CN109726694A - A kind of iris image acquiring method and device - Google Patents
A kind of iris image acquiring method and device Download PDFInfo
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- CN109726694A CN109726694A CN201910002609.5A CN201910002609A CN109726694A CN 109726694 A CN109726694 A CN 109726694A CN 201910002609 A CN201910002609 A CN 201910002609A CN 109726694 A CN109726694 A CN 109726694A
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Abstract
The invention discloses a kind of iris image acquiring method and device, iris image acquiring method includes the following steps: S1, starting second camera, and real-time display live view；S2, after surveying and drawing live view and face occur, prompt the mobile face of user to suitable position；After S3, face location enter iris recognition region, starts the first camera and infrared light compensating lamp obtains iris image；S4, iris image is pre-processed, and exports judging identity result after extracting iris feature, being matched with the iris data in database.Its iris identification device, comprising: processor；First camera, for obtaining iris image；Second camera, for obtaining facial image；Infrared light compensating lamp；Display screen；Flash memory；Communication interface module, for being connect with external device communication；First camera, second camera, infrared light compensating lamp, display screen, memory, flash memory, communication interface module signal end are communicated to connect with processor signal end respectively.
Description
Technical field
The present invention relates to computer vision fields, more particularly to a kind of iris image acquiring method and device.
Background technique
Since the appearance of iris recognition technology and making rapid progress with science and technology, iris recognition technology starts to come into people's
Daily life: iris recognition technology be applied to mine building site, prison/anti-terrorism/public security/customs/detention house, finance/bank/
The tax, child's loss etc. field, manage for pedestrian passage, and enterprises and institutions' management or identification management provide just
Benefit, this, which has benefited from iris recognition technology, has the characteristics that anti-imitative property, stability, uniqueness, untouchable, this becomes one
Very important, high especially suitable for confidentiality requirement environment perception technology.Iris recognition technology is many at home and abroad
Field is just playing increasing effect, such as clearance management is carried out in the identity automatic checkout system in airport and harbour, in weight
Point prevention region, channel, port apply to the personnel of certification authorize different permissions and to forcibly try to by it is unauthenticated
Personnel taken measures to be enclosed in guard space automatically by system.Since iris is a part positioned at human eye, need
Closer distance can collect better quality clearly iris image, and need just more preferably to adopt using the irradiation of infrared light
Collect the higher iris image of quality, so when people need to carry out iris recognition, it all can be on iris identification device simultaneously
The image for meeting iris recognition requirement can be obtained by being appeared according to eyes in specified region, the iris being usually displayed on screen film
Image is black and white, and very bright in the place of the irradiation central area of LED, and the place of fringe region is very dark, at this time
Human eye leans on very close, and this light stimulation from screen is easy to the dislike or resistance of people；The ring especially around
In the case that border is very pitch-dark, frightful feeling is also had, to occur contradicting psychology, this hostile user's experience is affected
The extensive use of iris recognition technology.
Summary of the invention
In view of the above drawbacks of the prior art, technical problem to be solved by the invention is to provide a kind of iris capturing sides
Method and device, can solve do not need to appear in again from the iris image for the overall process for collecting identification during iris recognition it is aobvious
In display screen, by using more natural warmer interactive interface is arrived, keeps the mood of user more pleasant, promote user's use and experience
Friendly, to be more advantageous to the popularization and extensive use of iris recognition technology.
To achieve the above object, the present invention provides being to integrate two cameras on iris identification device first, this two
A camera needs to carry out before assembling facial image and iris image calibration, and the first of iris identification device is taken the photograph after calibration is good
Then iris image acquiring as head for black and white, second camera are known for colored live image acquisition using iris
It shows always when other device, on display screen from the collected real-time pictures of face camera, when detecting that face appears in picture
Just starting iris camera carries out iris image acquiring and carries out iris recognition output judging result when central, but from start to finish
It allows user to be not felt by the presence of iris recognition process, but sees the colored face picture of user oneself, to realize
Good experience.
