CN1584917A - Living body iris patterns collecting method and collector - Google Patents
Living body iris patterns collecting method and collector Download PDFInfo
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- CN1584917A CN1584917A CN 200410047920 CN200410047920A CN1584917A CN 1584917 A CN1584917 A CN 1584917A CN 200410047920 CN200410047920 CN 200410047920 CN 200410047920 A CN200410047920 A CN 200410047920A CN 1584917 A CN1584917 A CN 1584917A
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Abstract
A method for collecting living body iris image includes confirming dynamic image being eye image, counting up eye image grey scale value to find out initial pupil centre, collecting a series of eye image in different focal surface to make image quality evaluation in order to confirm the best quality iris image.
Description
Technical field
The invention belongs to living things feature recognition and automatic identity authentication technique field, particularly living body iris acquisition technology.
Background technology
Growing along with Information technology, biometrics identification technology also more and more is dissolved in the daily life, and for the such country that has numerous populations of China, biometrics identification technology especially is with a wide range of applications and technical meaning.Because the frequency for Authority Verifications at different levels in the areas of information technology obviously increases, access to your password, cryptographic means such as IC-card stolen by the people easily, adds that meeting such as incident such as losss grade brings inconvenience to the user.Yet living things feature recognition has the not available advantage of other identity identification system, this provides solid technical foundation for it becomes safe and practical security terminal, and conveniently biometrics identification technology relies on this carrier of Internet to make its (living things feature recognition) become following information security terminal optimal selection.
Iris recognition technology is exactly to utilize the difference of human eye's iris texture to discern a kind of living things feature recognition mode of people's identity, compares with other biometrics identification technology, and iris recognition has very high discrimination, stability and antifalsification.The living body iris image acquisition is the key of iris recognition technology, the iris image quality quality that is collected will directly influence the discrimination of total system, Fig. 1 is a width of cloth has the hot spot noise at iris region a iris image, iris 11 is between sclera 12 and pupil 14, illumination hot spot noise 13 and 15 is arranged on iris 11 zones, illumination hot spot noise 13 and 15 will cause the part textural characteristics of iris 11 to lose, and this will influence the discrimination of system.
The mode of living body iris image acquisition mainly contains following two kinds at present:
Fixedly eyes focus acquisition method.This method is to allow the user that eyes are abutted on the stationary installation before the camera lens, and the iris position obtains iris image with the CCD camera collection then on the focussing plane of camera lens blur-free imaging.For example: on August 16th, 2000, disclosed patent CN 2392219Y was exactly a harvester of realizing this method, the sectional view of this apparatus structure as shown in Figure 2, agent structure comprises that there is frosted glass 22, infrared transmitting tube 23, light emitting diode 24 and the CCD camera 25 of transparent window at shell 21, middle part, by the picker front end face 211 (focussing plane of camera lens blur-free imaging) that the eyes position abuts in shell 21 is got final product in the time of collection.This mode can obtain comparatively distinct image, but to the user is a kind of acquisition mode that infringement is arranged, because the user must abut in eyes on the device before the camera lens, eyes are irritated easily organs, if under the frequent occasion of using, just may cause the cross-infection of disease of eye, and gatherer process is not convenient yet.
2. the acquisition method of manually focusing.This method be given user at the previous less focusing range of camera lens, allow the user in this scope, watch camera lens attentively and move forward and backward, collect a width of cloth comparatively clearly till the iris image up to device.The BM-ET100US that releases of PANASONIC for example.This method significant disadvantages is exactly its not enough hommization of focusing mode, require the user constantly to adjust own position and just can adopt iris image clearly, if taking long to focus probably, a unfamiliar user just can collect a width of cloth distinct image, Fig. 3 is the iris image that this method obtains, and the iris 31 of the image that can obviously find out this method and collected is also clear inadequately.
This shows that fixedly the acquisition method that focuses of eyes is not a kind of acquisition mode that does not have infringement concerning the user, it is not suitable for being applied to the public arena, and this has limited the popularization of iris recognition technology.And artificial focusing mode has been brought inconvenience to the user, and this will directly influence the efficient of iris recognition, and the image that this mode is gathered is clear inadequately, also can influence to some extent discrimination.
