CN1553274A - Automatic exposure electricity saving apparatus - Google Patents
Automatic exposure electricity saving apparatus Download PDFInfo
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- CN1553274A CN1553274A CNA031363032A CN03136303A CN1553274A CN 1553274 A CN1553274 A CN 1553274A CN A031363032 A CNA031363032 A CN A031363032A CN 03136303 A CN03136303 A CN 03136303A CN 1553274 A CN1553274 A CN 1553274A
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Abstract
A device is featured as the follows, an image brightness calculating unit is used to calculate image brightness value, maximum and minimum brightness allowable value set by central processing unit in image picking up unit is inputted separated to the first comparator and the second comparator, the first comparison signal of comparing image brightness with maximum allowable value is out putted by the first comparator and the second comparison signal of comparing image brightness with minimum allowable value is outputted by the second one in order that whether central processing unit is to be started up or not is decided by a gate or logic gate according to these two comparison signals.
Description
Technical field
The present invention relates to a kind of electricity saver, particularly a kind of automatic exposure electricity saver of image capture unit.
Background technology
With the progress of work numeral material skill and the lifting of quality of the life, each corner that the digitalized electron product has been gone into the thick of life, and digital camera is because of having than traditional camera that volume is little, easy to use, powerful, instant preview and exempt from afterwards to wash advantages such as photograph, therefore widely people use, and form to be life and the indispensable digital electronic product of out on tours.
General digital camera all can provide preview mode and automatic exposure (auto exposure) operator scheme, digital camera can be adjusted exposure parameters such as time shutter and yield value automatically according to present ambient brightness under auto exposure mode, make the user can take high-quality digital photo easily, and under preview mode, but the image that user's instant preview is captured is to be user-friendly for filming image; But when traditional digital camera is in auto exposure mode following time, the CPU (central processing unit) of digital camera (CPU) must be at any time according to present ambient brightness, calculate correct time shutter and yield value, power consumption is higher, has the disappearance that shortens the digital camera up time, thereby must carry more reserve battery or charge at any time, cause puzzlement and inconvenience in the use.
Summary of the invention
Fundamental purpose of the present invention provides a kind of automatic exposure electricity saver, it is to make the CPU of image capture unit in the ambient brightness scope that allows, be in the sleep for electricity saving state, when the brightness of external environment is crossed bright or excessively secretly need recomputate exposure parameter, restart CPU again according to present ambient brightness, the exposure parameter of calculating optimum, and enter the sleep for electricity saving pattern once again after CPU being calculated finish, and then have power saving, increase the advantage of service time.
Another object of the present invention is to propose a kind of automatic exposure electricity saver, makes image capture unit be in operating state at any time because of non-, and has long serviceable life.
According to the present invention, one automatic exposure electricity saver comprises an image brilliance computing unit, it is in order to calculate one by the obtained brightness value of image of image capture unit, and brightness value of image is inputed to first comparer and second comparer, to utilize first comparer that a brightness value of image and a high-high brightness allowable value that is set by the CPU of image capture unit are compared, and utilize second comparer that a brightness value of image and a minimum brightness allowable value that is set by CPU are compared simultaneously, and make first, second comparer is exported one first comparison signal and one second comparison signal to one or logic lock respectively, so that by or the logic lock according to the in addition computing and export an electric signal and judge whether this image brilliance surpasses this high-high brightness allowable value or be lower than this minimum brightness allowable value of this first and second comparison signal, and then whether decision starts this CPU.Illustrate in detail by the specific embodiment conjunction with figs. below, so that understand the present invention's purpose, technology contents, characteristics and the effect of being reached thereof easily.
Description of drawings
Fig. 1 is a structure block schematic diagram of the present invention.
Fig. 2 is an Application Example synoptic diagram of the present invention.
The figure number explanation:
10 automatic exposure electricity savers
12 image brilliance computing units
14 first comparers
16 second comparers
18CCD
20 analogy front-end processor
22 or the logic lock
24CPU
26 memory storages
28 control wafer
30 other circuit layouts
Embodiment
The present invention is by in an image capture unit inside one automatic exposure electricity saver being set, with the CPU of control image capture unit and the operating state of memory storage, this image capture unit is to can be camera heads such as digital camera, video camera and V8, will be the example explanation with the digital camera below.As shown in Figures 1 and 2, this automatic exposure electricity saver 10 comprises an image brilliance computing unit 12, it is to be connected with the CCD18 of digital camera, in order to calculate one by the obtained brightness value of image of this CCD18, image brilliance computing unit 12 and be connected again with first comparer 14 and second comparer 16, and with this brightness value of image input first, second comparer 14, in 16, wherein at first comparer 14, import a high-high brightness allowable value and a minimum brightness allowable value that sets by CPU in second comparer 16 respectively, and utilize 14 pairs of brightness value of image of first comparer and high-high brightness allowable value to compare, and export a brightness value of image whether greater than first comparison signal of high-high brightness allowable value, and utilize 16 pairs of brightness value of image of second comparer and minimum brightness allowable value to compare simultaneously, exporting a brightness value of image, and then adjust required time shutter and the yield value of this image of shooting automatically according to first and second comparison signal decision whether startup CPU whether less than second comparison signal of minimum luminance value.
