CN100380226C - Automatic exposure method for digital cameras - Google Patents
Automatic exposure method for digital cameras Download PDFInfo
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- CN100380226C CN100380226C CNB031425496A CN03142549A CN100380226C CN 100380226 C CN100380226 C CN 100380226C CN B031425496 A CNB031425496 A CN B031425496A CN 03142549 A CN03142549 A CN 03142549A CN 100380226 C CN100380226 C CN 100380226C
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- electronic shutter
- step number
- digital still
- still camera
- flow rate
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Abstract
The present invention relates to an automatic exposure method for a digital camera, which is suitable for adjusting an electronic shutter on a digital camera. The method comprises the following steps that average brightness is measured; the step number of the electronic shutter needing adjusting is checked by a built-in table according to the average brightness, and whether the step number of the electronic shutter needing adjusting exceeds the step number of the maximum adjustable electronic shutter or not is judged; if the step number of the electronic shutter needing adjusting exceeds the step number of the maximum adjustable electronic shutter, then the electronic shutter is adjusted by the step number of the maximum adjustable electronic shutter; if the step number of the electronic shutter needing adjusting does not exceed the step number of the maximum adjustable electronic shutter, then the electronic shutter is adjusted by the step number of the electronic shutter needing adjusting; the electronic shutter is fine adjusted. The method checks steps causing the digital camera to learn the step number of the electronic shutter needing adjusting learned in a short time, saving the operation time of the digital camera, and reducing rough adjustment according to the built-in table which is set in the digital camera after an average brightness value is measured.
Description
Technical field
The present invention relates to the method for the automatic exposure of the digital still camera in a kind of instrument field camera or the equipment, particularly relate to a kind of after recording average brightness value, according to the interior in-built meter that is built in digital still camera, check in the electronic shutter step number that can make digital still camera learn required adjustment at short notice, and the method for automatic exposure of digital still camera that can save the operation time of digital still camera and reduce the step of coarse adjustment.
Background technology
In the numerical digit camera, if come filmed image with 1024 * 768 picture elements, and the brightness range of each picture element is 0 to 255, then how to photograph the picture of best mean flow rate, just become present urgent problem.
Seeing also shown in Figure 3ly, is the method flow diagram of the exposure of existing known a kind of digital still camera.Should have the method for the exposure of known digital still camera now, it may further comprise the steps: digital still camera come into operation (S302), secondly digital still camera records the mean flow rate (S304) of the picture that is comprised in its camera lens, and then digital still camera then judges according to this mean flow rate whether it levels off to predefined object brightness (S306) in the digital still camera.If mean flow rate levels off to object brightness, then digital still camera enters fine setting program (S308); Otherwise, if mean flow rate does not level off to object brightness and then adjusts electronic shutter in the mode of adjusting an electronic shutter step, until leveling off to (S310) till the object brightness.
Comprehensive the above, the method for the exposure of existing known digital still camera, for once only adjusting an electronic shutter step, it is slow and lose time to have caused existing known digital still camera to adjust the speed of electronic shutter.
This shows that the method for the exposure of above-mentioned existing digital still camera still has many defectives, and demands urgently further being improved.
For the defective of the method for the exposure that solves existing digital still camera, relevant manufacturer there's no one who doesn't or isn't seeks the road that solves 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 that the method for the exposure of above-mentioned existing digital still camera exists, 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, method in the hope of the automatic exposure of founding a kind of new digital still camera, can improve the general method of the exposure of existing digital still camera on the market, 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 the method for the exposure of above-mentioned existing digital still camera exists, and provide a kind of method of automatic exposure of new digital still camera, technical problem underlying to be solved is that it is once calculated by the electronic shutter step number of formula with the required adjustment of coarse adjustment, to be built in the digital still camera in the data of calculating then, therefore after recording mean flow rate, promptly can lean on lookup table mode that the electronic shutter step number of the required adjustment of coarse adjustment is chosen, and can increase the arithmetic speed of automatic exposure.
Another object of the present invention is to, a kind of method of automatic exposure of digital still camera is provided, technical matters to be solved is to make it after photometry finishes, and can learn average brightness value by the interior in-built meter that is built in digital still camera, and can save the time of digital still camera computing.
