CN102298500A - Self-adaptive screen zooming adjusting method - Google Patents
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Abstract
The invention discloses a self-adaptive screen zooming adjusting method, which comprises the following steps of: acquiring a face video, analyzing an image frame after frame, judging a triggering condition and performing self-adaptive zooming adjusting; setting preset parameters before first use: if a user thinks that the content size of a user interaction interface of a mobile computing terminal is appropriate, setting a current pixel value FFL obtained in a step (2) as a preset pixel value FFLCS, wherein the value of a tolerance limit FFL sigma is 0 or a value which is less than or equal to 50 percent of the preset pixel value FFLCS; and performing self-adaptive zooming adjusting: comparing the current pixel value FFL obtained in the step (2) with the preset pixel value FFLCS and the tolerance limit FFL sigma set in a step (3), repeating steps (1), (2), (4) and (5), and performing screen zooming adjusting till the user thinks that the content size of the user interaction interface of the mobile computing terminal is appropriate. According to the method, self-adaptive adjustment can be performed according to the physical size, resolution and eye-screen distance of a screen as well as the requirements of a person, so that the requirements of human engineering are met, and the man-machine interaction efficiency is increased.
Description
Technical field
The invention belongs to the mobile terminal device technology, be specifically related to a kind of based on the self-adaptation screen scaling method of adjustment of face feature zone identification with length computation.
Background technology
Use mobile phone in reality, panel computer, super mobile computer, during mobile computing terminal devices such as notebook, because the Support Position disunity of mobile device, different paropion spacings have been caused, when for example sitting down, mobile device can be positioned on the little table before above-knee or the aircraft seat, can only singlehandedly take the equipment of holding when walking or standing, if at this moment browse the webpage of different content amount or the photo of different resolution again, just need be under different paropion spacings convergent-divergent screen content size, to average out between the layout density that presents at graphic user interface and the content visual size.Realize the convergent-divergent of screen content size for the convenience of the user, in the conventional method, or adopt multiple point touching,, or enable the manual adjustments mode of dwindling button and starting keyboard shortcut of amplifying as the iphone4 and the itouch4 product of U.S. Apple.This manual adjustments has two deficiencies: the first, can not reach user's self-demand and carry out the self-adaptation adjustment according to different physical sizes, resolution, the paropion spacing of screen; Second, the manual adjustments convergent-divergent almost all relies on finger, the particularly operation of thumb and forefinger, give some can only one-handed performance or disabled user caused certain inconvenience, at least require two fingers to operate simultaneously such as the multiple point touching scaling pictures, button screen convergent-divergent webpage then needs accurate button click and whether clicks success with an eye affirmation, and this manual adjustments makes the man-machine interaction inefficiency.
Summary of the invention
Purpose of the present invention is exactly in order to overcome above-mentioned the deficiencies in the prior art, and provide a kind of based on the self-adaptation screen scaling method of adjustment of face feature zone identification with length computation, this method can be according to physical size, resolution, the paropion spacing of screen, and people's self-demand carries out the self-adaptation adjustment, do not depend on finger unduly, to meet the ergonomics demand, improve man-machine interaction efficient.
Self-adaptation screen scaling method of adjustment involved in the present invention, its step is as follows:
1) gathers face's video: face's video of that carry by mobile device or external camera collection mobile computing terminal user, the mobile computing terminal comprises mobile phone, panel computer, super mobile computer UMPC, notebook, camera comprises the preposition camera of mobile computing terminal and the external camera of mobile computing terminal;
2) analysis image frame by frame: in camera video captured frame, by realize real-time human eye location based on the AdaBoost cascade classifier of Haar-like feature, identify face feature zone length 1, it is the gap length of right and left eyes pupil center, perhaps 2, be the gap length at the canthus, the outside of right and left eyes, and be that unit counts current pixel value with the pixel
FFL
Need be determined or be revised the initial parameter value of acquiescence when 3) using for the first time by the user, initial parameter comprises the presetted pixel value
FFL CS , tolerance value
FFL δ , touch location
WWith lasting duration of contact
TIf the user thinks when the User Interface size of contents of mobile computing terminal is suitable, with the 2nd) current pixel value that obtains of step
FFLBe set to the presetted pixel value
FFL CS , tolerance value
FFL δ Value be 0 or smaller or equal to 50% presetted pixel value
FFL CS Value, touch location
