CN202548864U - Palm print acquisition device - Google Patents
Palm print acquisition device Download PDFInfo
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- CN202548864U CN202548864U CN2012201787650U CN201220178765U CN202548864U CN 202548864 U CN202548864 U CN 202548864U CN 2012201787650 U CN2012201787650 U CN 2012201787650U CN 201220178765 U CN201220178765 U CN 201220178765U CN 202548864 U CN202548864 U CN 202548864U
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Abstract
The utility model discloses a palm print acquisition device, which comprises a box body, wherein the top of the box body is provided with a transparent acquisition window; the other parts of the box body are in a nontransparent state; an annular light source and an image acquisition device are distributed in the box body; the annular light source is positioned below the acquisition window and surrounds the periphery of the acquisition window; a light emergent surface of the annular light source faces the acquisition window; and the image acquisition device is positioned below the annular light source, and a palm print image is acquired by the acquisition window and is transmitted to an image processor. According to the palm print acquisition device, by adoption of mechanical structural design, the whole acquisition environment is positioned in a semi-closed state, and the other parts on the equipment box body are in a closed state except the acquisition window and an outlet of a power line, so that the outside light can be reduced, the influence of the outside light on the acquisition environment is avoided, and the external interference is reduced; and meanwhile, a coating capable of absorbing light rays is sprayed on the inner side of the box body, so that a light reflection image inside the box body can be reduced, and the imaging quality is improved.
Description
Technical field
The utility model belongs to the Palm Print Recognition System technical field, specifically, relates to a kind of palmmprint collecting device that is used to obtain palmprint image.
Background technology
The palmmprint recognition technology is the emerging technology of living things feature recognition and field of medical applications.Palmmprint has uniqueness, and people's palm varies, and does not have two people's palm identical.The palmmprint area is bigger, the abundant information that comprises and have the property distinguished preferably, the palmmprint principal character stable and also obviously, be difficult for advantage such as imitations and make palmmprint in living things feature recognition and the application of medical science auxiliary diagnosis, have sizable advantage.
Palm Print Recognition System accounts for very little part in the application of whole biological recognition system and medical domain, suitable Palm Print Recognition System still less.At present; Domestic civilian and Palm Print Recognition System application market suitable its application almost is blank, so development low price, volume is little, the construction cycle is short, easy to maintenance Palm Print Recognition System are popularized being a research topic highly significant at civil area.
For Palm Print Recognition System, obtaining of palmprint image is crucial step, and this is the basis of subsequent treatment, and the collection effect of palmprint image will directly have influence on reliability, accuracy and the generalization of palm grain identification method.At present, the difficulty that is run on the palm-print image capture is one of bottleneck of restriction palmmprint recognition technology development always.If palmprint image can not be clear, gather easily, the palmmprint recognition technology has not just been known where to begin yet so.Therefore, the collection difficulty of palmprint image is to cause very The key factor of Palm Print Recognition System performance low at present.
Summary of the invention
The purpose of the utility model is to provide a kind of palmmprint collector that is applicable to human palm, to improve the acquisition quality of palmprint image.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of palmmprint collector comprises casing, and the end face of casing is provided with transparent collection window, and all the other positions of casing are non-transparent state; In said casing, be laid with annular light source and image acquisition device, said annular light source is positioned at the below of gathering window, and is looped around the periphery of gathering window, and the exiting surface of annular light source is towards described collection window; Said image acquisition device is positioned at the below of annular light source, absorbs palmprint image through gathering window, and transfers to image processor.
Preferably; Said image processor is a panel computer; Form a screen window at box top; Said panel computer is installed, and the display screen of panel computer just is assembled in the described screen window below said screen window, and makes casing be non-transparent state at this position through said panel computer.
Further, said image acquisition device is an industrial camera, connects described image processor, receives the steering order that image processor sends on the one hand, takes palmprint image to start; The palmprint image that will absorb on the other hand is sent to image processor and handles, with the level identification of convenient back; The center of said annular light source should be on the line of the optical center of said industrial camera, so that offer the even and stable illumination condition of camera.
