CN101771826A - Digital shooting device and luminance correcting method thereof - Google Patents
Digital shooting device and luminance correcting method thereof Download PDFInfo
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- CN101771826A CN101771826A CN200810189116A CN200810189116A CN101771826A CN 101771826 A CN101771826 A CN 101771826A CN 200810189116 A CN200810189116 A CN 200810189116A CN 200810189116 A CN200810189116 A CN 200810189116A CN 101771826 A CN101771826 A CN 101771826A
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Abstract
The invention discloses a digital shooting device and a luminance correcting method thereof. When shooting a digital image, the digital shooting device utilizes flash lamp compensation to perform luminance correction on a shot object in the image. The luminance correcting method comprises the following steps: setting an amplification factor of the digital shooting device for the shot object; acquiring a pre-shot image at least comprising the image of the shot object; shooting the digital image and triggering a flash lamp to emit main flashlight to irradiate the shot object; setting a plurality of photometric areas of the digital image; obtaining corresponding object distances of the shot object in the photometric areas; establishing a shading compensation table according to the object distances; and loading the shading compensation table and adjusting the luminance of the digital image in each photometric area.
Description
Technical field
The present invention relates to a kind of digital camera device and brightness correcting method thereof, particularly a kind of brightness correcting method and digital camera device thereof of the subject to different distance.
Background technology
Along with the development of digital camera, make that photography no longer is expensive consumption.The user can be random the desired image of shooting, in order to write down memorable a moment or scene.Lens group in the digital camera device causes subject and light source the problem of Luminance Distribution inequality can occur in imaging process because of physical characteristic.In other words can be at the center of digitized video than bright all around.In this simultaneously, can be more obvious if then Luminance Distribution is uneven when utilizing photoflash lamp to carry out reinforcement again.Its occurrence cause is that photoflash lamp is by reflecting plate all light sources to be got on the subject, and the position of photoflash lamp and lens group is different, causes captured subject along with camera has different influences with the distance of object being shot.If when digital camera device was healed near subject, the Luminance Distribution of digitized video can be the more, vice versa.For solving the problem of above-mentioned Luminance Distribution, therefore a kind of compensation meter (shading table) that covers is proposed, represent digitized video and utilize the mode of digital gain (digital gain) digitized video to be carried out the compensation of brightness with a two-dimensional matrix.
Please refer to shown in Figure 1ly, it is the schematic flow sheet of prior art.Capture a digital image (step S110) in advance.Whether decision opens photoflash lamp (step S120).If when opening photoflash lamp, then estimate the fluorescent lifetime (step S130) of photoflash lamp.If when not opening photoflash lamp, then directly take digitized video and load and cover compensation meter in order to adjust digitized video (step S140).If only with a kind of when covering compensation meter and being applied to all shooting environmental, the gain that can produce the distant view in the digitized video when different focusing object distance is too many and the close shot gain is not enough, and vice versa.So, at the nature inadequately that can seem on the contrary through revised digitized video.
Summary of the invention
In view of above problem, main purpose of the present invention is to provide a kind of brightness correcting method of digital camera device, when utilizing the taking photos by using flashlights digitized video subject in the image is carried out gamma correction.
For reaching above-mentioned purpose, the brightness correcting method of a kind of digital camera device that the present invention discloses may further comprise the steps: capture pre-photogra, wherein include the image of subject at least; Take digitized video, the trigger flashing lamp sends main flash irradiation object being shot; Set a plurality of photometry regions of digitized video; Obtain a corresponding object distance of subject in the photometry region; According to above-mentioned object distance, set up and cover compensation meter; Compensation meter is covered in loading, adjusts the brightness of each photometry region of digitized video.
From another viewpoint of the present invention, the present invention proposes a kind of brightness correcting method of digital camera device, when utilizing the taking photos by using flashlights digitized video subject in the image is carried out gamma correction.
For achieving the above object, the brightness correcting method of a kind of digital camera device that the present invention discloses may further comprise the steps: acquisition of digital video comprises the picture of at least one subject at digitized video; In digitized video, set a plurality of photometry regions, and obtain the homologue distance of subject in the photometry region; According to the homologue distance of subject, be written into and cover compensation meter accordingly; The brightness value that compensation meter is adjusted each photometry region of digitized video is covered in utilization.
From another viewpoint of the present invention, the present invention proposes to have the digital camera device of gamma correction, when it utilizes the taking photos by using flashlights digitized video subject in the image is carried out gamma correction.
