CN100555056C - Flashlamps exciting method - Google Patents
Flashlamps exciting method Download PDFInfo
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- CN100555056C CN100555056C CNB2006100838372A CN200610083837A CN100555056C CN 100555056 C CN100555056 C CN 100555056C CN B2006100838372 A CNB2006100838372 A CN B2006100838372A CN 200610083837 A CN200610083837 A CN 200610083837A CN 100555056 C CN100555056 C CN 100555056C
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- flashlamp
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Abstract
A kind of Flashlamps exciting method, the focusing parameter that it can utilize image capture unit to produce when focusing is estimated shooting distance, and is dynamically determined Flashlamps exciting intensity according to this, with the light filling effect that obtains improveing.In addition, owing to omit pre-snap action, thereby can save electric power and shorten shooting time, to improve the usefulness of image capture unit and flashlamp.
Description
Technical field
What the present invention relates to is a kind of Flashlamps exciting method, particularly be a kind of Flashlamps exciting method that is used in image capture unit.
Background technology
In general image capture unit, digital camera for example, flashlamp is the assembly of using always, in order to the required light source of reinforcement when the pick-up image.Yet, in some more traditional camera, when needs use flashlamp, be to excite flashlamp, and can't adjust in response to shooting condition at that time with fixing excitation intensity.Therefore, except easy consumption electric power, also fail dynamically to adjust excitation intensity, to produce more suitable light filling effect.
In some advanced camera, the function of (preflash) that it is designed to have preflashing.That is, in the preceding preflashing of carrying out earlier of pick-up image, return camera with the brightness of feedback prevailing circumstances, and in order to determine follow-up flashlamp to lead the required excitation intensity of sudden strain of a muscle (mainflash).Yet, owing to need carry out preflashing earlier, thereby can expend more electric power, and elongate shooting time, cause the usefulness of camera and flashlamp not good.
In addition, existing camera fails suitably to transfer weak flashlamp when shooting at close range more, so that shooting results has the undesirable situation appearance of overexposure.
Summary of the invention
A purpose of the present invention is to propose a kind of Flashlamps exciting method, reaches when carrying out in-plant image capture, can avoid overexposure.In addition, owing to omit pre-snap action, thereby can save electric power and shorten shooting time, improve the usefulness of image capture unit and flashlamp.
Another object of the present invention is to propose a kind of Flashlamps exciting method, and it can carry out different Flashlamps exciting programs in response to varying environment brightness, to improve the usefulness of camera and flashlamp.
For achieving the above object, the technical solution used in the present invention is, a kind of Flashlamps exciting method is provided, and is to be used in an image capture unit with a flashlamp, and this Flashlamps exciting method comprises:
Detect an ambient brightness;
Judge whether this ambient brightness reaches a default brightness;
If this ambient brightness reaches this default brightness, carry out one first and excite program; And
If this ambient brightness does not reach this default brightness, carry out one second and excite program;
Wherein this first excites program to comprise:
Carry out a focusing program of this image capture unit, produce a focusing parameter;
According to this focusing parameter, estimate a shooting distance;
According to this shooting distance, determine an excitation intensity of this flashlamp; And
When this image capture unit pick-up image, excite this flashlamp according to this excitation intensity.
Description of drawings
Fig. 1 is the process flow diagram of first embodiment of Flashlamps exciting method of the present invention;
Fig. 2 is the process flow diagram of second embodiment of Flashlamps exciting method of the present invention;
Fig. 3 is the process flow diagram of the 3rd embodiment of Flashlamps exciting method of the present invention;
Fig. 4 is the synoptic diagram of an example that shows the corresponding relation of excitation intensity and shooting distance and camera lens hop count;
Fig. 5 is the process flow diagram of the 4th embodiment of Flashlamps exciting method of the present invention.
Description of reference numerals:
12～15: the flow process of first embodiment of Flashlamps exciting method.
51～53: the flow process of the 4th embodiment of Flashlamps exciting method.
Embodiment
The following embodiment that narrates is to be used in the image capture unit with flashlamp, for example digital camera.Fig. 1 is the process flow diagram of first embodiment of Flashlamps exciting method of the present invention, and this flow process comprises the following step:
Step 12: carry out a focusing program of image capture unit, to produce a focusing parameter;
Step 13:, estimate shooting distance according to this focusing parameter;
Step 14: according to this shooting distance, the excitation intensity of decision flashlamp; And
Step 15: when the image capture unit pick-up image, excite flashlamp according to this excitation intensity.
In the step 12, this focusing program is with the focal length that decides image capture unit, to obtain best image resolution.Institute produced when this focusing parameter was this focusing program of execution, can be in order to estimate shooting distance in step 13.In the step 14, shooting distance is long more, and the Flashlamps exciting intensity that is determined is strong more.Anti-, shooting distance is short more, and the excitation intensity that is determined is also weak more, the overexposure problem that so can avoid existing camera to cause often at close-up photography.
