behind the release time when pre-luminous transfer is formal luminescence decay.
In addition, in the above description, the photosensitivity of regulating the ISO sensitivity value is adjusted functional unit be illustrated by the example that the circuit unit that comprises CDS15, amplifier 16 and A/D change-over circuit 17 (photosensitivity is adjusted functional unit SCU) constitutes.In these execution modes, the ISO sensitivity value adjusting that can constitute photosensitivity adjustment functional unit SCU is mainly carried out the adjustment of ISO sensitivity value by the gain adjustment of amplifier 16.But design of the present invention is not limited to this example.For example, the adjustment of ISO sensitivity value also can be the structure of the signal gain of other circuit units of control (for example image processing circuit 18) under the control of system controller 24 except that above-mentioned example.
In addition, the present invention is not limited to above-mentioned execution mode, can carry out various distortion and implement in the scope that does not break away from its main idea.
In addition, comprise the invention in various stages in the above-described embodiment, can extract various inventions out by the appropriate combination of disclosed a plurality of inscapes.For example, even the several inscapes of deletion from all inscapes shown in the execution mode, also can solve at least one problem described in the problem to be solved in the present invention, and when obtaining at least one effect described in the invention effect, then can this inscape of deletion and structure extract out as invention.
According to the present invention, because with the exposure value that obtains when strobe light unit is not luminous is benchmark, exposure value when comprising the photoflash photography of above-mentioned ISO sensitivity value at least from dynamic(al) correction, so can implement to calculate automatically the photoflash photography of setting the exposure value that is suitable for the background parts both sides in the scope that main subject and flash light can not arrive.
Claims (6)
1. digital camera has: imaging apparatus is used to obtain the opto-electronic conversion corresponding with the picture of the subject of imaging on the shooting face of oneself and exports; The time for exposure control unit is used to control effective exposure time of this imaging apparatus; Photosensitivity is adjusted functional unit, regulates the ISO sensitivity value of the magnification ratio corresponding camera of exporting with the opto-electronic conversion of above-mentioned imaging apparatus; And strobe light unit, be used for to above-mentioned subject projection light, it is characterized in that, main control unit with following each action of centralized control, that is, the 1st conditions of exposure is calculated action: calculate the preparation of not following above-mentioned strobe light unit luminous, comprise above-mentioned effective exposure time and ISO sensitivity value make a video recording by above-mentioned imaging apparatus the time the proper exposure condition; The 2nd conditions of exposure is calculated action: by the luminous light modulation of the preparation of following above-mentioned strobe light unit action, the above-mentioned at least ISO sensitivity value of being calculated by above-mentioned the 1st conditions of exposure in the conditions of exposure that action calculates is proofreaied and correct, calculated this conditions of exposure; And following action:, carry out exposure as the above-mentioned imaging apparatus of original photography action according to calculate the conditions of exposure that action is calculated and determined by the 2nd conditions of exposure.
2. digital camera according to claim 1, it is characterized in that, calculate action as above-mentioned the 2nd conditions of exposure, above-mentioned main control unit is to also proofreading and correct, calculate this conditions of exposure that is applicable to original photography action the effective exposure time of being calculated action by above-mentioned the 1st conditions of exposure and calculating.
3. digital camera according to claim 1, it is characterized in that, above-mentioned main control unit, calculate in the action at above-mentioned the 2nd conditions of exposure, as above-mentioned effective exposure time, be provided with its value is controlled at the boundary value of regulation with interior condition, calculated for the 1st time for exposure, and, this condition is not set calculated for the 2nd time for exposure, calculate and the required regulated quantity of the 1st time for exposure of being calculated with the corresponding above-mentioned ISO sensitivity value of difference of the 2nd time for exposure, consider that at least this calculated value proofreaies and correct calculated the ISO sensitivity value that action calculates by above-mentioned the 1st conditions of exposure, decision is applicable to the conditions of exposure that original photography is moved.
4. digital camera according to claim 1, it is characterized in that, above-mentioned main control unit, calculate in the action at above-mentioned the 2nd conditions of exposure, as above-mentioned effective exposure time, be provided with its value is controlled at the boundary value of regulation with interior condition, calculated for the 1st time for exposure, and, this condition is not set calculates above-mentioned the 2nd time for exposure, calculate and the 1st time for exposure and the corresponding above-mentioned ISO sensitivity value of difference of the 2nd time for exposure and the required separately regulated quantity of above-mentioned effective exposure time calculated, at least consider that this calculated value proofreaies and correct calculated ISO sensitivity value and the above-mentioned effective exposure time that action calculates by above-mentioned the 1st conditions of exposure, calculate the conditions of exposure that is applicable to original photography action.