Summary of the invention
The objective of the invention is for overcoming the weak point of existing acquisition method, a kind of living body iris image-pickup method and harvester are proposed, detect and the image quality measure method based on intelligentized eye position, big apart from setting range, adjust easily, the user only need stand in and watch camera lens several seconds in the scope of camera lens regulation attentively, and Acquisition Instrument just can collect iris image clearly apace, and the iris image that can tentatively be split, to reach the requirement of real-time iris authentication system.
A kind of living body iris image-pickup method that the present invention proposes comprises that eye position detects and two parts of image quality measure; Specifically may further comprise the steps:
1) adjustment is made its eyes be in camera within sweep of the eye by picker's front and back position, and camera constantly transmits the dynamic image that collects;
2) when dynamic image when secretly brightening, in entire image, sample, if the gray-scale value of center section image is lower than the gray-scale value of image on every side, then confirming as is eye image;
3) statistics eye image gray-scale value finds gray-scale value lowermost extent central point, and this point is set at initial pupil center;
4) set the gray difference threshold of an eye image and the Grads threshold of gray scale, from this initial pupil center up and down about four sides carry out rim detection, and satisfy following three conditions: detect gray scale difference greater than the gray difference threshold of described setting (herein for be the edge of pupil); The Grad that detects gray scale surpasses the Grads threshold of the gray scale of described setting, detects initial pupil center coordinate again and whether is in the picture centre position;
5) if any one condition does not satisfy described in the step 4), then point out and continue to adjust by picker's front and back position by the ungratified cue of expression condition, all satisfy up to described three conditions, then the signal that begins to gather by expression is pointed out by the picker and is watched camera lens attentively and keep motionless;
6) automatic dollying head before and after, the eye image of gathering a series of different focal planes carries out image quality measure, determines top-quality iris image; The concrete grammar of image quality measure can adopt known conventional method, also can adopt following method, to reach effect preferably, this method is: select a fixed area on the eye image, whole graded is asked in this piece zone on every two field picture, and the image of getting a graded maximum at last is defined as top-quality iris image.
The method of the invention also can further comprise the 6th) iris image that obtains of step cuts apart the iris image that is tentatively split; The concrete grammar of cutting apart is: the illumination hot spot in the pupil inner region is filled to black, again according to the distribution statistics that carries out again gray-scale value, find grey value profile minimum a bit, and in conjunction with the edge detection calculation of pupil go out up and down and about four radiuses, average according to these four radiuses, obtain the final radius of pupil; Utilize Hough (Hough) conversion to obtain the centre coordinate and the radius of the cylindrical of iris then; Radius and centre coordinate according to pupil and iris cylindrical all cut away the pupil of iris inside and other outside image the iris image of remaining image section for tentatively splitting.
The present invention proposes to realize a kind of living body iris image collecting device of said method, comprise a base, be installed in one dimension travelling table and drive motor thereof on this base, cue device of on this travelling table, installing and CCD camera, and the computing machine that is connected with the CCD camera, eye position is housed in this computing machine detects and the image quality measure module; A plurality of infraluminescence pipes that distributing equably on every side of the camera lens of this CCD camera, cold mirror is equipped with in camera lens the place ahead of this CCD camera, and this cold mirror adopts visible light to be reflected the optical filter that the part infrared light can pass through; Control circuit and the power supply that is connected with computing machine is installed in the worktable rear end, and this computing machine sends instructions and moves forward and backward show state with the cue device to control circuit control travelling table.
Technical characterstic of the present invention and effect:
(1) with the way of image detect focusing from: this is one and replaces other distance measuring method and detect the method that whether has eyes to occur.In the implement device of the inventive method, because the cold mirror of installing before the camera lens of giving out light can leach visible light, in the time of before not having the user to stand in device, the infrared light of the infraluminescence pipe emission around the camera lens can not be reflected, so just enter camera without any light, the figure kine bias is dark; Dynamic image can brighten in the time of before the people stands in camera lens, start eye position this moment and detect, and definite eyes is within the distance range of collection.
(2) focusing automatically: drive the image of gathering when camera lens is realized motion in one dimension on a series of different focussing planes by motion, therefrom select distinct image.
(3) utilize the way evaluate image quality of asking image difference.
(4) iris region is cut apart automatically: utilize Hough (Hough) conversion to obtain the interior circle and the cylindrical parameter of iris to the picture rich in detail that collects, only iris image is remained the iris image of tentatively being cut apart.
Living body iris acquisition method of the present invention and device thereof are used for the iris living things feature recognition, can finish the collection of iris image, and further can finish tentatively cutting apart of iris image.
