CN104506777A - Method and device for controlling exposure of flash lamp - Google Patents
Method and device for controlling exposure of flash lamp Download PDFInfo
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- CN104506777A CN104506777A CN201410778992.0A CN201410778992A CN104506777A CN 104506777 A CN104506777 A CN 104506777A CN 201410778992 A CN201410778992 A CN 201410778992A CN 104506777 A CN104506777 A CN 104506777A
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- motor position
- camera
- critical point
- overexposure
- sun
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Abstract
The invention discloses a method and a device for controlling exposure of a flash lamp. The method comprises the following steps: driving a motor of a camera to focus when the camera is started for shooting, and acquiring the focused current motor position; judging whether the current motor position is positioned inside an under-exposed critical point motor position or positioned outside an over-exposed critical point motor position; adjusting the sensitivity of the camera according to a judgment result in order to control the exposure of the flash lamp. The invention further discloses a corresponding device. According to the method and the device, the sensitivity of the camera is adjusted according to the judgment result by judging whether the current motor position focused by the camera is positioned within the under-exposed critical point motor position or positioned outside the over-exposed critical point motor position in order to control the exposure of the flash lamp, so that the exposure of the flash lamp can be controlled automatically, and the phenomena of near overexposure and far overexposure are avoided.
Description
Technical field
The present invention relates to technical field of image processing, particularly relate to a kind of method and the device that control exposure of flash lamp.
Background technology
Along with the raising of people's living standard, people like the terminal taking photo with professional camera or band camera function, but, the exposure of amateur cameraman to the photoflash lamp controlling camera is difficult to hold, when opening the photoflash lamp on camera and taking pictures, there is overexposure nearby, owe the phenomenon of exposing to the sun at a distance.
Therefore, need the scheme that a kind of automatic control exposure of flash lamp is provided, prevent overexposure nearby, owe the generation of the phenomenon of exposing to the sun at a distance.
Summary of the invention
The invention provides a kind of method and the device that control exposure of flash lamp, automatically to control exposure of flash lamp, prevent overexposure nearby, owe the generation of the phenomenon of exposing to the sun at a distance.
On the one hand, provide a kind of method controlling exposure of flash lamp, comprising:
When starting camera and taking pictures, drive the motor of described camera to focus, obtain defocused present motor position;
Judge whether described present motor position is positioned within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure;
According to the result of described judgement, adjust the photosensitivity of described camera, to control the exposure of described photoflash lamp.
On the other hand, provide a kind of device controlling exposure of flash lamp, comprising:
First acquiring unit, for when starting camera and taking pictures, drives the motor of described camera to focus, obtains defocused present motor position;
Judging unit, for judging whether described present motor position is positioned within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure;
Adjustment unit, for the result according to described judgement, adjusts the photosensitivity of described camera, to control the exposure of described photoflash lamp.
Visible, according to a kind of method and apparatus controlling exposure of flash lamp provided by the invention, by judging whether camera is positioned at defocused present motor position within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure, according to the result judged, the photosensitivity of adjustment camera, to control the exposure of photoflash lamp, automatically can control exposure of flash lamp, prevent overexposure nearby, owe the generation of the phenomenon of exposing to the sun at a distance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of schematic flow sheet controlling the method for exposure of flash lamp that Fig. 1 provides for the embodiment of the present invention;
A kind of schematic flow sheet that control the further refinement of the method for exposure of flash lamp of Fig. 2 for providing the embodiment of the present invention shown in Fig. 1;
A kind of structural representation controlling the device of exposure of flash lamp that Fig. 3 provides for the embodiment of the present invention;
A kind of structural representation that control the further refinement of the device of exposure of flash lamp of Fig. 4 for providing the embodiment of the present invention shown in Fig. 3.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, be a kind of schematic flow sheet controlling the method for exposure of flash lamp that the embodiment of the present invention provides, the method comprises the following steps:
Step S101, when starting camera and taking pictures, drives the motor of described camera to focus, obtains defocused present motor position.
Camera involved by the embodiment of the present invention can be the camera such as digital camera of specialty, also can be the terminal with camera function, such as mobile phone, panel computer etc.When starting camera and taking pictures, can perform and once focus, the process of focusing is exactly drive the motor shift position of camera to focus, and to defocused, obtains present motor position.
