CN100378575C - Power control correcting device and method for flash lamp of digital camera - Google Patents
Power control correcting device and method for flash lamp of digital camera Download PDFInfo
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- CN100378575C CN100378575C CNB03156643XA CN03156643A CN100378575C CN 100378575 C CN100378575 C CN 100378575C CN B03156643X A CNB03156643X A CN B03156643XA CN 03156643 A CN03156643 A CN 03156643A CN 100378575 C CN100378575 C CN 100378575C
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Abstract
The present invention relates to a power control correcting device and method for a flash lamp of a digital camera; the correcting device comprises a dark box for placing the digital camera to be corrected, a standard shot object arranged in the dark box, and a correcting control unit for executing a correcting program and controlling the correcting of the power size of the flash lamp. The correcting method comprises the following steps: the digital camera is started to shoot the standard shot object in a prearranged power size; an average brightness value in an area range of a shot image shift is obtained; the average brightness value and an average brightness range are compared; when the average brightness value is not in the average brightness range, the power size of the flash lamp of the digital camera is adjusted according to the average brightness value and the prearranged power size. The correcting control unit controls the digital camera to shoot the standard shot object in the dark box; then, the average brightness value of the shot images is calculated to adjust the flash lamp power in the proper average brightness range to improve the shot image quality of the digit camera.
Description
Technical field
The present invention relates to a kind of digital camera, particularly relate to a kind of flashlamp output control calibration apparatus and method of digital camera.
Background technology
In recent years, along with significantly improving of numeral science and technology, add the high development of Internet and multimedia technology, many images are all wished to be converted to digitized video and are handled.So, utilize digital camera (Digital Camera) directly to capture scene in kind, and capture image on file or the picture with optical scanner (OpticalScanner), and be converted into digital image data (data) output, be beneficial to the user on computing machine or other electronic product, carry out the actions such as demonstration, identification (OCR), editor, storage and output of digital image archives.
Owing to use digital camera directly to capture scene in kind, compared in the camera of conventional apparatus egative film, except using the numerical digit mode stores and edit, more because the development rapidly of electronics technology, it is more and more big to make it can take capacity, the image quality of its shooting is also more and more exquisite, and its price is also popularized day by day.Therefore, digital camera is existing recently replaces traditional camera gradually, and is the generally accepted trend of user.
In order to satisfy the demand of user for image quality, in the digital camera manufacture process, the calibration apparatus and the method for also meeting the tendency and exporting with the flashlamp of recoverable digital camera, to remedy the error of digital camera because of sensitization part characteristic and mechanism's assembling, the disappearance of the flashlamp output accuracy deficiency that causes further promotes digital camera captured image quality when opening flashlamp.
This shows that above-mentioned existing digital camera still has defective, and demands urgently further being improved.In order to solve the defective of existing digital camera, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but does not see always that for a long time suitable design finished by development, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective of the existence of above-mentioned existing digital camera, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, actively studied innovation, in the hope of founding a kind of flashlamp output control calibration apparatus and method of new digital camera, can improve general existing digital camera, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
Fundamental purpose of the present invention is, overcome the defective that existing digital camera exists, and a kind of flashlamp output control calibration apparatus and method of new digital camera be provided, but technical problem underlying to be solved is the flashlamp output that makes its adjustment digital camera, make flashlamp output all can fall into a mean flow rate scope with different digital cameras in the machine, and can promote the quality of the captured image of digital camera, thereby be suitable for practicality more.
Purpose of the present invention and to solve its technical problem underlying be to adopt following technical scheme to realize.The flashlamp output control calibration apparatus of a kind of digital camera that proposes according to the present invention is applicable to the output size of the flashlamp of adjustment one digital camera, and it comprises: a camera bellows, have a perforate, and treat this digital camera of adjustment in order to placement; One standard object being shot is positioned in this camera bellows, in order to the target of taking as this digital camera; And an adjustment control module, in order to carrying out an adjustment program, with the adjustment of the output size of the flashlamp of controlling this digital camera.
Purpose of the present invention and solve its technical problem underlying and also realize by the following technical solutions.A kind of flashlamp output control adjusting process according to the present invention proposes is applicable to the output size of coming the flashlamp of adjustment one digital camera with standard object being shot, and it comprises the following steps:
Start this digital camera and take this standard object being shot with a default output size; Obtain one of the regional extent average brightness value of the captured image shelves of this digital camera; This average brightness value and a mean flow rate scope are made comparisons; And when this average brightness value does not fall into this mean flow rate scope, with reference to this average brightness value with should default output size, adjust the output size of the flashlamp of this digital camera.