WBe the screen position that finger contacts with screen, default value is four angles of screen, continues duration of contact
TBeing meant the time that finger contacts with screen, is unit with the second;
4) judge trigger condition: when mobile phone cam detects face feature zone 1 or 2, if satisfy " finger continues to contact with screen " condition this moment, then enter the 5th) step, " finger continues to contact with screen " is meant that one or more fingers and screen continue to contact touch location
WWith lasting duration of contact
TAccording to the 3rd) initial value in step limits;
5) self adaptive pantographic adjustment: with the 2nd) go on foot the current pixel value that obtains
FFLWith the 3rd) the presetted pixel value that is provided with of step
FFL CS And tolerance value
FFL δ Compare,
Current pixel value when the face feature zone length
FFLPresetted pixel value greater than the face feature zone length
FFL CS Add tolerance value
FFL δ , promptly
FFL FFL CS + FFL δ The time, the graphic user interface content element is dwindled adjustment, this dwindles the tolerance value of the adjustment mode and the adjustment degree basis of adjustment
FFL δ And convergent-divergent is adjusted coefficient
F=
Characterized, the graphic user interface content element comprises window, menu, icon, cursor pointer, character, figure, realization is dwindled to adjust two kinds of methods, first kind is by calling the api function of current operation system, to increase the Pixel Dimensions that operating system PPI number (Pixels Per Inch) reduces the graphic user interface content element, graphic user interface itself does not dwindle and still takes whole screen scope, second kind is by calling the graphic plotting function of current operation system, with the on-screen display (osd) area sectional drawing and dwindle display size;
Current pixel value when the face feature zone length
FFLPresetted pixel value less than the face feature zone length
FFL CS Subtract tolerance value
FFL δ , promptly
FFL＜
FFL CS -FFL δ The time, the graphic user interface content element is amplified adjustment, adjustment mode that this amplification is adjusted and adjustment degree are according to tolerance value
FFL δ And convergent-divergent is adjusted coefficient
F=
Characterized, realize amplifying adjusting two kinds of methods are arranged, first kind is by calling the current operation system api function, increase graphic user interface content element Pixel Dimensions to reduce operating system PPI number, graphic user interface itself does not amplify and still takes whole screen scope, second kind by calling the graphic plotting function of current operation system, and with the on-screen display (osd) area sectional drawing and increase display size, graphic user interface itself also amplifies simultaneously and exceeds the screen scope.
6) repeat 1) 2) 4) 5) step, carry out the screen scaling adjustment, till the user thinks that the User Interface size of contents of mobile computing terminal is suitable.
The above-mentioned the 5th) adjustment mode described in the step and adjustment degree are meant when the 3rd) tolerance value that is provided with of step
FFL δ ≠ 0 o'clock, the adjustment mode was direct convergent-divergent, and directly the adjustment degree of convergent-divergent is pressed convergent-divergent and adjusted coefficient
F=
The actual computation value carry out.
The above-mentioned the 5th) adjustment mode described in the step and adjustment degree can also be when the 3rd) tolerance value that is provided with of step
FFL δ =0 o'clock, the adjustment mode was gradual convergent-divergent, with whenever
TThe speed convergent-divergent of/100 seconds 10 pixels is if convergent-divergent is adjusted coefficient
F=
Value then adopts gradual amplification gradually, if convergent-divergent is adjusted coefficient greater than 1
F=
Value is less than 1, then adopts gradually to dwindle gradually, till the user is satisfied.
Self-adaptation screen scaling method of adjustment involved in the present invention can be according to physical size, resolution, the paropion spacing of screen, and the self-demand that reaches the people carries out the self-adaptation adjustment, to meet the ergonomics demand, has improved man-machine interaction efficient.
Description of drawings
Fig. 1 is two kinds of situation synoptic diagram of face feature zone length.
1 gap length that refers to right and left eyes pupil center wherein, 2 refer to the gap length at the canthus, the outside of right and left eyes.
Fig. 2 is current pixel value, the presetted pixel value of face feature zone length, the tolerance value of face feature zone length of the present invention, and screen scaling adjust between the graph of a relation of logic.
Wherein:
l
FFL: the current pixel value of face feature zone length;
l
FFL CS : the presetted pixel value of face feature zone length;
l
FFL δ : tolerance value, the value of this value are to equal 0, perhaps smaller or equal to the presetted pixel value of 50% face feature zone length.
Embodiment
The present invention is further described as follows below in conjunction with drawings and Examples:
Fig. 1 is two kinds of situation synoptic diagram of face feature zone length, as shown in Figure 1,1 gap length that is meant right and left eyes pupil center among Fig. 1,2 are meant the gap length at the canthus, the outside of right and left eyes.The face feature zone length can be with 1 or 2.