Wherein, between automatic exposure electricity saver 10 and CCD18, be provided with an analogy front-end processor (AFE) 20, make the obtained image of CCD18 after analogy front-end processor 20 is handled, be resent to the image brilliance computing unit 12 of automatic exposure electricity saver 10 earlier, to carry out the calculating of image brilliance, and first, second comparison means 14,16 and be connected to one or logic lock 22, make or logic lock 22 foundations first, second comparison signal and computing are exported an electric signal and are judged that this brightness value of image is to be in allowing in the brightness range of setting, or surpass this high-high brightness allowable value (promptly too bright) or be lower than this minimum brightness allowable value (promptly too dark), again or the output terminal of logic lock 22 for being connected to CPU24, and CPU24 also is connected with a memory storage 26, this memory storage 26 SDRAM commonly used.
Wherein, when above-mentioned digital camera one enters auto exposure mode, promptly utilize CPU24 according to after ambient condition calculates a high-high brightness allowable value and minimum brightness allowable value at present earlier, enter a power saving dormant state immediately, so that save the electric power of CPU24 and memory storage 26, and when digital camera in preview mode following time, to judge through automatic exposure electricity saver 10 earlier by the obtained image of CCD18 at every turn, wherein when permissible range that image brilliance is setting be between high-high brightness allowable value and the minimum brightness allowable value time, then CPU24 will not be activated; And when image brilliance when too bright or too dark, then automatic exposure electricity saver 10 will restart CPU24, make CPU24 recomputate the time shutter and the yield value of this digital camera according to this too bright or too dark brightness value of image, and reset a new high-high brightness allowable value and a new minimum brightness allowable value according to time shutter and yield value simultaneously, and CPU24 also after setting is finished, enters the power saving dormant state once more.
Wherein, for making the present invention have characteristic easy to use, and with this automatic exposure electricity saver 10 and or logic lock 22 be incorporated on the control wafer 28, other circuit layouts 30 of control wafer also are integrated with the control function of control figure camera lens (Lens), memory body card (CF card) and display panels (LCD) preview.
In the present invention, utilize automatic exposure electricity saver 10 to make CPU24 and memory storage 26 in the ambient brightness scope that allows, be in the sleep for electricity saving state, and when external environment is crossed bright or be dark excessively, restart CPU again according to present ambient brightness, the design of the exposure parameter of calculating optimum, save electric power with CPU and memory storage are had and increase the advantage of service time, and because this CPU is non-is in operating condition for a long time thereby can has long serviceable life.
The above is preferred embodiment of the present invention only, is not to be used for limiting scope of the invention process.So all equalizations of doing according to the described shape of the present patent application claim, structure, feature and spirit change and modify, and all should be included in the claim of the present invention.
Claims (4)
1, a kind of automatic exposure electricity saver is characterized in that, under the auto exposure mode of an image capture unit, controls the operating state of the CPU (central processing unit) of this image capture unit, and this automatic exposure electricity saver comprises:
One image brilliance computing unit, it is to calculate one by the obtained brightness value of image of this image capture unit;
One first comparer and one second comparer, it is to be connected with this image brilliance computing unit, and this first comparer is the high-high brightness allowable value that sets in order to relatively this brightness value of image and this CPU (central processing unit), to export one first comparison signal, the minimum brightness allowable value that this second comparer then sets in order to relatively this brightness value of image and this CPU (central processing unit) is to export one second comparison signal; And
One or the logic lock, be connected to this first comparer and this second comparer, in order to the in addition computing and export an electric signal and judge whether this brightness value of image surpasses this high-high brightness allowable value or be lower than this minimum brightness allowable value of this first, second comparison signal, and then whether decision starts this CPU (central processing unit).
2, automatic exposure electricity saver as claimed in claim 1, it is characterized in that, the initial value of this high-high brightness allowable value and this minimum brightness allowable value is calculated by this CPU (central processing unit) when this image capture unit one enters this auto exposure mode, and this CPU (central processing unit) is calculated and entered a power saving dormant state immediately after finishing.
3, automatic exposure electricity saver as claimed in claim 1, it is characterized in that, after this CPU (central processing unit) starts, to recomputate a time shutter and a yield value of this image capture unit according to this brightness value of image, and reset this high-high brightness allowable value and this minimum brightness allowable value according to this time shutter and this yield value, and after setting was finished, this CPU (central processing unit) entered this power saving dormant state immediately.
4, automatic exposure electricity saver as claimed in claim 1 is characterized in that, this image capture unit can be selected from digital camera, video camera and V8 and take the photograph device mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031363032A CN1553274A (en) | 2003-05-26 | 2003-05-26 | Automatic exposure electricity saving apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031363032A CN1553274A (en) | 2003-05-26 | 2003-05-26 | Automatic exposure electricity saving apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1553274A true CN1553274A (en) | 2004-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031363032A Pending CN1553274A (en) | 2003-05-26 | 2003-05-26 | Automatic exposure electricity saving apparatus |
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| Country | Link |
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| CN (1) | CN1553274A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510960A (en) * | 2009-03-26 | 2009-08-19 | 北京中星微电子有限公司 | Mobile phone camera shooting method and apparatus |
-
2003
- 2003-05-26 CN CNA031363032A patent/CN1553274A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510960A (en) * | 2009-03-26 | 2009-08-19 | 北京中星微电子有限公司 | Mobile phone camera shooting method and apparatus |
| CN101510960B (en) * | 2009-03-26 | 2014-06-25 | 北京中星微电子有限公司 | Mobile phone camera shooting method and apparatus |
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