CN102253567B - Flash control method of digital camera - Google Patents
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- CN102253567B CN102253567B CN201010182065.4A CN201010182065A CN102253567B CN 102253567 B CN102253567 B CN 102253567B CN 201010182065 A CN201010182065 A CN 201010182065A CN 102253567 B CN102253567 B CN 102253567B
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Abstract
The invention relates to a flash control method of a digital camera. The method is characterized by: firstly, determining corresponding indexes of each sensitivity value; then, respectively acquiring corresponding main flash intensities according to the sensitivity values so that reached object brightness after exposure is the same and a energy meter can be established; in addition, emitting a preset preflashing intensity according to each distance so as to obtain a corresponding preflashing brightness value; acquiring the main flash index according to the each distance, the greatest main flash intensity and the energy meter so that the reached object brightness after exposure is the same and a preflashing table can be established. During shooting, the corresponding main flash intensity can be acquired according to the preflashing brightness value and the preflashing table.
Description
Technical field
The present invention relates to a kind of digital camera, particularly relate to a kind of flash control method of digital camera.
Background technology
Flashlamp is the indispensable device of most of camera, in order to illuminate subject.Generally be for than dark scene, or in order to change the light quality.Flashlamp can be built-in, also can be external.
Though conventional digital camera has various mechanism with the size of lighting and control intensity of control flashlamp.Yet the flashlamp of traditional camera (is for example changed capacitor flashlamp in or the shade of flashlamp) when changing inside or external hardware, even old because of flashlamp, the time regular meeting cause the reduction of precision or degree of stability.
This shows that the flash control method of above-mentioned existing digital camera obviously still has inconvenience and defective, and demands urgently further being improved in method and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and conventional method does not have appropriate method to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of flash control method of new digital camera, in order to precision or the degree of stability of keeping flash of light, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to, propose a kind of flash control method of digital camera, the brightness value that it is tried to achieve according to pre flashing of flash lamp dodges intensity and sensitivity value by the form of setting up in advance to find out corresponding master.By this, allow the user under different settings, all can reach identical exposure.
The object of the invention to solve the technical problems realizes by the following technical solutions.The flash control method of a kind of digital camera that proposes according to the present invention, it comprises following steps: determine a plurality of index values, it corresponds to a plurality of sensitivity values respectively; At described a plurality of sensitivity values, to obtaining the corresponding main intensity of dodging greatly respectively, the object brightness that reaches after the feasible exposure is all identical, sets up by this and obtains an energy meter by little; At a plurality of distances, emission one default preflashing intensity is to obtain corresponding a plurality of preflashing brightness value; At described a plurality of distances, to dodge intensity and according to this energy meter, dodge index value to obtain corresponding a plurality of master according to maximum is main, the object brightness that reaches after the feasible exposure is all identical, sets up by this and obtains a preflashing table; And in when shooting, according to this preflashing brightness value and this preflashing table to be led sudden strain of a muscle intensity accordingly.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The flash control method of aforesaid digital camera, wherein in the deciding step of above-mentioned index value, this sensitivity value more corresponding this index value is littler.
The flash control method of aforesaid digital camera, wherein in the deciding step of above-mentioned index value, a basic sensitivity value and this basis sensitivity value double fixedly be divided into 16 five equilibriums between the sensitivity value.
The flash control method of aforesaid digital camera, wherein above-mentioned basic sensitivity value is ISO 100.
The flash control method of aforesaid digital camera, wherein the main intensity of dodging of first of above-mentioned energy meter is dodged intensity for this maximum master, and this sensitivity value of its correspondence is ISO 100.
The flash control method of aforesaid digital camera, wherein the establishment step of above-mentioned preflashing table comprises: at described a plurality of distances, use a basic sensitivity value, dodge intensity by near to recording corresponding master far respectively; When this master dodges intensity when reaching this maximum master and dodging intensity, then increase this sensitivity value, and corresponding this index value of record; And dodge this distance before the intensity at not reaching this maximum master, according to this energy meter, should lead and dodge intensity-conversion this index value extremely accordingly.