The object of the invention to solve the technical problems can also be further achieved by the following technical measures.
The flashlamp output control calibration apparatus and the method for aforesaid digital camera, wherein said flashlamp output control calibration apparatus, wherein said adjustment program comprises: start this digital camera and take this standard object being shot with a default output size; Obtain one of the regional extent average brightness value of the captured image shelves of this digital camera; This average brightness value and a mean flow rate scope are made comparisons; And
When this average brightness value does not fall into this mean flow rate scope, with reference to this average brightness value with should default output size, adjust the output size of the flashlamp of this digital camera.
Aforesaid flashlamp output control calibration apparatus, wherein said geofence is the scope at the center 70% of the captured image shelves of this digital camera.
Aforesaid flashlamp output control calibration apparatus, wherein said average brightness value is the rgb value with each calculation level of the captured image shelves of this digital camera, calculate the brightness value Yd of each calculation level according to the formula of Yd=0.3R+0.59G+0.11B, ask average again and get.
Aforesaid flashlamp output control calibration apparatus, wherein when target average brightness value one of in this mean flow rate scope be that Ystd, this average brightness value are that Y was should preset the output size for PWM1 the time, then should presetting of adjusted this digital camera exported big or small PWM2=PWM1+ (Y-Ystd) * K, and K is for adjusting coefficient.
Aforesaid flashlamp output control calibration apparatus, wherein said standard object being shot comprises that reflectivity is 18% a grey paper.
Aforesaid flashlamp output control calibration apparatus, wherein said adjustment control module comprises a personal computer.
The object of the invention to solve the technical problems can also be further achieved by the following technical measures.
Aforesaid flashlamp output control adjusting process, wherein said geofence is the scope at the center 70% of the captured image shelves of this digital camera.
Aforesaid flashlamp output control adjusting process, wherein said average brightness value is the rgb value with each calculation level of the captured image shelves of this digital camera, calculate the brightness value Yd of each calculation level according to the formula of Yd=0.3R+0.59G+0.11B, ask average again and get.
Aforesaid flashlamp output control adjusting process, wherein when target average brightness value one of in this mean flow rate scope be that Ystd, this average brightness value are that Y was should preset the output size for PWM1 the time, then should presetting of adjusted this digital camera exported big or small PWM2=PWM1+ (Y-Ystd) * K, and K is for adjusting coefficient.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The invention provides a kind of flashlamp output control calibration apparatus, applicable to the output size of the flashlamp of adjustment digital camera.This flashlamp output control calibration apparatus comprises: camera bellows, standard object being shot and adjustment control module.Wherein, camera bellows has a perforate, treats the digital camera of adjustment in order to placement, and in camera bellows, place standard object being shot, with the target of taking, and use the adjustment control module to carry out an adjustment program, with the output size of the flashlamp of control adjustment digital camera as digital camera.
In one embodiment, the adjustment program of adjustment control module execution comprises: start digital camera and come shooting standard object being shot with the default output size of flashlamp; One regional extent of the image shelves of choosing a digital camera captured, and ask for the average brightness value of the image of this regional extent; Again an average brightness value and a mean flow rate scope are made comparisons; And when average brightness value does not fall into the mean flow rate scope, default output size with reference to average brightness value and aforementioned flashlamp, adjust the output size of the flashlamp of digital camera, and repeat above program when the average brightness value of the output of flashlamp falls into the mean flow rate scope till.
In one embodiment, the regional extent of selection is the scope at the center 70% of the captured image shelves of digital camera.
In one embodiment, be rgb value with each calculation level of the captured image shelves of digital camera, calculate the brightness value Yd of each calculation level according to the formula of Yd=0.3R+0.59G+0.11B, ask it average and calculate average brightness value again.
In one embodiment, suppose that a target average brightness value in the mean flow rate scope is that the average brightness value of Ystd, calculating is that the default output size used when taking of Y is during as PWM1, then the flashlamp of adjusted digital camera is exported big or small PWM2 and is: PWM2=PWM1+ (Y-Ystd) * K, K wherein is for adjusting coefficient.According to the setting of experiment, when taking for the first time, get K=0.55, when taking for the second time, get K=0.3.
In one embodiment, the standard of using object being shot is the grey paper of reflectivity 18%.
In one embodiment, be to use personal computer to be used as the adjustment control module, and the adjustment program of carrying out is the program on the personal computer.
