CN103051795B - Method for switching front camera and rear camera of mobile terminal and mobile terminal - Google Patents
Method for switching front camera and rear camera of mobile terminal and mobile terminal Download PDFInfo
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- CN103051795B CN103051795B CN201210552930.9A CN201210552930A CN103051795B CN 103051795 B CN103051795 B CN 103051795B CN 201210552930 A CN201210552930 A CN 201210552930A CN 103051795 B CN103051795 B CN 103051795B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 210000001508 eye Anatomy 0.000 claims abstract description 86
- 230000001815 facial effect Effects 0.000 claims description 65
- 210000005252 bulbus oculi Anatomy 0.000 claims description 45
- 210000003128 head Anatomy 0.000 claims description 35
- 238000001514 detection method Methods 0.000 claims description 21
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000005728 strengthening Methods 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 4
- 238000009416 shuttering Methods 0.000 claims description 4
- 241000287181 Sturnus vulgaris Species 0.000 description 5
- 238000010295 mobile communication Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The invention discloses a method for switching a front camera and a rear camera of a mobile terminal, and the method comprises the following steps of (1) turning on the front camera and the rear camera of the mobile terminal; (2) collecting a face image through the front camera; (3) repeatedly detecting and recording positions of eyes in each face image; (4) judging whether the eyes look at the front camera or not according to the recorded eye positions, and judging whether the duration for the eyes to look at the front camera is n times of the period for collecting the face image, wherein n is more than 1; (5) if the duration is n times of the period for collecting the face image, controlling the rear camera to be switched to the front camera; and collecting the face image through the front camera, detecting the looking direction of the eyes, controlling the rear camera to be switched to the front camera after the duration for the eyes to look at the front camera reaches the given duration, so that more convenient and rapid switching from the rear camera to the front camera can be realized, more convenient operation can be realized, and the user experience can be improved. The invention also discloses a mobile terminal capable of automatically switching the front camera and the rear camera.
Description
Technical field
The present invention relates to field of mobile terminals, relate in particular to a kind of changing method and this mobile terminal of mobile terminal front camera and rear camera.
Background technology
Fast development along with mobile communication, hand-held mobile terminal is more and more to intelligentized future development, for example at present touch screen type smart mobile phone or panel computer, its function is also more and more, operate more and more easylier, and along with the increase of user's demand, the application program that described mobile communication terminal has is also more and more, described mobile communication terminal is not to be used for merely meeting connecting each other of people already, more becomes mobile personal recreation terminal very important in people's daily life.
Take smart mobile phone as example, and current smart mobile phone is substantially all furnished with former and later two cameras, in use, can switch mutually use.In our actual use, when we open post-positioned pick-up head and carry out preview and take pictures, because mobile phone screen is larger, need both hands just can hold to prevent mobile phone shake with a firm grip, if there is the situation that need to use front-facing camera to take pictures, need to vacate a hand and remove to carry out relevant handover operation, such one-handed performance bothers user very much.
Therefore, be necessary to provide changing method and the mobile terminal thereof of a kind of post-positioned pick-up head easy and simple to handle to front-facing camera, to overcome the deficiencies in the prior art.
Summary of the invention
The object of the present invention is to provide a kind of direction of gaze that detects eye by front-facing camera to realize post-positioned pick-up head to the changing method of front-facing camera, thereby be easy to operate, promote user and experience.
Another object of the present invention is to provide a kind of direction of gaze that detects eye by front-facing camera to realize the mobile terminal that post-positioned pick-up head switches to front-facing camera, thereby be easy to operate, promote user and experience.
For achieving the above object, technical scheme of the present invention is: a kind of changing method of mobile terminal front camera and rear camera is provided, and it comprises the steps:
(1) open front-facing camera and the post-positioned pick-up head of mobile terminal;
(2) front-facing camera gathers facial image;
(3) duplicate detection record the position of human eye in each facial image;
(4) according to the position of human eye of record, judge whether human eye watches front-facing camera attentively, and whether the duration that judges people's eye fixation front-facing camera be to gather n times of facial image cycle, wherein, n is greater than 1;
(5) if so, control post-positioned pick-up head and switch to front-facing camera.
