CN103019381A - Method for controlling automatic backlight of display screen - Google Patents
Method for controlling automatic backlight of display screen Download PDFInfo
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- CN103019381A CN103019381A CN2012105423304A CN201210542330A CN103019381A CN 103019381 A CN103019381 A CN 103019381A CN 2012105423304 A CN2012105423304 A CN 2012105423304A CN 201210542330 A CN201210542330 A CN 201210542330A CN 103019381 A CN103019381 A CN 103019381A
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- automatic backlight
- face organ
- backlight
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Abstract
The invention provides a method for controlling the automatic backlight of a display screen. The method for controlling the automatic backlight of the display screen comprises the following steps: a, starting a camera at a predetermined moment before the automatic backlight for screen standby; b, graying a picture obtained by the camera; c, performing binaryzation on the grayed picture; d, analyzing whether predetermined facial organs or objects exist in the binaryzation picture; e, delaying the automatic backlight for screen standby in the case where the predetermined facial organs or objects exist in the picture, and returning to the step b till the arrival of a moment of the automatic backlight for screen standby in the case where no predetermined facial organs or objects exist in the picture. In comparison with the traditional method for controlling backlight brightness through a human face, the method for controlling the automatic backlight of the display screen can enable a user to be identified more simply and more reliably, so that the automatic backlight of the display screen is controlled efficiently and correctly.
Description
Technical field
The present invention relates to a kind of method of control display screen automatic backlight.
Background technology
Present mobile terminal device for example mobile phone generally has automatic backlight set of time function, if the user is in setting time, mobile phone is not carried out any operation, meeting backlight this moment is dimmed, again through after a while still not then breath screen (blackening) and screen locking of operation, when but if the user browses mobile phone web pages or the information content, mobile phone there is not any operation, but surpass the time that the user sets, this moment, the user did not want to allow mobile phone automatically cease screen, the user need to tap button or touch-screen, the screen intensity of then could recovery system setting.Particularly the user need to stop for a long time at some desktops, and when not needing system's automatic backlight, such experience is very poor.
At present, have by recognition of face and realize that the patent documentation of Energy Saving Control backlight is such as 201210020708.4,201010214931, but the scheme of recognition of face has a serious defective, necessarily require exactly whole face all in the image capture scope, just can identify whole people's face, if the some parts of people's face are not in the image capture scope, system will be difficult to even trouble in human face recognition this moment.On the other hand, during the content of user on reading mobile terminal device, different people has different use habits, but generally speaking, in most of situation, the integral body of user face can not appear in the image pickup scope of portable terminal all the time.This has just brought very large difficulty to recognition of face, directly affects the accuracy of backlight control, thereby affects energy-saving efficiency.
Although patent documentation 201210020708.4 has proposed to judge based on facial image whether eyes open in the facial image, whether the axial angle of the visual direction of eyes and camera is less than predetermined value in the facial image, and analyze according to eye image, but its prerequisite is to identify whole people's face, and be based on the facial image that identifies and remove to locate human eye and perform an analysis, therefore, not only detection method is loaded down with trivial details, increase processing time and power consumption, and the more important thing is the mode that this people's of depending on face detects, just can't do not removed to identify human eye if whole people's face successfully identifies.Equally, although patent documentation 201010214931 has proposed the Working mode switching method based on human eye feature analysis, but also be first by people's face detection module device, the image information analysis of obtaining from video camera has been determined whether that people's face occurs, just detected people's face information is sent to the Facial Feature Analysis modular device when being determined with people's face information, and then human eye information is analyzed.This method obviously also exists above-mentioned shortcoming.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of method of control display screen automatic backlight, can identify simpler and more reliably the user, thereby control efficiently and accurately automatic backlight.
For achieving the above object, the present invention is by the following technical solutions:
A kind of method of control display screen automatic backlight may further comprise the steps:
A. the schedule time before automatic backlight breath screen is opened front-facing camera;
B. the image that camera is obtained carries out ashing;
C. with the image binaryzation after the ashing;
D. in the image after the analysis of binary whether predetermined face organ or object are arranged;
If e. predetermined face organ or object are arranged, postpone automatic backlight breath screen, if do not have, return step b until the automatic backlight breath screen time arrives.
