CN105759971A - Method and system for automatically prompting distance from human eyes to screen - Google Patents
Method and system for automatically prompting distance from human eyes to screen Download PDFInfo
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Abstract
The invention discloses a method and a system for automatically prompting a distance from human eyes to a screen. The method comprises the following steps: (A) collecting an image of a user through a camera; (B) processing the collected image, positioning a human face through a human face detection model, positioning an eyeball pair through an eyeball pair detection model, determining an image eye distance r of the user, calculating the age of the user through an age identifying unit and outputting the user eye distance R according to the age of the user; and (C) calculating the distance (D) from the human eyes to the screen by a formula D=(R*f)/r by combining the image eye distance r, the user eye distance R and the focus distance f, comparing the D with a prompting threshold, if the D is smaller than the prompting threshold, sending out alarm to the user. The system is used for executing the method. By human face identification, eyeball pair identification and age identification, position comparison is carried out through human face identification and eyeball pair identification to increase the accuracy rate of for positioning the eyeball pair; and the prompting function is relatively suitable for adolescents through age identification to play a role in protecting the vision of the user.
Description
Technical field
The invention belongs to mode identification technology, particularly relate to a kind of automatic prompter and have hallucinations the method and system of screen distance.
Background technology
In recent years, along with rapidly popularizing of smart machine (including panel computer), the life of people is more and more convenient, but meanwhile China's myopia sickness rate substantially rises.According to the information that national health State Family Planning Commission issues for 2014, China has more than 400,000,000 myopes, and wherein teenager is myopia morbidity " severely afflicated area ", and pupil's rate of myopia is more than 25%, and junior school student's rate of myopia reaches 70%, and high school student's rate of myopia has exceeded 85%.There are some researches show, the electronic curtain closely watching smart machine for a long time is the major reason bringing out myopia, and that embodies in population of adolescent is especially prominent.So, how research effectively helps the user including teenager to keep eyes and screen distance to become a highly important problem in using panel computer process.On this basis, invention proposes a kind of sight protectio method and system that can be applicable to panel computer, helps user to keep eyes and screen distance, thus reaching the purpose of protection vision.
Existing related art scheme generally adopts relatively simple way to realize system, position as legal in morphological image Hough transformation loop truss pupil method and Perspective Principles estimate human eye and screen distance method, owing to use technology is excessively simple, algorithm is excessively outmoded, this kind of technical scheme causes that alarm accuracy rate is low, it is susceptible to fault alarm and leakage alarm, in addition existing related art scheme algorithm, threshold value all design with adult artificial object of reference, namely can not meet teen-age user demand, and teenager is precisely the high-incidence season of myopia.This scope of application that just significantly limit system and effectiveness.
Summary of the invention
The present invention is had hallucinations by a kind of automatic prompter the method for screen distance, including: A, image by camera collection user, and image is carried out pretreatment, and pretreatment includes image is carried out denoising and enhancing, to improve the discrimination power to face and eyeball pair;B, the image collected is processed, face is gone out including by Face datection model orientation, by eyeball detection model oriented eyeball to and obtain image eye distance (r) of user, calculate age of user by age recognition unit and export user's eye distance (R) according to age of user;The focal length (f) of C, combining image eye distance (r), user's eye distance (R) and photographic head, utilizing formula D=(R*f)/r calculates human eye to screen distance (D), relatively human eye to screen distance (D) and points out threshold value, if human eye to screen distance (D) less than pointing out threshold value; issue the user with alarm.
When preferably step B does not orient eyeball pair, then start to identify the local feature of the face in image, if identifying local feature and not orienting whole face, be then judged as that face distance is less than prompting threshold value.
When preferably the local feature of described face does not have identified, return step A.
Preferably detection model is the model for image recognition pre-set by the Face datection model of described step B and eyeball, and described prompting threshold value is the human eye that the sets safe distance to screen.
Preferably described step B also includes the correction of eyeball pair: the eyeball pair oriented and face are carried out location matches, by comparing eyeball, the position at face being judged, eyeball is to positioning scenarios.
Preferably by glasses recognizer, detection model is distinguished whether image has glasses by described eyeball.
Preferably the alarm of described step C includes: screen displaying character alerts or sends sound alarm.
Preferably described photographic head includes the built-in photographic head of screen and the photographic head as extra members.
