CN200976149Y - Living body detector for iris recognition - Google Patents
Living body detector for iris recognition Download PDFInfo
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- CN200976149Y CN200976149Y CN 200620107879 CN200620107879U CN200976149Y CN 200976149 Y CN200976149 Y CN 200976149Y CN 200620107879 CN200620107879 CN 200620107879 CN 200620107879 U CN200620107879 U CN 200620107879U CN 200976149 Y CN200976149 Y CN 200976149Y
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Abstract
The utility model relates to a living detection device of iris recognition. The anti-false performance and own security performance in the prior art is not ideal enough. The utility model comprises an intelligent collection unit and a living detection unit, wherein, the intelligent collection unit comprises an image collection module, a near infrared active light source module and an intelligent control module; the living detection unit is an embedded computer. The image collection module comprises a lens, a camera and an image collection card. The near infrared active light source module comprises a near infrared luminous tube, a DC power supply, a control circuit board, a condenser and a scattering light transmission board. The condenser is funnel-shaped, and the internal surface is polished; the material of the scattering light transmission board is transparent, and the rotating sand directions of the internal and external surface are opposite. In order to achieve detection, the utility model directly makes use of an essential characteristic that the living iris and the physiological and physical function of the eyeball can react under the encouragement of light, improving the reliability of the living detection.
Description
Technical field:
The utility model belongs to the technical field of living things feature recognition and information security, the living body detection device in particularly a kind of iris recognition.
Background technology:
Identity recognizing technology based on iris is one of biometrics identification technology that rose gradually in recent years, come into operation within the specific limits, for example: the immigration management of the United Arab Emirates and evictee's tracker (The UAE Iris Expellees Tracking and Border ControlSystem, The Proceeding of Biometrics consortium conference 2005, Hyatt Regency Crystal City, Arlington, VA, USA) or the like, the accuracy and the unfailing performance that show iris recognition are very outstanding, but a necessary prerequisite is: the biological attribute data of iris can only be owned by legal identity user.It is the key issue of present iris authentication system self-security that living body iris detects, and also is one of the direction of the primary study of iris recognition technology.Attack based on the security of the identification system of iris is mainly concentrated on the iris data aspect, for example: utilize the iris deception recognition system of forging, thereby obtain authority of legal identity or the like.Because what iris recognition was handled is view data, so the iris that utilizes photo, pad pasting or the like means to forge is usually cheated the iris capturing device.Produced various method for anti-counterfeit thus, for example: judging whether be the iris of forging according to the composition of various frequency contents in the image of gathering, is exactly present main research direction and method; But if use different materials to come false iris images, also can change the frequency content of image, perhaps utilize certain material to come iris image texture that is virtually reality like reality, all may avoid the purpose that this detection method reaches deception.
Summary of the invention:
The purpose of this utility model is exactly at the deficiencies in the prior art, a kind of living body detection device of iris is provided, being conceived to iris is the organism of a work, utilize the physical characteristics of eyeball optics system and the physiological property of iris uniqueness, detect the eyeball whether iris of being gathered comes from live body, strengthen the anti-pseudo-performance of iris authentication system and the security performance of self.
The utility model comprises intelligent data collecting unit and live body detecting unit, and signal connects between intelligent data collecting unit and the live body detecting unit.Wherein intelligent data collecting unit comprises image capture module, near infrared initiatively light source module and intelligent control module; The live body detecting unit is an embedded computer.
Image capture module comprises camera lens, camera and image pick-up card.The output of camera is by the video input interface of video signal cable incoming image capture card, and camera lens is connected by adapter ring with camera.Image pick-up card adopts existing product, for example CG400.
Near infrared initiatively light source module comprises near-infrared luminous pipe, direct supply, control circuit board, snoot and scattering light-passing board.Two pins of near-infrared luminous pipe are connected with the direct supply two ends, and near-infrared luminous pipe is fixed on the control circuit board, and control circuit board is fixed in wealthy mouthful of end of snoot; The scattering light-passing board is fixed in snoot slot one end.Image capture module is fixedly installed in the snoot along the central axis of snoot.
Described snoot is an infundibulate, the inside surface polishing, and described scattering light-passing board is a transparent material, the rotation frosted direction of its surfaces externally and internally is opposite.Intelligent control module is a microprocessor, can produce control signal according to random series, operate the conducting of near-infrared luminous pipe and end by control circuit board, and import the live body detecting unit together with the figure notation of the random series of real-time control signal correspondence and in the realtime graphic sequence that this control signal hypograph acquisition module collects.This microprocessor adopts existing product, for example PC104.