An expectation in EXEMPLARY CONCEPT of the present invention, provides a kind of iris image acquiring method, and technical solution includes as follows
Step:
(1) the first camera is placed into the designated position of calibration system by the calibration of iris image, and starting calibration system is simultaneously
Light the first camera；The fine image of eye for demarcating version at this time is fixed on the position of a low coverage, and the first camera will acquire
Eye image onto calibration version, and find the size that eye contour calculates eyes behind position according to geometrical relationship on the image
With the relationship of the optical axis and field angle of distance and the first camera, thus establish low coverage at the fine three-dimensional system of coordinate parameter of eye；
The fine image of eye of mobile calibration version in one away from position on, the first camera will collect the eye in calibration version
Eyeball image, and find that eye contour calculates the size of eyes according to geometrical relationship behind position on the image and distance and first are taken the photograph
As the optical axis of head and the relationship of field angle, thus the fine three-dimensional system of coordinate parameter of eye away from place in establishing；
On the eye fine image to the position of a long distance of mobile calibration version, the first camera will collect the eye in calibration version
Eyeball image, and find that eye contour calculates the size of eyes according to geometrical relationship behind position on the image and distance and first are taken the photograph
As the optical axis of head and the relationship of field angle, to establish the fine three-dimensional system of coordinate parameter of eye at long distance；
It is associated finally by the iris recognition effective coverage parameter of this three groups of parameters and standard and compensation ginseng is calculated
Number, this final compensating parameter are written in this camera system.
(2) second camera is placed into the designated position of calibration system by the calibration of facial image, and starting calibration system is simultaneously
Light second camera；The facial image for demarcating version at this time is fixed on the position of a low coverage, and second camera will acquire
Facial image onto calibration version, and find the size that facial contour calculates face behind position according to geometrical relationship on the image
With the relationship of the optical axis and field angle of distance and second camera, thus establish low coverage at face three-dimensional system of coordinate parameter；
The fine image of eye of mobile calibration version in one away from position on, second camera will collect the people in calibration version
Face image, and find that facial contour calculates the size of face according to geometrical relationship behind position on the image and distance and second are taken the photograph
As the optical axis of head and the relationship of field angle, thus the face three-dimensional system of coordinate parameter away from place in establishing；
On the facial image to the position of a long distance of mobile calibration version, second camera will collect the people in calibration version
Face image, and find that facial contour calculates the size of face according to geometrical relationship behind position on the image and distance and second are taken the photograph
As the optical axis of head and the relationship of field angle, to establish the face three-dimensional system of coordinate parameter at long distance；Finally by this three groups of ginsengs
Several and standard recognition of face effective coverage parameter, which is associated, is calculated compensating parameter, this is written in this final compensating parameter
In a camera system.
(3) the first camera and second camera are placed into the specified of calibration system by the calibration of face and iris simultaneously
Position starts calibration system and lights the first camera and second camera；Obtain the facial image in calibration version simultaneously at this time
And iris image, the optical axis of the first camera and the optical axis of second camera are calculated, then by calculating the people in calibration version
After geometrical relationship between face position and iris image position and the first camera position and second camera position, by first
The fixed position relative parameter of camera and second camera is written in this camera system.
(4) the first camera and second camera after calibration is good are mounted on iris identification device, iris recognition dress
Set after powered up enter iris authentication system, at this time by second camera acquire video be arranged and occur on a display screen, when
After detecting that face picture occurs in display screen, the Face datection unit of the processor of iris identification device calculates the position of face
It sets and is matched from from the location parameter reading in phase system；
If detecting, face location is in non-iris recognition regional scope, can prompt user mobile by voice
Face location to suitable position, can by include but is not limited on display screen text or figure or color picture
It prompts the mobile face location of user to suitable position, user can also be prompted to move with display screen picture by voice simultaneously
Mobile face location is moved to suitable position.