Further again; The view field that said transparent collection window projects to plane, annular light source place just is positioned at the centre position that annular light source surrounds the zone; So that light can illuminate uniformly the palm area that will gather, and then improve the collection effect of palmprint image.
Preferably, said annular light source is arranged by a plurality of White LEDs parallel with one another on circuit and is formed; A plurality of described White LEDs are evenly distributed around forming oval-shaped annular light source, and perhaps symmetry arrangement is around the annular light source that forms rectangle; The power supply terminal of said annular light source connects the power module that is laid in the casing, and said power module connects power lead, and said power lead is drawn out to the casing outside via the through hole of offering on the casing, to connect external power source.
Further again, the 8mm tight shot is installed on said industrial camera, on said tight shot, polariscope is installed, the distance between the camera lens of said industrial camera and the transparent collection window is between 35cm to 45cm.
For position, the size that guarantees each palmprint image of gathering do not have too big difference, the position protrusion that on said casing, closes on said transparent collection window is provided with two and is respectively applied for the reference column that props up left finesse flex point or right finesse flex point.
Preferably, said transparent collection window is preferably rectangular, and long limit size is between 15cm to 20cm, and the broadside size all can be placed on completion palmmprint acquisition tasks on the collection window to be fit to all adult palms between 10cm to 15cm; Wherein, two described reference columns can be laid in the side that rectangle is gathered a wherein broadside of window symmetrically, to be used for the location of left and right sides palm.
Further, three layers of nontransparent baffle plate are arranged, be respectively applied for from top to bottom and carry described image processor, annular light source and image acquisition device in the set inside of said casing; All offer a window on the two-layer baffle plate above being positioned at; The size of said window and transparent collection window measure-alike; And on said two-layer baffle plate to offer the position consistent with the vertical projection zone of transparent collection window on this baffle plate so that image acquisition device can photograph the palm that is placed on the transparent collection window through described window.
In order to make the background of taking the palm image that forms is black, to make things convenient for subsequent image processing, a light shield is installed on said casing, and said light shield is positioned at the top of transparent collection window; All be coated with light-absorbing coating at the inside surface of said light shield and the inside surface of casing,, reflect the interference that causes with effective reduction light such as blackwash.
Compared with prior art; The advantage and the good effect of the utility model are: the palmmprint collector of the utility model adopts Design of Mechanical Structure, and whole collection environment is in semi-closed state, except gathering the outlet of window and power lead, is air-tight state on the equipment box; Can reduce the outside like this and advance light; Avoid extraneous light to gathering the influence of environment, reduce external interference, improve image quality.This palmmprint acquisition system has guaranteed the consistance of acquisition condition, has reached the standardization requirement as far as possible, has significantly improved the collection effect of palmprint image.
After the detailed description in conjunction with advantages the utility model embodiment, other characteristics of the utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of a kind of embodiment of the palmmprint collector that proposes of the utility model;
Fig. 2 is the schematic layout pattern of a kind of embodiment of box top among Fig. 1;
Fig. 3 is the schematic layout pattern on the ground floor baffle plate among Fig. 1;
Fig. 4 is the schematic layout pattern on the second layer baffle plate among Fig. 1;
Fig. 5 is the schematic layout pattern on the 3rd layer of baffle plate among Fig. 1.
Embodiment
Describe in detail below in conjunction with the embodiment of accompanying drawing the utility model.