The flash control method of aforesaid digital camera, wherein above-mentioned basic sensitivity value is ISO 100.
The flash control method of aforesaid digital camera wherein in this shooting step, more comprises with interior difference method to obtain this master's sudden strain of a muscle intensity accordingly.
The flash control method of aforesaid digital camera wherein after this shooting step, more comprises: determine a new sensitivity value, and dodge intensity according to this energy meter to obtain the corresponding master of this new sensitivity value.
The flash control method of aforesaid digital camera, wherein above-mentioned shooting step comprises: according to this preflashing brightness value, inquire about this preflashing table to obtain an original main index value that dodges, wherein this original main index value corresponding one original sensitivity value of dodging.
The flash control method of aforesaid digital camera, wherein after this shooting step, more comprise: at a new sensitivity value, the corresponding new main index value that dodges that obtains, wherein should be original main that dodge index value and the corresponding index value of this original sensitivity value and equal this new main dodge index value and the corresponding index value of this new sensitivity value with; And according to should new master dodging index value, this master dodges intensity to obtain accordingly to inquire about this energy meter.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, the flash control method of digital camera of the present invention has following advantage and beneficial effect at least: the flash control method of digital camera of the present invention, the brightness value that it is tried to achieve according to pre flashing of flash lamp dodges intensity and sensitivity value by the form of setting up in advance to find out corresponding master.By this, allow the user under different settings, all can reach identical exposure.
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, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 shows the process flow diagram of the digital camera flash control method of the embodiment of the invention.
Fig. 2 shows the process flow diagram of the shooting of the embodiment of the invention.
11-13: step
131-135: substep
41-47: step
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of flash control method, method, step, feature and the effect thereof of the digital camera that foundation the present invention is proposed, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can be known to present in the following detailed description that cooperates with reference to graphic preferred embodiment.By the explanation of embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, the present invention is limited.
Fig. 1 shows the process flow diagram of the digital camera flash control method of the embodiment of the invention.At first, in step 11, determine the corresponding tables of (or definition) sensitivity value (being commonly referred to as the ISO value) and index value.The sensitivity value of following table one illustration part and corresponding index value.
Table one
| Sensitivity value (ISO) | Index value |
| ... | ... |
| 50 | 144 |
| ... | ... |
| 100 | 128 |
| 104 | 129 |
| ... | ... |
| 200 | 112 |
| ... | ... |
| 400 | 96 |
| ... | ... |
In the middle of table one, the sensitivity value is bigger, and then corresponding index value is littler; Otherwise the sensitivity value is littler, and then corresponding index value is bigger.In the present embodiment, be with ISO 100 as basic sensitivity value, it is corresponding to index value 128.Between the basic sensitivity value (ISO 200) of basic sensitivity value (ISO 100) and two times, fixedly be divided into 16 five equilibriums.Therefore, ISO 200 corresponding index values be 112 (=128-16).In like manner, ISO 50 corresponding index values then be 144 (=128+16).
Then, in step 12, set up an energy meter, as illustrated in table 2.The purpose of energy meter is to find out the main energy value of intensity (energy) and the transformational relation between the ISO value of dodging.In the present embodiment, the main intensity level 15000 that dodges of first row first (that is the upper left corner) of energy meter dodges intensity for the maximum master of digital camera, and its corresponding sensitivity value is ISO 100 (or index value 128).In other words, when the flashlamp of digital camera is beaten to the main sudden strain of a muscle of maximum intensity entirely, just can reach under the distance of object brightness, begin to set up energy meter.The main intensity of dodging shown in first row corresponds to index value 128,129...143 successively.These main intensity of dodging all make the digital camera exposure can reach identical object brightness afterwards.In like manner, first main sensitivity value of dodging intensity level 1422 correspondences of energy meter secondary series is ISO 200, and the main intensity of dodging shown in the secondary series corresponds to index value 144,145...159 successively.Same, these main intensity of dodging make the digital camera exposure all can reach identical object brightness afterwards.The main of other row that in like manner can obtain energy meter dodges intensity, thereby finishes the foundation of energy meter.