The present invention provides a kind of flashlamp output control adjusting process in addition, applicable to the output size of coming the flashlamp of adjustment digital camera with standard object being shot.This flashlamp output control adjusting process comprises the following steps: to start digital camera and comes shooting standard object being shot with the default output size of flashlamp; One regional extent of the image shelves of choosing a digital camera captured, and ask for the average brightness value of the image of this regional extent; Then an average brightness value and a mean flow rate scope are made comparisons; And when average brightness value does not fall into the mean flow rate scope, default output size with reference to average brightness value and aforementioned flashlamp, adjust the output size of the flashlamp of digital camera, and repeat above program when the average brightness value of the output of flashlamp falls into the mean flow rate scope till.
Wherein, the regional extent of selection is the scope at the center 70% of the captured image shelves of digital camera.
Wherein, be rgb value with each calculation level of the captured image shelves of digital camera, calculate the brightness value Yd of each calculation level according to the formula of Yd=0.3R+0.59G+0.11B, ask it average and calculate average brightness value again.
Wherein, suppose that a target average brightness value in the mean flow rate scope is that the average brightness value of Ystd, calculating is that the default output size used when taking of Y is during as PWM1, then the flashlamp of adjusted digital camera is exported big or small PWM2 and is: PWM2=PWM1+ (Y-Ystd) * K, K wherein is several for adjusting.According to the setting of experiment, when taking for the first time, get K=0.55, when taking for the second time, get K=0.3.
By in the above-mentioned explanation as can be known, use the flashlamp output control calibration apparatus and the method for a kind of digital camera provided by the present invention, but the then flashlamp of adjustment digital camera output, make the flashlamp output of different digital cameras all can fall into a mean flow rate scope, and can promote the quality of the captured image of digital camera, thereby be suitable for practicality more.
In sum, the flashlamp output control calibration apparatus and the method for digital camera of the present invention, it is to control digital camera with the adjustment control module to take standard object being shot in the camera bellows, calculate the average brightness value of captured image again, be output in the fair average brightness range with the flashlamp of adjusting digital camera, and then can promote the quality of the captured image of digital camera.It has above-mentioned many advantages and practical value, and in like product and method, do not see have similar structural design and method to publish or use and really genus innovation, no matter it all has bigger improvement on product structure, control method or function, have large improvement technically, and produced handy and practical effect, and more existing product has the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Concrete structure of the present invention and manufacture method thereof are provided in detail by following examples and accompanying drawing.
Description of drawings
Fig. 1 is a kind of calcspar of device for controlling flashlight of digital camera.
Fig. 2 is a kind of flashlamp output control calibration apparatus synoptic diagram of the preferred embodiment according to the present invention.
Fig. 3 is a kind of flashlamp output control adjusting process process flow diagram of the preferred embodiment according to the present invention.
Fig. 4 is the imagery zone scope synoptic diagram of the preferred embodiment according to the present invention.
104 charging voltage circuit for detecting, 106 firing circuit for flashlamps
108 light adjusting circuits, 110 flashlamp
112 object 114 electric capacity being shot
116 charging circuits, 200 flashlamp output control calibration apparatus
211 perforates of 210 camera bellows
220 standards object being shot (object), 230 adjustment control modules
240 digital cameras S310～S340 method step
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the flashlamp output control calibration apparatus and its concrete structure of method, method, step, feature and effect thereof of the digital camera that foundation the present invention is proposed, describe in detail as after.
Seeing also shown in Figure 1ly, is the calcspar of the device for controlling flashlight of a digital camera.This device for controlling flashlight comprises: charging circuit 116, electric capacity 114, charging voltage circuit for detecting 104, firing circuit for flashlamp 106 and light adjusting circuit 108, wherein:
This charging circuit 116 can receive the charging enable signal CHG_EN that is sent by the CPU (central processing unit) (not shown), with activation charging circuit 116, and begins electric capacity 114 is charged, and makes electric capacity 114 charge to desired charging voltage.
This charging voltage circuit for detecting 104, it couples charging circuit 116, whether reached the voltage of expectation in order to the detecting charging voltage, when reaching the voltage of expectation, then the forbidden energy charging circuit 116, make it stop electric capacity 114 is continued charging, the while also sends charging and finishes signal CHG_RDY, has finished charging with the notice CPU (central processing unit).
Afterwards, the CPU (central processing unit) lamp trigger signals STB_TRIG that flashes makes firing circuit for flashlamp 106 activations, and the energy of control flashlamp 110 utilization charging voltages, to send incident light to object 112 being shot.In addition, the reflected light that 108 inductions of light adjusting circuit are reflected by object 112 being shot, and reflected light accumulative total is converted to a photoreceptor voltage, when photoreceptor voltage during greater than the reference voltage in the light adjusting circuit 108, light adjusting circuit 108 meeting forbidden energy firing circuit for flashlamps 106, so that flashlamp stops is luminous, use the output size of control flashlamp 110.