Particularly, described step (3) comprises the steps:
(31) obtain the facial image that front-facing camera gathers;
(32) described facial image is divided into a two-dimensional coordinate;
(33) described facial image is strengthened to contrast;
(34) set up the circular shuttering that Radius is R;
(35) from strengthening the origin of coordinates of the described facial image contrast, start from left to right, from up to down scan, and scanning stepping is 2R;
(36) judgement take scanning element in the border circular areas that the center of circle, R are radius gray value a little whether be greater than the gray value of eyeball, and judge outside described border circular areas gray value a little whether be less than the gray value of eyeball;
(37) if so, judge that described border circular areas overlaps with the eyeball of human eye, and the central coordinate of circle that records described border circular areas is eyeball center; Otherwise, carry out step (35).
Particularly, described step (1) also comprises before:
The cycle of facial image that gathers, the cycle of detection position of human eye are set.
Preferably, described radius R is the assembly average of the radius of human eye eyeball.
Compared with prior art, changing method due to mobile terminal front camera and rear camera of the present invention, by front-facing camera, gather facial image, detect the direction of gaze of human eye to judge whether human eye watches front-facing camera attentively, and the duration that judges people's eye fixation front-facing camera reaches after certain time length, control post-positioned pick-up head and switch to front-facing camera, make post-positioned pick-up head more convenient, quick to the switching of front-facing camera, easy to operate, thereby improve user, experience.
Accordingly, the present invention also discloses the mobile terminal that a kind of front camera and rear camera can automatically switch, and it comprises post-positioned pick-up head, front-facing camera, detection module, judge module and control module, and described post-positioned pick-up head is used for carrying out backward taking pictures; Described front-facing camera is used for gathering facial image and carries out forward direction and take pictures; Described detection module is for detection of position of human eye; Described judge module is used for judging whether human eye watches front-facing camera attentively, and the duration that judges people's eye fixation front-facing camera be whether gather the facial image cycle n doubly, wherein, n is greater than 1; Described control module is for sending according to the judged result of judge module the order that post-positioned pick-up head is switched to front-facing camera.
Preferably, the mobile terminal that described front camera and rear camera can automatically switch also comprises module is set, its for arranging, gather facial image cycle, detect cycle of position of human eye.
Preferably, the mobile terminal that described front camera and rear camera can automatically switch also comprises memory module, and it gathers the cycle of facial image, the facial image collecting, the cycle of detecting position of human eye and the position of human eye coordinate detecting for storing front-facing camera.
Compared with prior art, the mobile terminal that can automatically switch due to front camera and rear camera of the present invention, by front-facing camera, gather facial image, detect the direction of gaze of human eye to judge whether human eye watches front-facing camera attentively, and the duration that judges people's eye fixation front-facing camera reaches after certain time length, control post-positioned pick-up head and switch to front-facing camera, make post-positioned pick-up head more convenient, quick to the switching of front-facing camera, easy to operate, thereby improve user, experience.
Accompanying drawing explanation
Fig. 1 is the flow chart of the changing method of mobile terminal front camera and rear camera of the present invention.
Fig. 2 is the sub-process figure of step S03 in Fig. 1.
Fig. 3 is the screen coordinate schematic diagram of the front camera and rear camera of the present invention mobile terminal that can automatically switch.
Fig. 4 is the structured flowchart of the front camera and rear camera of the present invention mobile terminal that can automatically switch.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, in accompanying drawing, similarly element numbers represents similar element.The changing method of mobile terminal front camera and rear camera provided by the invention and this mobile terminal, by front-facing camera, gather facial image, and the direction of gaze that detects human eye is to judge whether human eye watches front-facing camera attentively, and the duration that judges people's eye fixation front-facing camera reaches after certain time length, control post-positioned pick-up head and switch to front-facing camera, make post-positioned pick-up head more convenient, quick to the switching of front-facing camera, easy to operate, thereby improve user, experience.