The embedded computer of live body detecting unit detects the feature of scattering light-passing board imaging in the image sequence that is collected, and the feature of pupil edge convergent-divergent; According to the feature of extracting, contrast the figure notation of real-time control signal more then, the feature of utilization storage in advance and the mapping table of control signal are compared and are judged, finish the living body iris measuring ability.
The utility model utilizes the physiology and the physical characteristics of iris and people's eyeball, produces control signal according to random series and controls near-infrared light source, and store the figure notation of this random series correspondence; Be captured in iris and the aitiogenic image sequence of eyeball under this light source excitation, and extract the feature of pupil edge convergent-divergent and the feature of scattering light-passing board imaging; Realize whether being the detection of living body iris according to the corresponding relation of this feature and figure notation.
The utility model compared with prior art, on overall plan, abandoned the whether thinking that detects of the frequecy characteristic of the directly related iris texture of live body of dependence and iris, directly utilize the iris of live body and the physiology of eyeball and this essential characteristic of reaction that the physics function can produce under the excitation of light to realize detecting, improved the reliability that live body detects.
Because the utility model adopts the method that produces the control signal of near-infrared light source according to random series at intelligent data collecting unit, make that control signal is difficult to tracked and duplicates in gathering in real time, strengthened the correctness and the security that detect.
Because the utility model extracts the feature of scattering light-passing board imaging in the image sequence that collects and the feature of pupil edge convergent-divergent simultaneously in the employing of live body detecting unit, strengthened the robustness that detects.
Description of drawings:
Fig. 1 is the structural representation of intelligent data collecting unit;
Fig. 2 is the electric principle schematic of control circuit board.
Embodiment:
Below in conjunction with drawings and Examples the utility model is further specified.
Living body detection device in the iris recognition comprises intelligent data collecting unit and live body detecting unit.In intelligent data collecting unit, intelligent control module produces the initiatively control signal of light source module of near infrared according to random series, under the effect of this control signal, near infrared active light source module provides the near infrared imaging light source of cycle variation, image capture module is gathered the image of iris in each cycle that light source changes, then will such set of diagrams picture and the figure notation of the control signal correspondence of intelligent control module generation import the live body detecting unit together; The characteristic extracting module of live body detecting unit is carried out Iris Location to image earlier, extract the feature of scattering light-passing board imaging in the image and the feature that pupil boundary changes again, the comparison judge module realizes judging detection according to the formation corresponding relation of the figure notation of feature of being extracted and control signal with reference to the correct relation table of having stored.
Fig. 1 has provided the agent structure synoptic diagram of intelligent data collecting unit in biopsy method in the iris recognition and the device: link to each other with adapter ring 3 between video automatic diaphragm lens 1 and the highly sensitive camera 2, video output terminal 7 links to each other with image pick-up card by video line; Scattering light-passing board 4 is an annular, embeds the end of snoot 5 near the video automatic diaphragm lens, and the front end driving fit of video automatic diaphragm lens 1 embeds the endoporus of scattering light-passing board 4, and is concordant with the anchor ring of scattering light-passing board 4; Control circuit board is fixed on the end of snoot 5 away from the video automatic diaphragm lens with screw, and middle perforate allows the rear end driving fit of highly sensitive camera 2 pass; Near-infrared luminous pipe 6 is welded on the place of close snoot 5 inwalls on the control circuit board 8, evenly distributes along snoot 5 inwalls, and the light that makes near-infrared luminous pipe 6 as much as possible send sees through scattering light-passing board 4 through snoot reflection back.
Fig. 2 has provided the electric principle schematic of control circuit board in biopsy method in the iris recognition and the device: after each near-infrared luminous pipe 13 and protective resistance 12 series connection, be connected direct supply 10 two ends; The break-make of time-delay/guard relay 9 control entire circuit, the control signal that the trigger end 11 of time-delay/guard relay 9 is accepted according to the random series generation.
Table 1 has provided the biopsy method and the feature of the judge module extraction of installing institute's reference and the correct corresponding relation of figure notation of control signal in the present embodiment iris recognition, " ★ " is illustrated under the condition of random series of control signal as shown in Table, the feature that judge module extracts only forms corresponding relation in this position, if and only if when all " ★ " occur in the position shown in the table, and being illustrated in the detected iris of this time is live body.
During installation, connect video automatic diaphragm lens 1 and highly sensitive camera 2 with adapter ring 3 earlier, connect the video input terminal 7 of highly sensitive camera 2 and the video inputs of image pick-up card with vision cable then; Control signal wire with intelligent control module c is connected to the initiatively control end of light source module b of near infrared again, and the output of direct supply is connected to the initiatively power end of light source module b of near infrared, finishes the installation of intelligent data collecting unit; Installation procedure soft according to the common application computing machine then, hardware is installed the live body detecting unit.