A kind of automatic prompter has hallucinations the system of screen distance, including photographic head, for by the image of camera collection user, and image is carried out pretreatment, and pretreatment includes image is carried out denoising and enhancing, to improve the discrimination power to face and eyeball pair;Electronic equipment, for performing following step: the image collected is processed, face is gone out including by Face datection model orientation, by eyeball detection model oriented eyeball to and obtain image eye distance (r) of user, calculate age of user by age recognition unit and export user's eye distance (R) according to age of user;The focal length (f) of combining image eye distance (r), user's eye distance (R) and photographic head, utilizing formula D=(R*f)/r calculates human eye to screen distance (D), relatively human eye to screen distance (D) and points out threshold value, if human eye to screen distance (D) less than pointing out threshold value; issue the user with alarm.
A kind of automatic prompter has hallucinations the system of screen distance, including: image capture module, it is configured to pass the image of camera collection user, and image is carried out pretreatment, pretreatment includes image is carried out denoising and enhancing, to improve the discrimination power to face and eyeball pair;Image processing module, it is configured to the image to collecting process, face is gone out including by Face datection model orientation, by eyeball detection model oriented eyeball to and obtain image eye distance (r) of user, calculate age of user by age recognition unit and export user's eye distance (R) according to age of user;Alarm module, it is configured to the focal length (f) of combining image eye distance (r), user's eye distance (R) and photographic head, utilizing formula D=(R*f)/r calculates human eye to screen distance (D), relatively human eye to screen distance (D) and points out threshold value, if human eye to screen distance (D) less than pointing out threshold value; issue the user with alarm.
The present invention adopts recognition of face, eyeball to identifying and the age identifies, by recognition of face and eyeball to carrying out the accuracy that location comparison increases the location of eyeball pair, is identified by the age and makes the more suitable teenager of prompt facility, plays effect of protection user's vision.
Accompanying drawing explanation
Fig. 1 is that automatic prompter according to embodiments of the present invention has hallucinations the method schematic diagram of screen distance;
Fig. 2 is that automatic prompter according to embodiments of the present invention has hallucinations system 1 schematic diagram of screen distance;
Fig. 3 is that automatic prompter according to embodiments of the present invention has hallucinations system 2 schematic diagram of screen distance
Fig. 4 is that automatic prompter according to embodiments of the present invention has hallucinations screen distance schematic flow sheet;
Fig. 5 is that eyeball according to embodiments of the present invention is to correction schematic diagram.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
According to the first embodiment of the present invention, a kind of automatic prompter has hallucinations the method for screen distance, as Fig. 1 includes: A, image by camera collection user, and image is carried out pretreatment, pretreatment includes image is carried out denoising and enhancing, to improve discrimination power to face and eyeball pair, by the camera collection image to electronic equipment user;B, the image collected is processed, go out face including by Face datection model orientation;By eyeball detection model oriented eyeball to and obtain the image eye distance r of user, eyeball is to namely paired eyes, by positioning the position of eyeball pair, it is improved to by the single eyes of existing detection and first determines that pair of eyes measures eye distance again, reduce false failure rate, improve identification, improve efficiency;Calculate age of user by age recognition unit and export user eye distance R according to age of user, now with a variety of age recognition methodss, as found out, by recognition of face, several face templates that similarity is higher, contrast at different age group image, it is weighted by calculating, thus calculating the age of evaluation object, age recognition unit calculates the age of user by age recognition methods, age according to the user calculated, in conjunction with the data of different age group user's eye distance, calculates true eye distance and the user eye distance R of user;The focal distance f of C, combining image eye distance r, user eye distance R and photographic head, utilizing formula to obtain human eye to screen distance D, formula is D=(R*f)/r, compares D and prompting threshold value, if D is less than prompting threshold value, issuing the user with alarm, wherein f is the focal length extracted from photographic head hardware.
When step B does not orient eyeball pair, then start to identify the local feature of the face in image, if local feature is identified and does not orient whole face, then it is judged as face distance less than pointing out threshold value (in time occurring that face distance screen is too near, may result in the eyeball situation to all can not positioning with face, in order to this situation and user do not use screen area separately, by to simple eye, eyebrow, the local feature of the faces such as nose is identified, if a number of local feature can only be identified, and cannot recognize that whole face, then think that distance is too near, alert).
When the local feature of face does not have identified, return step A.
Detection model is the model for image recognition pre-set by the Face datection model of described step B and eyeball, and described prompting threshold value is the human eye safe distance to screen of setting.
Described step B also includes the correction of eyeball pair: eyeball pair described in step B and face carry out location matches, by comparing eyeball, the position at face being judged, eyeball is to positioning scenarios.
The alarm of described step C includes: screen displaying character alerts or send sound alarm (considering the needs of user, alarm can be independent word, independent sound or both have).
Described photographic head includes the built-in photographic head of screen and the photographic head as extra members.