Wherein, the size of the reference voltage of light adjusting circuit 108, be to change and get by the pulse wave width modulation signal STB_REF that CPU (central processing unit) is sent, therefore, in order to remedy the inconsistency of digital camera part characteristic and mechanism assembling, the pulse bandwidth of the pulse wave width modulation signal STB_REF of flashlamp output size that must paired domination number sign indicating number camera is set and is carried out adjustment, with the quality of the captured image of further lifting digital camera.
Seeing also shown in Figure 2ly, is a kind of flashlamp output control calibration apparatus synoptic diagram of the preferred embodiment according to the present invention.The flashlamp output control calibration apparatus 200 of preferred embodiment of the present invention, it comprises: camera bellows 210, standard object 220 being shot and adjustment control module 230.
Wherein, camera bellows 210 can avoid influencing the precision of adjustment in order to isolated extraneous light, and supplies to take the standard object 220 being shot that is positioned in the camera bellows 210, and produces a filmed image.Therefore, as shown in figure, have a perforate 211 on the camera bellows 210, treat the digital camera 240 of adjustment with placement, the flashlamp of digital camera 240 and camera lens position are towards camera bellows inside; This digital camera 240 and use for example are that the USB connecting line is connected to adjustment control module 230, with an adjustment program of accepting to carry out in the adjustment control module 230, control the output size of the flashlamp of adjustment digital camera 240.
Herein, the standard of using object 220 being shot is the grey paper of reflectivity 18%, and the adjustment control module 230 that uses is a personal computer then, and carries out a program on personal computer, with the carrying out of control adjustment program.
See also shown in the process flow diagram of Fig. 3, be positioned over when digital camera 240 in the perforate 211 of camera bellows 210, and be connected to when for example being the adjustment control module 230 of personal computer, just can begin to carry out one of control adjustment program program on the personal computer, to begin to carry out adjustment.
In the S310 step, the program of personal computer can be controlled startup digital camera 240 and come shooting standard object 220 being shot with the default output size of flashlamp, and this step for example is to set the big or small PWM1=0 of default output * 10 of flashlamp.
In the S320 step, the regional extent of 240 captured image shelves of choosing a digital camera, and ask for the average brightness value of the image of this regional extent.The regional extent that this step is selected can be as shown in Figure 4, the scope of the center 70% of promptly captured image shelves, and it is as follows to ask for the formula of average brightness value:
Yd＝0.3R+0.59G+0.11B ..........(1)
R wherein, G, B represent the rgb value of each calculation level of the captured image shelves of digital camera 240 respectively, and Yd then is the brightness value of each calculation level.Brightness value Yd according to each calculation level, can ask it on average to calculate average brightness value, this calculating action is resent to personal computer after can being chosen in and carrying out on the digital camera 240, or transmits captured image to personal computer by digital camera 240, carries out on personal computer again.
Afterwards, in the S330 step, personal computer is made comparisons an average brightness value and a target average brightness scope, whether has reached acceptable scope with the output size of the flashlamp of judging digital camera 240.For example when target average brightness value Ystd is 120, its mean flow rate scope can be set at 100 to 140.
The S330 step relatively after, when having reached acceptable scope, then for finishing adjustment as the output size of the flashlamp of finding digital camera 240.Otherwise, when average brightness value does not fall into acceptable mean flow rate scope, then enter the S340 step, adjust the output size of the flashlamp of digital camera with the foundation following formula:
PWM2＝PWM1+(Y-Ystd)*K ..........(2)
Wherein, Ystd is the target average brightness value, and Y is for calculating the average brightness value of gained, the default output size that PWM1 uses when taking, and PWM2 is the default output size of the flashlamp of adjusted digital camera, K then is the adjustment coefficient.Adjusting COEFFICIENT K can set according to experiment, and embodiments herein when taking for the first time, is got K=0.55, when taking for the second time, then gets K=0.3.Program is got back to the S310 step then, to repeat adjustment, when making the average brightness value of the output of flashlamp fall into the mean flow rate scope till.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, but every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (11)
1. calibration apparatus is controlled in the output of the flashlamp of a digital camera, is applicable to the output size of the flashlamp of adjustment one digital camera, it is characterized in that it comprises:
One camera bellows has a perforate, treats this digital camera of adjustment in order to placement;
One standard object being shot is positioned in this camera bellows, in order to the target of taking as this digital camera; And
One adjustment control module in order to carry out an adjustment program, is controlled with the big or small adjustment of flashlamp output to this digital camera.