For achieving the above object, propose to have in the digital camera device of gamma correction and include: lens group, photoflash lamp, photosensory assembly, storage element and processing unit.Lens group is in order to adjust the focal length to subject; Photosensory assembly is electrically connected at lens group, and photosensory assembly receives the signal of video signal of subject by lens group; Storage element is electrically connected at photosensory assembly, and storage element is in order to store the digitized video that photosensory assembly received and to cover compensation meter; Processing unit is electrically connected at photoflash lamp, photosensory assembly and storage element, and processing unit is covered compensation meter in order to adjust the value of exerting oneself of photoflash lamp according to what shooting in advance set up.
The invention provides a kind of brightness correcting method and digital camera device thereof to digitized video, it is according to photometry regions different in the digitized video.Digital camera device is according to the distance of these photometry regions to subject, covers in the compensation meter in order to respectively each photometry region is set an exclusive intensity correction values and write down these intensity correction values to one.And for the subject of different distance/shooting multiplying power, what load respective distance covers compensation meter avoiding because of the digitized video of single gain value to whole compensates, and then causes subregion overexposure in the digitized video.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the schematic diagram of existing luminance regulating method;
Fig. 2 is a configuration diagram of the present invention;
Fig. 3 A is an operation workflow schematic diagram of the present invention;
Fig. 3 B is the schematic diagram of the enforcement aspect of different object distances;
Fig. 3 C is the schematic diagram of the enforcement aspect of different object distances;
Fig. 3 D is written into the operation workflow figure that covers compensation meter;
Fig. 4 is the schematic diagram with digitized video of photometry region;
Fig. 5 is intensity correction values and subject distance Curve schematic diagram.
Wherein, Reference numeral
200 digital camera devices
210 lens group
220 photoflash lamps
230 photosensory assemblies
240 storage elements
241 cover compensation meter
250 processing units
510 solid box
520 frame of broken lines
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are done concrete description:
Please refer to shown in Figure 2ly, it is a configuration diagram of the present invention.Include in the digital camera device 200 of the present invention: lens group 210, photoflash lamp 220, photosensory assembly 230, storage element 240 and processing unit 250.Lens group 210 is in order to adjust focal length and the convergent-divergent multiplying power to subject.Photosensory assembly 230 is electrically connected at lens group 210, and photosensory assembly 230 receives the signal of video signal of subject by lens group 210.Storage element 240 is electrically connected at photosensory assembly 230, storage element 240 in order to the digitized video that stores photosensory assembly 230 and received with cover compensation meter 241.Processing unit 250 is electrically connected at photoflash lamp 220, photosensory assembly 230 and storage element 240, and processing unit 250 is covered compensation meter 241 in order to adjust the value of exerting oneself of photoflash lamp 220 according to what shooting in advance set up.
For clearly demonstrating operation of the present invention, please cooperate with reference to shown in the figure 3A, it is an operation workflow schematic diagram of the present invention.Running of the present invention may further comprise the steps:
Capture pre-photogra (step S310), in pre-photogra, include the image of a subject at least.
The trigger flashing lamp sends main flash irradiation subject, in order to take digitized video (step S320).
In digitized video, set a plurality of photometry regions (step S330).
Obtain a corresponding object distance (step S340) of subject in each photometry region.According in the digitized video during taking photos by using flashlights subject, the luminance difference value between the reflective degree of subject and pre-photogra.According to both luminance difference values, determine the object distance of subject in each photometry region again.
Set up one according to each above-mentioned object distance and cover compensation meter (step S350).
At last, adjust the brightness value (step S360) of each photometry region of digitized video according to covering compensation meter.
For clearly demonstrating the foundation of covering compensation meter, in this explanation of setting up in the following manner, but be not only to limit to this enforcement aspect, only chat bright earlier at this.Please cooperate shown in Fig. 3 B and Fig. 3 C, it is the schematic diagram of the enforcement aspect of different object distances.In Fig. 3 B and Fig. 3 C with a metope as object.In Fig. 3 B, the object distance of digital camera device and metope is d1; In Fig. 3 C, the object distance of digital camera device and metope is d2.Each with different object distances (such as 30 centimeters at every interval), and take several digitized video.Again according to setting up with the degree of successively decreasing all around in the middle of the digitized video of different object distances.Except the above-mentioned metope on plane that utilizes covers setting up the mode of compensation meter, can also take the image that portrait or article etc. have different object distances, cover compensation meter with foundation.