Step S102, judges whether described present motor position is positioned within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure.
When focusing, motor likely moves to the nearer position of focal point, also focal point position far away is likely moved to, then, the photosensitivity (ISO) of camera is determined according to multiple parameters such as surrounding environment, if present motor position focal point is excessively near, the phenomenon of photoflash lamp overexposure can be there is; If present motor position focal point is excessively far away, the phenomenon that photoflash lamp is owed to expose to the sun can be there is.Therefore, first can judge whether be positioned within the critical point motor position owing to expose to the sun to defocused present motor position or be positioned at outside the critical point motor position of overexposure.
Step S103, according to the result of described judgement, adjusts the photosensitivity of described camera, to control the exposure of described photoflash lamp.
According to the result judged, namely outside the critical point motor position defocused present motor position being positioned within the critical point motor position owing to expose to the sun or be positioned at overexposure, the photosensitivity of adjustment camera, specifically reduce or increase the photosensitivity of camera, to prevent overexposure or long-range generation of owing the phenomenon of exposing to the sun nearby; Certainly, if to defocused present motor position between the critical point motor position owing to expose to the sun and the critical point motor position of overexposure, then without the need to readjusting the photosensitivity of camera.
According to a kind of method controlling exposure of flash lamp provided by the invention, by judging whether camera is positioned at defocused present motor position within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure, according to the result judged, the photosensitivity of adjustment camera, to control the exposure of photoflash lamp, automatically can control exposure of flash lamp, prevent overexposure nearby, owe the generation of the phenomenon of exposing to the sun at a distance.
Refer to Fig. 2, be a kind of schematic flow sheet controlling the further refinement of the method for exposure of flash lamp provided the embodiment of the present invention shown in Fig. 1, the method comprises the following steps:
Step S201, before camera takes pictures in startup, to expose to the sun to described camera deficient and overexposure is tested, obtains the critical point motor position owing critical point motor position and the overexposure exposed to the sun.
First test current camera overexposure, owe the location point that exposes to the sun, assuming that overexposure within 50cm, at this moment record the position position_50cm of motor at 50cm.Assuming that owe beyond 150cm to expose to the sun, at this moment record the position position_150cm of motor at 150cm.
Step S202, when starting described camera and taking pictures, drives the motor of described camera to focus, obtains defocused present motor position.
Open camera flashlamp to take pictures, record present motor position position_current.
Step S203, judges whether described present motor position is positioned within the described critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of described overexposure; If described present motor position is positioned within the described critical point motor position owing to expose to the sun, then go to step S204; If described present motor position is positioned at outside the critical point motor position of described overexposure, then go to step S205.
Step S204, if described present motor position is positioned within the described critical point motor position owing to expose to the sun, reduces the photosensitivity of described camera, to prevent described photoflash lamp overexposure.
If position_current<position_50cm, then the ISO that photoflash lamp is taken pictures is multiplied by this ratio: position_current/position_50cm, to reduce brightness.That is:
ISO
2＝ISO
1*position_current/position_50cm
Wherein, ISO
1for the photosensitivity that camera before adjustment exposure of flash lamp is determined according to multiple parameters such as surrounding environment, ISO
2for the photosensitivity of the camera after adjustment exposure of flash lamp.
Step S205, if described present motor position is positioned at outside the critical point motor position of described overexposure, increases the photosensitivity of described camera, owes to expose to the sun to prevent described photoflash lamp.
If position_current>position_150cm, ISO is multiplied by position_150cm/position_current, to improve brightness.That is:
ISO
3＝ISO
1*position_150cm/position_current
Wherein, ISO
3for the photosensitivity of the camera after adjustment exposure of flash lamp.
ISO after adjustment is write into the register of camera, control the brightness of exposure.So just the brightness within 50cm can be reduced, the brightness beyond 150cm improves, and reaches nearby not overexposure, does not owe the object of exposing to the sun at a distance.
According to a kind of method controlling exposure of flash lamp provided by the invention, by judging whether camera is positioned at defocused present motor position within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure, according to the result judged, the photosensitivity of adjustment camera, to control the exposure of photoflash lamp, automatically can control exposure of flash lamp, prevent overexposure nearby, owe the generation of the phenomenon of exposing to the sun at a distance.