5. digital camera has: imaging apparatus is used to obtain the opto-electronic conversion corresponding with the picture of the subject of imaging on the shooting face of oneself and exports; The time for exposure control unit is used to control effective exposure time of this imaging apparatus; Photosensitivity is adjusted functional unit, regulates the ISO sensitivity value of the magnification ratio corresponding camera of exporting with the opto-electronic conversion of above-mentioned imaging apparatus; And strobe light unit, be used for to above-mentioned subject projection light, it is characterized in that, main control unit with following each action of centralized control, that is, the 1st conditions of exposure is calculated action: calculate the preparation of not following above-mentioned strobe light unit luminous, comprise above-mentioned effective exposure time and ISO sensitivity value make a video recording by above-mentioned imaging apparatus the time the proper exposure condition; The 2nd conditions of exposure is calculated action: by the luminous light modulation of the preparation of following above-mentioned strobe light unit action, the above-mentioned at least ISO sensitivity value of being calculated by above-mentioned the 1st conditions of exposure in the conditions of exposure that action calculates is proofreaied and correct, calculated this conditions of exposure; And following action: according to calculate the conditions of exposure that action is calculated and determined by the 2nd conditions of exposure, execution is as the exposure of the above-mentioned imaging apparatus of original photography action, and, above-mentioned main control unit the value of above-mentioned effective exposure time is not limited in the regulation boundary value with the 1st interior control model in, also proofread and correct calculate the effective exposure time that action calculates by above-mentioned the 1st conditions of exposure, calculate this conditions of exposure that is applicable to original photography action, the value of above-mentioned effective exposure time is limited in the regulation boundary value with the 2nd interior control model in, be provided with the value of above-mentioned effective exposure time is controlled at the regulation boundary value with interior condition, calculated for the 1st time for exposure, this condition is not set calculated for the 2nd time for exposure, the required regulated quantity of the 1st time for exposure of calculating and being calculated and the corresponding above-mentioned ISO sensitivity value of difference of the 2nd time for exposure, at least consider that this calculated value proofreaies and correct calculated the ISO sensitivity value that action calculates by above-mentioned the 1st conditions of exposure, calculate and determine to be applicable to the conditions of exposure of original photography action.
6. digital camera has: imaging apparatus is used to obtain the opto-electronic conversion corresponding with the picture of the subject of imaging on the shooting face of oneself and exports; The time for exposure control unit is used to control effective exposure time of this imaging apparatus; Photosensitivity is adjusted functional unit, regulates the ISO sensitivity value of the magnification ratio corresponding camera of exporting with the opto-electronic conversion of above-mentioned imaging apparatus; And strobe light unit, be used for to above-mentioned subject projection light, it is characterized in that, main control unit with following each action of centralized control, that is, the 1st conditions of exposure is calculated action: calculate the preparation of not following above-mentioned strobe light unit luminous, comprise above-mentioned effective exposure time and ISO sensitivity value make a video recording by above-mentioned imaging apparatus the time the proper exposure condition; The 2nd conditions of exposure is calculated action: by the luminous light modulation of the preparation of following above-mentioned strobe light unit action, the above-mentioned at least ISO sensitivity value of being calculated by above-mentioned the 1st conditions of exposure in the conditions of exposure that action calculates is proofreaied and correct, calculated this conditions of exposure; And following action: according to calculate the conditions of exposure that action is calculated and determined by the 2nd conditions of exposure, execution is as the exposure of the above-mentioned imaging apparatus of original photography action, and, above-mentioned main control unit the value of above-mentioned effective exposure time is not limited in the regulation boundary value with the 1st interior control model in, also proofread and correct calculate the effective exposure time that action calculates by above-mentioned the 1st conditions of exposure, calculate this conditions of exposure that is applicable to original photography action, the value of above-mentioned effective exposure time is limited in the regulation boundary value with the 2nd interior control model in, be provided with the value of above-mentioned effective exposure time is controlled at the regulation boundary value with interior condition, calculated for the 1st time for exposure, this condition is not set calculated for the 2nd time for exposure, calculate and the 1st time for exposure and the corresponding above-mentioned ISO sensitivity value of difference of the 2nd time for exposure and the required separately regulated quantity of above-mentioned effective exposure time calculated, at least consider that this calculated value proofreaies and correct calculated ISO sensitivity value and the effective exposure time that action calculates by above-mentioned the 1st conditions of exposure, calculate and determine to be applicable to the conditions of exposure of original photography action.
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| CN100420281C (en) * | 2004-12-28 | 2008-09-17 | 佳能株式会社 | Image sensing apparatus and image sensing apparatus control method |
| CN101854462A (en) * | 2009-03-12 | 2010-10-06 | 索尼公司 | Image processing equipment, image processing method and computer program |
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| CN1941852B (en) * | 2005-09-30 | 2011-02-16 | 卡西欧计算机株式会社 | Imaging device, imaging method |
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| CN100420281C (en) * | 2004-12-28 | 2008-09-17 | 佳能株式会社 | Image sensing apparatus and image sensing apparatus control method |
| US7957637B2 (en) | 2005-09-30 | 2011-06-07 | Casio Computer Co., Ltd. | Imaging device, imaging method and program |
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| CN101945218A (en) * | 2010-08-25 | 2011-01-12 | 中国科学院长春光学精密机械与物理研究所 | High-frame frequency CCD camera system |
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