Can further adopt following technical schemes:
Described steps d may further comprise the steps:
View data after the binaryzation is put among the face organ or object strong classifier who is cultivated out by classifier methods, finish face organ or object detection algorithm coupling by described face organ or object strong classifier, wherein said face organ or object strong classifier train different Weak Classifiers for training set, and these Weak Classifiers are gathered for the detection of face organ or object coupling.
Described sorter is the AdaBoost sorter.
Further comprising the steps of:
F. record a plurality of history images that are identified as predetermined face organ or object;
G. according to the described data characteristics that a plurality of history images of predetermined face organ or object are arranged, the simple recognition rule of face organ or article identification can be directly carried out according to the image after the binaryzation in generation;
In the described steps d, whether meet described simple judgment rule in the image after the analysis of binary, think that predetermined face organ or object are arranged if meet.
Whether the setting regions that described simple recognition rule is included in the image exists the binaryzation figure that is complementary with the figure of setting size and/or shape.
Described simple recognition rule comprises also whether the time that the binaryzation figure appears at respective regions reaches scheduled duration.
Described predetermined face organ is at least a in eye, mouth, nose, the ear, described step a, b, c carry out for different face organs in turn by the setting order, postpone automatic backlight breath screen when detecting any predetermined face organ, or until just postpone automatic backlight breath screen when detecting all predetermined face organs.
Described object is glasses, and described step a, b, c carry out for glasses and face organ in turn by the setting order, postpones automatic backlight breath screen when detecting predetermined face organ or glasses.
Also the countdown breath screen time postpones automatic backlight breath screen again by restarting automatic backlight breath screen.
Close camera when postponing automatic backlight breath screen.
Useful technique effect of the present invention:
The present invention does not need to do the detection of whole face, but detect for face organ and/or facial object, people's identification is not to detect people's face as prerequisite, even some face only, as long as expose predetermined organ for example eyes or face, even for example only detect again eyes, also can accomplish successful identification, not only simplified the discriminance analysis process, also because detected object has the independence of height, greatly improve reliability and the accuracy of identification, reduced loss, guaranteed the energy-saving effect of display screen.By the present invention, when the user checks content on the equipment, do not worry because for a long time not to operate and automatic backlight breath screen has promoted user's experience.
According to preferred embodiment, can generate simple recognition rule based on the data characteristics of a plurality of history images of effective identification, under this simple recognition rule, can directly carry out face organ or article identification according to the image after the binaryzation, user for the history that this equipment of use is arranged, image after the binaryzation does not need to go to analyze by the detection matching algorithm of complexity, but can by the data characteristics of binary image, simply analyze to detect whether predetermined face organ or object are arranged.For example, judge whether the setting regions in image exists the binaryzation figure that is complementary with the figure of setting size and/or shape, as whether the ad-hoc location of binaryzation figure in the image that absorbs of similar eyes arranged.Because general oneself use habit and the reading habit of a lot of users, when the user checks equipment, specific face organ probably always can appear in the image pickup scope with specific position, therefore, when detected image, the binaryzation figure of certain profile has appearred in this ad-hoc location in the discovery image, then do not need further to analyze more accurately by image processing techniquess such as classifier methods or mode identification methods, and can infer directly that this binary image is exactly user's specific face organ, thereby think that the user checks equipment.This scheme is equivalent to user's use habit is recorded, and has gone to identify efficiently the user " memory ", has greatly improved detection speed and reliability.
Detected object can be the face organ who is scheduled to, at least a in eye, mouth, nose, the ear for example, carry out in turn for different face organs by the setting order, postpone automatic backlight breath screen in the time of can detecting any predetermined face organ, guarantee detection efficiency, or until just postpone automatic backlight breath screen when detecting all predetermined face organs, namely guarantee detecting reliability by the detection of associativity.Detected object can also be object, the glasses worn of user's face for example, and in many situations, it is convenient and accurate to detect object, can improve detection efficiency and accuracy.
Description of drawings
Fig. 1 is the process flow diagram of an embodiment of method of control display screen automatic backlight of the present invention;
Fig. 2 is a process flow diagram that embodiment the inside section organ detects.
Embodiment
By reference to the accompanying drawings the present invention is further described in detail by the following examples.
See also Fig. 1, in some embodiments, the method for control display screen automatic backlight may further comprise the steps:
The schedule time of step a. before automatic backlight breath screen opened front-facing camera;
Step b. carries out ashing with the image that camera obtains;
The image binaryzation of step c after with ashing;
Steps d. whether predetermined face organ or object are arranged in the image after the analysis of binary;
If step e. detects predetermined face organ or object are arranged in the image, think information on browsing equipment user this moment, do not wish system's automatic backlight this moment, this moment reset system time backlight, postpone automatic backlight breath screen, if do not detect predetermined face organ or object, then return step b until the automatic backlight breath screen time arrives.If the automatic backlight breath screen time arrives, automatically breath screen, also simultaneously screen locking.