Screen scaling adjustment process of the present invention as shown in Figure 2.Being divided into following three phases carries out:
(a) phase one, FFL surveys.At first carry out the current pixel value of face feature zone length
FFLDetection: this surveys the preposition camera by the mobile computing terminal device, perhaps the peripheral hardware camera that is connected with the mobile computing terminal device carries out, in the image that camera is caught, by the human eye location algorithm, detect face feature zone length 1 or 2, and be that unit counts with the pixel
FFLIn the following embodiments, we adopt based on the AdaBoost cascade classifier of Haar-like feature and realize real-time human eye location.
(b) secondly, obtain in detection
FFLAfter, if use for the first time, also need to be provided with the presetted pixel value
FFL CS , tolerance value
FFL δ , touch location
WWith lasting duration of contact
TThe user thinks when the User Interface size of contents (system font width) of mobile computing terminal is suitable, the current pixel value that step (a) is obtained
FFLBe set to preset value
FFL CS , the tolerance value in the following examples 1
FFL δ Be set at the presetted pixel value of 50% face feature zone length, tolerance value among the embodiment 2
FFL δ Be set at 0.At this moment, trigger the condition that starts zoom function, then begin screen is carried out convergent-divergent as required, trigger the condition that starts zoom function and can finish by following manner if satisfy:
(1) a plurality of fingers continue to contact (being multiple point touching) with screen, in embodiment 1, and touch location
WBe positioned at screen left and right sides inferior horn, promptly need two fingers touch screen left and right sides inferior horn simultaneously;
(2) fingers continue to contact (being single-point touches) with screen, at embodiment 2, touch location
WBe positioned at the screen lower right corner.
(c) shown in the A among Fig. 2, B, C, will
FFLPresetted pixel value with the face feature zone length
FFL CS , and tolerance value
FFL δ Compare, according to comparative result, graphic user interface is carried out convergent-divergent adjustment operation, this stage is divided into three kinds of situations again:
(1) shown in the A among Fig. 2, when the current pixel value of face feature zone length adds tolerance value greater than the presetted pixel value of face feature zone length, the graphic user interface content element is dwindled adjustment.Be FFL 〉
FFL CS +
FFL δ Shi Jinhang dwindles adjustment.
(2) shown in the B among Fig. 2, when the current pixel value of characteristic area length subtracts tolerance value less than the presetted pixel value of face feature zone length, the graphic user interface content element is amplified adjustment.Be FFL＜
FFL CS -FFL δ Shi Jinhang amplifies adjustment.
(3) shown in the C among Fig. 2, when the current pixel value of characteristic area length, subtract tolerance value greater than the presetted pixel value of face feature zone length, and when adding tolerance value less than the presetted pixel value of face feature zone length, promptly
FFL CS -FFL δ ＜FFL＜
FFL CS + FFL δ The graphic user interface content element is not amplified and dwindle adjustment.
(d) carry out the convergent-divergent adjustment, in this stage according to the tolerance value of setting
FFL δ Whether be that the different convergent-divergent of 0 execution is adjusted mode, the adjustment degree is adjusted coefficient with convergent-divergent
FCharacterized, convergent-divergent is adjusted coefficient
FComputing formula suc as formula being:
F=
When
FFL δ≠ 0 o'clock, adopt direct scalable manner, with reality
F= 
Doubly directly amplify or directly dwindle, the result of convergent-divergent adjustment process is: the current pixel value of face feature zone length equals the presetted pixel value of face feature zone length, promptly
FFL=
FFL CSWhen
FFL δ=0 o'clock, adopt gradual scalable manner, the speed of convergent-divergent need be used and continue duration of contact gradually
T, with the speed convergent-divergent of every T/100 pixel seconds 10, if F〉and 1, then carry out gradual amplification adjustment, if the gradual adjustment of dwindling is then carried out in F＜1, till the user is satisfied.
This example is that example illustrates screen scaling adjustment process of the present invention with the iphone4/itouch4 of Apple.The screen resolution of itouch4 is 960 * 640 pixels, and screen size is 3.5 inches, and promptly screen length is 7.6 centimetres, and wide is 5 centimetres.
At first, when the first use of certain user screen scaling of the present invention is adjusted function, need carry out the initialization setting, this setting is provided with the interface realization by the preposition camera of iphone4 and supporting man-machine interaction screen content size.When this was provided with the interface in operation, in this example, the demonstration length of interocular distance in screen that the camera detecting obtains these user's eyes was 1.6 centimetres, and promptly the current pixel value of face feature zone length 1 is 204.8
FFLIf it is suitable that this user this moment thinks that this is provided with the shown content size in interface, then this user is provided with the interface by this, with the presetted pixel value of face feature zone length at this moment
FFL CS Be defined as 204.8
FFL, and get
FFL δ Value is 50% presetted pixel value
FFL CS , promptly
FFL δ =102.4
FFL,Contact position
WBe positioned at the left and right sides inferior horn of screen, the sustained touch time
TBe set at 3 seconds.