Purpose of the present invention and to solve its technical problem underlying be to adopt following technical scheme to realize.The method of the automatic exposure of a kind of digital still camera that proposes according to the present invention is applicable to an electronic shutter of adjusting on the digital still camera, and this method may further comprise the steps: record a mean flow rate of desiring to be taken picture; Check in the electronic shutter step number of a required adjustment by an in-built meter according to this mean flow rate, and judge whether surpass the whole electronic shutter step number of a maximum adjustable, the electronic shutter step number of wherein said required adjustment is the required electronic shutter step number of mean flow rate that described mean flow rate is adjusted to a desirable image; If surpass the whole electronic shutter step number of this maximum adjustable, then adjust with the whole electronic shutter step number of this maximum adjustable; If do not surpass the whole electronic shutter step number of this maximum adjustable, then adjust with the electronic shutter step number of this required adjustment; And enter fine setting.
The object of the invention to solve the technical problems can also be further achieved by the following technical measures.
The method of the automatic exposure of aforesaid digital still camera, the electronic shutter step number of wherein said required adjustment on the occasion of the time represent need to increase the time shutter.
The method of the automatic exposure of aforesaid digital still camera, the electronic shutter step number of wherein said required adjustment are represented during for negative value to need to reduce the time shutter.
The method of the automatic exposure of aforesaid digital still camera, wherein said in-built meter are built in this digital still camera in being.
The method of the automatic exposure of aforesaid digital still camera, wherein said in-built meter comprise the electronic shutter step number of this mean flow rate, this required adjustment, the mean flow rate and an electronic shutter step number of a desirable image.
Purpose of the present invention and solve its technical problem underlying and also realize by the following technical solutions.The method of the automatic exposure of a kind of digital still camera that proposes according to the present invention is applicable to an electronic shutter of adjusting on the digital still camera, and this method may further comprise the steps: record a mean flow rate; Check in the electronic shutter step number of a required adjustment according to this mean flow rate by an in-built meter, and judge whether surpass the whole electronic shutter step number of a maximum adjustable; If surpass the whole electronic shutter step number of this maximum adjustable, then adjust with the whole electronic shutter step number of this maximum adjustable; If do not surpass the whole electronic shutter step number of this maximum adjustable, then adjust with the electronic shutter step number of this required adjustment; And enter fine setting.
The object of the invention to solve the technical problems can also be further achieved by the following technical measures.
The method of the automatic exposure of aforesaid digital still camera, the electronic shutter step number of wherein said required adjustment on the occasion of the time represent need to increase the time shutter.
The method of the automatic exposure of aforesaid digital still camera, the electronic shutter step number of wherein said required adjustment are represented during for negative value to need to reduce the time shutter.
The method of the automatic exposure of aforesaid digital still camera, wherein said in-built meter are built in this digital still camera in being.
The method of the automatic exposure of aforesaid digital still camera, wherein said in-built meter comprise the electronic shutter step number of this mean flow rate, this required adjustment, the mean flow rate and an electronic shutter step number of a desirable image.
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, the present invention proposes a kind of method of automatic exposure of digital still camera, is to be used for adjusting electronic shutter on the digital still camera for design.
According to preferred embodiment of the present invention, above-mentioned method is: digital still camera at first records the mean flow rate of the picture that is comprised in its camera lens, then according to mean flow rate to the digital still camera built-in in-built meter, check in when this mean flow rate, the electronic shutter step number of the required adjustment of digital still camera judges then whether the electronic shutter step number of required adjustment surpasses the whole electronic shutter step number of maximum adjustable.When the electronic shutter step number of required adjustment was put in order the electronic shutter step number above maximum adjustable, then digital still camera was promptly adjusted electronic shutter with the whole electronic shutter step number of maximum adjustable; Otherwise, if when the electronic shutter step number of required adjustment is put in order the electronic shutter step number above maximum adjustable, then adjust electronic shutter with the electronic shutter step number of required adjustment.At last, digital still camera promptly enters fine setting.
According to preferred embodiment of the present invention, the electronic shutter step number of above-mentioned required adjustment on the occasion of the time represent need to increase the time shutter.Otherwise the electronic shutter step number of required adjustment is represented during for negative value to need to reduce the time shutter.
According to preferred embodiment of the present invention, above-mentioned in-built meter is built in digital still camera in being, and in-built meter includes the mean flow rate and the electronic shutter step number of the electronic shutter step number of mean flow rate, required adjustment, desirable image.
According to preferred embodiment of the present invention, above-mentioned electronic shutter step number is for adjusting the least unit of time shutter.The whole electronic shutter step number of maximum adjustable then is the allowed maximum electronic shutter step number of adjustment time shutter between continuous two pictures, also is under the situation of considering not make picture produce acute variation, once the step number that can adjust.
According to preferred embodiment of the present invention, the electronic shutter step number of above-mentioned required adjustment is for being adjusted to the required electronic shutter step number of mean flow rate of desirable image by measured mean flow rate.