As shown in Figure 1, the overall process of automatic backlight breath screen experiences dimmed and breath screen (blackening) backlight, and the dimmed time backlight, then equipment was turned down backlight illumination automatically.Preferably, the time of opening camera is in the schedule time before dimmed backlight, for example several seconds.If backlight dimmed after, this stage before the automatic backlight breath screen detects predetermined face organ or object, when postponing automatic backlight breath screen, preferably, also display screen reverted to higher brightness.
Catching the data of obtaining according to camera can be preview raw view data.
Preferably, in the described steps d, view data after the binaryzation is put among the face organ's (for example human eye) or object strong classifier who is cultivated out by classifier methods, finish face organ or object detection algorithm coupling by described face organ or object strong classifier, wherein said face organ or object strong classifier train different Weak Classifiers for training set, and these Weak Classifiers are gathered for the detection of face organ or object coupling.
More preferably, described sorter can be the AdaBoost sorter.
View data after analysis and the identification binaryzation can also adopt other image processing methods, for example mode identification method.
In preferred embodiment, the method for control display screen automatic backlight is further comprising the steps of:
Step f. records a plurality of history images that are identified as predetermined face organ or object;
Step g. according to the described data characteristics that a plurality of history images of predetermined face organ or object are arranged, the simple recognition rule of face organ or article identification can be directly carried out according to the image after the binaryzation in generation;
In the described steps d, whether meet described simple judgment rule in the image after the analysis of binary, think that predetermined face organ or object are arranged if meet.
In preferred embodiment, whether the setting regions that described simple recognition rule is included in the image exists the binaryzation figure that is complementary with the figure of setting size and/or shape.Described figure can be the cardinal principle profile of object.
In preferred embodiment, described simple recognition rule comprises also whether the time that the binaryzation figure appears at respective regions reach scheduled duration, thereby improves the reliability that detects.
Described predetermined face organ can be in eye, mouth, nose, the ear at least a, described step a, b, c carry out for different face organs in turn by the setting order, can be to postpone automatic backlight breath screen when detecting any predetermined face organ, also can be until just postpone automatic backlight breath screen when detecting all predetermined face organs.
Fig. 1 has showed a complete testing process take human eye as detected object.
Be combined as example to detect eye and mouth, the idiographic flow of another embodiment as shown in Figure 2, this knockdown detection method has improved reliability and the precision of detection.This flow process comprises that the detection combined result that will detect uploads to database, thereby can set up described simple recognition rule according to historical data.
In preferred embodiment, described predetermined object is glasses, and described step a, b, c carry out for glasses and face organ in turn by the setting order, postpones automatic backlight breath screen when detecting predetermined face organ or glasses.Glasses can preferentially detect, and from the raising detection efficiency, and simplify testing process.
As shown in Figure 1, can be by restarting automatic backlight breath screen and the countdown breath screen time postpones automatic backlight breath screen again.
Close camera when preferably, postponing automatic backlight breath screen.
Described display screen can be the display screen of mobile phone, panel computer, electric paper book or personal digital assistant device.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the method for a control display screen automatic backlight is characterized in that, may further comprise the steps:
A. the schedule time before automatic backlight breath screen is opened front-facing camera;
B. obtain image by camera, the image that camera is obtained carries out ashing;
C. with the image binaryzation after the ashing;
D. in the image after the analysis of binary whether predetermined face organ or object are arranged;
If e. predetermined face organ or object are arranged, postpone the time of automatic backlight breath screen, if do not have, turn back to step b until the automatic backlight breath screen time arrives.
2. control display as claimed in claim 1 shields the method for automatic backlight, it is characterized in that described steps d may further comprise the steps:
View data after the binaryzation is put among the face organ or object strong classifier who is cultivated out by classifier methods, finish face organ or object detection algorithm coupling by described face organ or object strong classifier, wherein said face organ or object strong classifier train different Weak Classifiers for training set, and these Weak Classifiers are gathered for the detection of face organ or object coupling.
3. the method for control display screen automatic backlight as claimed in claim 2 is characterized in that described sorter is the AdaBoost sorter.
