A kind of facial image and iris image gather optical devices and identity identifying method thereof simultaneously
Technical field
The invention belongs to biometrics identification technology field, be specifically related to a kind of facial image and iris image gathers optical devices and identity identifying method thereof simultaneously.
Background technology
Along with people take precautions against improving constantly of rank to important place safety, the access control system based on single human body biological characteristics identification can not meet the demands.For this reason, need development based on the access control system of two or more living things feature recognition of human body, to improve the safety precaution rank of access control system further.Face and iris are the important biological characteristics of two kinds of human body, may be used for authentication.In order to improve the safety precaution rank of gate control system, can by these two kinds of biometrics identification technology conbined usage in a set of access control system, what realize face and iris two kinds of biological characteristics combines identification.Only have face and iris all by certification, user could be allowed to pass through checking.Need to research and develop a kind of optical devices simultaneously gathering user's facial image and iris image for this reason.
At present, market has occurred the human face image collecting device of simple function and the iris image acquiring device of simple function, there is no can the optical devices of simultaneously clear collection facial image and iris image.According to statistics, the size of face is generally 110mm × 200mm, and human iris's mean diameter is φ 12mm, and namely face size is 9-17 times of iris, so face size differs comparatively large with iris dimensions, clearly cannot gather facial image and iris image with a set of common optical devices simultaneously.As gathered iris image with man face image acquiring optical devices, then iris image is too little and its details cannot be differentiated.Otherwise, gather facial image with iris image acquiring device, then cannot obtain complete facial image.
Summary of the invention
Goal of the invention: for the deficiencies in the prior art, the object of this invention is to provide a kind of facial image and iris image gathers optical devices simultaneously, clearly can gather facial image and the iris image of user simultaneously, have higher security.Another object of the present invention is to provide the identity identifying method that a kind of above-mentioned facial image and iris image gather optical devices simultaneously.
Technical scheme: in order to realize foregoing invention object, the technical solution used in the present invention is:
A kind of facial image and iris image gather optical devices simultaneously, comprise man face image acquiring module and iris image acquiring module; Described man face image acquiring module is made up of preposition imaging lens group, Amici prism, face video camera, graphics processing unit and lighting source; Described iris image acquiring module is made up of preposition imaging lens group, Amici prism, iris camera assembly, graphics processing unit and lighting source; Described man face image acquiring module and iris image acquiring module share preposition imaging lens group, graphics processing unit and lighting source, and realize being separated of man face image acquiring module light path and iris image acquiring module light path by Amici prism.
Described Amici prism is formed by two right-angle prisms gummeds, and cemented surface is coated with Dichroic Optical film.
Described iris camera assembly is made up of the sub-imaging optical path of 2 parallel placements, and the enlargement ratio of described 2 sub-imaging optical paths is identical and be all greater than 1, can the clear iris image gathering two eyes in left and right simultaneously.
The enlargement ratio of described man face image acquiring module equals the enlargement ratio of preposition imaging lens group, and the enlargement ratio that total enlargement ratio of described iris image acquiring module equals the enlargement ratio of preposition imaging lens group and iris camera assembly neutron imaging light path is long-pending.
Described lighting source is made up of two sub-light sources, from the left and right sides symmetrical illumination face of face, to make the illumination obtaining uniformity in face gamut.
Described facial image and iris image gather the identity identifying method of optical devices simultaneously, comprise the following steps:
1) facial image of man face image acquiring module acquires user is utilized;
2) extract the feature of facial image collected, and compare with the face characteristic information that stores in graphics processing unit, as comparison is unsuccessful, then quit work; Otherwise enter step 3);
3) iris image of iris image acquiring module acquires user two eyes is utilized;
4) extract the feature of two width iris images collected respectively, and compare with the iris feature information that stores in graphics processing unit, as comparison success, then user passes through authentication; Otherwise quit work.
Beneficial effect: compared with prior art, the present invention has following technique effect:
1) the present invention is made up of man face image acquiring module and iris image acquiring module, two image capture modules work alone, and the enlargement ratio of iris image acquiring module is greater than 1, thus the present invention clearly can gather facial image and the iris image of user simultaneously.
2) the man face image acquiring module in the present invention and iris image acquiring module share preposition imaging lens group, lighting source, the optical axis coincidence of two image capture modules, the facial image obtained and iris image have the positioning relation determined, are convenient to the extraction of successive image process, face characteristic and iris feature.
3) the advanced row recognition of face of the present invention, only has face by certification, just can carry out iris recognition, and and if only if two kinds of biological characteristics all pass through certification, user is just by authentication, and what can realize user's face and iris two kinds of biological characteristics combines identification, and security is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation that facial image and iris image gather optical devices simultaneously;
Fig. 2 is the structural representation of iris camera assembly.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
As shown in Figure 1, for facial image of the present invention and iris image gather optical devices simultaneously, primary structure comprises man face image acquiring module and iris image acquiring module.Wherein, man face image acquiring module is made up of preposition imaging lens group 1, Amici prism 2, face video camera 5, graphics processing unit 6, first lighting source 701, second lighting source 702.Iris image acquiring module is made up of preposition imaging lens group 1, Amici prism 2, iris camera assembly 4, graphics processing unit 6, first lighting source 701, second lighting source 702.Man face image acquiring module and iris image acquiring module share preposition imaging lens group 1, graphics processing unit 6, first lighting source 701, second lighting source 702, and realize man face image acquiring module by Amici prism 2 and be separated with the light path of iris image acquiring module.