By said structure, the method of the automatic exposure of digital still camera of the present invention, its advantage is for once to calculate by the electronic shutter step number of formula with the required adjustment of coarse adjustment, to be built in the digital still camera in the data of calculating then, therefore after recording mean flow rate, promptly can lean on lookup table mode that the electronic shutter step number of the required adjustment of coarse adjustment is chosen, and can increase the arithmetic speed of automatic exposure greatly.
In addition, the method for the automatic exposure of digital still camera of the present invention after photometry finishes, can be learnt average brightness value by the interior in-built meter that is built in digital still camera, and can save the time of digital still camera computing.
In sum, the method of the automatic exposure of the digital still camera that the present invention is special, be after recording average brightness value, according to the interior in-built meter that is built in digital still camera, check in the electronic shutter step number that can make digital still camera learn required adjustment at short notice, and can save the operation time of digital still camera and the step that reduces coarse adjustment.It has above-mentioned plurality of advantages and practical value, on method, really belong to innovation, the exposure method of more existing digital still camera has the multinomial effect of enhancement, no matter bigger improvement is all being arranged on the method or on the function, and have than much progress technically, and produced handy and practical effect, and have the effect of enhancement really, thereby being suitable for practicality more, really is 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.
Description of drawings
Fig. 1 is the method flow diagram according to the automatic exposure of a kind of digital still camera of a preferred embodiment of the present invention.
Fig. 2 is the in-built meter according to the automatic exposure technology of a kind of digital still camera of a preferred embodiment of the present invention.
Fig. 3 is the method flow diagram that has the exposure of known a kind of digital still camera now.
Graphic sign explanation:
S102～S114: each steps flow chart
S302～S310: each steps flow chart
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, its concrete grammar of method, step, feature and the effect thereof of the automatic exposure of the digital still camera that foundation the present invention is proposed, describe in detail as after.
The explanation of present embodiment for convenience is so define a plurality of nouns and its conventional letter at this earlier.In the present embodiment, target average brightness (T
Y) be the mean flow rate of desirable image.Electronic shutter step number (E
Step) be the least unit of adjusting the time shutter, as be familiar with this skill person and can know easily, it for example is 1/8EV or 1/16EV, but not as limit.Mean flow rate (Y
Ave) for comprising the mean flow rate of picture in the digital still camera lenses.Maximum adjustable is put in order electronic shutter step number (MAX E
Step) be the allowed maximum electronic shutter step number of adjustment time shutter between continuous two pictures (frame), also be and considering that picture changes under the only acute situation the once adjustment step number of being allowed.Electronic shutter step number (the AE of required adjustment
Step) for measured mean flow rate being adjusted to the required electronic shutter step number of mean flow rate of desirable image.
Seeing also shown in Figure 1ly, is the method flow diagram according to the automatic exposure of a kind of digital still camera of a preferred embodiment of the present invention.As shown in Figure 1, method according to the automatic exposure of a kind of digital still camera of preferred embodiment of the present invention, it may further comprise the steps: digital still camera comes into operation (S102), and secondly digital still camera at first records the mean flow rate (S104) of the picture that is comprised in its camera lens.Then, according to mean flow rate to the digital still camera built-in in-built meter, check in when this mean flow rate the electronic shutter step number (S106) of the required adjustment of digital still camera.
Then seeing also shown in Figure 2ly, is the in-built meter according to the automatic exposure technology of a kind of digital still camera of a preferred embodiment of the present invention.This in-built meter has comprised mean flow rate (Y
Ave), the electronic shutter step number (AE of required adjustment
Step), target average brightness (T
Y) and electronic shutter step number (E
Step).The in-built meter of Fig. 2 records mean flow rate (Y for providing when digital still camera
Ave) after, promptly to electronic shutter step number (E
Step) in the in-built meter that conforms to, seek the value that conforms to mean flow rate, can obtain the electronic shutter step number (AE of required adjustment
Step).And the foundation of each numerical value of in-built meter can be calculated by following formula:
AE
Step＝(1/E
Step)*log
2(T
Y/Y
ave)
Please continue to consult shown in Figure 1, and then digital still camera judges that whether the electronic shutter step number of required adjustment surpasses the whole electronic shutter step number (S108) of maximum adjustable.When the electronic shutter step number of the required adjustment of digital still camera was put in order the electronic shutter step number above maximum adjustable, then digital still camera was promptly adjusted electronic shutter (S114) with the whole electronic shutter step number of maximum adjustable; Otherwise, if when the electronic shutter step number of the required adjustment of digital still camera is put in order the electronic shutter step number above maximum adjustable, then adjust electronic shutter (S110) with the electronic shutter step number of required adjustment.At last, digital still camera promptly enters fine setting (S112).