Fig. 2 is the process flow diagram of second embodiment of Flashlamps exciting method of the present invention, and it comprises the following step:
Step 22: carry out a focusing program of image capture unit, to produce a best focusing step number;
Step 23:, estimate shooting distance according to this best focusing step number;
Step 24: according to this shooting distance, the excitation intensity of decision flashlamp; And
Step 25: when the image capture unit pick-up image, excite flashlamp according to this excitation intensity.
In the step 22, this focusing program is with focus lens is moved forward and backward to diverse location (each position is to represent in the focusing step number (focus step number) of a reference position relatively) in the image capture unit, receive the light of penetrating focus lens by photosensory assembly (as Charged Coupled Device (CCD)), estimate according to this focus lens at the pairing correlative value in each position (contrast value).Correlative value is big more, represents image resolution good more.Therefore, this focusing program promptly is to look for an optimum position (or best focusing step number), can produce maximum correlative value to focus lens on this optimum position.Further, in step 23, can utilize this best focusing step number to estimate shooting distance.Fig. 3 is the process flow diagram of the 3rd embodiment of Flashlamps exciting method of the present invention, and it comprises the following step:
Step 32: carry out a focusing program of image capture unit, to produce a focusing parameter;
Step 33:, estimate shooting distance according to this focusing parameter;
Step 34: according to the camera lens hop count (zoom step) of this shooting distance and image capture unit, the excitation intensity of decision flashlamp; And
Step 35: when the image capture unit pick-up image, excite flashlamp according to this excitation intensity.
In this 3rd embodiment, the excitation intensity of flashlamp is to determine according to shooting distance and camera lens hop count.Fig. 4 is a form, and it shows an example of the corresponding relation of excitation intensity and shooting distance and camera lens hop count.This form is the empirical value via the experiment test gained, and different cameral can have different excitation intensity values with flashlamp, and each value in the form is to represent under close-up hop count and shooting distance pairing excitation intensity.As can be seen from Figure 4, when shooting distance long more, or camera lens hop count high more (also be about to camera lens further), required excitation intensity is strong more; Anti-, when shooting distance short more, or camera lens hop count low more (also being about to camera lens zooms out), required excitation intensity is weak more.In addition, in the 3rd embodiment, the corresponding relation of excitation intensity and shooting distance and camera lens hop count is to be stored in advance in the internal memory of image capture unit, takes during for shooting.
In a preferred embodiment, except shooting distance and camera lens hop count, also consider the influence of exposure parameter to required Flashlamps exciting intensity.In this preferred embodiment, exposure parameter such as aperture (Iris), exposure value and light sensitivity (ISO) etc., its value can adjust in response to the ambient brightness that is detected, and, more can determine a resize ratio according to exposure parameter, peremptory excitation intensity it is multiplied by the excitation intensity value (it is to determine according to shooting distance and camera lens hop count) of the internal memory that is stored in aforementioned the 3rd embodiment, so that can adjust in response to different exposure parameter values.Change speech, in this preferred embodiment, required Flashlamps exciting intensity is to determine according to shooting distance, camera lens hop count and exposure parameter.
Fig. 5 is the process flow diagram of the 4th embodiment of Flashlamps exciting method of the present invention.In the 4th embodiment, be to detect ambient brightness earlier, and decision want the step 12 of execution graph 1 to 15 (are called first and excite program) or another Flashlamps exciting method (be called second and excite program) according to this.Mix use in this way and excite program for two kinds, in running, can have more elasticity.As shown in Figure 5, this flow process comprises the following step:
Step 50: detecting ambient brightness;
Step 51: judge whether this ambient brightness reaches a default brightness, does not then skip to step 53 if reach, and then continues execution in step 52 if arrive default brightness;
Step 52: carry out first and excite program (step 12 that is Fig. 1 is to 15), and process ends;
Step 53: carry out second and excite program.
In the step 51, when ambient brightness did not reach this default brightness, expression brightness was too low, so that can't utilize focusing to estimate shooting distance and determine excitation intensity (promptly first exciting program), promptly need carry out second and excite program (being step 53) this moment, to excite flashlamp.The size that should preset brightness is different along with different image capture units.
In the step 53, second to excite program be to start an auxiliary focusing lamp reinforcement brightness when carrying out the focusing program, so that image capture unit is focused.Then, the step 13 of execution graph 1 is to 15, to replenish the flashlamp of suitable intensity when the image capture unit pick-up image.In addition, second to excite program can also be to carry out earlier pre flashing of flash lamp, then when the image capture unit pick-up image, carries out the main snap action of flashlamp.