Secondly, when the user takes train at certain, he will hand iphone4 and be positioned on the little table before seat, and user's head is close to the chair back and is felt more comfortable, this moment is longer when paropion gap ratio user uses at ordinary times, so, when browsing text such as e-book, webpage, can think that text font and interface button are too little when his answer short message.So, he continues face contact with left-hand finger in the screen lower right corner, started the software of being carried that self adaptive pantographic is adjusted function that has after 3 seconds, the preposition camera Auto-Sensing that this software carries by iphone4 is to the current pixel value of face characteristic zone length 1
FFLBe 64
FFL, at this moment
FFL＜
FFL CS -FFL δ , i.e. 64＜204.8-102.4, software learns that automatically graphic user interface need amplify adjustment, because
FFL δ Be not 0, convergent-divergent is adjusted coefficient
F=204.8/64=3.2, promptly need to amplify 3.2 times, the api function of software transfer this moment apple iOS operating system, PPI (the pixel per inch when reducing screen drawing, the per inch pixel count) number increases graphic user interface content element Pixel Dimensions, reaches
FFL=FFL CS The time amplification process finish.
The man-machine interaction efficient of this embodiment is described as follows:
Before amplifying adjustment, on the interactive interface of iphone4 screen, carry out the indication of 40x40 pixel target and test alternately, can get mutual performance according to Fitts ' Model Calculation experimental result and be: traveling time MT=1.6s, error rate ER=37%, performance bandwidth TP=1.2bps;
After amplifying adjustment, to the mutual performance of the indication of same target be: traveling time MT=0.9s, error rate ER=18%, performance bandwidth TP=5.6bps;
Present embodiment has been realized amplifying according to different paropion spacing, screen resolution and people's self-demand and has been adjusted, and meets the ergonomics demand fully, reduces artificial amplifieroperation, has improved man-machine interaction efficient.
The user stands when certain takes bus and uses iphone4, and user one pulled and held the public transport draw ring this moment, on the other hand operating handset.When he browses photo, want to see the more detail section of photo, promptly subjectively think enlarged photograph.So the user pins the lower right corner of screen earlier with thumb, started the software that has the self adaptive pantographic adjustment function of being put forward after 3 seconds, but this moment, user's thumb did not leave contact position immediately
W, the user allows screen away from eyes subsequently, and the people dwindles for causing the paropion spacing, and this moment, software detected current
FFLBecome 100
FFL, this moment 100＜204.8
,Promptly
FFL＜
FFL CS , because
FFL δ Be 0, then this moment zoom factor
F=204.8/100=2.048〉1, software learns that the user needs enlarging function, then calls the graphic plotting function of current iOS operating system, because the sustained touch time
TBe set at 3 seconds, then amplify picture gradually, in the process of amplifying gradually, when the user thinks that photo has been amplified to suitable dimension, then unclamps the touch location of pinning with the speed of per 30 millisecond of 10 pixel
WFinger, further screen or zoom out eyes this moment, the photo content size all no longer changes.In like manner, when he wants to dwindle the current photo size of browsing, continue the face contact position
WStart software, near eyes, cause the paropion spacing to amplify screen, this moment, software detected current
FFLBe 400
FFL, promptly
FFL FFL CS , because
FFL δ Be 0, then this moment zoom factor
F=204.8/400=0.512＜1, software learn that the user needs reduction capability, then with the speed of per 30 millisecond of 10 pixel current photo are dwindled gradually, when the user thinks that photo narrows down to suitable dimension, then unclamp the touch location of pinning
WFinger, further screen or zoom out eyes this moment, the photo content size all no longer changes.
Present embodiment has been realized amplifying according to the resolution of screen content and people's self-demand and has been adjusted and dwindle adjustment, meets the ergonomics demand fully, reduces artificial zoom operations, and occasion that can only one-handed performance at some has improved man-machine interaction efficient.