The image definition that the present invention gathers is than higher, and is very obvious at the feature texture in iris image zone, and the hot spot noise that do not throw light on, and do not need extra subsequent treatment.
Digital camera of the present invention is a PnP device, can directly be connected with computing machine, gives computing machine with the iris image of gathering in real time with the mode dynamic transmission of video.
Description of drawings
Fig. 1 is the iris image that the hot spot noise is arranged of existing method collection.
Fig. 2 is the existing device that focuses acquisition method.
The iris image sample that Fig. 3 is gathered for the BM-ET100US of Panasonic type iris image acquiring instrument.
Fig. 4 is a method flow diagram of the present invention.
Fig. 5 is a structural representation of the present invention.
Fig. 6 is control circuit figure of the present invention.
Fig. 7 is the iris image sample that the present invention gathered.
Fig. 8 is the preliminary iris region image that splits of the present invention.
Embodiment
A kind of living body iris image-pickup method that the present invention proposes and device reach embodiment in conjunction with the accompanying drawings and are described in detail as follows.
The embodiment flow process of the inventive method may further comprise the steps as shown in Figure 4:
1) adjustment is made its eyes be in camera within sweep of the eye by picker's front and back position, and camera constantly transmits the dynamic image that collects;
2) when dynamic image when secretly brightening, in entire image, sample, if the gray-scale value of center section image is lower than the gray-scale value of image on every side, then confirming as is eye image;
3) statistics eye image gray-scale value finds gray-scale value lowermost extent central point, and this point is set at initial pupil center;
4) set the gray difference threshold of an eye image and the Grads threshold of gray scale, from this initial pupil center up and down about four sides carry out rim detection, and satisfy following three conditions: detect described gray scale difference greater than preset threshold, be is the edge of pupil herein; Detect described Grad and surpass the Grads threshold of setting, detect initial pupil center coordinate again and whether be in the picture centre position;
5) if any one condition does not satisfy described in the step 4), then point out and continue to adjust by picker's front and back position by the ungratified cue of expression condition, all satisfy up to described three conditions, then the signal that begins to gather by expression is pointed out by the picker and is watched camera lens attentively and keep motionless;
6) automatic dollying head before and after, the eye image of gathering a series of different focal planes carries out image quality measure, determines top-quality iris image; The concrete grammar of image quality measure is: select a fixed area on the eye image, whole graded is asked in this piece zone on every two field picture, the image of getting a graded maximum at last is defined as top-quality iris image;
7) to the 6th) iris image that obtains of step tentatively cuts apart, and obtains iris image; The concrete grammar of cutting apart is: the illumination hot spot in the pupil region is filled to black, again according to the distribution statistics that carries out again gray-scale value, find grey value profile minimum a bit, and in conjunction with the edge detection calculation of pupil go out up and down and about four radiuses, average according to these four radiuses, obtain the final radius of pupil; Utilize Hough (Hough) conversion to obtain the centre coordinate and the radius parameter of the cylindrical of iris then; Radius and centre coordinate according to pupil and iris cylindrical all cut away the pupil of iris inside and other outside image the iris image of remaining image section for tentatively splitting.
The general structure of the device embodiment of realization the inventive method as shown in Figure 5, it comprises table base 51, stepper motor 52 and electric-controlled box 53 all are fixed on the table base 51, stepper motor 52 is by leading screw 54 transmission travelling tables 55, the top of travelling table 55 support 56 stationary digital cameras 57, around the telephoto lens 58 of digital camera 57 is infrared light supply 59, the top of telephoto lens 58 is LED lamps 510, a cold mirror 511 is arranged before the telephoto lens 58, also comprise serial communication interface 512 and USB interface 513 in addition, USB interface 513 is used for digital camera 57 and uploads view data for computing machine 514, and serial communication interface 512 is used for computing machine 514 and gives electric-controlled box 53 sending controling instructions.
Each functions of components of present embodiment is described as follows:
Electric-controlled box 53 mainly comprises power supply and control circuit two parts: power supply is given control circuit, stepper motor 52, infrared light supply 59 and the power supply of LED lamp; Control circuit is by serial communication interface receiving computer steering order control step motor 52 and LED lamp 510; Promptly the control step motor 52 that requires according to program is just changeing counter-rotating, and the prompting state of control LED lamp 510.