When facial image appears in the top of the display screen, it can be reminded and be used by the display screen or loudspeaker
Family needs to squat lower, moves down to user's face in the allowed band of iris recognition；
When facial image appears in the lower section of the display screen, it can be reminded and be used by the display screen or loudspeaker
Family needs to stand higher, makes user's face into the allowed band for moving to iris recognition；
When facial image appear in the display screen it is bigger than normal when, the display screen can be passed through or loudspeaker are reminded and used
Family needs to stand far, moves to user's face backward in the allowed band of iris recognition；
When facial image appear in the display screen it is less than normal when, the display screen can be passed through or loudspeaker are reminded and used
Family needs to stand closer, makes user's face into the allowed band for moving forward to iris recognition.
Once detecting that face location enters iris recognition region, then iris identification device stops prompt face location at once
The instruction that no longer needs to adjust and the instruction for issuing starting iris recognition, while starting the first camera and infrared light compensating lamp and obtaining
Take iris image；
Processor carries out iris preprocessing after receiving iris image, and the iris preprocessing is included in rainbow
Iris position and outer edge are positioned in film image, are detected the part blocked in iris region by eyelid, eyelashes and high bright spot, are returned
One, which changes iris image and iris image enhancing, the source of particular technique content, can retrieve paper in Baidu library and " use
Iris identification method research under the less mated condition in family " it obtains, after having carried out this process of iris preprocessing, then
Iris feature and coding are extracted, then is compared with pre-stored iris feature library information, judging identity result is finally exported；
The display screen picture is from start to finish not in iris image during iris recognition.
(5) iris identification device will export judging identity as a result, can by communication interface module, including but not limited to after
Electrical apparatus interface, Wiegand interface, Ethernet interface etc. carry out communication data transmission with external equipment, to realize the switch control of gate inhibition
System.
The beneficial effects of the present invention are: the overall process of iris recognition may be implemented described in iris identification device of the invention
Display screen on only there is the color image of user, rather than traditional black white image avoids black and white screen from giving user's bring
Some disagreeableness experience such as resistance, dislike, threatening；Since the display screen occurs that always colored, face picture
Face more meets the expectation as far as possible that people use and allows user to seem in actual use to enhance the experience of iris recognition
The recognition of face that uses rather than iris recognition, are more advantageous to marketing；Importantly, iris recognition is more safer,
The cost performance for the iris identification device of user used is higher, and it is also very convenient for so that people is known more about iris recognition technology originally
Identity identifying method.
Detailed description of the invention
Fig. 1 is eyes demarcation flow schematic diagram.
Fig. 2 is face calibration flow diagram.
Fig. 3 is face and eyes demarcation flow schematic diagram.
Fig. 4 is iris capturing and identification process schematic diagram.
Fig. 5 is the flow diagram of method for collecting iris provided in an embodiment of the present invention.
Fig. 6 is the module diagram of iris identification device provided in an embodiment of the present invention.
Fig. 7 is the use flow diagram of iris identification device provided in an embodiment of the present invention
Fig. 8 is the Optical System Design signal between the face and iris of iris identification device provided in an embodiment of the present invention
Figure and implementation using renderings.
Fig. 9 is face display effect schematic diagram when iris identification device provided in an embodiment of the present invention uses.
Iris display effect schematic diagram when Figure 10 is iris identification device provided in an embodiment of the present invention non-use.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples:
Referring to figures 1-4, specific technical solution includes the following steps:
1. the calibration of iris image
1.1 starting calibration systems, and the first camera (the first camera of starting) is lighted, the first camera is placed into mark
Determine the designated position of system, start calibration system and lights the first camera；
1.2 are fixed on the fine image of the eye for demarcating version on the position of one low coverage, in the first camera acquisition calibration version
Eye image, and find size and distance and first that eye contour calculates eyes behind position according to geometrical relationship on the image
The optical axis of camera and the relationship of field angle, to establish the fine three-dimensional system of coordinate parameter of eye at low coverage；
The fine images of eye of 1.3 mobile calibration versions in one away from position on, the first camera acquire again to be demarcated in version
Eye image, and find size and distance and that eye contour calculates eyes behind position according to geometrical relationship on the image
The optical axis of one camera and the relationship of field angle, thus the fine three-dimensional system of coordinate parameter of eye away from place in establishing；
On the eye fine image to the position of a long distance of 1.4 mobile calibration versions, the first camera continues in acquisition calibration version
Eye image, and find size and distance and that eye contour calculates eyes behind position according to geometrical relationship on the image
The optical axis of one camera and the relationship of field angle, to establish the fine three-dimensional system of coordinate parameter of eye at long distance；
1.5 finally, be associated calculating by the iris recognition effective coverage parameter of this three groups of parameters of 1.1-1.3 and standard
Obtain compensating parameter, this final compensating parameter is written in this camera system.