The above only is preferred embodiment of the present invention, only is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that claim of the present invention limited, revise, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (4)
1. Flashlamps exciting method is to be used in an image capture unit with a flashlamp, it is characterized in that this Flashlamps exciting method comprises:
Detect an ambient brightness;
Judge whether this ambient brightness reaches a default brightness;
If this ambient brightness reaches this default brightness, carry out one first and excite program; And
If this ambient brightness does not reach this default brightness, carry out one second and excite program;
Wherein this first excites program to comprise:
Carry out a focusing program of this image capture unit, produce a focusing parameter;
According to this focusing parameter, estimate a shooting distance;
According to this shooting distance, determine an excitation intensity of this flashlamp; And
When this image capture unit pick-up image, excite this flashlamp according to this excitation intensity.
2. Flashlamps exciting method as claimed in claim 1 is characterized in that, this second excites program to comprise:
Carry out pre flashing of flash lamp, to determine an excitation intensity of this flashlamp; And
When this image capture unit pick-up image, carry out a main snap action of this flashlamp according to this excitation intensity.
3. Flashlamps exciting method as claimed in claim 1 is characterized in that, this second excites program to comprise:
Start an auxiliary focusing lamp and carry out a focusing program of this image capture unit, to produce a focusing parameter;
According to this focusing parameter, estimate a shooting distance;
According to this shooting distance, determine an excitation intensity of this flashlamp; And
When this image capture unit pick-up image, excite this flashlamp according to this excitation intensity.
4. Flashlamps exciting method as claimed in claim 1 is characterized in that, this focusing parameter is a best focusing step number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100838372A CN100555056C (en) | 2006-06-01 | 2006-06-01 | Flashlamps exciting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100838372A CN100555056C (en) | 2006-06-01 | 2006-06-01 | Flashlamps exciting method |
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| Publication Number | Publication Date |
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| CN101082755A CN101082755A (en) | 2007-12-05 |
| CN100555056C true CN100555056C (en) | 2009-10-28 |
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| CNB2006100838372A Expired - Fee Related CN100555056C (en) | 2006-06-01 | 2006-06-01 | Flashlamps exciting method |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761701A (en) * | 2011-04-28 | 2012-10-31 | 毕振玲 | Novel photographing control method |
| CN103118163A (en) * | 2011-11-16 | 2013-05-22 | 中兴通讯股份有限公司 | Method and terminal of controlling photographing flash light |
| CN103091828A (en) * | 2013-03-03 | 2013-05-08 | 赵忠华 | Laser lighting telescope |
| CN105721762B (en) * | 2014-12-04 | 2019-06-11 | 中兴通讯股份有限公司 | Flash lamp control method and device |
| CN104506777B (en) * | 2014-12-15 | 2017-08-01 | 广东欧珀移动通信有限公司 | A kind of method and device of control exposure of flash lamp |
| CN104618661A (en) * | 2015-03-05 | 2015-05-13 | 广东欧珀移动通信有限公司 | Camera light supplementing control method and device |
| CN105472269B (en) * | 2015-12-29 | 2018-09-04 | 广东欧珀移动通信有限公司 | Self-timer light compensation method, device, system, mobile terminal and self-shooting bar |
| CN105657280B (en) * | 2016-03-01 | 2019-03-08 | Oppo广东移动通信有限公司 | A kind of quick focusing method, device and mobile terminal |
| CN106131451A (en) * | 2016-08-04 | 2016-11-16 | 乐视控股（北京）有限公司 | The control method of capture apparatus, system and mobile terminal thereof |
| CN107026985A (en) * | 2017-05-12 | 2017-08-08 | 北京小米移动软件有限公司 | flash lamp control method, device, electronic equipment and storage medium |
| CN107888842B (en) * | 2017-12-28 | 2021-04-20 | 上海传英信息技术有限公司 | Flash lamp control method and control system based on intelligent terminal |
| CN111314618B (en) * | 2020-03-17 | 2021-09-28 | Tcl移动通信科技（宁波）有限公司 | Shooting method, shooting device, storage medium and mobile terminal |
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| CN1101723A (en) * | 1993-04-14 | 1995-04-19 | 三星航空产业株式会社 | Camera with automatic flash function and method for controlling the same |
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| CN101082755A (en) | 2007-12-05 |
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Owner name: HONGFUJIN PRECISION INDUSTRY (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: PULIER SCI-TECH CO., LTD. Effective date: 20090522 |
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Effective date of registration: 20090522 Address after: 2, Dong Huan two road, tenth Industrial Zone, Longhua Town, Baoan District, Guangdong, Shenzhen Province, China: 518109 Applicant after: Fujin Precision Industry (Shenzhen) Co., Ltd. Co-applicant after: Hon Hai Precision Industry Co., Ltd. Address before: Taiwan, China Applicant before: Pulier Science and Technology Co., Ltd. |
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Granted publication date: 20091028 Termination date: 20140601 |