CN1239028C - White balancing device and method for automatic flash lamp of digital camera - Google Patents
White balancing device and method for automatic flash lamp of digital camera Download PDFInfo
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- CN1239028C CN1239028C CN 01134501 CN01134501A CN1239028C CN 1239028 C CN1239028 C CN 1239028C CN 01134501 CN01134501 CN 01134501 CN 01134501 A CN01134501 A CN 01134501A CN 1239028 C CN1239028 C CN 1239028C
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- voltage signal
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Abstract
The present invention relates to a device and a method for white balance of an automatic flash light of a digital camera. In the device, the digital camera is provided with an image sensor and a flash light module, wherein the image sensor is used for sensing exterior images; the flash light module stops emitting light when the flash light module emits flash light and a first voltage signal representing the detected light brightness is larger than a reference voltage signal. The present invention sets an exposure time according to the image brightness sensed by the image sensor and detects the light brightness by using the flash light module according to the exposure time to establish a second voltage signal so as to set and adjust the white balance on the basis of the specific value of the reference voltage signal and the second voltage signal.
Description
Technical field
The invention belongs to a kind of white balancing apparatus of camera, especially refer to a kind of automatic flash light white balancing apparatus and method thereof of digital camera.
Background technology
The color of an object is determined by two factors: the selective reflecting spectrum of this object, and with the light source light spectrum in this object environment of living in.So under different light source irradiation, identical object can have different colors.Therefore, the Automatic white balance function that digital camera provided promptly is in order to solve in the environment of different-colour light source, still to make taken image still can present the color in unanimity.
In order to want Auto-Sensing or to estimate out light source in the environment, there is solution miscellaneous to be suggested, the simplest mode is fully according to the interior photoflash lamp that is built on the fuselage, as long as photoflash lamp is luminous, just the spectrum with photoflash lamp is as the criterion, with be stored in preset value in the holder as the set point of white balance (with reference to U.S. Pat 5,001,552), needn't consider other light source fully, and photoflash lamp luminous color composition be again known, be easy to just can reach white balance exactly.
But only among the darkroom, otherwise the reverberation that still has from other light sources enters camera, and therefore, this kind method is obviously too simplified the composition of colour temperature, the result badly of its white balance.
And as shown in Figure 1, a kind of improved technology is to take an image earlier before photoflash lamp is not luminous, and the brightness of calculating this image, afterwards, photoflash lamp is luminous takes an image again, and the brightness of calculating this image, difference by the brightness of two images relatively etc., the ratio of flash of light and other light sources is so that set with the adjustment of carrying out white balancing apparatus, last as can be known, photoflash lamp is luminous and the default position of arrival is accurate, filmed image is also set captured image and is adjusted (with reference to U.S. Pat 5,568,194) according to new white balance again.Though this kind method can obtain preferable white balance effect, its process complexity, the secondary that need glisten altogether, shooting three times, and need convert the R/G/B of whole image to the Y signal, could make brightness ratio.In addition, the method need be based on following prerequisite: the time interval of taking action for (1) three time is extremely short, and so, the influence of light source just can be considered as constant beyond the photoflash lamp; (2) luminous quantity of secondary flash of light is identical before and after, so, comes to make comparisons just meaningful with flashless result with the result of glistening for the first time.Yet because flash of light institute consuming electric power is very big, the luminous quantity of flash of light secondary is identical before and after making, under the assistance of not having other devices, in the reasonable time of can spending to supply the main capacitance of flash unit, so will destroy first hypothesis; If will shorten the time interval, then can destroy second hypothesis, this is supplied event surely because of main capacitance differs.
Summary of the invention
The object of the present invention is to provide a kind of automatic flash light white balancing apparatus and method thereof of digital camera, it can utilize the illumination information of flash unit with obtain to come from the outside respectively light source and flash of light, with the related setting of accurate adjustment white balance.
For achieving the above object, the automatic flash light white balancing apparatus of a kind of digital camera provided by the invention mainly comprises:
One image sensor is in order to the image in the sensing external world; One image-processing circuit has an automatic exposure control circuit, and it can set a time for exposure according to the image brilliance of this image sensor institute sensing; An and flash modules, comprise a flash lamp tube, one optical detector and a comparator, this flash lamp tube is in order to provide the light source of getting phase time, this optical detector when this flash lamp tube is luminous detected light brightness and will be converted to one first voltage signal, this comparator is this first signal of telecommunication and a reference voltage signal relatively, with when this first voltage signal during greater than this reference voltage signal, stop the luminous of this flash lamp tube, wherein, this optical detector and before this flash lamp tube is luminous, the time for exposure detected light brightness that sets with this automatic exposure control circuit, and set up one second voltage signal, adjust white balance according to this according to the ratio of this reference voltage signal and second voltage signal and set.