The use operating process of this device is as follows:
The user is positioned at camera lens the place ahead of intelligent data collecting unit, makes image capture module a can collect user's iris image, finishes prompt tone up to hearing to gather; During this period of time, intelligent control module has produced 5 control signals according to random series, near infrared initiatively light source module controls under the effect of these control signals that near-infrared luminous pipe 6 is finished 5 conductings or by the cycle, each cycle kept 0.5 second, image capture module is gathered a width of cloth iris image in each cycle, the figure notation of the control signal that these images and its corresponding intelligent control module are produced is imported the live body detecting unit together then; The characteristic extracting module of live body detecting unit positions processing respectively to each width of cloth image, extract the feature of scattering light-passing board 4 imagings in the image and the boundary characteristic of pupil, compare judge module then according to the feature of characteristic extracting module gained and the figure notation of its corresponding control signal, compare with correct mapping table again, finish the function that the iris live body detects, and the output testing result.
In the present embodiment, image capture module adopts video automatic diaphragm lens, highly sensitive CCD camera and high speed image acquisition board, satisfies and regulates automatically under aperture and the low light conditions, the requirement of high speed acquisition image; Scattering light-passing board 4 in the near infrared active light source module is an annular, selects for use acrylic board to make, 3 millimeters of thickness, and the rotation frosted direction of surfaces externally and internally is opposite, to guarantee dispersion effect; Snoot 5 adopts infundibulate, and the inside surface polishing is to strengthen the reflection of light, and less near the port footpath of camera lens, the bore of the other end is bigger; The microprocessor of intelligent control module produces control signal according to random series, is transferred to the initiatively control end of light source module of near infrared by address wire, through the time-delay/guard relay on the control circuit board 89 switch near-infrared luminous pipe 6 conducting and by; The retention time of time-delay/guard relay 9 is 0.5 second, and microprocessor is controlled visual acquisition module and gathered a secondary bow film image in the second half section of each retention time simultaneously, and this image and corresponding control signal figure notation are transferred to the live body detecting unit together; Characteristic extracting module is extracted the feature of scattering light-passing board 4 imagings in the image and the feature of pupil boundary after image is positioned processing, just whether have the running parameter of the speck and the pupil radius of annular in pupil; The comparison judge module is according to the corresponding relation of the figure notation of these the two kinds of features that obtain in real time and control signal, the table of comparisons 1, and what be in " ★ " mark position then is judged as living body iris, and remaining is exactly the non-living body iris.
Claims (1)
1, the living body detection device in the iris recognition is characterized in that this device comprises intelligent data collecting unit and live body detecting unit, and signal connects between intelligent data collecting unit and the live body detecting unit; Wherein intelligent data collecting unit comprises image capture module, near infrared initiatively light source module and intelligent control module; The live body detecting unit is an embedded computer;
Image capture module comprises camera lens, camera and image pick-up card; The output of camera is by the video input interface of video signal cable incoming image capture card, and camera lens is connected by adapter ring with camera;
Near infrared initiatively light source module comprises near-infrared luminous pipe, direct supply, control circuit board, snoot and scattering light-passing board; Two pins of near-infrared luminous pipe are connected with the direct supply two ends, and near-infrared luminous pipe is fixed on the control circuit board, and control circuit board is fixed in wealthy mouthful of end of snoot; The scattering light-passing board is fixed in snoot slot one end; Image capture module is fixedly installed in the snoot along the central axis of snoot;
Described snoot is an infundibulate, the inside surface polishing; Described scattering light-passing board is a transparent material, and the rotation frosted direction of its surfaces externally and internally is opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620107879 CN200976149Y (en) | 2006-09-21 | 2006-09-21 | Living body detector for iris recognition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620107879 CN200976149Y (en) | 2006-09-21 | 2006-09-21 | Living body detector for iris recognition |
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| CN200976149Y true CN200976149Y (en) | 2007-11-14 |
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| CN 200620107879 Expired - Fee Related CN200976149Y (en) | 2006-09-21 | 2006-09-21 | Living body detector for iris recognition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704355A (en) * | 2016-03-18 | 2016-06-22 | 青岛歌尔声学科技有限公司 | Visual angle turning apparatus for pick-up head, shooting equipment, and correlated shooting method |
-
2006
- 2006-09-21 CN CN 200620107879 patent/CN200976149Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704355A (en) * | 2016-03-18 | 2016-06-22 | 青岛歌尔声学科技有限公司 | Visual angle turning apparatus for pick-up head, shooting equipment, and correlated shooting method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071114 Termination date: 20091021 |