It is the conventional ripening circuit that the control circuit of present embodiment adopts the AT90S8515 chip microcontroller, its structure comprises that single-chip microcomputer and respectively coupled reset switch 61 and external crystal-controlled oscillation 64, single-chip microcomputer setting are with lower port: control port 68, microcontroller power supply 69 that the control port 67 of the interruptive port 63 of serial port 62, limit switch, single-chip microcomputer interface of the ground wire 65, LED lamp 510, stepper motor 52 rotate and the port of reserving 66 as shown in Figure 6.
The main effect of leading screw 54 is that motion is transmitted, and will rotatablely move becomes rectilinear motion.
The effect of travelling table 55 is still image collecting devices, and drives them and move forward and backward, to reach the purpose of focusing.
The effect of support 56 is to connect travelling table 55 and digital camera 57, and digital camera is stabilized on the travelling table, avoids shake occurring in the process of mobile collection, guarantees the sharpness of image.
The effect of digital camera 57 is exactly an images acquired, and it is converted to the digital picture of calculating function identification, is uploaded to computing machine by USB interface.
Telephoto lens 58 is that focal length is the CCD camera lens of 25mm, and it is equivalent to the camera lens of common 35mm slr camera 100mm, so the CCD camera lens of 25mm is a telephoto lens with respect to general camera; Selecting the telephoto lens purpose for use is in order to reduce the depth of field, to obtain the iris image of enough areas.
The effect of LED lamp 510 is to user's prompting, comprises a red LED and green LED.Green LED does not continue luminous when having the user to stand in before the camera lens, red LED will continue luminous in case there is the user to knock out near the camera lens green LED, prompting is used in the eyes of aiming at oneself in the cold mirror by the picker and also suitably moves forward and backward, make eyes apart from the distance of camera lens between 20cm-30cm, in case beginning flicker, red LED just illustrates that worktable begins to move, the user will watch camera lens attentively during this period always, not careless again shift position, when glimmering, green LED shows to gather to finish that the user can leave camera lens.
The workflow of present embodiment is as follows:
1) serial communication interface 512 correctly is connected with computing machine with USB interface 513, with the switch opens on the electric-controlled box 53, at this time green LED is luminous after allowing, and the user stands before the Acquisition Instrument and 511 eyes of seeing oneself in cold mirror;
2) when dynamic image when secretly brightening, and in entire image, sample, every two field picture size is 640 * 480, image is divided into 12288 5 * 5 sub-piece, the value of some pixels is represented the gray-scale value of this sub-piece in the middle of extracting, if the gray-scale value of entire image center section image sampling is lower than the gray-scale value of image sampling on every side, then confirming as is eye image, and this moment, red LED began flicker;
3) will set the template of one 80 * 80 pixel earlier, in image according to step 2) in to set sampling coordinate center be the centre coordinate of this template, the gray-scale value of 80 * 80 pixel images in the statistical mask, the center of template once just moves to the center of next height piece in every statistics, can in entire image, find like this gray-scale value minimum a bit, this point is set at initial pupil center;
4) set the Grads threshold (for example 50) of the gray difference threshold (for example 80) and the gray scale of an eye image by experiment, from initial pupil center up and down about four sides carry out rim detection, when detecting gray scale difference greater than 80, then think the edge of pupil, and Grad was above 50 o'clock, think that then eyes are within the focal range of the minute surface 20-30cm of cold mirror 511, detect initial pupil center coordinate again and whether be in the picture centre position, be the initial coordinate (x of pupil center, y) satisfy condition: 200≤x≤440,150≤y≤330;
5) if any one condition does not satisfy described in the step 4), then by red LED always flash for prompting continued to adjust front and back position by the picker, and picture centre position, initial pupil center place, if satisfy the condition of step 4), computing machine 514 rotates and changes the state of LED lamp 510 for the control step motor 52 that sends instructions of the control circuit in the electric-controlled box 53, and red LED can stop flicker and luminously always watch camera lens attentively and keep motionless to show by the picker;
6) stepper motor 52 moves forward by leading screw 54 drive travelling tables 55, the eye image that digital camera 57 is gathered a series of different focal planes carries out that picture quality is flat explains archaic or dialectal words in current language: select a fixed area on the eye image, whole graded is asked in this piece zone on every two field picture, and the image of getting a graded maximum at last is defined as top-quality iris image;
7) computing machine 514 sends instructions for control circuit in the electric-controlled box 53 and makes the green LED flicker after obtaining top-quality iris image, shows to gather to finish that the user can leave harvester; And the counter-rotating of electric-controlled box 53 control step motors 52 makes travelling table 55 return to initial position, and green LED is luminous but stop flicker, and device is waited for next time and being gathered.