Claims (3)
1. self-adaptation screen scaling method of adjustment is characterized in that step is as follows:
The first step is gathered face's video: face's video of that carry by mobile device or external camera collection mobile computing terminal user, the mobile computing terminal comprises mobile phone, panel computer, super mobile computer UMPC, notebook, camera comprises the preposition camera of mobile computing terminal and the external camera of mobile computing terminal;
Second goes on foot analysis image frame by frame: in camera video captured frame, by realize real-time human eye location based on the AdaBoost cascade classifier of Haar-like feature, identify face feature zone length 1, it is the gap length of right and left eyes pupil center, perhaps 2, be the gap length at the canthus, the outside of right and left eyes, and be that unit counts current pixel value with the pixel
FFL
Need be determined or be revised the initial parameter value of acquiescence when the 3rd step used for the first time by the user, initial parameter comprises the presetted pixel value
FFL CS , tolerance value
FFL δ , touch location
WWith lasting duration of contact
TIf the user thinks when the User Interface size of contents of mobile computing terminal is suitable, with the 2nd) current pixel value that obtains of step
FFLBe set to the presetted pixel value
FFL CS , tolerance value
FFL δ Value be 0 or smaller or equal to 50% presetted pixel value
FFL CS Value, touch location
WBe the screen position that finger contacts with screen, default value is four angles of screen, continues duration of contact
TBeing meant the time that finger contacts with screen, is unit with the second;
The 4th step was judged trigger condition: when mobile phone cam detects face feature zone 1 or 2, if satisfy " finger continues to contact with screen " condition this moment, then enter the 5th) step, " finger continues to contact with screen " is meant that one or more fingers and screen continue to contact touch location
WWith lasting duration of contact
TAccording to the 3rd) initial value in step limits;
The 5th step self adaptive pantographic adjustment: with the 2nd) goes on foot the current pixel value that obtains
FFLWith the 3rd) the presetted pixel value that is provided with of step
FFL CS And tolerance value
FFL δ Compare,
Current pixel value when the face feature zone length
FFLPresetted pixel value greater than the face feature zone length
FFL CS Add tolerance value
FFL δ , promptly
FFL FFL CS + FFL δ The time, the graphic user interface content element is dwindled adjustment, this dwindles the tolerance value of the adjustment mode and the adjustment degree basis of adjustment
FFL δ And convergent-divergent is adjusted coefficient
F=
Characterized, the graphic user interface content element comprises window, menu, icon, cursor pointer, character, figure, realization is dwindled to adjust two kinds of methods, first kind is by calling the api function of current operation system, to increase the Pixel Dimensions that operating system PPI number (Pixels Per Inch) reduces the graphic user interface content element, graphic user interface itself does not dwindle and still takes whole screen scope, second kind is by calling the graphic plotting function of current operation system, with the on-screen display (osd) area sectional drawing and dwindle display size;
Current pixel value when the face feature zone length
FFLPresetted pixel value less than the face feature zone length
FFL CS Subtract tolerance value
FFL δ , promptly
FFL＜
FFL CS -FFL δ The time, the graphic user interface content element is amplified adjustment, adjustment mode that this amplification is adjusted and adjustment degree are according to tolerance value
FFL δ And convergent-divergent is adjusted coefficient
F=
Characterized, realize amplifying adjusting two kinds of methods are arranged, first kind is by calling the current operation system api function, increase graphic user interface content element Pixel Dimensions to reduce operating system PPI number, graphic user interface itself does not amplify and still takes whole screen scope, second kind by calling the graphic plotting function of current operation system, and with the on-screen display (osd) area sectional drawing and increase display size, graphic user interface itself also amplifies simultaneously and exceeds the screen scope;
The 6th step repeat first, second, third and fourth, five steps, carry out the screen scaling adjustment, till the user thinks that the User Interface size of contents of mobile computing terminal is suitable.
2. self-adaptation screen scaling method of adjustment according to claim 1 is characterized in that adjustment mode and the adjustment degree in above-mentioned the 5th step is meant the tolerance value that is provided with when the 3rd step
FFL δ ≠ 0 o'clock, the adjustment mode was direct convergent-divergent, and directly the adjustment degree of convergent-divergent is pressed convergent-divergent and adjusted coefficient
F=
The actual computation value carry out.
3. self-adaptation screen scaling method of adjustment according to claim 1 is characterized in that adjustment mode described in above-mentioned the 5th step and adjustment degree are the tolerance values that is provided with when the 3rd step
FFL δ =0 o'clock, the adjustment mode was gradual convergent-divergent, with per percent
TThe speed convergent-divergent of second 10 pixels is if convergent-divergent is adjusted coefficient
F=
Value then adopts gradual amplification adjustment greater than 1, if convergent-divergent is adjusted coefficient
F=
Value then adopts the gradual adjustment of dwindling less than 1, till the user is satisfied.
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