Refer to Fig. 3, be a kind of structural representation controlling the device of exposure of flash lamp that the embodiment of the present invention provides, this device 1000 comprises:
First acquiring unit 11, for when starting camera and taking pictures, drives the motor of described camera to focus, obtains defocused present motor position.
Camera involved by the embodiment of the present invention can be the camera such as digital camera of specialty, also can be the terminal with camera function, such as mobile phone, panel computer etc.When starting camera and taking pictures, can perform and once focus, the process of focusing is exactly drive the motor shift position of camera to focus, and the first acquiring unit 11, to defocused, obtains present motor position.
Judging unit 12, for judging whether described present motor position is positioned within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure.
When focusing, motor likely moves to the nearer position of focal point, also focal point position far away is likely moved to, then, the photosensitivity (ISO) of camera is determined according to multiple parameters such as surrounding environment, if present motor position focal point is excessively near, the phenomenon of photoflash lamp overexposure can be there is; If present motor position focal point is excessively far away, the phenomenon that photoflash lamp is owed to expose to the sun can be there is.Therefore, first judging unit 12 can judge whether be positioned within the critical point motor position owing to expose to the sun to defocused present motor position or be positioned at outside the critical point motor position of overexposure.
Adjustment unit 13, for the result according to described judgement, adjusts the photosensitivity of described camera, to control the exposure of described photoflash lamp.
Adjustment unit 13 is according to the result judged, namely outside the critical point motor position defocused present motor position being positioned within the critical point motor position owing to expose to the sun or be positioned at overexposure, the photosensitivity of adjustment camera, specifically reduce or increase the photosensitivity of camera, to prevent overexposure or long-range generation of owing the phenomenon of exposing to the sun nearby; Certainly, if to defocused present motor position between the critical point motor position owing to expose to the sun and the critical point motor position of overexposure, then without the need to readjusting the photosensitivity of camera.
According to a kind of device controlling exposure of flash lamp provided by the invention, by judging whether camera is positioned at defocused present motor position within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure, according to the result judged, the photosensitivity of adjustment camera, to control the exposure of photoflash lamp, automatically can control exposure of flash lamp, prevent overexposure nearby, owe the generation of the phenomenon of exposing to the sun at a distance.
Refer to Fig. 4, be a kind of structural representation controlling the further refinement of the device of exposure of flash lamp provided the embodiment of the present invention shown in Fig. 3, this device 2000 comprises:
Second acquisition unit 21, before camera takes pictures in startup, to expose to the sun to described camera deficient and overexposure is tested, obtains the critical point motor position owing critical point motor position and the overexposure exposed to the sun.
First test current camera overexposure, owe the location point that exposes to the sun, assuming that overexposure within 50cm, at this moment record the position position_50cm of motor at 50cm.Assuming that owe beyond 150cm to expose to the sun, at this moment record the position position_150cm of motor at 150cm.
First acquiring unit 22, for when starting described camera and taking pictures, drives the motor of described camera to focus, obtains defocused present motor position.
Open camera flashlamp to take pictures, record present motor position position_current.
Judging unit 23, for judging whether described present motor position is positioned within the described critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of described overexposure.
Adjustment unit 24, for the result according to described judgement, adjusts the photosensitivity of described camera, to control the exposure of described photoflash lamp.
In the present embodiment, adjustment unit 24 comprises reduction unit 241 and increases unit 242.
Reduce unit 241, if be positioned within the described critical point motor position owing to expose to the sun for described present motor position, reduce the photosensitivity of described camera, to prevent described photoflash lamp overexposure.
If position_current<position_50cm, then the ISO that photoflash lamp is taken pictures is multiplied by this ratio: position_current/position_50cm, to reduce brightness.That is:
ISO
2＝ISO
1*position_current/position_50cm
Wherein, ISO
1for the photosensitivity that camera before adjustment exposure of flash lamp is determined according to multiple parameters such as surrounding environment, ISO
2for the photosensitivity of the camera after adjustment exposure of flash lamp.
