CN100389362C - Exposure regulating method and device - Google Patents
Exposure regulating method and device Download PDFInfo
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- CN100389362C CN100389362C CNB2005100631122A CN200510063112A CN100389362C CN 100389362 C CN100389362 C CN 100389362C CN B2005100631122 A CNB2005100631122 A CN B2005100631122A CN 200510063112 A CN200510063112 A CN 200510063112A CN 100389362 C CN100389362 C CN 100389362C
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- brightness value
- dutycycle
- time shutter
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Abstract
The present invention discloses a super close distance exposure control method and a device for an image pick-up device with an LED light source. The image pick-up device does not have the function of adjusting diaphragms, and the method comprises the steps that a brightness value of an image acquired by the image pick-up device is determined; if the brightness value is bigger than a first numerical value, the image is overexposed; exposure parameters are adjusted under the condition of overexposure. Through the automatic adjustment of the two parameters of exposure time and duty ratios, the present invention effectively avoids the problem that images are blurry due to dithering when the images are picked up, increases the quality of the images and saves electric energy.
Description
Technical field
The present invention relates to exposure regulating method and device, particularly relate to the exposure regulating method and the device of the camera head that is used to adopt led light source picture quality.
Background technology
A lot of mobile phones have been equipped with camera, can take pictures, but the camera that disposes on the regular handset are generally fairly simple, are not with the aperture regulatory function, and wherein some mobile phone also has been equipped with the LED lamp as the floor light light source.General LED has two states, i.e. opening and closing are corresponding to the on and off of lamp.But the mode of operation of these LED lamps is more limited, comprises that mainly automatic flash mode, pressure flash mode, lasting light illumination mode etc. are several.Automatically under flash mode and the pressure flash mode, LED all is in closed condition before taking pictures.Under automatic flash mode, take pictures in a flash according to ambient brightness decision glittering LED lamp whether.Forcing under the flash mode, regardless of ambient brightness, the always glittering in a flash LED lamp of taking pictures.Under lasting light illumination mode, to finish to taking pictures when before taking pictures, finding a view, the LED lamp is in opening always.
Three kinds of mode of operations of above-mentioned LED lamp can be dealt with taking pictures under most of environmental baselines, but some limitation is still arranged.Because it is hand-held that regular handset was generally when taking, so the shake of hand has negative effect to image quality.In the super close distance less than 10cm, if the time shutter is long, very little shake all can cause image blurring.Be generally fixed value because the LED lamp is opened the back intensity of illumination again, and can not come flexible by actual needs, this causes waste of electric energy.
Summary of the invention
One of purpose of the present invention is, causes image blurring problem because of shake when solving the camera head shooting of adopting led light source; Two of purpose is, solves that led light source opens that the back intensity of illumination is fixed and the problem of the electricity wasting that causes.
According to a first aspect of the invention, a kind of super close distance exposure regulating method that is used to adopt the camera head of led light source is provided, described camera head does not have the aperture regulatory function, and this method comprises: the 1) image that collects for camera head, determine its brightness value; 2) if brightness value greater than first numerical value, then over-exposed; 3) under over-exposed situation, regulate exposure parameter.
In first aspect, preferably, described exposure parameter is the time shutter, and the step of described adjusting exposure parameter comprises and reduces the time shutter.
Preferably, when the time shutter is reduced to first predetermined value, reduce dutycycle.
Preferably, described step 2) comprise, if brightness value less than second value, then under-exposed, wherein second value is less than first numerical value; Under the situation of under-exposure, improve dutycycle.
Preferably, described exposure parameter is a dutycycle, and the step of described adjusting exposure parameter comprises the reduction dutycycle.
Preferably, wherein when dutycycle is reduced for second predetermined value, reduce the time shutter.
Preferably, described step 2) comprise, if brightness value less than second value, then under-exposed, wherein second value is less than first numerical value; Under the situation of under-exposure, increase the time shutter.
Preferably, described brightness value is an average brightness value.