4. such as the method for each described control display screen automatic backlight of claim 1-3, it is characterized in that, further comprising the steps of:
F. record a plurality of history images that are identified as predetermined face organ or object;
G. according to the described data characteristics that a plurality of history images of predetermined face organ or object are arranged, the simple recognition rule of face organ or article identification can be directly carried out according to the image after the binaryzation in generation;
In the described steps d, whether meet described simple judgment rule in the image after the analysis of binary, think that predetermined face organ or object are arranged if meet.
5. the method for control display screen automatic backlight as claimed in claim 4 is characterized in that, whether the setting regions that described simple recognition rule is included in the image exists the binaryzation figure that is complementary with the figure of setting size and/or shape.
6. the method for control display as claimed in claim 5 screen automatic backlight is characterized in that, described simple recognition rule comprises also whether the time that the binaryzation figure appears at respective regions reaches scheduled duration.
7. the method for shielding automatic backlight such as each described control display of claim 1-6, it is characterized in that, described predetermined face organ is at least a in eye, mouth, nose, the ear, described step a, b, c carry out for different face organs in turn by the setting order, postpone automatic backlight breath screen when detecting any predetermined face organ, or until just postpone automatic backlight breath screen when detecting all predetermined face organs.
8. the method for shielding automatic backlight such as each described control display of claim 1-6, it is characterized in that, described object is glasses, and described step a, b, c carry out for glasses and face organ in turn by the setting order, postpones automatic backlight breath screen when detecting predetermined face organ or glasses.
9. such as the method for each described control display screen automatic backlight of claim 1-6, it is characterized in that also the countdown breath screen time postpones automatic backlight breath screen again by restarting automatic backlight breath screen.
10. such as the method for each described control display screen automatic backlight of claim 1-6, it is characterized in that, close camera when postponing automatic backlight breath screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210542330.4A CN103019381B (en) | 2012-12-14 | 2012-12-14 | Control the method for display screen automatic backlight |
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| CN201210542330.4A CN103019381B (en) | 2012-12-14 | 2012-12-14 | Control the method for display screen automatic backlight |
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| CN103019381A true CN103019381A (en) | 2013-04-03 |
| CN103019381B CN103019381B (en) | 2015-09-02 |
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Cited By (5)
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| CN104460985A (en) * | 2014-10-23 | 2015-03-25 | 上海天奕达电子科技有限公司 | Automatic backlighting continuation method, system and terminal based on face recognition |
| CN104866082A (en) * | 2014-02-25 | 2015-08-26 | 北京三星通信技术研究有限公司 | User behavior based reading method and device |
| CN107707751A (en) * | 2017-09-28 | 2018-02-16 | 努比亚技术有限公司 | Video playback electricity saving method and corresponding mobile terminal |
| CN109597599A (en) * | 2018-12-03 | 2019-04-09 | 郑州云海信息技术有限公司 | A kind of control method of display screen, device, equipment and storage medium |
| CN112328069A (en) * | 2020-11-26 | 2021-02-05 | 广东小天才科技有限公司 | Power consumption control method and device of liquid crystal display module and electronic equipment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104866082A (en) * | 2014-02-25 | 2015-08-26 | 北京三星通信技术研究有限公司 | User behavior based reading method and device |
| CN104866082B (en) * | 2014-02-25 | 2019-03-26 | 北京三星通信技术研究有限公司 | The method and apparatus read based on user behavior |
| CN104460985A (en) * | 2014-10-23 | 2015-03-25 | 上海天奕达电子科技有限公司 | Automatic backlighting continuation method, system and terminal based on face recognition |
| CN104460985B (en) * | 2014-10-23 | 2017-09-26 | 上海卓易科技股份有限公司 | One kind continues backlight approach, system and terminal automatically based on recognition of face |
| CN107707751A (en) * | 2017-09-28 | 2018-02-16 | 努比亚技术有限公司 | Video playback electricity saving method and corresponding mobile terminal |
| CN109597599A (en) * | 2018-12-03 | 2019-04-09 | 郑州云海信息技术有限公司 | A kind of control method of display screen, device, equipment and storage medium |
| CN112328069A (en) * | 2020-11-26 | 2021-02-05 | 广东小天才科技有限公司 | Power consumption control method and device of liquid crystal display module and electronic equipment |
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| CN103019381B (en) | 2015-09-02 |
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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. |
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