Increase unit 242, if outside the critical point motor position being positioned at described overexposure for described present motor position, increase the photosensitivity of described camera, owe to expose to the sun to prevent described photoflash lamp.
If position_current>position_150cm, ISO is multiplied by position_150cm/position_current, to improve brightness.That is:
ISO
3＝ISO
1*position_150cm/position_current
Wherein, ISO
3for the photosensitivity of the camera after adjustment exposure of flash lamp.
ISO after adjustment is write into the register of camera, control the brightness of exposure.So just the brightness within 50cm can be reduced, the brightness beyond 150cm improves, and reaches nearby not overexposure, does not owe the object of exposing to the sun at a distance.
According to a kind of device controlling exposure of flash lamp provided by the invention, by judging whether camera is positioned at defocused present motor position within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure, according to the result judged, the photosensitivity of adjustment camera, to control the exposure of photoflash lamp, automatically can control exposure of flash lamp, prevent overexposure nearby, owe the generation of the phenomenon of exposing to the sun at a distance.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can use hardware implementing, or firmware realizes, or their compound mode realizes.When implemented in software, above-mentioned functions can be stored in computer-readable medium or as the one or more instruction on computer-readable medium or code and transmit.Computer-readable medium comprises computer-readable storage medium and communication media, and wherein communication media comprises any medium being convenient to transmit computer program from a place to another place.Storage medium can be any usable medium that computer can access.As example but be not limited to: computer-readable medium can comprise random access memory (Random Access Memory, RAM), read-only memory (Read-Only Memory, ROM), EEPROM (Electrically Erasable Programmable Read Only Memo) (Electrically ErasableProgrammable Read-Only Memory, EEPROM), read-only optical disc (Compact Disc Read-OnlyMemory, or other optical disc storage CD-ROM), magnetic disk storage medium or other magnetic storage apparatus, or the program code that can be used in carrying or storing the expectation with instruction or data structure form also can by any other medium of computer access.In addition.Any connection can be suitable become computer-readable medium.Such as, if software uses coaxial cable, optical fiber cable, twisted-pair feeder, Digital Subscriber Line (Digital SubscriberLine, DSL) or the wireless technology of such as infrared ray, radio and microwave and so on from website, server or other remote source, so the wireless technology of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, wireless and microwave and so on be included in affiliated medium fixing in.As used in the present invention, dish (Disk) and dish (disc) comprise compression laser disc (CD), laser dish, laser disc, Digital Versatile Disc (DVD), floppy disk and Blu-ray Disc, the copy data of the usual magnetic of its mid-game, dish then carrys out the copy data of optics with laser.Combination above also should be included within the protection range of computer-readable medium.
In a word, the foregoing is only the preferred embodiment of technical solution of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. control a method for exposure of flash lamp, it is characterized in that, comprising:
When starting camera and taking pictures, drive the motor of described camera to focus, obtain defocused present motor position;
Judge whether described present motor position is positioned within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure;
According to the result of described judgement, adjust the photosensitivity of described camera, to control the exposure of described photoflash lamp.
2. the method for claim 1, is characterized in that, also comprises:
Before in startup, described camera takes pictures, described camera deficient to be exposed to the sun and overexposure is tested, obtain described owe to expose to the sun critical point motor position and the critical point motor position of described overexposure.
3. method as claimed in claim 1 or 2, it is characterized in that, the described result according to described judgement, adjusts the photosensitivity of described camera, to control the exposure of described photoflash lamp, comprising:
If described present motor position is positioned within the described critical point motor position owing to expose to the sun, reduce the photosensitivity of described camera, to prevent described photoflash lamp overexposure;
If described present motor position is positioned at outside the critical point motor position of described overexposure, increase the photosensitivity of described camera, owe to expose to the sun to prevent described photoflash lamp.
4. method as claimed in claim 3, is characterized in that, if described present motor position is positioned within the described critical point motor position owing to expose to the sun, reduce the photosensitivity of described camera, to prevent described photoflash lamp overexposure, comprising:
If described present motor position is positioned within the described critical point motor position owing to expose to the sun, the photosensitivity of described camera obtained after adjustment is the ratio that the photosensitivity of described camera is multiplied by described present motor position and the described critical point motor position owing to expose to the sun.