Embodiment one, and referring to shown in Figure 1, the palmmprint collector of present embodiment mainly partly is made up of casing, annular light source, image acquisition device and image processor etc.Wherein, be provided with transparent collection window 6 at the end face 1 of said casing, said transparent collection window 6 can be offered acquisition window through the end face 1 at casing, and the mode that transparent panel is installed on acquisition window designs formation.Too much be injected into box house for fear of external environment light; Acquisition quality to palmprint image causes adverse effect; Present embodiment preferably is designed to non-transparent state with all the other positions of casing, so that whole collection environment is under a kind of semi-enclosed situation, to reduce external interference.In said casing, lay annular light source and image acquisition device, said annular light source is set in place in the below of gathering window 6, and from relative position, should be looped around the periphery of gathering window 6.Let the exiting surface of annular light source towards described collection window 6, be used to illuminate and be placed on the palm of gathering on the window 6, so that image acquisition device picked-up palmprint image.Said image acquisition device is arranged on the below of annular light source, through gathering window picked-up palmprint image, and transfers to image processor and handle.Said image processor can be used for the duty of image acquisition device is controlled simultaneously, both can be arranged on box house, also can be arranged on the casing outside.As a kind of preferred design of present embodiment, preferably said image processor is built in the described casing, to be integrally formed the formula structure, conveniently to use and put.
In the present embodiment, said image processor preferably adopts a panel computer to connect described image acquisition device, accomplishes the control of image acquisition device and the Processing tasks of palmprint image.Specifically, can offer a screen window 7, described panel computer is installed below screen window 7 at the end face 1 of said casing, as shown in Figure 1.7 are injected into box house for fear of extraneous light from screen window, influence the collection environment of image, and present embodiment is preferably offered described screen window 7 according to the front panel size of panel computer.The display screen of panel computer is installed over against described screen window 7, and then made casing be non-transparent state at this position through described panel computer.
For said panel computer is played a supporting role, can also a baffle plate be installed at said box house, like the ground floor baffle plate 2 among Fig. 1, to make things convenient for the installation of panel computer in casing.Formed space between ground floor baffle plate 2 and the box top 1 is referred to as ground floor space 8 in the case, is used for installing and laying panel computer.Fig. 3 is the installation position synoptic diagram of ground floor baffle plate 2, and wherein, regional A is that panel computer is laid the district, according to gathering the installation position of window 6 at box top 1, can select to be laid in the left side or the right side of ground floor baffle plate 2.That is, when collection window 6 is laid in the left side of box top 1, can screen window 7 be opened in the right side of box top 1,, correspondingly panel computer be laid in the right side of ground floor baffle plate 2 referring to shown in Figure 2; When collection window 6 is laid in the right side of box top 1, then can screen window 7 be opened in the left side of box top 1, correspondingly panel computer is laid in the left side of ground floor baffle plate 2.Shine on the collection window 6 in order to make the light that annular light source sent that is positioned at ground floor baffle plate 2 belows pass described ground floor baffle plate 2; And make the image acquisition device that is positioned at ground floor baffle plate 2 belows can pass described ground floor baffle plate 2 and absorb palmprint image; Need on said ground floor baffle plate 2, offer a window 12; As shown in Figure 3; The size of said window 12 should with the consistent size of gathering window 6, and the position of offering on ground floor baffle plate 2 should be just vertically opposite with the position of gathering window 6, promptly with to gather the vertical projection zone of window 6 on ground floor baffle plate 2 consistent.
Annular light source and the image acquisition device laying in casing for ease; Preferably two-layer baffle plate is set again at box house; Be second layer baffle plate 3 and the 3rd layer of baffle plate 4; As shown in Figure 1, form second space 9 and interior the 3rd space 10 of case in the case respectively, with corresponding described annular light source and the image acquisition device laid of difference.Specifically, can annular light source 13 be laid on the second layer baffle plate 3, as shown in Figure 4.The a plurality of White LEDs of said annular light source 13 preferred employings are arranged and are formed, such as being arranged in oval or rectangle etc.In the zone line that said annular light source 13 is surrounded, offer window 14; The size of said window 14 should with the consistent size of gathering window 6; And the position of offering on second layer baffle plate 2 should be just vertically opposite with the position of gathering window 6; Promptly consistent with the vertical projection zone of collection window 6 on second layer baffle plate 2, so that be installed in the 3rd layer of image acquisition device on the baffle plate 4 successively through the palmprint image on the transparent collection window 6 of 12 picked-ups of the window on window on the second layer baffle plate 3 14 and the ground floor baffle plate 2.