Next, in step 13, set up a preflashing table, as illustrated in table 3.At first, shown in preflashing table the first row and secondary series, at various distances, the default preflashing intensity of emission (identical), thereby obtain corresponding preflashing brightness value (substep 131).Then, use a basic sensitivity value (for example ISO 100), by near to the corresponding main intensity (substep 132) of dodging of record respectively at a distance, for example 282,560...2606.When main sudden strain of a muscle intensity reaches maximum main sudden strain of a muscle intensity (Max) (substep 133), when for example distance is 150 centimetres (cm), then increase the sensitivity value, and (according to table one) records corresponding index value (substep 134).As for not reaching maximum main each preceding distance of dodging intensity, for example 100 centimetres, 80 centimetres ... 20 centimetres, then according to (Fig. 2) energy meter, will lead and dodge intensity-conversion to corresponding index value (substep 135).For example, the main sudden strain of a muscle intensity that distance is 100 centimetres is 2606, it approximately corresponds to 2655 in (table 3) energy meter, dodges intensity 15000 (index value is 128) at a distance of six index values because itself and first are main, therefore obtain the main index value that dodges intensity 2606 and be 134 (=128+6).The master that in like manner can obtain other distances dodges the respective index value that intensity is converted to, as the table 2 center person of going out.By the foundation of aforementioned substep 131 to 135 described preflashing tables, dodge intensity and according to energy meter thereby obtain the corresponding main index value that dodges of each distance according to maximum main, make can reach identical object brightness after the digital camera exposure.
Fig. 2 shows the process flow diagram of the shooting of the embodiment of the invention.At first, in step 41, launch a preflashing intensity, with the preflashing brightness (step 42) that obtains returning.Then, in step 43, according to the preflashing brightness value that obtains, inquiry (table 3) preflashing table can reach the corresponding main index value that dodges according to interior difference method to obtain the main intensity (master dodges intensity if reached maximum, and then inquiry obtains the sensitivity value) (step 44) of dodging.By this, can make a video recording according to this.
If in the time of must changing the sensitivity value according to application demand (step 45), then must the set-up procedure 43 resulting main index values (step 46) that dodge.For example, suppose that (basis) original sensitivity value is ISO 100 (its respective index value is 128), and the resulting original main sudden strain of a muscle index value of step 43 is 128.If in response to change to new sensitivity value ISO 200 (its respective index value is 112=128-16) with demand, then new main dodge index value will be adjusted into 144 (=128+16).In other words, must meet following formula:
Original main index value+(original sensitivity value is corresponding) primary index value of dodging
=new main index value+(new sensitivity value is corresponding) new index value that dodges
Then, according to the new main index value (for example 144) that dodges, inquiry (table 2) energy meter is dodged intensity (step 47) to lead accordingly.By this, can make a video recording according to this.Accept above-mentioned example, because newly the main index value that dodges is adjusted to 144, can obtain main sudden strain of a muscle intensity through the inquiry energy meter is 1422.
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 technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1. the flash control method of a digital camera is characterized in that it comprises following steps:
Determine a plurality of index values, described index value corresponds to a plurality of sensitivity values respectively;
When the flashlamp of digital camera is beaten to maximum main flash intensity, and reach under the distance of object brightness, at described a plurality of sensitivity values, dodge intensity by little to obtaining a corresponding master greatly respectively, the object brightness that reaches after the feasible exposure is all identical, sets up by this and obtains an energy meter;
At a plurality of distances, emission one default preflashing intensity is to obtain corresponding a plurality of preflashing brightness value;
At described a plurality of distances, dodge intensity and according to this energy meter according to maximum main, to obtain corresponding a plurality of main index value that dodges, make that the object brightness that reaches after the above-mentioned exposure is all identical, set up by this and obtain a preflashing table; And
In when shooting, to be led sudden strain of a muscle intensity accordingly, wherein, the establishment step of above-mentioned preflashing table comprises according to this preflashing brightness value and this preflashing table:
At described a plurality of distances, use a basic sensitivity value, dodge intensity by near to recording corresponding master far respectively;
When this master dodges intensity when reaching this maximum master and dodging intensity, then increase this sensitivity value, and corresponding this index value of record; And
Do not dodge intensity this distance before at reaching this maximum master, according to this energy meter, should lead and dodge intensity-conversion to corresponding this index value.