2. flashlamp output control calibration apparatus according to claim 1 is characterized in that wherein said adjustment program comprises:
Start this digital camera and take this standard object being shot with a default output size;
Obtain the average brightness value of a regional extent of the captured image shelves of this digital camera;
This average brightness value and a mean flow rate scope are made comparisons; And
When this average brightness value does not fall into this mean flow rate scope, with reference to this average brightness value with should default output size, adjust the output size of the flashlamp of this digital camera.
3. flashlamp output control calibration apparatus according to claim 2 is characterized in that the central area of wherein said geofence for the captured image shelves of this digital camera, and described central area accounts for 70% of described image shelves Zone Full.
4. flashlamp output control calibration apparatus according to claim 2, it is characterized in that wherein said average brightness value is the rgb value with each calculation level of the captured image shelves of this digital camera, calculate the brightness value Yd of each calculation level according to the formula of Yd=0.3R+0.59G+0.11B, ask average again and get.
5. flashlamp output control calibration apparatus according to claim 2, it is characterized in that wherein when the target average brightness value in this mean flow rate scope be that Ystd, this average brightness value are that Y was should preset the output size for PWM1 the time, then should presetting of adjusted this digital camera exported big or small PWM2=PWM1+ (Y-Ystd) * K, and K is for adjusting coefficient.
6. flashlamp output control calibration apparatus according to claim 1 is characterized in that wherein said standard object being shot comprises that reflectivity is 18% a grey paper.
7. flashlamp output control calibration apparatus according to claim 1 is characterized in that wherein said adjustment control module comprises a personal computer.
8. a flashlamp output control adjusting process is applicable to the output size of coming the flashlamp of adjustment one digital camera with standard object being shot, it is characterized in that it comprises the following steps:
Start this digital camera and take this standard object being shot with a default output size;
Obtain the average brightness value of a regional extent of the captured image shelves of this digital camera;
This average brightness value and a mean flow rate scope are made comparisons; And
When this average brightness value does not fall into this mean flow rate scope, with reference to this average brightness value with should default output size, adjust the output size of the flashlamp of this digital camera.
9. flashlamp output control adjusting process according to claim 8 is characterized in that the central area of wherein said geofence for the captured image shelves of this digital camera, and described central area accounts for 70% of described image shelves Zone Full.
10. flashlamp output control adjusting process according to claim 8, it is characterized in that wherein said average brightness value is the rgb value with each calculation level of the captured image shelves of this digital camera, calculate the brightness value Yd of each calculation level according to the formula of Yd=0.3R+0.59G+0.11B, ask average again and get.
11. flashlamp output control adjusting process according to claim 8, it is characterized in that wherein when the target average brightness value in this mean flow rate scope be that Ystd, this average brightness value are that Y was should preset the output size for PWM1 the time, then should presetting of adjusted this digital camera exported big or small PWM2=PWM1+ (Y-Ystd) * K, and K is for adjusting coefficient.
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| CNB03156643XA CN100378575C (en) | 2003-09-05 | 2003-09-05 | Power control correcting device and method for flash lamp of digital camera |
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| CNB03156643XA CN100378575C (en) | 2003-09-05 | 2003-09-05 | Power control correcting device and method for flash lamp of digital camera |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1838853B (en) * | 2005-03-22 | 2010-05-05 | 通嘉科技股份有限公司 | Flash lamp control circuit |
| WO2006117874A1 (en) * | 2005-04-26 | 2006-11-09 | Canon Kabushiki Kaisha | Image capturing apparatus and its control method |
| CN101320194B (en) * | 2007-06-07 | 2010-09-29 | 鸿富锦精密工业（深圳）有限公司 | Flash lamp control system and method |
| CN101718949B (en) * | 2009-12-07 | 2011-12-28 | 苏州富士胶片映像机器有限公司 | Device for checking flashing functions of digital cameras |
| CN105374235A (en) * | 2015-11-26 | 2016-03-02 | 杨秋红 | Marxist theory teaching document collector |
| CN109218711A (en) * | 2018-09-14 | 2019-01-15 | Oppo（重庆）智能科技有限公司 | Detection method, system and the electronic equipment of flash lamp |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000075372A (en) * | 1998-08-28 | 2000-03-14 | Sigma Corp | Stroboscope device |
| CN2510892Y (en) * | 2001-12-21 | 2002-09-11 | 明碁电通股份有限公司 | Automatic exposure function testing device of digital camera |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000075372A (en) * | 1998-08-28 | 2000-03-14 | Sigma Corp | Stroboscope device |
| CN2510892Y (en) * | 2001-12-21 | 2002-09-11 | 明碁电通股份有限公司 | Automatic exposure function testing device of digital camera |
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