For make the light that sends through annular light source 13 can illuminate equably on the transparent collection window 6 the palm area that will gather; And then the collection effect of raising palmprint image; Preferably described a plurality of White LEDs are evenly arranged, form oval-shaped annular light source such as evenly distributed centering on.When needs are designed to the annular light source of rectangle, can be with described a plurality of White LED symmetry arrangement, promptly the White LED on both sides symmetry is laid relatively, and is as shown in Figure 4, to form uniform surround, for image capture device provides even and stable illumination condition.In addition, when the described loop wire light source 13 of design, should make ring light and palm surface be very little incident angle as far as possible, can give prominence to the breach and the convexity of tested palmmprint like this, the image quality of raising palmmprint.
In the present embodiment, described a plurality of White LEDs are the preferred parallel way that adopts on circuit, to avoid causing extinguishing of full annular light source 13 owing to burning of a LED.In order stable working power to be provided to described annular light source 13, in described casing, also power module need be set further, specifically can be placed in the 3rd layer of baffle plate 4 and tank floor 5 formed the 4th spaces 11, as shown in Figure 1.In described power module, transformer can be set, connect power lead, described power lead is drawn out to the casing outside via the through hole of offering on the casing, to connect external power source, such as the electric main of 220V.Through transformer the electric main decompression transformation of 220V being become low-voltage alternating current power supply, through the power supply terminal of cable transmission to annular light source 13, is annular light source 13 power supplies.Certainly; For the annular light source that needs direct current supply 13; Also rectifying and voltage-stabilizing voltage need be set further in power module; To be used for that the low-voltage alternating current power supply rectifying conversion of transformer output is become the galvanic current source, through cable transmission to annular light source 13, to satisfy the need for electricity of annular light source 13.In addition, also need further offer wire hole 15,16,, be connected on the power supply terminal of annular light source 13 so that the cable of connection power module can pass described wire hole 15,16 like Fig. 4, shown in Figure 5 at second layer baffle plate 3 and the 3rd layer of baffle plate 4.
Power lead for panel computer also can extend into the 4th space 11 through described wire hole 15,16, and then is drawn out to the casing outside through the through hole of offering on the casing, connects external power source.
For image acquisition device, present embodiment preferably adopts an industrial camera to absorb palmprint image.As a kind of preferred design, said industrial camera preferably adopts a CMOS industrial camera, adopts USB2.0 output, Pixel Dimensions 5.2um*5.2um, and resolution 1280*1024, parameters such as control time shutter able to programme, brightness, gain, power consumption is little.The 8mm tight shot of C mouth is installed on camera, 46 ° of field angle, and the polariscope of a C mouth is installed on camera lens, and incident light is carried out polarization, avoid image to cross the formation of bright or hot spot.Because annular light source 13 is centered around the top of camera lens, direction of illumination is towards gathering window 6, and its illumination is a frontlighting to camera lens, thereby can prevent like this that light source from shining directly into forms hot spot and influence image quality in the camera lens.
In order to satisfy photographing request, for the tight shot of 8mm, needs assurance camera lens in the scope of 35cm to 45cm, is preferably designed to the spacing of 40cm, so that shoot palmprint image clearly to the distance between the collection window 6.Certainly; For the tight shot that adopts other specifications; Then can be according to the Gaussian optics principle:
with
(wherein;
is respectively the height of imaging, the height of actual object;
is respectively focal length; Image distance; Object distance); Determine camera lens to the distance of gathering between the window 6 according to the key elements such as focal length of hand sizes, industrial camera, to satisfy the photographing request of palmprint image, present embodiment does not specifically limit this.