When digital camera device when taking, digital camera device can cover compensation meter according to the in good time loading of the object distance of current object, to carry out the luminance compensation to object.Please refer to shown in Fig. 3 D, it is to be written into the operation workflow figure that covers compensation meter.Please refer to following step:
Step S410: acquisition of digital video comprises the picture of at least one subject at digitized video;
Step S420: in digitized video, set a plurality of photometry regions, and obtain the homologue distance of subject in the photometry region;
Step S430:, be written into and cover compensation meter accordingly according to the homologue distance of subject; And
Step S440: utilize and cover the brightness value that compensation meter is adjusted each photometry region of digitized video.
Please be at this in addition with reference to shown in Figure 4, it is the schematic diagram with digitized video of photometry region.Wherein, it not is only to be confined to aspect shown in Figure 4 that the quantity of photometry region and scope are set, this close chat earlier bright.To the compensating proportion of each photometry region (meaning is a frame of broken lines 520 among Fig. 4) in the digitized video (meaning is the solid box 510 among Fig. 4) according to distance and the luminance difference decision of the photometry region of central authorities to the photometry region arround it.For instance, intensity correction values need be heightened for remote more subject, vice versa.Please be in addition with reference to shown in Figure 5, intensity correction values and subject distance Curve schematic diagram.For subject distance, luminance difference and compensating proportion three is positive correlation, in other words subject more at a distance and luminance difference bigger, also bigger to the compensating proportion of subject.
For clearly demonstrating function mode of the present invention, describe with following enforcement aspect.At first, the action that 200 pairs first subjects of digital camera device are focused, and capture a pre-photogra.Then, digital camera device 200 percussion photoflash lamps 220 are also taken a digital image, and wherein photoflash lamp being exerted oneself is set at the main intensity of dodging.Digital camera device 200 is taken the photograph object object distance to digital camera device 200 in order to estimation by first according to the intensity of 220 pairs of subject reflections of photoflash lamp.Digital camera device 200 is divided into a plurality of photometry regions again according to the digitized video that is captured with it.Describe with center photometry region and contiguous photometry region in the present invention, other is implemented aspect and all can use those skilled in the art, therefore no longer adds to give unnecessary details.
200 pairs of center photometry regions of digital camera device carry out the range estimation of first subject, in order to the center photometry region is produced a corresponding photometry offset.Then, digital camera device 200 is estimated its distance respectively for other contiguous photometry region, and writes down its corresponding photometry offset respectively.Wherein, the center photometry region can utilize interpolation calculation to estimate according to the distance of subject with the photometry offset of contiguous photometry region, please refer to shown in Figure 5.In addition, the present invention also can be independent to each photometry region take after, respectively each photometry region is set corresponding intensity correction values.After finishing the intensity correction values of each photometry region, these intensity correction values are recorded in one cover in the compensation meter 241.In other words, digital camera device 200 can calculate and cover compensation meter 241 accordingly when different object distances.
Then, the action that digital camera device 200 is taken second subject again, in other words.And repeat above-mentioned intensity correction values setting action and cover compensation meter 241 with foundation.Digital camera device utilizes different subjects to set up it respectively to cover compensation meter 241 accordingly, loads with the subject to different distance/shooting multiplying power and covers compensation meter 241 accordingly.
The invention provides a kind of brightness correcting method to digitized video, it is according to photometry regions different in the digitized video.Digital camera device 200 is according to the distance of these photometry regions to subject, covers in the compensation meter 241 in order to respectively each photometry region is set an exclusive intensity correction values and write down these intensity correction values to one.And for the subject of different distance/shooting multiplying power, what load respective distance covers compensation meter 241 avoiding because of the digitized video of single gain value to whole compensates, and then causes subregion overexposure in the digitized video.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (5)
1. the brightness correcting method of a digital camera device carries out gamma correction at least one digitized video when taking, and it is characterized in that this brightness correcting method may further comprise the steps:
Acquisition one pre-photogra, this pre-photogra comprises the picture of at least one subject;
Trigger a photoflash lamp and send this subject of main flash irradiation, to take a digitized video;
In this digitized video, set a plurality of photometry regions;
Obtain a corresponding object distance of this subject in those photometry regions;
According to those object distances, set up one and cover compensation meter; And
Cover the brightness value of compensation meter according to this in order to each this photometry region of adjusting this digitized video.
2. the brightness correcting method of digital camera device according to claim 1 is characterized in that, according to those object distances, sets up after this step of covering compensation meter further comprising the steps of:
Again determine the object distance of another this subject; And
Set up corresponding this of another this subject and cover compensation meter.