According to a second aspect of the invention, a kind of super close distance exposure adjusting device that is used to adopt the camera head of led light source is provided, this camera head does not have the aperture regulatory function, described exposure adjusting device comprises: brightness value is determined device, be used for image that camera head is collected, determine its brightness value; Compare to determine device,, then judge over-exposed if be used for brightness value greater than first numerical value; The exposure parameter regulating device is used under over-exposed situation, regulates exposure parameter.
In second aspect, preferably, described exposure parameter is the time shutter, and described exposure parameter regulating device is used to reduce the time shutter.
Preferably, described exposure parameter is a dutycycle, and described exposure parameter regulating device is used to reduce dutycycle.
The present invention can be preferentially at the needs of anti-jitter, the exposure parameter when finding a view provides a control method.Because of the time shutter long more, hand that shake caused was image blurring serious more, when regulating, preferentially reduce the time shutter so, can eliminate the negative effect that the shake of hand brings image quality.Less important needs at power saving, less important consideration reduces dutycycle when regulating, and utilizes the reduction duty recently to reduce the intensity of illumination of led light source according to actual needs, thereby reaches purpose of power saving.The present invention also can preferentially reduce dutycycle preferentially at the needs of power saving when regulating, less important needs at anti-jitter reduce the time shutter.In a word, the present invention is by automatically regulating time shutter and these two parameters of dutycycle, when having avoided effectively taking because of shake cause image blurring, improved picture quality, and saved electric energy.
Description of drawings
Fig. 1 illustrates the process flow diagram of the exposure regulating method of an embodiment of the present invention.
Fig. 2 illustrates the process flow diagram of the exposure regulating method of another embodiment of the present invention.
Wherein identical Reference numeral is used for representing same technical characterictic.For understanding the present invention better, the invention will be further described below in conjunction with the drawings and specific embodiments.
Embodiment
Because of the camera that disposes on the regular handset generally all fairly simple, be not with the aperture regulatory function, so the camera head that following embodiment relates to is not with the aperture regulatory function, be applicable on the mobile phone that adopts led light source illumination, band camera, to super close distance as taking pictures less than the object of 10cm from camera lens.Can adopt a kind of pulse control method, utilize duty of ratio to regulate the brightness of led light source, make led light source under bright state, can programme continuously, regulate smoothly its brightness.Thereby make that led light source extinguishes when dutycycle is 0; Dutycycle is 1 o'clock, and led light source reaches the brightest state; When dutycycle changed between 0 and 1, the brightness of led light source was also along with variation.
With reference to Fig. 1, Fig. 1 illustrates the process flow diagram of the exposure regulating method of an embodiment of the present invention.In step 10, dutycycle is made as 1, perseverance is a high level, lights led light source, the brightness of led light source is for the brightest at this moment; To the time shutter be set at Tmax, as 1/60 second, like this time shutter the longest can not be above 1/60 second.In step 20, brightness value determine device to camera collection to image carry out brightness analysis, obtain brightness value such as average brightness value avgL, brightness value also can be other brightness values here, as weighting brightness value etc.In step 30, compare to determine device and judge that whether average brightness value avgL is at some predefined allowed band (L1, L2) in, here the preferred value of second value L1 is 100, the preferred value of the first numerical value L2 is 150, as in the scope of (100,150), then judge the exposure appropriateness, finish the exposure adjustment process in step 40.
Judgement is over-exposed if average brightness value avgL, compares to determine device greater than L2, and in step 50, the exposure parameter regulating device reduces the time shutter.In step 60, if the time shutter reduces to the first predetermined value Tmin, Tmin is preferably 1/200 second, and in step 70, the exposure parameter regulating device reduces dutycycle; And if the time shutter greater than the first predetermined value Tmin, execution in step 20.In step 80, if dutycycle is 0, then execution in step 40 finishes exposure process, otherwise execution in step 20.
Judge under-exposure if average brightness value avgL, then compares to determine device less than L1, improve dutycycle in step 90.In step 100, judge whether dutycycle is 1, as be 1 and under existing condition, reached best condition that execution in step 40 finishes exposure process; Otherwise execution in step 20.