The palmprint image that photographs through industrial camera 17 can transfer to panel computer via the usb signal line, utilizes panel computer to carry out pre-service, analysis and the storage of image.Simultaneously, through said usb signal line, panel computer can also send steering order to industrial camera 17, such as the instruction etc. of the instruction that begins to take, adjustment lens parameters, with the duty of control industrial camera 17.For the required working power of industrial camera 17, also can from panel computer, extract, and then satisfy the need for electricity of industrial camera 17 via the usb signal line.Described usb signal line can be connected on the panel computer via wire hole 15 equally.
For described transparent collection window 6, can on box top 1, determine a rectangle frame that is of moderate size according to the size and the shape of adult's palm, i.e. acquisition window, the transparent panel that a rectangle is installed then forms described transparent collection window 6.As a kind of preferred design, the long limit size that can design said transparent collection window 6 is between 15cm to 20cm, and the broadside size is preferably designed to the rectangular window of 18cm*10cm between 10cm to 15cm, to be fit to all adult palms.Carrying out palmmprint when gathering, palm is placed on the transparent collection window 6, the centre of the palm down, conveniently to obtain palmprint image.For position, the size of the palmprint image that guarantees to collect do not have too big difference at every turn; The position protrusion that closes on said transparent collection window 6 at said box top 1 is provided with two reference columns 18,19; Preferred cloth is located at the side that rectangle is gathered a wherein broadside of window 6; And left-right symmetric is laid, and is as shown in Figure 1.When gathering right hand palmmprint, the flex point of right hand wrist is propped up the pillar 18 on the left side; When gathering the left hand palmmprint, the flex point of left hand wrist is propped up the pillar 19 on the right, all drop in the rectangle frame to guarantee whole palm area.For guaranteeing the thenar area territory clean mark of palm, palm was wanted to open naturally when palmmprint was gathered, and thumb will be drawn close to centre of the palm direction a little, makes the thenar area territory be in relaxation state.
In order to make the background black in color of the palmprint image of shooting; To make things convenient for subsequent image processing and identification, present embodiment is preferably further installed a light shield at the end face 1 of casing, is positioned at the top of gathering window 6; The keyboard cover of installing on the similar ATM cash dispenser is such, to block extraneous light.The inside surface of the inside surface of light shield, casing and each layer baffle plate are all sprayed can light-absorbing black (can certainly spray other can light-absorbing coating); With the interference of the reflective and extraneous light that reduces box house, thereby improve image quality to the camera lens imaging.
The installation site of each layer baffle plate 2,3,4 in casing can be adjusted by easy on and off, so that also prepare for casing expansion in the future in the position of adjustment light source and camera lens.
The palmmprint collector of present embodiment preferably adopts aluminum alloy materials to make described casing, and is not only light firm, but also can gather facility to inside good protection is provided.Window 6 and power lead outlet are to be airtight except that gathering on the casing, can reduce the outside like this and advance light, the reduction external interference.Light source adopts annular light source, can form uniform surround, strengthens palmmprint gully shade, improves the picked-up quality of palmmprint lines.The employing of Techno-Industrial camera, improved equipment to external world environment such as the adaptive faculty of temperature, humidity.The camera external trigger is convenient to control, and can control parameters such as exposure, brightness.The output interface data rate of USB2.0 is fast, also is convenient to be connected with panel computer.Adopt tight shot rather than zoom lens, focusing speed is fast, and image quality is stable and accurate, suits very much the collecting device needs.Through panel computer friendly human-computer interaction interface is provided, when being convenient to control camera parameter, can also the real-time palmprint image of preview.
Certainly; The above only is a kind of preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (10)
1. palmmprint collector, it is characterized in that: comprise casing, the end face of casing is provided with transparent collection window, and all the other positions of casing are non-transparent state; In said casing, be laid with annular light source and image acquisition device, said annular light source is positioned at the below of gathering window, and is looped around the periphery of gathering window, and the exiting surface of annular light source is towards described collection window; Said image acquisition device is positioned at the below of annular light source, absorbs palmprint image through gathering window, and transfers to image processor.
