CN103019381B - Control the method for display screen automatic backlight - Google Patents
Control the method for display screen automatic backlight Download PDFInfo
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- CN103019381B CN103019381B CN201210542330.4A CN201210542330A CN103019381B CN 103019381 B CN103019381 B CN 103019381B CN 201210542330 A CN201210542330 A CN 201210542330A CN 103019381 B CN103019381 B CN 103019381B
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Abstract
Control a method for display screen automatic backlight, comprise the following steps: the schedule time of a. before automatic backlight breath screen opens camera; B. the image that camera obtains is carried out ashing; C. by the image binaryzation after ashing; D. predetermined face organ or object whether is had in the image after analysis of binary; If e. have predetermined face organ or object, postpone automatic backlight breath screen, if do not had, return step b until the automatic backlight breath screen time arrives.Compare traditional method being controlled backlight illumination by recognition of face, the present invention more simply and identify user more reliably, can control display screen automatic backlight efficiently and accurately.
Description
Technical field
The present invention relates to a kind of method controlling display screen automatic backlight.
Background technology
Present mobile terminal device such as mobile phone generally has automatic backlight set of time function, if user is in official hour, any operation is not carried out to mobile phone, now backlight can be dimmed, again through still not operating after a while, cease screen (blackening) and screen locking, when but if user browses mobile phone web pages or the information content, there is not any operation to mobile phone, but exceed the time of user's setting, now user does not want to allow mobile phone automatically cease screen, user needs to tap button or touch-screen, then could recovery system setting screen intensity.Particularly user needs to stop for a long time at some desktops, and when not needing system automatic backlight, such experience is very poor.
At present, have and realize the patent documentation of backlight Energy Saving Control as 201210020708.4,201010214931 by recognition of face, but the scheme of recognition of face has a serious defect, necessarily require whole face all within the scope of image capture, just can identify whole face exactly, if the some parts of face are not within the scope of image capture, now system will be difficult to even trouble in human face recognition.On the other hand, user is when reading the content on mobile terminal device, and different people has different use habits, but generally speaking, in most cases, the entirety of user face all can not appear in the image pickup scope of mobile terminal all the time.This just brings very large difficulty to recognition of face, directly affects the accuracy of backlight control, thus affects energy-saving efficiency.
Although patent documentation 201210020708.4 proposes judge in facial image, whether eyes open based on facial image, whether the axial angle of the direction that in facial image, eyes are visual and camera is less than predetermined value, and analyze according to eye image, but its prerequisite to identify whole face, and be remove location human eye based on the facial image identified 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 this mode depending on Face datection, if whole face is not successfully identified and just cannot go to identify human eye.Equally, although patent documentation 201010214931 proposes the Working mode switching method based on human eye feature analysis, but be also first by face detection module device, the image information analysis obtained from video camera has been determined whether that face occurs, just the face information detected is sent to Facial Feature Analysis modular device when being determined with face information, and then human eye information is analyzed.This method obviously also 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 controlling display screen automatic backlight, more simply and identify user more reliably, thus automatic backlight can be controlled efficiently and accurately.
For achieving the above object, the present invention is by the following technical solutions:
Control a method for display screen automatic backlight, comprise the following steps:
A. the schedule time before automatic backlight breath screen opens front-facing camera;
B. the image that camera obtains is carried out ashing;
C. by the image binaryzation after ashing;
D. predetermined face organ or object whether is had in the image after analysis of binary;
If e. have predetermined face organ or object, postpone automatic backlight breath screen, if do not had, return step b until the automatic backlight breath screen time arrives.
Following technical schemes can be adopted further:
Described steps d comprises the following steps:
View data after binaryzation is put in the face organ being cultivated out by classifier methods or object strong classifier, face organ or object detection algorithm coupling is completed by described face organ or object strong classifier, wherein said face organ or object strong classifier train different Weak Classifiers for training set, and the detection coupling for face organ or object that these weak classifier set are got up.
Described sorter is AdaBoost sorter.
Further comprising the steps of:
F. the multiple history images being identified as predetermined face organ or object are recorded;
G. there is the data characteristics of multiple history images of predetermined face organ or object described in basis, generate the simple recognition rule that directly can carry out face organ or article identification according to the image after binaryzation;
In described steps d, in the image after analysis of binary, whether meet described simple judgment rule, think have predetermined face organ or object if met.
Whether the described simple recognition rule setting regions comprised in the picture exists the binaryzation figure matched with the figure setting size and/or shape.