2. the flash control method of digital camera according to claim 1 is characterized in that wherein in the deciding step of above-mentioned index value, this sensitivity value more corresponding this index value is littler.
3. the flash control method of digital camera according to claim 2 is characterized in that wherein in the deciding step of above-mentioned index value, this basis sensitivity value and this basis sensitivity value double fixedly be divided into 16 five equilibriums between the sensitivity value.
4. the flash control method of digital camera according to claim 3 is characterized in that wherein above-mentioned basic sensitivity value is ISO100.
5. the flash control method of digital camera according to claim 1 is characterized in that wherein first main intensity of dodging of above-mentioned energy meter is dodged intensity for this maximum master, and this sensitivity value of its correspondence is ISO100.
6. the flash control method of digital camera according to claim 1 is characterized in that wherein above-mentioned basic sensitivity value is ISO100.
7. the flash control method of digital camera according to claim 1 is characterized in that wherein in this shooting step, comprises more that this master dodges intensity to obtain accordingly with interior difference method.
8. the flash control method of digital camera according to claim 1 is characterized in that above-mentioned shooting step comprises:
According to this preflashing brightness value, inquire about this preflashing table to obtain an original main index value that dodges, wherein this original main corresponding original sensitivity value of index value of dodging.
9. the flash control method of digital camera according to claim 8 is characterized in that wherein more comprising after this shooting step:
Determine one to differ from the new sensitivity value of described original sensitivity value, and dodge intensity according to this energy meter to obtain the corresponding master of this new sensitivity value.
10. the flash control method of digital camera according to claim 8 is characterized in that wherein more comprising after this shooting step:
At a new sensitivity value that differs from described original sensitivity value, the corresponding new main index value that dodges that obtains, wherein should be original main that dodge index value and the corresponding index value of this original sensitivity value and equal this new main dodge index value and the corresponding index value of this new sensitivity value with; And
According to this new sensitivity value, this master dodges intensity to obtain accordingly to inquire about this energy meter.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4969045A (en) * | 1988-05-20 | 1990-11-06 | Sanyo Electric Co., Ltd. | Image sensing apparatus having automatic iris function of automatically adjusting exposure in response to video signal |
| US20030223010A1 (en) * | 2002-06-04 | 2003-12-04 | Michael Kaplinsky | Method and apparatus for automatic gain and exposure control for maintaining target image brightness in video imager systems |
| CN1797166A (en) * | 2004-12-30 | 2006-07-05 | 矽统科技股份有限公司 | Method for controlling exposure system |
| CN1811577A (en) * | 2005-12-19 | 2006-08-02 | 佛山普立华科技有限公司 | Method for regulating brightness of flash lamp |
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2010
- 2010-05-19 CN CN201010182065.4A patent/CN102253567B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4969045A (en) * | 1988-05-20 | 1990-11-06 | Sanyo Electric Co., Ltd. | Image sensing apparatus having automatic iris function of automatically adjusting exposure in response to video signal |
| US20030223010A1 (en) * | 2002-06-04 | 2003-12-04 | Michael Kaplinsky | Method and apparatus for automatic gain and exposure control for maintaining target image brightness in video imager systems |
| CN1797166A (en) * | 2004-12-30 | 2006-07-05 | 矽统科技股份有限公司 | Method for controlling exposure system |
| CN1811577A (en) * | 2005-12-19 | 2006-08-02 | 佛山普立华科技有限公司 | Method for regulating brightness of flash lamp |
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