Specifically:
The calculation formula of the calibrating parameters of pupil:
According to magnifying power formula:
Wherein k is magnifying power, and H is that object is high, and h is image height.
According to image-forming principle formula:
Wherein u is object distance, and v is image distance, and f is the focal length of camera.
For the same camera, f, k are fixed；For the same pupil, H is fixed；Therefore object distance u and image height h is deposited
In certain relationship:
u∝h
As the image height h for the pupil that we obtain an image from camera, then we it is known that its pupil with
The distance between camera (i.e. object distance u)；
While the image height h for the pupil that we obtain an image from camera, we can also obtain the pupil center
Position institute in the picture relative to arbitrarily being selected in image a bit (usually using camera starting pixels point or central point) as origin,
So it is achieved with the space coordinate (x, y, z) of the pupil center location, in which:
Z=h*s, wherein s is calibration coefficient.Calibration coefficient we be stored in advance in camera system by calibration system.
I.e. in calibration system, pupil calibration version is placed some fixed range d1 (at a distance from 1.1) with camera first by us,
We can obtain image height h1 (distance 1.2 in) of the pupil under the distance, and similarly we can obtain pupil calibration version
Place image height h2 corresponding with some fixed range d2 of camera, in order to more more accurate calibration system, we usually and also
It can be further added by one group of parameter, i.e., pupil calibration version is placed into some fixed range d3 (at a distance from 1.3) with camera and obtained
Corresponding image height d3 is taken, therefore we are assured that the calibration coefficient of the camera:
S ∝ [h1/d1, h2/d2, h3/d3]
Similarly, we can obtain the calibrating parameters of facial contour.
2. the calibration of facial image
Second camera is placed into the designated position of calibration system by 2.1 starting second cameras, and starting calibration system is simultaneously
Second camera is lighted, second camera detects face；
The facial image of 2.2 calibration versions is fixed on the position of a low coverage, and second camera will collect calibration version
On facial image, and find facial contour on the image behind position according to geometrical relationship calculate face size and distance and
The optical axis of second camera and the relationship of field angle, to establish the face three-dimensional system of coordinate parameter at low coverage；
The fine images of eye of 2.3 mobile calibration versions in one away from position on, second camera will collect in calibration version
Facial image, and find size and distance and that facial contour calculates face behind position according to geometrical relationship on the image
The optical axis of two cameras and the relationship of field angle, thus the face three-dimensional system of coordinate parameter away from place in establishing；
On the facial image to the position of a long distance of 2.4 mobile calibration versions, second camera will be collected in calibration version
Facial image, and find size and distance and that facial contour calculates face behind position according to geometrical relationship on the image
The optical axis of two cameras and the relationship of field angle, to establish the face three-dimensional system of coordinate parameter at long distance；Finally by this three
The recognition of face effective coverage parameter of group parameter and standard, which is associated, is calculated compensating parameter, this final compensating parameter is write
Enter in this camera system.