Described simple recognition rule also comprises the time that binaryzation figure appears at respective regions and whether reaches scheduled duration.
Described predetermined face organ is at least one in eye, mouth, nose, ear, described step a, b, c carry out for different face organs in turn by setting order, postpone automatic backlight breath screen when any one predetermined face organ being detected, or until when all predetermined face organs being detected, just postpone automatic backlight breath screen.
Described object is glasses, and described step a, b, c carry out for glasses and face organ in turn by setting order, postpones automatic backlight breath screen when predetermined face organ or glasses being detected.
By restarting automatic backlight breath screen, also the countdown breath screen time postpones automatic backlight breath screen again.
Camera is closed when postponing automatic backlight breath screen.
Advantageous Effects of the present invention:
The present invention does not need the detection doing whole face, but detect for face organ and/or facial object, the identification of people is not to detect premised on face, even if only some face, as long as expose predetermined organ such as eyes or face, even if eyes such as only detected again, also successful identification can be accomplished, not only simplify discriminance analysis process, also because detected object has the independence of height, substantially increase reliability and the accuracy of identification, reduce loss, ensure that the energy-saving effect of display screen.By the present invention, when user checks the content on equipment, do not worry, because the long-time not automatic backlight breath screen to operate, improving Consumer's Experience.
According to preferred embodiment, simple recognition rule can be generated based on the data characteristics of the multiple history images effectively identified, under this simple recognition rule, directly face organ or article identification can be carried out according to the image after binaryzation, for the user having the history using this equipment, image after binaryzation does not need to go to analyze by the detection matching algorithm of complexity, but by the data characteristics of binary image, simple analysis can be carried out and can detect whether have predetermined face organ or object.Such as, judge whether setting regions in the picture exists the binaryzation figure matched with the figure of setting size and/or shape, as whether have the binaryzation figure of similar eyes ad-hoc location in the image that absorbs.Due to a lot of user general oneself use habit and reading habit, when user checks equipment, specific face organ probably always can appear in image pickup scope with specific position, therefore, when detected image, find that in image, the binaryzation figure of certain profile has appearred in this ad-hoc location, then do not need to analyze more accurately further by the image processing techniques such as classifier methods or mode identification method, and directly can infer that this binary image is exactly the specific face organ of user, thus think that user checks equipment.This scheme is equivalent to the use habit of user to record, and identifies user efficiently with having gone " memory ", substantially increases detection speed and reliability.
Detected object can be predetermined face organ, such as, at least one in eye, mouth, nose, ear, carry out in turn for different face organs by setting order, automatic backlight breath screen is postponed when any one predetermined face organ can be detected, guarantee detection efficiency, or until just postpone automatic backlight breath screen when all predetermined face organs being detected, namely guarantee detecting reliability by the detection of associativity.Detected object can also be object, the glasses that such as user's face is worn, and in many situations, detects object convenient and accurate, can improve detection efficiency and accuracy.
Accompanying drawing explanation
Fig. 1 is the process flow diagram that the present invention controls a method embodiment of display screen automatic backlight;
Fig. 2 is the process flow diagram that in an embodiment, face organ detects.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail by the following examples.
Refer to Fig. 1, in some embodiments, the method controlling display screen automatic backlight comprises the following steps:
The schedule time of step a. before automatic backlight breath screen opens front-facing camera;
The image that camera obtains by step b. carries out ashing;
Step c is by the image binaryzation after ashing;
Steps d. whether there are predetermined face organ or object in the image after analysis of binary;
If step e. detects in image predetermined face organ or object, think the information of user now just on browsing apparatus, do not wish now system automatic backlight, the now backlight time of reset system, postpone automatic backlight breath screen, if predetermined face organ or object do not detected, then return step b until the automatic backlight breath screen time arrives.If the automatic backlight breath screen time arrives, automatically cease screen, also can screen locking simultaneously.
As shown in Figure 1, the overall process experience backlight of automatic backlight breath screen is dimmed and cease screen (blackening), and the backlight dimmed time, then equipment turned down backlight illumination automatically.Preferably, the time of unlatching camera is the schedule time before backlight is dimmed, the such as several seconds.If this stage after backlight is dimmed, before automatic backlight breath screen detects predetermined face organ or object, while postponing automatic backlight breath screen, preferably, also display screen is reverted to higher brightness.
Catching according to camera the data obtained can be preview raw view data.