In preferred embodiment of the present invention, the electronic shutter step number of required adjustment on the occasion of the time represent that digital still camera need increase the time shutter.Otherwise, represent then when the electronic shutter step number of required adjustment is negative value that digital still camera need reduce the time shutter.
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 (5)
1. the method for the automatic exposure of a digital still camera is applicable to an electronic shutter of adjusting on the digital still camera, it is characterized in that this method may further comprise the steps:
Record a mean flow rate of desiring to be taken picture;
Check in the electronic shutter step number of a required adjustment by an in-built meter according to this mean flow rate, and judge whether surpass the whole electronic shutter step number of a maximum adjustable, the electronic shutter step number of wherein said required adjustment is the required electronic shutter step number of mean flow rate that described mean flow rate is adjusted to a desirable image;
If surpass the whole electronic shutter step number of this maximum adjustable, then adjust with the whole electronic shutter step number of this maximum adjustable;
If do not surpass the whole electronic shutter step number of this maximum adjustable, then adjust with the electronic shutter step number of this required adjustment; And
Enter fine setting.
2. the method for the automatic exposure of digital still camera according to claim 1, the electronic shutter step number that it is characterized in that wherein said required adjustment on the occasion of the time represent to need to increase the time shutter.
3. the method for the automatic exposure of digital still camera according to claim 1, the electronic shutter step number that it is characterized in that wherein said required adjustment are represented to need to reduce the time shutter during for negative value.
4. the method for the automatic exposure of digital still camera according to claim 1 is characterized in that wherein said in-built meter is built in this digital still camera in being.
5. the method for the automatic exposure of digital still camera according to claim 1 is characterized in that wherein said in-built meter comprises the electronic shutter step number of this mean flow rate, this required adjustment, the mean flow rate and an electronic shutter step number of a desirable image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031425496A CN100380226C (en) | 2003-06-13 | 2003-06-13 | Automatic exposure method for digital cameras |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031425496A CN100380226C (en) | 2003-06-13 | 2003-06-13 | Automatic exposure method for digital cameras |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1567081A CN1567081A (en) | 2005-01-19 |
| CN100380226C true CN100380226C (en) | 2008-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031425496A Expired - Fee Related CN100380226C (en) | 2003-06-13 | 2003-06-13 | Automatic exposure method for digital cameras |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373927C (en) * | 2005-03-21 | 2008-03-05 | 王美娟 | Automatic exposure method for digital photographic device |
| CN105338235B (en) * | 2014-07-28 | 2018-11-20 | 华为技术有限公司 | A kind of automatic aperture adjusting method and device |
| CN106982333B (en) * | 2017-05-12 | 2020-03-27 | 深圳怡化电脑股份有限公司 | Method, device and equipment for quickly correcting image sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010035098A1 (en) * | 2000-04-27 | 2001-11-01 | Genfa Peng | Non-soot Chinese pan for stir-frying |
| US20020064297A1 (en) * | 1999-11-22 | 2002-05-30 | Hugh Brunk | Adjusting an electronic camera to acquire an image |
| JP2002232771A (en) * | 2001-01-30 | 2002-08-16 | Seiko Instruments Inc | Digital camera |
-
2003
- 2003-06-13 CN CNB031425496A patent/CN100380226C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020064297A1 (en) * | 1999-11-22 | 2002-05-30 | Hugh Brunk | Adjusting an electronic camera to acquire an image |
| US20010035098A1 (en) * | 2000-04-27 | 2001-11-01 | Genfa Peng | Non-soot Chinese pan for stir-frying |
| JP2002232771A (en) * | 2001-01-30 | 2002-08-16 | Seiko Instruments Inc | Digital camera |
Non-Patent Citations (4)
| Title |
|---|
| A new automatic exposure system for digital still cameras. Tetsuya Kuno，Hiroaki Sugiura，Narihiro Matoba.IEEE Transactions on Consumer Electronics,Vol.44 No.1. 1998 * |
| CCD光电转换的自动曝光技术. 许世文，于洪利，王岩.哈尔滨工业大学学报，第23卷第5期. 1991 * |
| 摄影 照相机快门 时间的测定. 俞儒庆，廖健.仪器仪表标准化与计量，第5期. 2002 * |
| 现代相机自动曝光的附助功能. 关文俊，和亮.哈尔滨师范大学自然科学学报，第17卷第1期. 2001 * |
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