5. method as claimed in claim 3, is characterized in that, if described present motor position is positioned at outside the critical point motor position of described overexposure, increase the photosensitivity of described camera, to prevent described photoflash lamp to owe to expose to the sun, comprising:
If described present motor position is positioned at outside the critical point motor position of described overexposure, the photosensitivity of described camera obtained after adjustment is that the photosensitivity of described camera is multiplied by the critical point motor position of described overexposure and the ratio of described present motor position.
6. control a device for exposure of flash lamp, it is characterized in that, comprising:
First acquiring unit, for when starting camera and taking pictures, drives the motor of described camera to focus, obtains defocused present motor position;
Judging unit, for judging whether described present motor position is positioned within the critical point motor position owing to expose to the sun or is positioned at outside the critical point motor position of overexposure;
Adjustment unit, for the result according to described judgement, adjusts the photosensitivity of described camera, to control the exposure of described photoflash lamp.
7. device as claimed in claim 6, is characterized in that, also comprise:
Second acquisition unit, before in startup, described camera takes pictures, to expose to the sun to described camera deficient and overexposure is tested, obtain described owe to expose to the sun critical point motor position and the critical point motor position of described overexposure.
8. device as claimed in claims 6 or 7, it is characterized in that, described adjustment unit comprises:
Reduce unit, if be positioned within the described critical point motor position owing to expose to the sun for described present motor position, reduce the photosensitivity of described camera, to prevent described photoflash lamp overexposure;
Increase unit, if outside the critical point motor position being positioned at described overexposure for described present motor position, increase the photosensitivity of described camera, owe to expose to the sun to prevent described photoflash lamp.
9. device as claimed in claim 8, is characterized in that, described reduction unit specifically for:
If described present motor position is positioned within the described critical point motor position owing to expose to the sun, the photosensitivity of described camera obtained after adjustment is the ratio that the photosensitivity of described camera is multiplied by described present motor position and the described critical point motor position owing to expose to the sun.
10. device as claimed in claim 8, is characterized in that, described increase unit specifically for:
If described present motor position is positioned at outside the critical point motor position of described overexposure, the photosensitivity of described camera obtained after adjustment is that the photosensitivity of described camera is multiplied by the critical point motor position of described overexposure and the ratio of described present motor position.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410778992.0A CN104506777B (en) | 2014-12-15 | 2014-12-15 | A kind of method and device of control exposure of flash lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410778992.0A CN104506777B (en) | 2014-12-15 | 2014-12-15 | A kind of method and device of control exposure of flash lamp |
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| Publication Number | Publication Date |
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| CN104506777A true CN104506777A (en) | 2015-04-08 |
| CN104506777B CN104506777B (en) | 2017-08-01 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815341A (en) * | 2005-02-06 | 2006-08-09 | 亚洲光学股份有限公司 | Method and system for automatically adjusting flash strength for camera |
| US20070212053A1 (en) * | 2006-03-13 | 2007-09-13 | Kenji Koyama | Image recording apparatus, image recording method, and computer-readable recording medium |
| CN101082755A (en) * | 2006-06-01 | 2007-12-05 | 普立尔科技股份有限公司 | Flashlamps exciting method |
| CN101399924A (en) * | 2007-09-25 | 2009-04-01 | 展讯通信（上海）有限公司 | Automatic exposure method and device based on brightness histogram |
-
2014
- 2014-12-15 CN CN201410778992.0A patent/CN104506777B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1815341A (en) * | 2005-02-06 | 2006-08-09 | 亚洲光学股份有限公司 | Method and system for automatically adjusting flash strength for camera |
| US20070212053A1 (en) * | 2006-03-13 | 2007-09-13 | Kenji Koyama | Image recording apparatus, image recording method, and computer-readable recording medium |
| CN101082755A (en) * | 2006-06-01 | 2007-12-05 | 普立尔科技股份有限公司 | Flashlamps exciting method |
| CN101399924A (en) * | 2007-09-25 | 2009-04-01 | 展讯通信（上海）有限公司 | Automatic exposure method and device based on brightness histogram |
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| CN104506777B (en) | 2017-08-01 |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., Ltd. |