As shown in Figure 1, Fig. 1 is the flow chart of the changing method of mobile terminal front camera and rear camera of the present invention, and the method comprises the steps:
Step S01: front-facing camera and the post-positioned pick-up head of opening mobile terminal; Particularly, open post-positioned pick-up head and take pictures, post-positioned pick-up head is preview mode, and meanwhile, front-facing camera is also opened, but on screen, does not show preview screen.
Step S02: front-facing camera gathers facial image; Particularly, front-facing camera removes to gather facial image according to the period of time T 1 arranging.Wherein, man face image acquiring cycle T 1 can artificially regulate.
Step S03: duplicate detection also records the position of human eye in each facial image; Particularly, for example, detection module at the inner detection position of human eye arranging of mobile terminal (mobile phone), it removes to detect the position of human eye in each facial image collecting according to the cycle of man face image acquiring (also according to period of time T 1), and the position of human eye detecting is carried out to record, the duration of its detection is T2, wherein, T2≤T1.
S04: judge according to the position of human eye of record whether human eye watches front-facing camera attentively, and whether the duration that judges people's eye fixation front-facing camera be to gather n times of facial image cycle, wherein, n is greater than 1; For example, the duration that judgement people eye fixation front-facing camera is set is T3, T3=n*T(n > 1), after judging people's eye fixation front-facing camera, at the duration that judges people's eye fixation front-facing camera, whether be greater than n*T(n > 1).
S05: if so, control post-positioned pick-up head and switch to front-facing camera; Otherwise, still keep the preview mode of post-positioned pick-up head.Particularly, judge that the duration of people's eye fixation front-facing camera is greater than n*T(n > 1), the preview mode of controlling post-positioned pick-up head switches to the preview mode of front-facing camera; Otherwise the duration of people's eye fixation front-facing camera is less than n*T(n > 1 if judge), still keep the preview mode of post-positioned pick-up head.
Particularly, before described step S01, also comprise:
It is T1 that the cycle that front-facing camera gathers facial image is set, and the duration that detects position of human eye is set is T2, and T2≤T1; The duration that people's eye fixation front-facing camera is set is simultaneously T3, therefore has T3=n*T(n > 1).
As shown in Figure 2, Fig. 2 is the sub-process figure of step S03 in the changing method of mobile terminal front camera and rear camera of the present invention, and it specifically comprises the steps:
S31: obtain the facial image that front-facing camera gathers.
S32: described facial image is divided into a two-dimensional coordinate; The abscissa of this two-dimensional coordinate is X, and ordinate is Y, and coordinate range can comprehensively be determined according to the resolution of camera and mobile phone B B data processing performance, and the title of described reference axis can customize.
S33: described facial image is strengthened to contrast; Due to the gray value of people's eyeball, the white of the eye and skin, each is different, therefore, the facial image detecting is strengthened after contrast, and the difference of the gray value of eyeball, the white of the eye and skin can be larger.And, preferably, the gray value of eyeball, the white of the eye and skin can be set, for example the gray value of eyeball, the white of the eye and skin is set to respectively to G1, G2 and G3, therefore, there is G1 > G3 > G2.
S34: set up the circular shuttering that Radius is R; Described radius R is the assembly average of the radius of human eye eyeball.
S35: start from left to right, from up to down scan from strengthening the origin of coordinates of the described facial image contrast, and scanning stepping is 2R.
S36: judgement take scanning element in the border circular areas that the center of circle, R are radius gray value a little whether be greater than the gray value of eyeball, and judge outside described border circular areas gray value a little whether be less than the gray value of eyeball; Particularly, for each point scanning, if take this point in the border circular areas that the center of circle, R are radius gray value a little be all greater than G1, and beyond this border circular areas, radius increase after △ R in formed △ region gray value a little be all less than G1, can judge that described border circular areas overlaps with the eyeball of human eye.