This embodiment preferentially reduces the time shutter when exposing and regulating, always select to reduce the time shutter whenever possible, and the time shutter is the longest can not to surpass predetermined value Tmax, and as 1/60 second, and the time shutter was short more favourable more.In step 10, also can be made as other values except that Tmax the time shutter.For common user, the time shutter drops to certain value Tmin as after 1/200 second, takes the vestige that the image that comes is not just seen fuzzy shake at super close distance.Less important consideration reduces dutycycle during adjusting.
With reference to Fig. 2, Fig. 2 illustrates the process flow diagram of the exposure regulating method of another embodiment of the present invention.In step 10, dutycycle is made as 1, perseverance is a high level, lights led light source; To be set at a certain predetermined value t the time shutter, typically t can be made as 1/60 second.In step 20, brightness value determine device to camera collection to image carry out brightness analysis, obtain its brightness value such as average brightness value avgL, brightness value also can be other brightness values here, as weighting brightness value etc.In step 30, judge that whether average brightness value avgL is at some predefined allowed band (L1, L2) in, here the preferred value of second value L1 is 100, the preferred value of the first numerical value L2 is 150, as in the scope of (100,150), then compare to determine device and judge the exposure appropriateness, finish the exposure adjustment process in step 40.
Judgement is over-exposed if average brightness value avgL, then compares to determine device greater than L2, and in step 51, the exposure parameter regulating device reduces dutycycle, thereby reduces the brightness of led light source.In step 61, judge whether dutycycle reduces to second predetermined value, preferably, second predetermined value is 0, if dutycycle is 0, perseverance is a low level, then reduces the time shutter in step 71, otherwise execution in step 20.
Judge under-exposure if average brightness value avgL, then compares to determine device less than L1, increase the time shutter in step 81.In step 91, if the time shutter greater than predetermined value Tmax, Tmax was generally 1/60 second, then execution in step 40 finishes the exposure adjustment processes, otherwise execution in step 20.
Different with last embodiment is that this embodiment exposes and is primarily aimed at the needs of power saving when regulating, and pays the utmost attention to the reduction dutycycle, always selects whenever possible to reduce dutycycle, reduces the time shutter when dutycycle reduces to 0.
Preamble is an example with the mobile phone that is used to camera, the description of property that the invention has been described.In addition, the present invention also can be used for the flash memory device of business card scan device, band camera etc., and this is obvious to those skilled in the art.
Obviously, the present invention described here can have many variations, and this variation can not be thought and departs from the spirit and scope of the present invention.Therefore, the change that all it will be apparent to those skilled in the art all is included within the covering scope of these claims.
Claims (11)
1. exposure regulating method in 10 cm distance of a camera head that is used to adopt led light source, described camera head does not have the aperture regulatory function, and this method comprises:
1) image that collects for camera head is determined its brightness value;
2) if brightness value greater than first numerical value, then over-exposed;
3) under over-exposed situation, regulate time shutter and dutycycle.
2. according to the described exposure regulating method of claim 1, described regulating step preferentially reduces the time shutter.
3. according to the described exposure regulating method of claim 2, when the time shutter is reduced to first predetermined value, reduce dutycycle.
4. according to the described exposure regulating method of claim 3, described step 2) comprise, if brightness value less than second value, then under-exposed, wherein second value is less than first numerical value; Under the situation of under-exposure, improve dutycycle.
5. according to the described exposure regulating method of claim 1, described regulating step preferentially reduces dutycycle.
6. according to the described exposure regulating method of claim 5, wherein when dutycycle is reduced for second predetermined value, reduce the time shutter.
7. according to the described exposure regulating method of claim 6, described step 2) comprise, if brightness value less than second value, then under-exposed, wherein second value is less than first numerical value; Under the situation of under-exposure, increase the time shutter.
8. according to each described exposure regulating method in the claim 1 to 7, described brightness value is an average brightness value.