3. the first camera and second camera are placed into the specific bit of calibration system by the calibration of face and iris simultaneously
It sets, start calibration system and lights the first camera and second camera；
3.1 first cameras and second camera obtain the facial image and iris image in calibration version simultaneously, calculate
The optical axis of first camera and the optical axis of second camera, then by calculating face location and iris image position in calibration version
Set that the geometrical relationship between the first camera position and second camera position is to be fixed up later, it is specific as follows: same
There are facial contour and pupil profile simultaneously in one calibration version, according to the human eye of standard and the parameter of human face ratio geometry, such as it
Position plane Relation Parameters between two (namely with one of them or selected a little establish coordinate to confirm for coordinate origin
It is determined), two o'clock relative position is calculated by plane coordinates can calculate as a result, then comparing the ginseng of calibration version
Whether number and the result actually calculated are in the error range of permission, and meeting then is qualified product, so the two mould groups are just
Relative position can be fixed up, this finally is written in the fixed position relative parameter of the first camera and second camera
In camera system；
4. the first camera after demarcating well and second camera are installed on iris identification device, iris identification device
It is communicated after powered up with iris authentication system, the video that second camera acquires is shown on a display screen, is shown when detecting
After face picture occurs in screen, the Face datection unit built in the processor of iris identification device calculates the position of face, and
Fixed position relative parameter is read out of camera system according to this position, is then matched；
Matched parameter is exactly the basic parameter of three-dimensional system of coordinate that front demarcate and passes through and demarcate the calculated mistake of version
Poor range parameter is as reference parameter, after calculating the numerical value of three-dimensional coordinate of face in real time, to real-time numerical value and reference
Parameter compare, the range beyond permission just needs to adjust the position of face, until face appears in the picture of permission
In face.
If 4.1 detect that face location is in non-iris recognition regional scope, user can be prompted by voice
Mobile face location, can be by including but is not limited to text or figure or color on display screen to suitable position
Picture prompts the mobile face location of user to suitable position, can also prompt to use with display screen picture by voice simultaneously
Mobile face location is moved to suitable position in family.
4.2, when facial image appears in the top of the display screen, can be mentioned by the display screen or loudspeaker
Awake user needs to squat lower, moves down to user's face in the allowed band of iris recognition；
4.3, when facial image appears in the lower section of the display screen, can be mentioned by the display screen or loudspeaker
Awake user needs to stand higher, makes user's face into the allowed band for moving to iris recognition；
4.4 when facial image appear in the display screen it is bigger than normal when, can be mentioned by the display screen or loudspeaker
The user that wakes up needs to stand far, moves to user's face backward in the allowed band of iris recognition；
4.5 when facial image appear in the display screen it is less than normal when, can be mentioned by the display screen or loudspeaker
Awake user needs to stand closer, makes user's face into the allowed band for moving forward to iris recognition.
4.6 once detect that face location enters iris recognition region, then iris identification device stops prompt face at once
Instruction that position no longer needs to adjust and the instruction for issuing starting iris recognition, while starting the first camera and infrared light compensating lamp
And obtain iris image；
Processor carries out iris preprocessing after receiving iris image, and the iris preprocessing is included in rainbow
Iris position and outer edge are positioned in film image, are detected the part blocked in iris region by eyelid, eyelashes and high bright spot, are returned
One, which changes iris image and iris image enhancing, the source of particular technique content, can retrieve paper in Baidu library and " use
Iris identification method research under the less mated condition in family " it obtains, after having carried out this process of iris preprocessing, then
Iris feature and coding are extracted, then is compared with pre-stored iris feature library information, judging identity result is finally exported；
The display screen picture is from start to finish not in iris image during iris recognition.
5. iris identification device will export judging identity as a result, can by communication interface module, including but not limited to after
Electrical apparatus interface, Wiegand interface, Ethernet interface etc. carry out communication data transmission with external equipment.This design, which can be applied, to be prohibited
Switch control on.
Referring to Fig. 5, a kind of iris image acquiring method includes the following steps:
S1, starting second camera, and real-time display live view；
S2, after surveying and drawing live view and face occur, prompt the mobile face of user to suitable position；
After S3, face location enter iris recognition region, starts the first camera and infrared light compensating lamp obtains iris image；
S4, iris image is pre-processed, and after extracting iris feature, being matched with the iris data in database
Export judging identity result.
