CN102879977A - Camera flash control method, control device and mobile terminal - Google Patents
Camera flash control method, control device and mobile terminal Download PDFInfo
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- CN102879977A CN102879977A CN2012104202272A CN201210420227A CN102879977A CN 102879977 A CN102879977 A CN 102879977A CN 2012104202272 A CN2012104202272 A CN 2012104202272A CN 201210420227 A CN201210420227 A CN 201210420227A CN 102879977 A CN102879977 A CN 102879977A
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Abstract
The invention discloses a camera flash control method, a control device and a mobile terminal. The method comprises the steps of obtaining photographing flash time necessary for taking an image by a camera and normal flash working time of a camera flash lamp; determining short flash time of the flash lamp, short flash interval time between two adjacent short flashes and short flash times according to the obtained photographing flash time and the normal flash working time; and during the photographing of the camera, controlling the flash lamp to flash for multiple times in the short flash time according to the short flash time, the short flash times and the short flash interval. By using the technical scheme of the invention to carry out flash control, the flash efficiency is increased, the heat quantity of the flash lamp is reduced, and a variety of flash driving chips and applications of the flash lamp can be compatible.
Description
Technical field
The invention belongs to technical field of electronic products, specifically, relate to camera flash control method, control device and portable terminal.
Background technology
Along with popularizing of smart mobile phone, the user is more and more higher to the performance requirement of taking pictures of smart mobile phone.At present, general medium and high classes smart mobile phone all is furnished with flashlamp, and flashlamp is as a critical function of mobile phone, and whether its flash time and photo opporunity be very large to the quality influence of taking a picture synchronously.If flash time is less than photo opporunity, meeting is so that the filaments of sun appear in the image edge part of taking, and has an obvious black-tape in bright dark critical section, causes picture quality relatively poor.
In order to solve described problem, settling mode of the prior art is more single, generally is to adopt the long flash of light of flash time to drive the flash time of chip drives flashlamp greater than photo opporunity.Although the filaments of sun appear in the image that can avoid like this taking, because the flashing current of flashlamp is larger, can waste more mobile phone electric energy, and the work meeting of glistening for a long time produces more heat, the serviceable life of having reduced flashlamp.
Summary of the invention
The present invention is directed to the problems referred to above that camera flash control exists in the prior art and a kind of camera flash control method and control device are provided, improved flash of light efficient, reduced the flashlamp thermal value, and can be compatible multiple different flashlamp and the flash of light application that drives chip.
For achieving the above object, camera flash control method of the present invention adopts following technical proposals to be achieved:
A kind of camera flash control method, described method comprises the steps:
Obtain camera and take required photographic flashing function time of piece image and the normal flash of light working time of camera flash-light;
Determine short interval time and the short number of times that dodges of dodging between the short sudden strain of a muscle time of flashlamp, adjacent twice short flashing according to the photographic flashing function time of obtaining and the working time of normally glistening;
In camera is taken pictures process, according to the short sudden strain of a muscle time, shortly dodge number of times and short the sudden strain of a muscle controlled flashlamp interval time to lack sudden strain of a muscle time short flashing repeatedly;
Wherein, the working time of normally glistening is the maximum flash time that flashlamp keeps flash luminance, and the short sudden strain of a muscle time of flashlamp is less than its normal flash of light working time, and repeatedly short flashing time and the photographic flashing function time of all weak point sudden strain of a muscle sums interval time greater than camera.
Aforesaid control method, for reducing energy consumption and reducing heat, the difference of the photographic flashing function time of described repeatedly short flashing time and all short sudden strain of a muscle sums interval time and camera is 5-15ms.
Aforesaid control method is for guaranteeing the flash of light performance, avoid human eye to find out the variation of brightness simultaneously that described weak point dodges interval time less than 50us.
It is preferably, described that short to dodge interval time be 20us.
Aforesaid control method, for taking into account take pictures performance and flashlamp flash of light life-span, described short sudden strain of a muscle number of times is 2-5 time.
Preferably, described short sudden strain of a muscle number of times is 3 times.
For realizing aforementioned goal of the invention, camera flash control device provided by the invention adopts following technical proposals to realize:
A kind of camera flash control device comprises flashlamp and flash of light driver element, and described device also comprises:
Normal flash of light working time acquiring unit is used for the normal flash of light working time of obtaining flashlamp;
The photographic flashing function time acquisition unit is used for obtaining camera and takes the required flash time of piece image;
Short sudden strain of a muscle control module is used for according to normally short sudden strain of a muscle interval time and the output between definite short sudden strain of a muscle time of flash of light working time and photographic flashing function time, short sudden strain of a muscle number of times and adjacent twice short flashing;
Described flash of light driver element according to the short information control flashlamp that dodges control module output to lack sudden strain of a muscle time short flashing repeatedly;
Wherein, the working time of normally glistening is the maximum flash time that flashlamp keeps flash luminance, and the short sudden strain of a muscle time of flashlamp is less than its normal flash of light working time, and repeatedly short flashing time and the photographic flashing function time of all weak point sudden strain of a muscle sums interval time greater than camera.