2. palmmprint collector according to claim 1; It is characterized in that: said image processor is a panel computer; Form a screen window at box top; Said panel computer is installed, and the display screen of panel computer just is assembled in the described screen window below said screen window, and makes casing be non-transparent state at this position through said panel computer.
3. palmmprint collector according to claim 1 is characterized in that: said image acquisition device is an industrial camera, connects described image processor; The center of said annular light source is on the line of the optical center of said industrial camera.
4. palmmprint collector according to claim 3 is characterized in that: the view field that said transparent collection window projects to plane, annular light source place just is positioned at the centre position that annular light source surrounds the zone.
5. palmmprint collector according to claim 3 is characterized in that: said annular light source is arranged by a plurality of White LEDs parallel with one another on circuit and is formed; A plurality of described White LEDs are evenly distributed around forming oval-shaped annular light source, and perhaps symmetry arrangement is around the annular light source that forms rectangle; The power supply terminal of said annular light source connects the power module that is laid in the casing, and said power module connects power lead, and said power lead is drawn out to the casing outside via the through hole of offering on the casing.
6. palmmprint collector according to claim 3; It is characterized in that: the 8mm tight shot is installed on said industrial camera; On said tight shot, polariscope is installed, the distance between the camera lens of said industrial camera and the transparent collection window is between 35cm to 45cm.
7. according to each described palmmprint collector in the claim 1 to 6, it is characterized in that: the position protrusion that on said casing, closes on said transparent collection window is provided with two and is respectively applied for the reference column that props up left finesse flex point or right finesse flex point.
8. palmmprint collector according to claim 7 is characterized in that: said transparent collection window is rectangular, and long limit size is between 15cm to 20cm, and the broadside size is between 10cm to 15cm; Two described reference columns are laid in the side that rectangle is gathered a wherein broadside of window symmetrically.
9. according to each described palmmprint collector in the claim 1 to 6, it is characterized in that: the set inside at said casing has three layers of nontransparent baffle plate, is respectively applied for from top to bottom to carry described image processor, annular light source and image acquisition device; All offer a window on the two-layer baffle plate above being positioned at, the size of said window and transparent collection window measure-alike, and on said two-layer baffle plate to offer the position consistent with the vertical projection zone of transparent collection window on this baffle plate.
10. according to each described palmmprint collector in the claim 1 to 6, it is characterized in that: a light shield is installed on said casing, and said light shield is positioned at the top of transparent collection window; All be coated with light-absorbing coating at the inside surface of said light shield and the inside surface of casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201787650U CN202548864U (en) | 2011-09-02 | 2012-04-25 | Palm print acquisition device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120337066.1 | 2011-09-02 | ||
| CN201120337066 | 2011-09-02 | ||
| CN2012201787650U CN202548864U (en) | 2011-09-02 | 2012-04-25 | Palm print acquisition device |
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| CN202548864U true CN202548864U (en) | 2012-11-21 |
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| CN2012201787650U Expired - Fee Related CN202548864U (en) | 2011-09-02 | 2012-04-25 | Palm print acquisition device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014778A (en) * | 2017-05-08 | 2017-08-04 | 浙江理工大学 | A kind of desk-top near-infrared probe device |
| CN107844738A (en) * | 2016-09-20 | 2018-03-27 | 中控智慧科技股份有限公司 | Palm characteristic image harvester |
-
2012
- 2012-04-25 CN CN2012201787650U patent/CN202548864U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107844738A (en) * | 2016-09-20 | 2018-03-27 | 中控智慧科技股份有限公司 | Palm characteristic image harvester |
| CN107844738B (en) * | 2016-09-20 | 2020-05-12 | 中控智慧科技股份有限公司 | Palm characteristic image acquisition device |
| CN107014778A (en) * | 2017-05-08 | 2017-08-04 | 浙江理工大学 | A kind of desk-top near-infrared probe device |
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Granted publication date: 20121121 Termination date: 20130425 |