9. exposure adjusting device in 10 cm distance of a camera head that is used to adopt led light source, this camera head does not have the aperture regulatory function, and described exposure adjusting device comprises:
Brightness value is determined device, is used for image that camera head is collected, determines its brightness value;
Compare to determine device,, then judge over-exposed if be used for brightness value greater than first numerical value;
The exposure parameter regulating device is used under over-exposed situation, regulates time shutter and dutycycle.
10. according to the described exposure adjusting device of claim 9, described exposure parameter regulating device is used for preferentially reducing the time shutter.
11. according to the described exposure adjusting device of claim 9, described exposure parameter regulating device is used for preferentially reducing dutycycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100631122A CN100389362C (en) | 2005-04-04 | 2005-04-04 | Exposure regulating method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100631122A CN100389362C (en) | 2005-04-04 | 2005-04-04 | Exposure regulating method and device |
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| Publication Number | Publication Date |
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| CN1655041A CN1655041A (en) | 2005-08-17 |
| CN100389362C true CN100389362C (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100631122A Expired - Fee Related CN100389362C (en) | 2005-04-04 | 2005-04-04 | Exposure regulating method and device |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7825969B2 (en) * | 2006-12-15 | 2010-11-02 | Nokia Corporation | Image stabilization using multi-exposure pattern |
| CN101241294B (en) * | 2007-02-06 | 2010-09-01 | 亚洲光学股份有限公司 | Camera shooting control method and its device |
| CN101334524B (en) * | 2007-06-29 | 2011-03-23 | 北京华旗资讯数码科技有限公司 | Method for automatically controlling digital microscope light source |
| CN100563306C (en) * | 2007-07-25 | 2009-11-25 | 北京中星微电子有限公司 | A kind of camera head light filling lamp autocontrol method and device |
| CN101577791B (en) * | 2008-05-07 | 2011-01-12 | 华晶科技股份有限公司 | Digital image processing method for correcting handshake fuzziness |
| CN102314044A (en) * | 2010-07-02 | 2012-01-11 | 原相科技股份有限公司 | Distance measuring system and method |
| CN102377947B (en) * | 2011-09-02 | 2013-11-20 | 深圳市先河***技术有限公司 | Exposure control device and method |
| CN102830573B (en) | 2012-09-10 | 2015-08-19 | 华为终端有限公司 | A kind of flash control method and device |
| CN107613190B (en) * | 2016-07-11 | 2020-11-03 | 中兴通讯股份有限公司 | Photographing method and terminal |
| CN113395457B (en) * | 2020-03-11 | 2023-03-24 | 浙江宇视科技有限公司 | Parameter adjusting method, device and equipment of image collector and storage medium |
| CN116055889A (en) * | 2023-02-16 | 2023-05-02 | 瀚湄信息科技(上海)有限公司 | Endoscope device and method for automatically adjusting exposure and realizing global rolling shutter |
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| JP2002277920A (en) * | 2001-03-14 | 2002-09-25 | Fuji Photo Film Co Ltd | Exposure control method and photographing device |
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| JP2004347757A (en) * | 2003-05-21 | 2004-12-09 | Nikon Corp | Camera and multiple flashes photographing system of camera |
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2005
- 2005-04-04 CN CNB2005100631122A patent/CN100389362C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0750775A (en) * | 1993-08-09 | 1995-02-21 | Hitachi Ltd | Vtr incorporated type video camera |
| JP2002277920A (en) * | 2001-03-14 | 2002-09-25 | Fuji Photo Film Co Ltd | Exposure control method and photographing device |
| JP2003338973A (en) * | 2002-03-15 | 2003-11-28 | Sharp Corp | Portable device having imaging function |
| JP2004347757A (en) * | 2003-05-21 | 2004-12-09 | Nikon Corp | Camera and multiple flashes photographing system of camera |
| CN2639926Y (en) * | 2003-07-31 | 2004-09-08 | 上海海鸥数码影像股份有限公司 | Digital camera autoamtic exposure circuit |
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| CN1655041A (en) | 2005-08-17 |
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