Present embodiment also can further be filled the zone in the initial pupil, the illumination hot spot that is about in the pupil is filled to black, again carry out distribution statistics according to step 3) again to gray-scale value, find grey value profile minimum a bit, and in conjunction with the edge detection calculation of pupil go out up and down and about four radiuses, average according to these four radiuses and again pupil center to be revised; Utilize the Hough conversion to obtain the centre coordinate and the radius parameter of the cylindrical of iris then; According to the radius of pupil and iris cylindrical and centre coordinate parameter the external diameter of iris is all cut away the pupil of iris inside and other outside image the iris image of remaining image section for tentatively splitting.
The iris image that present embodiment is gathered as shown in Figure 7, the iris image sharpness is than higher, the texture of iris region 71 is all very clear.Present embodiment is further cut apart automatically to iris region, has been partitioned into the image 81 of iris region comparatively exactly, as shown in Figure 8, can satisfy the requirement of real-time identifying system to image acquisition.
Claims (4)
1, a kind of living body iris image-pickup method comprises that eye position detects and two parts of image quality measure; Specifically may further comprise the steps:
1) adjustment is made its eyes be in camera within sweep of the eye by picker's front and back position, and camera constantly transmits the dynamic image that collects;
2) when dynamic image when secretly brightening, in entire image, sample, if the gray-scale value of center section image is lower than the gray-scale value of image on every side, then confirming as is eye image;
3) statistics eye image gray-scale value finds gray-scale value lowermost extent central point, and this point is set at initial pupil center;
4) set the gray difference threshold of an eye image and the Grads threshold of gray scale, from this initial pupil center up and down about four sides carry out rim detection, and satisfy following three conditions: detect the gray difference threshold of gray scale difference greater than described setting; The Grad that detects gray scale surpasses the Grads threshold of the gray scale of described setting, detects initial pupil center coordinate again and whether is in the picture centre position;
5) if any one condition does not satisfy described in the step 4), then point out and continue to adjust by picker's front and back position by the ungratified cue of expression condition, all satisfy up to described three conditions, then the signal that begins to gather by expression is pointed out by the picker and is watched camera lens attentively and keep motionless;
6) automatic dollying head before and after, the eye image of gathering a series of different focal planes carries out image quality measure, determines top-quality iris image.
2, living body iris image-pickup method as claimed in claim 1, it is characterized in that, the concrete grammar of described image quality measure is: select a fixed area on the eye image, whole graded is asked in this piece zone on every two field picture, and the image-region of getting a graded maximum at last is defined as top-quality iris image;
3, living body iris image-pickup method as claimed in claim 1 or 2 is characterized in that, also further comprises the 6th) iris image that obtains of step cuts apart, and obtains iris image; The concrete grammar of cutting apart is: will be filled to black according to the illumination hot spot in the pupil region that the edge marked off of pupil, again according to the distribution statistics that carries out again gray-scale value, find grey value profile minimum a bit, and in conjunction with the edge detection calculation of pupil go out up and down and about four radiuses, average according to these four radiuses, obtain the final radius of pupil; Utilize hough transform to obtain the centre coordinate and the radius of the cylindrical of iris then; Radius and centre coordinate according to pupil and iris cylindrical all cut away the pupil of iris inside and other outside image the iris image of remaining image section for tentatively splitting.
4, a kind of living body iris image collecting device, comprise a base, be installed in one dimension travelling table and drive motor thereof on this base, cue device of on this travelling table, installing and CCD camera, and the computing machine that is connected with the CCD camera, eye position is housed in this computing machine detects and the image quality measure module; A plurality of infraluminescence pipes that distributing equably on every side of the camera lens of this CCD camera, cold mirror is equipped with in camera lens the place ahead of this CCD camera, and this cold mirror adopts visible light to be reflected the optical filter that the part infrared light can pass through; Control circuit and the power supply that is connected with computing machine is installed in the worktable rear end, and this computing machine sends instructions and comes the Control work platform to move forward and backward and change the duty of display device.
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| EP0910986A1 (en) * | 1997-10-24 | 1999-04-28 | BRITISH TELECOMMUNICATIONS public limited company | Imaging apparatus |
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2004
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