Also comprise a ratio generator so that this second voltage signal is compared with this reference voltage signal, and produce the ratio of this reference voltage signal and second voltage signal.
A kind of automatic flash light white balance method of digital camera, it is characterized in that, this digital camera has an image image sensor and a flash modules in order to the sensing external world, this flash modules is flashing and in first voltage signal of the brightness detected of representative during greater than a reference voltage signal, stop luminously, this method mainly comprises following step:
(A) set a time for exposure according to the image brilliance of this image sensor institute sensing;
(B) comply with this time for exposure detected light brightness with this flash modules, and set up one second voltage signal; And
(C) carry out white balance according to the ratio of this reference voltage signal and second voltage signal and set adjustment.
4. the automatic flash light white balance method of digital camera as claimed in claim 3 is characterized in that, more comprises a step (D) with luminous and after taking pictures in flash modules, and the image of taking the photograph is set and adjusted according to the white balance of step (C).
For further understanding structure of the present invention, feature and purpose thereof, elaborate with accompanying drawing and preferred embodiment.
Description of drawings
Fig. 1 is the flow chart of the white balance method of known camera.
Fig. 2 is the calcspar of the automatic flash light white balancing apparatus of digital camera of the present invention.
Fig. 3 is the flow chart of the automatic flash light white balance method of digital camera of the present invention.
Embodiment
One preferred embodiment of the automatic flash light white balancing apparatus of relevant digital camera of the present invention, please be earlier with reference to shown in Figure 2, it mainly is to include an image sensor 21, one image-processing circuit 22, one flash modules 23 and a ratio generator 24, wherein, this image sensor 21 is for example CCD device, can be in order to the image in the sensing external world, 23 of this flash modules comprise a flash lamp tube 231, one optical detector 232 and a comparator 233, this flash lamp tube 231 is in order to provide the light source of getting phase time, this optical detector 232 when this flash lamp tube 231 is luminous detected light brightness and will be converted to the first voltage signal V, this comparator 233 is this first a voltage signal V and a reference voltage signal Vx relatively, with as this first voltage signal V during greater than this reference voltage signal V x, stop the luminous of this flash lamp tube 231, brightness when therefore, this reference voltage signal Vx can represent and take pictures so that photoflash lamp is luminous.
This image-processing circuit 22 is in order to provide the parameter setting of image capture, reaching the extraneous image that image sensor 21 is captured handles, it includes an automatic exposure control circuit 221 and an Automatic white balance circuit 222, in the middle of, this automatic exposure control circuit 221 can be set a time for exposure according to the image brilliance of 21 sensings of this image sensor, and this Automatic white balance circuit 222 is to set adjustment in order to captured image is carried out white balance.
For accurately adjusting the related setting of white balance, and please refer to the flow process of method of the present invention shown in Figure 3, at first, before photoflash lamp is luminous, digital camera can be inferred extraneous colour temperature structure, at this moment, its automatic exposure device 21 has also determined the time for exposure simultaneously, and just time for exposure detected light brightness (step S301) according to this of the optical detector 232 in the flash modules 23, the photoelectric current that it produced can be set up one second voltage signal Va (step S302), and this second voltage signal Va can represent the brightness when not using photoflash lamp to take pictures.
In step S303, be this second voltage signal Va to be compared with this reference voltage signal Vx with this ratio generator 24, in the hope of ratio value Vx/Va, in view of the above, Automatic white balance circuit 222 in this image-processing circuit 22 is ratio value adjustment white balance setting (step S304) according to this just, then, photoflash lamp is luminous and arrive default position accurate (step S305), and filmed image is also set captured image and adjusted (step S306) according to new white balance again
By above explanation as can be known, the present invention is the setting of being adjusted white balance by Vx/Va, and because Va represents the brightness when not using photoflash lamp to take pictures, brightness when Vx then represents and takes pictures so that photoflash lamp is luminous, after this ratio of decision, the colour temperature structure of photoflash lamp is again known with extraneous at that time colour temperature structure, so can infer the colour temperature structure of this hybrid light source (photoflash lamp and external light source), therefore can carry out white balance setting accurately.With respect to prior art, the present invention only need take one, and only need glisten once; And in the present invention, this voltage ratio is to be a given value, and must be the summation influence of flash of light and other light sources; But, prior art judge that according to this flash of light and the information such as image brilliance of the ratio of other light sources are to be a measuring value, need heavily cover actions such as shooting, computing, statistics, so need take three and the secondary that will glisten with respect to prior art as can be known, the present invention is extremely superior at aspects such as efficient and performances.