In addition, the present invention also provides a kind of portable terminal, and this portable terminal also is provided with camera flash control device described above except including camera.
Compared with prior art, advantage of the present invention and good effect are: the present invention is when controlling camera flash, take the technical scheme of control flashlamp repeatedly to glisten less than the short sudden strain of a muscle time of its maximum flash time in the process of taking pictures, guarantee the synchronous of photo opporunity and flash time with this, the problem of black line appears in the photographic images of having avoided disposable flash time to lack very much and having caused, and has improved the flash of light efficient of flashlamp.And flashlamp can utilize dispel the heat the interval time between adjacent dodge for short twice, effectively reduces the flashlamp thermal value, has improved flashlamp serviceable life.In addition, technical scheme of the present invention realizes easily, can compatible multiple different manufacturers and the flash of light of different model drive the application of chip and flashlamp.
After reading the specific embodiment of the present invention by reference to the accompanying drawings, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the structured flowchart of an embodiment of camera flash control device of the present invention;
Fig. 2 is the process flow diagram of an embodiment of camera flash control method of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail.
At first, take portable terminal as example, principle and the asynchronous problem that is prone to synchronous between the flash of light working time of photographic flashing function time of the camera that arranges in the portable terminal and flashlamp are described simply:
The frame per second of the photosensitive sensor of camera when transmitting image represents that with F piece image begins to be transmitted to last pixel from first pixel, approximately needs the time of t=1/F.CPU in the portable terminal is the photo opporunity of camera from sending photographing command to the whole process that reality grasps image, in the process of taking pictures, not all image all deposits among the ROM of portable terminal, but will lose first the x frame data before grabbing the required image of certain frame.So in the whole process of taking pictures, camera is from sending photographing command, abandoning some two field picture and use flashlamp to carry out obtaining of picture rich in detail until obtain the process need of required image.It is the photographic flashing function time that camera shooting piece image needs the time of flashlamp work, also just be the needed minimum flash time that gets a distinct image in the process of taking pictures, therefore, be that F, frame losing number are the camera of x for frame per second, the t of its photographic flashing function time T=(x+1).But the most frequently used flashlamp drives the normal flash of light working time of chip, also namely drives the maximum flash time Tx of flashlamp maintenance flash luminance less than T in the portable terminal at present.After flash time exceeds Tx, be still enabled state even flash of light this moment drives, but chip also can be reduced to the lower light illumination mode of brightness automatically, at this moment, the brightness of flashlamp is lower than normal flash luminance, can't realize the function of photographic flashing function.So because the reduction of flash luminance causes the back of the image of camera shooting to have filaments of sun along part, there is an obvious black-tape bright dark critical section, has affected the quality of taking pictures.And technology starting point of the present invention is also just in order to address this problem, in simple terms, the core concept that the present invention controls camera flash is that the control flashlamp repeatedly glistened with the short sudden strain of a muscle time less than its maximum flash time, utilize repeatedly flash of light to guarantee that whole flash time is not less than the photographic flashing function time, thereby realize the synchronous of photo opporunity and flash time.Technical scheme and implementation procedure can be with reference to the elaborations of following specific embodiment more specifically.
Please refer to Fig. 1, this Fig. 1 shows the structured flowchart of an embodiment of camera flash control device of the present invention.This embodiment as example, describes in detail the glisten structure of device of control of mobile terminal camera in the portable terminal that is provided with camera.
As shown in Figure 1, the camera flash control device of this embodiment except include flashlamp 15 and be connected with flashlamp 15, in order to the flash of light driver element 14 that drives flashlamp 15 work, also include:
Normal flash of light working time acquiring unit 11, for the normal flash of light working time of obtaining flashlamp, also namely drive the maximum flash time that flashlamp 15 keeps flash luminance, the serviceability that should depend on flash of light driver element 14 and flashlamp 15 the normal flash of light working time, obtains in conjunction with the performance parameter of flashlamp 15 manufacturer data that specifically can be by reading flash of light driver element 14;
Photographic flashing function time acquisition unit 12 is used for obtaining camera and takes the required flash time of piece image, and this time is depended on the performance of camera itself, can obtain by reading camera correlated performance parameter; And
The short control module 13 that dodges, be connected with photographic flashing function time acquisition unit 12 with normal flash of light working time acquiring unit 11 respectively, be used for according to normally short sudden strain of a muscle interval time and the output between definite short sudden strain of a muscle time of flash of light working time and photographic flashing function time, short sudden strain of a muscle number of times and adjacent twice short flashing;
Flash of light driver element 14 is connected with the short control module 13 that dodges, and can receive short information of dodging control module 13 outputs, and controls flashlamp 15 to lack sudden strain of a muscle time short flashing repeatedly according to this information.