Referring to Fig. 6, a kind of iris identification device, comprising:
Processor 17, for receiving and dispatching, parsing control signal, while according to pre-set programs calculating parameter；
First camera 11, for obtaining iris image；
Second camera 12, for obtaining facial image；
Infrared light compensating lamp 13, for carrying out light filling when the first camera 11 acquires iris image；
Display screen 14, the image acquired for showing second camera 12；
Memory 15, for the data that storage processor is to be processed or is handling；
Flash memory 16, for storing data；
Communication interface module 18, for being connect with external device communication, comprising: relay 18b, ether web frame 18a, Wei
Root interface 18c.
First camera, second camera, infrared light compensating lamp, display screen, memory, flash memory, communication interface module signal end
It is communicated to connect respectively with processor signal end.
Referring to Fig. 7, iris identification device is in use, second camera acquires video, and realtime video transmission is extremely handled
Real-time pictures processing unit 17a built in device 17 is handled, and then shows video on display screen 14；It can specifically refer to
Existing self-service certificate photo camera.
Face is detected when real-time pictures processing unit 17a is handled or according to plug-in, mainly by built-in
Face datection unit 17b detected；
The face that Face datection unit 17b will test is compared with the human face data in face database 16a, finds out face
Pre-stored information, face database 16a are stored in flash memory 16；
For Face datection unit 17b after being matched to face in face database, calling changes the corresponding iris information of face, opens simultaneously
Dynamic first camera 11 acquires iris image, iris image is then transmitted to iris recognition unit 17C, iris recognition unit is
The program being built in processor 17, the iris information on iris image acquired for identification, and be stored in flash memory 16
Interior iris feature library 16b is delivered to the judging unit 17d being built in processor 17 jointly and is compared；It will can lead to before
Cross the iris information transferred after recognition of face preferentially to be compared, pass through if compared, export identification information, it is on the contrary then
Export identity validation failure information.
Referring to Fig. 8, installing frame 1 is shown on display screen 14, face 2 is shown on installing frame 1, in the second row of Fig. 8 by doing to the right side
View successively indicate: excessively high facial image 2a, too low facial image 2b, cross person of modern times's face image 2c, too far facial image 2d；
When excessively high facial image 2a, installing frame show need to squat it is lower；Too low facial image 2b, installing frame display need
It stands higher；Person of modern times face image 2c is crossed, installing frame display needs to stand remote；Facial image 2d too far, installing frame display need
It stands closer；
Referring to Fig. 9, the schematic diagram of facial image 21 to be identified is acquired for iris identification device, wherein display screen 14 is fixed
On installing frame 1, and the first camera 11, second camera 12, infrared light compensating lamp 13 are mounted on installing frame 1, and are located at aobvious
14 top of display screen.
Referring to Figure 10, the schematic diagram of iris image 22, in actual use, iris image 22 are acquired for iris identification device
It does not appear on display screen.
Place is not described in detail by the present invention, is the well-known technique of those skilled in the art.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of iris image acquiring method, which comprises the steps of:
S1, starting second camera, and real-time display live view；
S2, after surveying and drawing live view and face occur, prompt the mobile face of user to suitable position；
After S3, face location enter iris recognition region, starts the first camera and infrared light compensating lamp obtains iris image；
S4, iris image is pre-processed, and extract iris feature, matched with the iris data in database after export
Judging identity result.
2. iris image acquiring method as described in claim 1, which is characterized in that further include following steps before S1:
1. the calibration of iris image；
2. the calibration of facial image；
3. the calibration of face and iris；
4. the first camera after demarcating well and second camera are installed on iris identification device, iris identification device is logical
It is communicated after electricity with iris authentication system；
5. iris identification device will export judging identity result.