It should be noted that above-mentioned many embodiment give an example for convenience of explanation, the interest field that the present invention advocated should be as the criterion so that claim is described certainly, but not only limits to the foregoing description.
Claims (3)
1. the automatic flash light white balancing apparatus of a digital camera is characterized in that, mainly comprises:
One image sensor is in order to the image in the sensing external world;
One image-processing circuit has an automatic exposure control circuit, and it can set a time for exposure according to the image brilliance of this image sensor institute sensing;
One flash modules, comprise a flash lamp tube, an optical detector and a comparator, this flash lamp tube is in order to provide the light source of getting phase time, the detected light brightness and be converted into one first voltage signal when this flash lamp tube is luminous of this optical detector, this comparator is this first signal of telecommunication and a reference voltage signal relatively, with when this first voltage signal during, stop the luminous of this flash lamp tube greater than this reference voltage signal;
Wherein, this optical detector and before this flash lamp tube is luminous, the time for exposure detected light brightness that sets with this automatic exposure control circuit, and set up one second voltage signal; And
One ratio generator to be comparing this second voltage signal with this reference voltage signal, and produces the ratio of this reference voltage signal and second voltage signal, adjusts white balance according to this according to the ratio of this reference voltage signal and second voltage signal and sets.
2. the automatic flash light white balance method of a digital camera, this digital camera has an image image sensor and a flash modules in order to the sensing external world, this flash modules comprises a flash lamp tube, an optical detector and a comparator, with by optical detector detected light brightness and be converted into one first voltage signal when flash lamp tube is luminous, utilize comparator relatively this first signal of telecommunication and reference voltage signal again, with when first voltage signal during greater than this reference voltage signal, stop the luminous of flash lamp tube, this method mainly comprises following step:
(A) set a time for exposure according to the image brilliance of this image sensor institute sensing;
(B) comply with this time for exposure detected light brightness with this flash modules, and set up one second voltage signal; And
(C) carry out white balance according to the ratio of this reference voltage signal and second voltage signal and set adjustment.
3. the automatic flash light white balance method of digital camera as claimed in claim 2 is characterized in that, also comprises a step (D) with luminous and after taking pictures in flash modules, and the image of taking the photograph is set and adjusted according to the white balance of step (C).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134501 CN1239028C (en) | 2001-10-31 | 2001-10-31 | White balancing device and method for automatic flash lamp of digital camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134501 CN1239028C (en) | 2001-10-31 | 2001-10-31 | White balancing device and method for automatic flash lamp of digital camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1418019A CN1418019A (en) | 2003-05-14 |
| CN1239028C true CN1239028C (en) | 2006-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01134501 Expired - Fee Related CN1239028C (en) | 2001-10-31 | 2001-10-31 | White balancing device and method for automatic flash lamp of digital camera |
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| CN (1) | CN1239028C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4994825B2 (en) * | 2006-12-22 | 2012-08-08 | キヤノン株式会社 | IMAGING DEVICE, ITS CONTROL METHOD, PROGRAM, AND STORAGE MEDIUM |
| 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 |
| CN101472076B (en) * | 2007-12-28 | 2010-09-29 | 鸿富锦精密工业（深圳）有限公司 | Device for filming image and filming control method thereof |
| CN101600121B (en) * | 2008-06-03 | 2011-03-23 | 亚洲光学股份有限公司 | Computing method of white balance correct value |
| CN104834152B (en) * | 2014-02-08 | 2019-02-26 | 深圳富泰宏精密工业有限公司 | The System and method for that control camera flash-light is taken pictures |
| JP2015203764A (en) * | 2014-04-14 | 2015-11-16 | キヤノン株式会社 | Light-emitting device, method for controlling the same, control program, and imaging apparatus |
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2001
- 2001-10-31 CN CN 01134501 patent/CN1239028C/en not_active Expired - Fee Related
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| CN1418019A (en) | 2003-05-14 |
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