Perhaps, short control module 13 and the flash of light driver element 14 of dodging is connected with host CPU (not shown) in the portable terminal respectively, host CPU reads short information of dodging control module 13 outputs, drive accordingly signal to the driver element 14 that glistens according to this information output, so by flash of light driver element 14 control flashlamp 15 to lack sudden strain of a muscle time short flashing repeatedly.
In this embodiment, the normal flash of light working time refers to that flashlamp 15 keeps the maximum flash time of flash luminance, the short sudden strain of a muscle time of flashlamp is less than its normal flash of light working time, and repeatedly short flashing time and all short sudden strain of a muscle sums interval time are greater than the photographic flashing function time of camera, to guarantee that enough flash of light light is arranged when taking pictures, guarantee the quality of photographic images.
The specific works process of the control device of this embodiment can be with reference to flow process shown in Figure 2 and following detailed description to Fig. 2.
Please refer to Fig. 2, this Figure 2 shows that the process flow diagram of an embodiment of camera flash control method of the present invention.This flow process is based on the flash of light control device of Fig. 1 embodiment, still in the control portable terminal flash of light of camera as example.
As shown in Figure 2, to carry out the flow process of camera flash control as follows for this embodiment:
Step 21: flow process begins.
Step 22: obtain the photographic flashing function time of camera and the normal flash of light working time of flashlamp.
As mentioned above, the photographic flashing function time of camera refers to the required minimum flash time of camera shooting piece image, and this time is depended on the performance of camera itself, can obtain by reading camera correlated performance parameter.And the normal flash of light working time of flashlamp refers to that flashlamp keeps the maximum flash time of flash luminance, this time is depended on the serviceability of flash of light driver element and flashlamp, manufacturer data that can be by reading the flash of light driver element, obtains in conjunction with the performance parameter of flashlamp.
Step 23: determine the short sudden strain of a muscle time of flashlamp, short interval time and the short number of times that dodges of dodging.
Specifically, be to determine short sudden strain of a muscle time, short interval time and the short number of times that dodges of dodging according to photographic flashing function time and normal flash of light working time that step 22 is obtained.The principle that needs to follow in deterministic process is: the short sudden strain of a muscle time of flashlamp is slightly less than its normal flash of light working time, repeatedly short flashing time and all short sudden strain of a muscle sums interval time are greater than the photographic flashing function time of camera, to guarantee all to have the flash of light light irradiation of enough brightness in the whole process of taking pictures.
In addition, for reducing energy consumption and reducing heat, repeatedly the difference of the photographic flashing function time of short flashing time and all short sudden strain of a muscle sums interval time and camera is 5-15ms.
And, for guaranteeing the flash of light performance, avoid human eye to find out the variation of brightness simultaneously that weak point dodges interval time to be advisable less than 50us.It is preferably, short that to dodge interval time be 20us.
Further, for taking into account take pictures performance and flashlamp flash of light life-span, described short sudden strain of a muscle number of times is 2-5 time, is preferably 3 times.
For instance, be that 130ms, photographic flashing function time are the camera of 350ms for normal flash time, can control the short sudden strain of a muscle time and be 120ms, short to dodge interval time be 20us, short to dodge number of times be 3 times, like this, 3 short flashing time and all are short, and to dodge the interval time sum be (360ms+40us), be slightly larger than the camera shooting time, can realize the synchronous of flash time and photo opporunity.
Step 24: the control flashlamp is to lack sudden strain of a muscle time short flashing repeatedly.
According to the result of step 23, the control flashlamp to be lacking sudden strain of a muscle time short flashing repeatedly, and the time interval between every adjacent dodge for short twice dodges interval time for short.
Step 25: flash time arrives, and closes flashlamp.
Step 26: flow process finishes.
After utilizing short sudden strain of a muscle time of said method choose reasonable, short sudden strain of a muscle interval time and short sudden strain of a muscle number of times camera flash is controlled, can effectively solve because flashlamp drives the chip too short problem that causes flash photographing black line to occur of working time of normally glistening, improve the flash of light efficient of flashlamp.And flashlamp can utilize dispel the heat the interval time between adjacent dodge for short twice, effectively reduces the flashlamp thermal value, has improved flashlamp serviceable life.Said method can compatible multiple different manufacturers and the flash of light of different model drive the application of chip and flashlamp, method is simple, realizes easily, is applicable to the electronic product that portable terminal etc. has camera and flashlamp function.