S37: if so, judge that described border circular areas overlaps with the eyeball of human eye, and the central coordinate of circle that records described border circular areas is eyeball center; Otherwise, carry out step (35).The border circular areas that to judge with scanning element be radius as the center of circle, R overlaps with the eyeball of human eye, and the central coordinate of circle of this border circular areas is the position at eyeball center, and records this coordinate (X1, Y1); Otherwise, continue scan and judge until scanned whole facial image.
Complete after above-mentioned detecting step, enter next sense cycle, next front-facing camera being collected facial image detects, and by the eyeball position record detecting, so repeat, to utilize the eyeball position detecting to judge whether human eye is watching front-facing camera attentively.
In addition, before the step S01 of changing method that carries out mobile terminal front camera and rear camera of the present invention, also comprise the model test by human eyeball, the corresponding relation in the facial image of confirming to scan between the displacement of human eye and actual physics distance.
Particularly, first suppose that people stares at the centre of mobile phone screen, now, in corresponding human face scanning image, the position coordinates of human eye is (Xm, Ym); Suppose that eyeball is from seeing screen right hand edge position in the middle of screen, now from the facial image of scanning, can obtain the distance that eyeball moves right is imageR, same method can obtain, when eyeball is seen screen top edge, lower limb, left hand edge from screen is middle, in the facial image of scanning, the displacement of eyeball is respectively imageU, imageD, imageL.
In addition, according to the concrete apparent size of mobile phone, Ke get mobile phone screen center is respectively LU, LD, LL, LR to the physical distance at edge, screen upper and lower, left and right.
According to the data that obtain above, can show that the displacement of people's eyeball in scanned facial image and the proportionate relationship before actual physics distance are:
AU=imageU/LU；
AD=imageD/LD；
AL=imageL/LL；
AR=imageR/LR；
Due to LU=LD, LL=LR, so AU=AD, AL=AR.
On the basis of aforementioned proportion relation, then carry out the step S04 that the present invention moves the changing method of terminal front camera and rear camera.
Consult Fig. 3 below, to judging that the process whether human eye eyeball stares at front-facing camera is described.In actual use, people's eyeball can always not stare at the centre of mobile phone screen, may stare at any place of mobile phone screen, if people's eyeball stares at certain point on mobile phone screen, the position that in the facial image collecting, people's eyeball is corresponding is (Xr, Yr), this point and the coordinate (Xm when shielding center to eyeball, Ym) relative coordinate is (Xm-Xr, Ym-Yr); In addition, utilize aforementioned proportion relation to learn, Cong Ping sees at center that screen approaches the distance that the eyeball of the marginal position point A of front-facing camera moves and is respectively Sx3*AL, Sy3*AU(wherein, Sx1, Sy1 are that mobile phone screen approaches the marginal position point A of front-facing camera to lateral separation and the fore-and-aft distance of the O of screen center, Sx3, Sy3 be front-facing camera near the location point B of mobile phone outer rim to screen center lateral separation and fore-and-aft distance, particular location is as shown in Figure 3); Add eyeball and now stare at point on screen corresponding to the distance X m-Xr of screen center, Ym-Yr, can obtain the term of reference of eyeball displacement (being Xr-X1, Yr-Y1), is also following relational expression:
Xm-Xr+Sx3*AL>Xr-X1>Xm-Xr+Sx1*AL；
Ym-Yr+Sy3*AU>Yr-Y1>Ym-Yr+Sy1*AU；
When meeting above-mentioned relation formula, can judge that people stares at front-facing camera.When human eye keeps the time of this state, be greater than n*T1(n>1), when the lasting duration that namely people stares at front-facing camera is greater than n*T1, the preview state of controlling post-positioned pick-up head switches to the preview state of front-facing camera; When people's eye gaze being detected and the time of front-facing camera, be less than n*T1, also watching the time of front-facing camera attentively when T3 is following, mobile phone still keeps the preview mode of post-positioned pick-up head.