3. iris image acquiring method as claimed in claim 2, which is characterized in that the calibration of 1. iris images, including it is as follows
Step:
1.1 starting calibration systems, and the first camera is lighted, the first camera is placed into the designated position of calibration system, is opened
Dynamic calibration system simultaneously lights the first camera；
1.2 are fixed on the fine image of the eye for demarcating version on the position of one low coverage, the eyes in the first camera acquisition calibration version
Image, and find size and distance and the first camera shooting that eye contour calculates eyes behind position according to geometrical relationship on the image
The optical axis of head and the relationship of field angle, to establish the fine three-dimensional system of coordinate parameter of eye at low coverage；
The fine images of eye of 1.3 mobile calibration versions in one away from position on, the first camera acquire the eye demarcated in version again
Eyeball image, and find that eye contour calculates the size of eyes according to geometrical relationship behind position on the image and distance and first are taken the photograph
As the optical axis of head and the relationship of field angle, thus the fine three-dimensional system of coordinate parameter of eye away from place in establishing；
On the eye fine image to the position of a long distance of 1.4 mobile calibration versions, the first camera continues the eye in acquisition calibration version
Eyeball image, and find that eye contour calculates the size of eyes according to geometrical relationship behind position on the image and distance and first are taken the photograph
As the optical axis of head and the relationship of field angle, to establish the fine three-dimensional system of coordinate parameter of eye at long distance；
1.5 are calculated finally, being associated by the iris recognition effective coverage parameter of this three groups of parameters of 1.1-1.3 and standard
Compensating parameter, this final compensating parameter are written in this camera system.
4. iris image acquiring method as claimed in claim 3, which is characterized in that the size and distance of eyes and the first camera shooting
The optical axis of head and the relationship calculation of field angle are as follows:
The calculation formula of the calibrating parameters of pupil:
According to magnifying power formula:
Wherein k is magnifying power, and H is that object is high, and h is image height；
According to image-forming principle formula:
Wherein u is object distance, and v is image distance, and f is the focal length of camera；
For the same camera, f, k are fixed；For the same pupil, H is fixed；Therefore there are one by object distance u and image height h
Fixed relationship:
u∝h
When obtaining the image height h of pupil of an image from camera, so that it may know its object distance u；Meanwhile pupil center position will be obtained
Set in the picture relative to arbitrarily selected in image a little as origin, then being achieved with the space of the pupil center location
Coordinate (x, y, z), in which: z=h*s, wherein s is calibration coefficient；
Calibration coefficient we be stored in advance in camera system by calibration system.
5. iris image acquiring method as claimed in claim 4, which is characterized in that first by pupil calibration version placement and camera
Some fixed range d1, can get image height h1 of the pupil under the distance；
Similarly, it can get pupil calibration version and place image height h2 corresponding with some fixed range d2 of camera；
Some fixed range d3 of pupil calibration version placement and camera can also be can get, and obtain corresponding image height d3, therefore
It just can determine the calibration coefficient of the camera:
S ∝ [h1/d1, h2/d2, h3/d3].
6. iris image acquiring method as claimed in claim 2, which is characterized in that the calibration of 2. facial images, including it is as follows
Step:
Second camera, is placed into the designated position of calibration system by 2.1 starting second cameras, is started calibration system and is lighted
Second camera, second camera detect face；
The facial image of 2.2 calibration versions is fixed on the position of a low coverage, and second camera will collect in calibration version
Facial image, and find size and distance and second that facial contour calculates face behind position according to geometrical relationship on the image
The optical axis of camera and the relationship of field angle, to establish the face three-dimensional system of coordinate parameter at low coverage；
The fine images of eye of 2.3 mobile calibration versions in one away from position on, second camera will collect the people in calibration version
Face image, and find that facial contour calculates the size of face according to geometrical relationship behind position on the image and distance and second are taken the photograph
As the optical axis of head and the relationship of field angle, thus the face three-dimensional system of coordinate parameter away from place in establishing；
On the facial image to the position of a long distance of 2.4 mobile calibration versions, second camera will collect the people in calibration version
Face image, and find that facial contour calculates the size of face according to geometrical relationship behind position on the image and distance and second are taken the photograph
As the optical axis of head and the relationship of field angle, to establish the face three-dimensional system of coordinate parameter at long distance；Finally by this three groups of ginsengs
Several and standard recognition of face effective coverage parameter, which is associated, is calculated compensating parameter, this is written in this final compensating parameter
In a camera system.