A kind of automatic prompter has hallucinations the system 1 of screen distance, a kind of automatic prompter has hallucinations the system 1 of screen distance as shown in Figure 2, including: photographic head (1a), for gathering the image of user, and image is carried out pretreatment, pretreatment includes image is carried out denoising and enhancing, to improve the discrimination power to face and eyeball pair;Electronic equipment (1b), for performing following step: the image collected is processed, face is gone out including by Face datection model orientation, by eyeball detection model oriented eyeball to and obtain image eye distance (r) of user, calculate age of user by age recognition unit and export user's eye distance (R) according to age of user;The focal length (f) of combining image eye distance (r), user's eye distance (R) and photographic head, utilizing formula D=(R*f)/r calculates human eye to screen distance (D), relatively human eye to screen distance (D) and points out threshold value, if human eye to screen distance (D) less than pointing out threshold value; issue the user with alarm.
A kind of automatic prompter has hallucinations the system 2 of screen distance, a kind of automatic prompter has hallucinations the system 2 of screen distance as shown in Figure 3, including: external image capture module (2a), it is configured to pass the image of camera collection user, and image is carried out pretreatment, pretreatment includes image is carried out denoising and enhancing, to improve the discrimination power to face and eyeball pair;Image processing module (2b), is configured to the image to collecting and processes, go out face including by Face datection model orientation;By eyeball detection model oriented eyeball to and obtain the image eye distance r of user;Calculate age of user by age recognition unit and export user eye distance R according to age of user;Alarm module (2c), it is configured to the focal distance f of combining image eye distance r, user eye distance R and photographic head, formula is utilized to obtain human eye to screen distance D, formula is D=(R*f)/r, relatively D and prompting threshold value, if D is less than prompting threshold value, issuing the user with alarm, wherein f is the focal length extracted from photographic head hardware.
Consider that part electronic equipment hardware performance is limited in other embodiments, system can be saved eyeball and positioning correcting, age are identified and closely 3 modules of pattern, improve arithmetic speed, as the suitability at different performance equipment of " low the join version " ensuring method.
According to the second embodiment of the present invention, flow chart as shown in Figure 4:
Step S1 initializes system, starts front-facing camera, reads photographic head focal distance f from hardware simultaneously;
Step S2 reads a current two field picture (unsuccessful reading then process ends) by panel computer front-facing camera, and carries out suitable image noise reduction and enhancement pretreatment;
Step S3 passes through eyeball set in advance to the position of the eyeball pair of human eye in detection model network for location picture.If finding, then enter step S4;If not finding, then it is assumed that active user does not use panel computer, entering step S2 and re-reading next frame;
It is to be appreciated that " model " of indication herein is all obtained by pattern recognition training, it is possible to be accurately positioned the target in image.Detection model is included human eye eyeball in the 2 kinds of situations do not worn glasses and wear glasses to detection model by the eyeball in step S3, is able in the image of detection different situations eyeball to position.
Step S4 is first with the face in Face datection model orientation image, and result is surveyed in position relative relation verification location by recycling face and eyeball, and debug detects, obtain accurately eyeball to position;Then pass through the interpupillary distance r that position is calculated in image by eyeball;Identify the face age afterwards, and according to the true interpupillary distance R of estimation of Age.
In practice, by existing result of study: the interpupillary distance of the people of same age is generally all sufficiently close to meansigma methods, and error is less than 10%.But teenager is owing to not yet growing completely, and interpupillary distance is significantly less than adult;When entering adult, interpupillary distance no longer changes.So the present invention proposes to utilize the age to identify estimates the actual interpupillary distance of user, to improve calculating exactness.
Step S5 has been obtained for necessary data, including the actual interpupillary distance estimated value R of the interpupillary distance r in photographic head focal distance f, image and user, then formula can be utilized to calculate human eye to screen distance D, and formula is as follows:
Step S6 compares human eye to screen distance and predetermined threshold value, if less than threshold value, then issues the user with alarm (as captions are pointed out);Otherwise, do not alert and enter S2.Wherein threshold value presets, but accepts user and arrange from Row sum-equal matrix.
Step S31 is pattern closely.As eyes of user and screen distance excessively near (less than 10cm), photographic head often cannot obtain user's full facial image, and this pattern is by image processing techniques analyzes in image whether there is the bigger face local feature of several areas (including single eyes, nose and left and right eyebrow etc.).If there is a number of (such as more than 2) bigger local feature, directly alert;If closely pattern is also without alarm, then it is assumed that active user does not use flat board.Return step S2 afterwards to continue.