Changing method due to mobile terminal front camera and rear camera of the present invention, by front-facing camera, gather facial image, detect the direction of gaze of human eye to judge whether human eye watches front-facing camera attentively, the duration that judges again people's eye fixation front-facing camera reaches after certain time length, control post-positioned pick-up head and switch to front-facing camera, make post-positioned pick-up head more convenient, quick to the switching of front-facing camera, easy to operate, thereby improve user, experience.
As shown in Figure 4, the mobile terminal that front camera and rear camera of the present invention can automatically switch, it comprises post-positioned pick-up head 101, front-facing camera 102, control module 103, judge module 104 and detection module 105, described post-positioned pick-up head 101 is for carrying out backward taking pictures; Described front-facing camera 102 is for gathering facial image and carrying out forward direction and take pictures; Described detection module 105 is for detection of position of human eye; Described judge module 104 is for judging whether human eye watches front-facing camera attentively, and the duration that judges people's eye fixation front-facing camera be whether gather the facial image cycle n doubly, wherein, n is greater than 1; Described control module 103 is for sending the order that post-positioned pick-up head is switched to front-facing camera according to the judged result of judge module.
Preferably, the mobile terminal that described front camera and rear camera can automatically switch also comprises module 107 is set, and it gathers the cycle of facial image, detection module detects the cycle of position of human eye and the duration of judgement people eye fixation front-facing camera for front-facing camera is set.
Preferably, the mobile terminal that described front camera and rear camera can automatically switch also comprises memory module 106, and it gathers the cycle of facial image and the facial image that front-facing camera collects, the cycle of detection module detection position of human eye and the position of human eye detecting for storing front-facing camera.
The mobile terminal that can automatically switch due to front camera and rear camera of the present invention, by front-facing camera, gather facial image, detect the direction of gaze of human eye to judge whether human eye watches front-facing camera attentively, the duration that judges again people's eye fixation front-facing camera reaches after certain time length, control post-positioned pick-up head and switch to front-facing camera, make post-positioned pick-up head more convenient, quick to the switching of front-facing camera, easy to operate, thereby improve user, experience.
Above disclosed is only the preferred embodiments of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the present patent application the scope of the claims, still belongs to the scope that the present invention is contained.
Claims (6)
1. a changing method for mobile terminal front camera and rear camera, is characterized in that, comprises the steps:
(1) open front-facing camera and the post-positioned pick-up head of mobile terminal;
(2) front-facing camera gathers facial image;
(3) duplicate detection record the position of human eye in each facial image;
(4) according to the position of human eye of record, judge whether human eye watches front-facing camera attentively, and whether the duration that judges people's eye fixation front-facing camera be to gather n times of facial image cycle, wherein, n is greater than 1;
(5) if so, control post-positioned pick-up head and switch to front-facing camera;
Wherein, described step (3) comprises the steps:
(31) obtain the facial image that front-facing camera gathers;
(32) described facial image is divided into a two-dimensional coordinate;
(33) described facial image is strengthened to contrast;
(34) set up the circular shuttering that Radius is R;
(35) from strengthening the origin of coordinates of the described facial image contrast, start from left to right, from up to down scan, and scanning stepping is 2R;
(36) judgement take scanning element in the border circular areas that the center of circle, R are radius gray value a little whether be greater than the gray value of eyeball, and judge outside described border circular areas gray value a little whether be less than the gray value of eyeball;
(37) if so, judge that described border circular areas overlaps with the eyeball of human eye, and the central coordinate of circle that records described border circular areas is eyeball center; Otherwise, carry out step (35);
Wherein, in described step (4) judgement people eye fixation the condition of front-facing camera as follows:
Xm-Xr+Sx3*AL>Xr-X1>Xm-Xr+Sx1*AL；
Ym-Yr+Sy3*AU>Yr-Y1>Ym-Yr+Sy1*AU；
Wherein, Sx1, Sy1 are that mobile phone screen approaches the marginal position point A of front-facing camera to lateral separation and the fore-and-aft distance of the O of screen center; Sx3, Sy3 be front-facing camera near the location point B of mobile phone outer rim to screen center lateral separation and fore-and-aft distance; Xm, Ym are people while staring at mobile phone screen middle, the position coordinates of human eye in corresponding human face scanning image; X1, Y1 is position coordinates corresponding to people's eyeball in the facial image collecting at first; Xr, Yr is people's eyeball while staring at the arbitrfary point on mobile phone screen, position coordinates corresponding to people's eyeball in the facial image collecting; AL, AU is the displacement of people's eyeball in the facial image scanning and the proportionate relationship between actual physics distance.