Preferably, in described steps d, view data after binaryzation is put in the face organ's (such as human eye) or object strong classifier being cultivated out by classifier methods, face organ or object detection algorithm coupling is completed by described face organ or object strong classifier, wherein said face organ or object strong classifier train different Weak Classifiers for training set, and the detection coupling for face organ or object that these weak classifier set are got up.
More preferably, described sorter can be AdaBoost sorter.
To analyze and view data after identifying binaryzation can also adopt other image processing methods, such as mode identification method.
In preferred embodiment, the method controlling display screen automatic backlight is further comprising the steps of:
Step f. records the multiple history images being identified as predetermined face organ or object;
Step g. according to the described data characteristics having multiple history images of predetermined face organ or object, generate the simple recognition rule that directly can carry out face organ or article identification according to the image after binaryzation;
In described steps d, in the image after analysis of binary, whether meet described simple judgment rule, think have predetermined face organ or object if met.
In preferred embodiment, whether the described simple recognition rule setting regions comprised in the picture exists the binaryzation figure matched with the figure setting size and/or shape.Described figure can be the general outline of object.
In preferred embodiment, described simple recognition rule also comprises the time that binaryzation figure appears at respective regions and whether reaches scheduled duration, thus improves the reliability detected.
Described predetermined face organ can be at least one in eye, mouth, nose, ear, described step a, b, c carry out for different face organs in turn by setting order, postponing automatic backlight breath screen when can be and any one predetermined face organ be detected, also can be until just postpone automatic backlight breath screen when all predetermined face organs being detected.
It is the testing process that of detected object is complete that Fig. 1 illustrates with human eye.
To detect eye and mouth is combined as example, as shown in Figure 2, this knockdown detection method improves reliability and the precision of detection to the idiographic flow of another embodiment.This flow process comprises the detection combined result detected is uploaded to database, thus 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 setting order, postpones automatic backlight breath screen when predetermined face organ or glasses being detected.Glasses can preferentially detect, and from raising detection efficiency, and simplify testing process.
As shown in Figure 1, can by restart automatic backlight breath screen and again countdown breath the screen time postpone automatic backlight breath screen.
Preferably, camera is closed when 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 in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. control a method for display screen automatic backlight, it is characterized in that, comprise the following steps:
A. the schedule time before automatic backlight breath screen opens front-facing camera;
B. obtain image by camera, the image that camera obtains is carried out ashing;
C. by the image binaryzation after ashing;
D. predetermined face organ or object whether is had in the image after analysis of binary;
If e. have predetermined face organ or object, postpone the time of automatic backlight breath screen, if do not had, turn back to step b until the automatic backlight breath screen time arrives;
F. the multiple history images being identified as predetermined face organ or object are recorded;
G. there is the data characteristics of multiple history images of predetermined face organ or object described in basis, generate the simple recognition rule that directly can carry out face organ or article identification according to the image after binaryzation;
In described steps d, in the image after analysis of binary, whether meet described simple judgment rule, think have predetermined face organ or object if met;
Whether the described simple recognition rule setting regions comprised in the picture exists the binaryzation figure matched with setting size and/or the figure of shape, and described simple recognition rule also comprises the time that binaryzation figure appears at respective regions and whether reaches scheduled duration.
2. the method controlling display screen automatic backlight as claimed in claim 1, it is characterized in that, described predetermined face organ is at least one in eye, mouth, nose, ear, described step a, b, c carry out for different face organs in turn by setting order, postpone automatic backlight breath screen when any one predetermined face organ being detected, or until when all predetermined face organs being detected, just postpone automatic backlight breath screen.
3. the method controlling display screen automatic backlight as claimed in claim 1, 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 setting order, postpones automatic backlight breath screen when predetermined face organ or glasses being detected.
4. the method controlling display screen automatic backlight as claimed in claim 1, is characterized in that, by restarting automatic backlight breath screen, also the countdown breath screen time postpones automatic backlight breath screen again.
5. the method controlling display screen automatic backlight as claimed in claim 1, is characterized in that, closes camera when postponing automatic backlight breath screen.
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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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| CN103019381B true CN103019381B (en) | 2015-09-02 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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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| CN101739116A (en) * | 2008-11-21 | 2010-06-16 | 纬创资通股份有限公司 | Control method and application of backlight module |
| US20110193802A1 (en) * | 2010-02-10 | 2011-08-11 | Samsung Mobile Display Co., Ltd. | Display Module Having Haptic Function |
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| CN101739116A (en) * | 2008-11-21 | 2010-06-16 | 纬创资通股份有限公司 | Control method and application of backlight module |
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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. |