3. the brightness correcting method of digital camera device according to claim 1 is characterized in that, and is further comprising the steps of in obtaining this object distance:
Compare a luminance difference value of this photometry region of the same position in this pre-photogra and this digitized video; And
According to this luminance difference value, determine this object distance of this subject in each this photometry region.
4. the brightness correcting method of a digital camera device carries out gamma correction at least one digitized video when taking, and it is characterized in that this brightness correcting method may further comprise the steps:
Capture a digitized video, this digitized video comprises the picture of at least one subject;
In this digitized video, set a plurality of photometry regions, and obtain a corresponding object distance of this subject in those photometry regions;
Should object distance according to the phase of this subject in those photometry regions, load corresponding one and cover compensation meter; And
Utilize this to cover the brightness value that compensation meter is adjusted each this photometry region of this digitized video.
5. digital camera device with gamma correction, it utilizes photoflash lamp compensation when taking digitized video the subject in the image to be carried out gamma correction, it is characterized in that this digital camera device includes:
One lens group is in order to adjust focal length and the convergent-divergent multiplying power to subject;
One photosensory assembly is electrically connected at this lens group, and this photosensory assembly receives the signal of video signal of subject by this lens group;
One storage element is electrically connected at this photosensory assembly, and this storage element covers compensation meter in order to the digitized video and that stores this photosensory assembly and receive; And
One processing unit is electrically connected at this photoflash lamp, this photosensory assembly and this storage element, and this processing unit covers compensation meter in order to adjust the value of exerting oneself of this photoflash lamp according to taking this that set up in advance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101891169A CN101771826B (en) | 2008-12-29 | 2008-12-29 | Digital shooting device and luminance correcting method thereof |
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| CN2008101891169A CN101771826B (en) | 2008-12-29 | 2008-12-29 | Digital shooting device and luminance correcting method thereof |
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| CN101771826B CN101771826B (en) | 2011-09-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282401A (en) * | 2014-06-13 | 2016-01-27 | 聚晶半导体股份有限公司 | Image acquisition device and shading compensation method thereof |
| CN106067953A (en) * | 2015-04-22 | 2016-11-02 | 摩托罗拉移动有限责任公司 | Determine the method and apparatus being used for that there is the camera lens shadow correction of the polyphaser equipment of various visual field |
| CN107241535A (en) * | 2017-05-26 | 2017-10-10 | 北京小米移动软件有限公司 | Flash lamp adjusting means and terminal device |
| CN107948539A (en) * | 2015-04-30 | 2018-04-20 | 广东欧珀移动通信有限公司 | A kind of flash lamp control method and terminal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1263280C (en) * | 2002-11-05 | 2006-07-05 | 奥林巴斯株式会社 | Camera |
| JP3835433B2 (en) * | 2003-05-23 | 2006-10-18 | セイコーエプソン株式会社 | Image processing using image generation history information |
| CN101000445A (en) * | 2006-01-10 | 2007-07-18 | 明基电通股份有限公司 | Method for compensating exposure of flash lamp when camera photographic |
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2008
- 2008-12-29 CN CN2008101891169A patent/CN101771826B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282401A (en) * | 2014-06-13 | 2016-01-27 | 聚晶半导体股份有限公司 | Image acquisition device and shading compensation method thereof |
| CN106067953A (en) * | 2015-04-22 | 2016-11-02 | 摩托罗拉移动有限责任公司 | Determine the method and apparatus being used for that there is the camera lens shadow correction of the polyphaser equipment of various visual field |
| CN106067953B (en) * | 2015-04-22 | 2020-01-10 | 摩托罗拉移动有限责任公司 | Method and apparatus for determining lens shading correction for multi-camera device with various fields of view |
| CN107948539A (en) * | 2015-04-30 | 2018-04-20 | 广东欧珀移动通信有限公司 | A kind of flash lamp control method and terminal |
| CN107948539B (en) * | 2015-04-30 | 2020-07-17 | Oppo广东移动通信有限公司 | Flash lamp control method and terminal |
| CN107241535A (en) * | 2017-05-26 | 2017-10-10 | 北京小米移动软件有限公司 | Flash lamp adjusting means and terminal device |
| CN107241535B (en) * | 2017-05-26 | 2020-10-23 | 北京小米移动软件有限公司 | Flash lamp adjusting device and terminal equipment |
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| CN101771826B (en) | 2011-09-14 |
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