7. iris image acquiring method as claimed in claim 2, which is characterized in that the calibration of 3. faces and iris, including such as
Lower step: the first camera and second camera are placed into the designated position of calibration system simultaneously, start calibration system and point
Bright first camera and second camera；
3.1 first cameras and second camera obtain the facial image and iris image in calibration version simultaneously, calculate first
The optical axis of camera and the optical axis of second camera, then by calculate calibration version on face location and iris image position with
After geometrical relationship between first camera position and second camera position, by the phase of the first camera and second camera
Fixed location parameter is written in this camera system.
8. iris image acquiring method as claimed in claim 2, which is characterized in that 4. will calibration it is good after the first camera and
Second camera is installed on iris identification device, and iris identification device is communicated with iris authentication system after powered up, including such as
Lower step:
The video that second camera acquires is shown on a display screen, after detecting that face picture occurs in display screen, iris
Face datection unit built in the processor of identification device calculates the position of face, and is read out of camera system according to this position
Then fixed position relative parameter out is matched；
If 4.1 detect that face location is in non-iris recognition regional scope, the mobile face of user is prompted by voice
Position to suitable position, can by include but is not limited on display screen text or/with figure or/prompt with the picture of color
The mobile face location of user can also prompt the mobile mobile human of user to suitable position by voice and display screen picture simultaneously
Face position to suitable position；
4.2 remind user when facial image appears in the top of the display screen, through the display screen or loudspeaker
It needs to squat lower, moves down to user's face in the allowed band of iris recognition；
4.3 remind user when facial image appears in the lower section of the display screen, through the display screen or loudspeaker
It needs to stand higher, makes user's face into the allowed band for moving to iris recognition；
4.4 when facial image appear in the display screen it is bigger than normal when, pass through the display screen or loudspeaker remind user
It needs to stand remote, moves to user's face backward in the allowed band of iris recognition；
4.5 when facial image appear in the display screen it is less than normal when, pass through the display screen or loudspeaker remind user
It needs to stand closer, makes user's face into the allowed band for moving forward to iris recognition；
4.6 once detect that face location enters iris recognition region, then iris identification device stops prompt face location at once
The instruction that no longer needs to adjust and the instruction for issuing starting iris recognition, while starting the first camera and infrared light compensating lamp and obtaining
Take iris image；
Processor carries out iris preprocessing after receiving iris image, then extracts iris feature and coding, then in advance
The iris feature library information first stored compares, and finally exports judging identity result；It is described during iris recognition to show
Display screen picture is from start to finish not in iris image.
9. a kind of iris identification device characterized by comprising
Processor, for receiving and dispatching, parsing control signal, while according to pre-set programs calculating parameter；
First camera, for obtaining iris image；
Second camera, for obtaining facial image；
Infrared light compensating lamp, for carrying out light filling when the first camera 11 acquires iris image；
Display screen, the image acquired for showing second camera 12；
Memory, for the data that storage processor is to be processed or is handling；
Flash memory, for storing data；
Communication interface module, for being connect with external device communication；
First camera, second camera, infrared light compensating lamp, display screen, memory, flash memory, communication interface module signal end difference
It is communicated to connect with processor signal end.
10. iris identification device as claimed in claim 9, which is characterized in that in use, second camera acquires video, and
Real-time pictures processing unit built in realtime video transmission to processor is handled, then shows video in display screen
On；
Face is detected by built-in Face datection unit when real-time pictures processing unit is handled or according to built-in；
The face that Face datection unit will test is compared with the human face data in face database, and it is pre-stored to find out face
Information, face database are stored in flash memory；
For Face datection unit after being matched to face in face database, calling changes the corresponding iris information of face, while starting first
Camera acquires iris image, and iris image is then transmitted to iris recognition unit；
Iris recognition unit is the program being built in processor, the iris information on iris image acquired for identification,
And it is delivered to the judging unit being built in processor jointly with the iris feature library being stored in flash memory and is compared；If than
To passing through, then identification information is exported, it is on the contrary then export identity validation failure information.
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