Above embodiment is only in order to illustrating technical scheme of the present invention, but not limits it; Although with reference to previous embodiment the present invention is had been described in detail, for the person of ordinary skill of the art, still can make amendment to the technical scheme that previous embodiment is put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of the present invention's technical scheme required for protection.
Claims (10)
1. a camera flash control method is characterized in that, described method comprises the steps:
Obtain camera and take required photographic flashing function time of piece image and the normal flash of light working time of camera flash-light;
Determine short interval time and the short number of times that dodges of dodging between the short sudden strain of a muscle time of flashlamp, adjacent twice short flashing according to the photographic flashing function time of obtaining and the working time of normally glistening;
In camera is taken pictures process, according to the short sudden strain of a muscle time, shortly dodge number of times and short the sudden strain of a muscle controlled flashlamp interval time to lack sudden strain of a muscle time short flashing repeatedly;
Wherein, the working time of normally glistening is the maximum flash time that flashlamp keeps flash luminance, and the short sudden strain of a muscle time of flashlamp is less than its normal flash of light working time, and repeatedly short flashing time and the photographic flashing function time of all weak point sudden strain of a muscle sums interval time greater than camera.
2. control method according to claim 1 is characterized in that, the difference of the photographic flashing function time of described repeatedly short flashing time and all short sudden strain of a muscle sums interval time and camera is 5-15ms.
3. control method according to claim 1 is characterized in that, described weak point dodges interval time less than 50us.
4. control method according to claim 3 is characterized in that, it is 20us that described weak point dodges interval time.
5. each described control method in 4 according to claim 1 is characterized in that, described short to dodge number of times be 2-5 time.
6. control method according to claim 5 is characterized in that, described short sudden strain of a muscle number of times is 3 times.
7. a camera flash control device comprises flashlamp and flash of light driver element, it is characterized in that described device also comprises:
Normal flash of light working time acquiring unit is used for the normal flash of light working time of obtaining flashlamp;
The photographic flashing function time acquisition unit is used for obtaining camera and takes the required flash time of piece image;
Short sudden strain of a muscle control module is used for according to normally short sudden strain of a muscle interval time and the output between definite short sudden strain of a muscle time of flash of light working time and photographic flashing function time, short sudden strain of a muscle number of times and adjacent twice short flashing;
Described flash of light driver element according to the short information control flashlamp that dodges control module output to lack sudden strain of a muscle time short flashing repeatedly;
Wherein, the working time of normally glistening is the maximum flash time that flashlamp keeps flash luminance, and the short sudden strain of a muscle time of flashlamp is less than its normal flash of light working time, and repeatedly short flashing time and the photographic flashing function time of all weak point sudden strain of a muscle sums interval time greater than camera.
8. control device according to claim 7 is characterized in that, the difference of the photographic flashing function time of described repeatedly short flashing time and all short sudden strain of a muscle sums interval time and camera is 5-15ms; Described weak point dodges interval time less than 50us.
9. according to claim 7 or 8 described control device, it is characterized in that described short to dodge number of times be 2-5 time.
10. a portable terminal comprises camera, it is characterized in that, also is provided with each described camera flash control device in the claims 7 to 9 in the portable terminal.
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| CN201210420227.2A CN102879977B (en) | 2012-10-29 | 2012-10-29 | Camera flash control method, control device and mobile terminal |
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| CN201210420227.2A CN102879977B (en) | 2012-10-29 | 2012-10-29 | Camera flash control method, control device and mobile terminal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI474098B (en) * | 2013-05-08 | 2015-02-21 | Kd Internat Co Ltd | Method for taking a photo of an object in an industrial production line |
| TWI563845B (en) * | 2014-11-19 | 2016-12-21 | Method for taking photo with extension flash module of mobile device | |
| CN107567708A (en) * | 2015-03-30 | 2018-01-09 | 业纳遥控设备有限公司 | Camera system |
| CN112673310A (en) * | 2018-09-11 | 2021-04-16 | 保富图公司 | Computer-implemented method and system for coordinating taking a picture using a camera with a flash pulse that activates at least one flash device |
| US11863866B2 (en) | 2019-02-01 | 2024-01-02 | Profoto Aktiebolag | Housing for an intermediate signal transmission unit and an intermediate signal transmission unit |
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| US11863866B2 (en) | 2019-02-01 | 2024-01-02 | Profoto Aktiebolag | Housing for an intermediate signal transmission unit and an intermediate signal transmission unit |
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| CN102879977B (en) | 2015-03-04 |
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