2. the changing method of mobile terminal front camera and rear camera as claimed in claim 1, is characterized in that, this comprises described step (1) before:
The cycle of facial image that gathers, the cycle of detection position of human eye are set.
3. the changing method of mobile terminal front camera and rear camera as claimed in claim 1, is characterized in that, described radius R is the assembly average of the radius of human eye eyeball.
4. the mobile terminal that front camera and rear camera can automatically switch, is characterized in that, comprising:
Post-positioned pick-up head, for carrying out backward taking pictures;
Front-facing camera, for gathering facial image and carrying out forward direction and take pictures;
Detection module, for detection of position of human eye;
Judge module, for judging whether human eye watches front-facing camera attentively, and the duration that judges people's eye fixation front-facing camera be whether gather the facial image cycle n doubly, wherein, n is greater than 1;
Control module, for sending the order that post-positioned pick-up head is switched to front-facing camera according to the judged result of judge module;
Wherein, when described detection module detects position of human eye, first obtain the facial image that front-facing camera gathers, and described facial image is divided into a two-dimensional coordinate; Again described facial image is strengthened to contrast; Then set up the circular shuttering that Radius is R; From strengthening the origin of coordinates of the described facial image contrast, start from left to right, from up to down scan, and scanning stepping is 2R; Judgement take scanning element in the border circular areas that the center of circle, R are radius gray value a little whether be greater than the gray value of eyeball, and judge outside described border circular areas gray value a little whether be less than the gray value of eyeball; If so, judge that described border circular areas overlaps with the eyeball of human eye, and the central coordinate of circle that records described border circular areas is eyeball center; Otherwise, again from strengthening the origin of coordinates of the described facial image contrast, start scanning;
The condition that described judge module judgement people eye fixation front-facing camera is as follows:
Xm-Xr+Sx3*AL>Xr-X1>Xm-Xr+Sx1*AL；
Ym-Yr+Sy3*AU>Yr-Y1>Ym-Yr+Sy1*AU；
Wherein, Sx1, Sy1 are that mobile phone screen approaches the marginal position point A of front-facing camera to lateral separation and the fore-and-aft distance of the O of screen center; Sx3, Sy3 be front-facing camera near the location point B of mobile phone outer rim to screen center lateral separation and fore-and-aft distance; Xm, Ym are people while staring at mobile phone screen middle, the position coordinates of human eye in corresponding human face scanning image; X1, Y1 is position coordinates corresponding to people's eyeball in the facial image collecting at first; Xr, Yr is people's eyeball while staring at the arbitrfary point on mobile phone screen, position coordinates corresponding to people's eyeball in the facial image collecting; AL, AU is the displacement of people's eyeball in the facial image scanning and the proportionate relationship between actual physics distance.
5. the mobile terminal that front camera and rear camera as claimed in claim 4 can automatically switch, is characterized in that, also comprises:
Module is set, for arranging, gathers the cycle of facial image, the cycle of detection position of human eye.
6. the mobile terminal that front camera and rear camera as claimed in claim 5 can automatically switch, is characterized in that, also comprises:
Memory module, gathers the cycle of facial image, the facial image collecting, the cycle of detecting position of human eye and the position of human eye coordinate detecting for storing front-facing camera.
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| CN201210552930.9A CN103051795B (en) | 2012-12-18 | 2012-12-18 | Method for switching front camera and rear camera of mobile terminal and mobile terminal |
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| CN103051795A (en) | 2013-04-17 |
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