According to the third embodiment of the invention, as it is shown in figure 5, testing result is corrected by eyeball:
One concrete testing result, its center K1 represents the human face region detected, frame K2 represents the human eye eyeball detected to region, and frame K3 represents most probable in reality and is mistakenly detected as the region of eyeball pair.Obviously can utilizing the relative position relation debug detection region of face and eyeball pair, namely square frame K2 should be positioned at the first half of face square frame K1 by eyeball.Considering that each detector has the accuracy of 90%, i.e. the error rate of 0.1, after being corrected by the method, namely lower error rate is 0.1*0.1=0.01, fullys meet instructions for use, and its center K1 is face, and frame K2 is eyeball pair, and frame K3 is error detection.
The above, simply presently preferred embodiments of the present invention, the invention is not limited in above-mentioned embodiment, as long as it reaches the technique effect of the present invention with identical means, all should belong to protection scope of the present invention.In protection scope of the present invention, its technical scheme and/or embodiment can have various different modifications and variations.
Claims (10)
1. automatic prompter has hallucinations a method for screen distance, including:
A, image by camera collection user, and image is carried out pretreatment, pretreatment includes image is carried out denoising and enhancing, to improve the discrimination power to face and eyeball pair;
B, the image collected is processed, face is gone out including by Face datection model orientation, by eyeball detection model oriented eyeball to and obtain image eye distance (r) of user, calculate age of user by age recognition unit and export user's eye distance (R) according to age of user;
The focal length (f) of C, combining image eye distance (r), user's eye distance (R) and photographic head, utilizing formula D=(R*f)/r calculates human eye to screen distance (D), relatively human eye to screen distance (D) and points out threshold value, if human eye to screen distance (D) less than pointing out threshold value; issue the user with alarm.
2. a kind of automatic prompter according to claim 1 has hallucinations the method for screen distance, it is characterised in that described step B also includes:
When not orienting eyeball pair, then start to identify the local feature of the face in image;
If identifying local feature and not orienting whole face, then it is judged as that face distance is less than prompting threshold value.
3. a kind of automatic prompter according to claim 2 has hallucinations the method for screen distance, it is characterised in that when the local feature of described face does not have identified, returns step A.
4. a kind of automatic prompter according to claim 1 has hallucinations the method for screen distance, it is characterized in that, detection model is the model for image recognition pre-set by the Face datection model of described step B and eyeball, and described prompting threshold value is the human eye safe distance to screen of setting.
5. a kind of automatic prompter according to claim 1 has hallucinations the method for screen distance, it is characterised in that described step B also includes the correction of eyeball pair:
The eyeball pair oriented and face are carried out location matches, by comparing eyeball, the position at face is judged that eyeball is to positioning scenarios.
6. a kind of automatic prompter according to claim 1 has hallucinations the method for screen distance, it is characterised in that by glasses recognizer, detection model is distinguished whether image has glasses by described eyeball.
7. a kind of automatic prompter according to claim 1 has hallucinations the method for screen distance, it is characterised in that described alarm includes: screen displaying character alarm or send sound alarm.
8. a kind of automatic prompter according to claim 1 has hallucinations the method for screen distance, it is characterised in that described photographic head includes the built-in photographic head of screen and the photographic head as extra members.
9. automatic prompter has hallucinations a system for screen distance, including:
Photographic head, by the image of camera collection user, and carries out pretreatment to image, and pretreatment includes image is carried out denoising and enhancing, to improve the discrimination power to face and eyeball pair;
Electronic equipment, is used for performing operations described below:
The image collected is processed, face is gone out including by Face datection model orientation, by eyeball detection model oriented eyeball to and obtain image eye distance (r) of user, calculate age of user by age recognition unit and export user's eye distance (R) according to age of user;
The focal length (f) of combining image eye distance (r), user's eye distance (R) and photographic head, utilizing formula D=(R*f)/r calculates human eye to screen distance (D), relatively human eye to screen distance (D) and points out threshold value, if human eye to screen distance (D) less than pointing out threshold value; issue the user with alarm.
10. automatic prompter has hallucinations a system for screen distance, including:
Image capture module, is configured to pass the image of camera collection user, and image is carried out pretreatment, and pretreatment includes image is carried out denoising and enhancing, to improve the discrimination power to face and eyeball pair;
Image processing module, it is configured to the image to collecting process, face is gone out including by Face datection model orientation, by eyeball detection model oriented eyeball to and obtain image eye distance (r) of user, calculate age of user by age recognition unit and export user's eye distance (R) according to age of user;
Alarm module, it is configured to the focal length (f) of combining image eye distance (r), user's eye distance (R) and photographic head, utilizing formula D=(R*f)/r calculates human eye to screen distance (D), relatively human eye to screen distance (D) and points out threshold value, if human eye to screen distance (D) less than pointing out threshold value; issue the user with alarm.
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