The enlargement ratio of preposition imaging lens group 1 is between 0.044 ~ 0.12 times, intactly images on the target surface of face video camera 5 to make face.The target surface size of face video camera 5 is between 11mm × 8.8mm to 36mm × 24mm.
Amici prism 2 is formed by two right-angle prisms gummeds, and its cemented surface 201 is coated with Dichroic Optical film.This Dichroic Optical film can be a point amplitude type, also can be a point wave length type.When Dichroic Optical film is that when dividing amplitude type, then facial image and iris image are with the illumination light imaging of phase co-wavelength.When Dichroic Optical film is that when dividing wave length type, then facial image is with visual light imaging, and iris image is with near-infrared wavelength imaging.
As shown in Figure 2, be iris camera assembly 4 in the present invention, this iris camera assembly 4 is made up of the sub-imaging optical path of two parallel placements, can gather the iris image of user's two eyes simultaneously.Wherein the first sub-imaging optical path is made up of the first amplification imaging mirror group 401 and the first iris video camera 403, and the second sub-imaging optical path is made up of the second amplification imaging mirror group 402 and the second iris video camera 404.The enlargement ratio of these two sub-imaging optical paths is identical and be all greater than 1, can between 6.1 ~ 16.7 times, thus the iris image 301 and 302 at intermediate image plane 3 place formed by preposition imaging lens group 1 after amplifying respectively on the complete target surface clearly imaging in the first iris video camera 403 and the second iris video camera 404.
The enlargement ratio of man face image acquiring module equals the enlargement ratio of preposition imaging lens group 1, namely between 0.044 ~ 0.12 times.The enlargement ratio that total enlargement ratio of iris image acquiring module equals the enlargement ratio of preposition imaging lens group 1 and iris camera assembly 4 neutron imaging light path is long-pending, namely between 0.268 ~ 2.004 times.
The target surface of the first iris video camera 403 and the second iris video camera 404 is measure-alike, between 11mm × 8.8mm to 36mm × 24mm.
First lighting source 701, second lighting source 702 is wideband light source, and its emission wavelength is the continuous spectrum from 400nm to 850nm.First lighting source 701, second lighting source 702 from the left and right sides symmetrical illumination face 8 of face, to make the illumination obtaining uniformity in face 8 gamut.
Utilize above-mentioned facial image and iris image simultaneously to gather optical devices carry out authentication method to user, process is as follows:
1) facial image of man face image acquiring module acquires user is utilized.
2) extract the feature of the facial image collected, and compare with the interior face characteristic information stored of graphics processing unit 6, as comparison is unsuccessful, then quit work; Otherwise enter step 3).
3) iris image of iris image acquiring module acquires user two eyes is utilized.
4) extract the feature of the two width iris images collected respectively, and compare with the interior iris feature information stored of image procossing first 6, as comparison success, then user passes through authentication; Otherwise quit work.
This facial image and iris image gather optical devices simultaneously, and typical structural parameters are: the enlargement ratio of preposition imaging lens group 1 is 0.12 times; Amici prism 2 is a point wave length type, the visible ray of Dichroic Optical film reflector 400nm ~ 800nm that its cemented surface 201 is coated with, the near infrared light of transmission 800nm ~ 850nm; The target surface of face video camera 5 is of a size of 36mm × 24mm, the face being of a size of 110mm × 200mm on face video camera 5 target surface become image to be of a size of 13.2mm × 24mm.The iris that diameter is f12mm at intermediate image plane 3 place become the diameter of iris image 301 and 302 to be f1.44mm; The enlargement ratio of the first amplification imaging mirror group 401 and the second amplification imaging mirror group 402 is 6.1 times, the iris that diameter is f12mm the first iris video camera 403 with on the second iris video camera 404 target surface become image to be of a size of f8.8mm; The target surface of the first iris video camera 403 and the second iris video camera 404 is measure-alike, is 11mm × 8.8mm.The enlargement ratio of man face image acquiring module equals the enlargement ratio of preposition imaging lens group 1, is 0.12 times.Total enlargement ratio of iris image acquiring module is 0.732 times.First lighting source 701, second lighting source 702 is broadband LED, and its emission wavelength is the continuous spectrum from 400nm to 850nm.
Utilize above-mentioned facial image and iris image to gather optical devices to the process that user carries out authentication to be: when user enters facial image of the present invention and iris image gathers the effective coverage of optical devices simultaneously simultaneously, graphics processing unit 6 first gathers the image of user's face 8, extract the characteristic information of face 8 image, compare with the face characteristic information stored in graphics processing unit 6, if comparison is unsuccessful, then quit work; If comparison success, then graphics processing unit 6 gathers the iris image of two eyes of user further, extracts the characteristic information of the two width iris images collected, and compares with the interior iris feature information stored of graphics processing unit 6, as comparison success, then user passes through authentication; Otherwise quit work.
Visible, what the present invention can realize user's face and iris two kinds of biological characteristics combines identification, has increased substantially the level of security that employing facial image of the present invention and iris image gather the access control system of optical devices simultaneously.