CN2684278Y - Scan imaging living body palm print collecting instrument having USB interface - Google Patents
Scan imaging living body palm print collecting instrument having USB interface Download PDFInfo
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- CN2684278Y CN2684278Y CN 200320101990 CN200320101990U CN2684278Y CN 2684278 Y CN2684278 Y CN 2684278Y CN 200320101990 CN200320101990 CN 200320101990 CN 200320101990 U CN200320101990 U CN 200320101990U CN 2684278 Y CN2684278 Y CN 2684278Y
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Abstract
The utility model discloses a scanning imaging living body palm print collecting instrument with a USB interface, the structure of which is composed of an optical imaging part, an optical element seat, a scanning collecting part, a USB interface circuit, a light source, a USB interface keyboard, an electrical source and a bottom board. The utility model adopts a CCD linear array scanning principle, uniform light irradiation is formed in the optical imaging part through the nonuniform light source, and an image of palm prints is generated by an optical imaging element; after the image of the palm prints is obtained by a CCD linear array subassembly, the utility model adopts a mechanical structure similar to a universal scanner to carry out scanning, and the image of the palm prints which is satisfied with operating requirements is obtained utilizing a linear scanning imaging principle. The utility model adopts a CCD linear array scanning scheme, can use a general CCD linear array element with low cost and a lens with a small caliber, and the design and the manufacture of the utility model are totally and comparatively easy; under the coordination of the scanning mechanical structure, the problems of optical imaging distortion correction can be effectively solved, and the integral cost has a great drop.
Description
Technical field
The utility model relates to a kind of live body palmmprint Acquisition Instrument, relates in particular to a kind of scanning imagery live body palmmprint Acquisition Instrument with USB interface, can be widely used in computing machine palmmprint identification field.
Background technology
Fingerprint imaging technology commonly used at present generally adopts CCD face array element part or CMOS face array element part.The good imaging quality of CCD face array element part, but compare with CMOS face array element part, integrated level is lower, and power consumption is bigger.Then than CCD face array element part integrated level height, power consumption is low for CMOS face array element part, but image quality is poor slightly.Because the acquisition window area of fingerprint collecting equipment is smaller, under the requirement of standard resolution, the total pixel number of opposite array element part is less demanding, so the two all is widely used in computer fingerprint identification field.But for the palmmprint collecting device, because the acquisition window area that requires is relatively big, according to the desired resolution of GB is per inch 500dpi, if adopt CCD/CMOS face array element part, then very high to the requirement of the total pixel number of CCD/CMOS face array element part, very rareness is very expensive again to satisfy the components and parts of this requirement.The CCD face array element part that generally is used for digital camera, though its nominal pixel count is higher, but this is the summation of whole color images prime numbers, its filtergram prime number still not high enough (collection of fingerprint or palmmprint need be used include monochrome pixels), and length breadth ratio is also different with palmmprint acquisition window length breadth ratio, is not suitable for using; On the other hand, in case international standard is carried out the resolution requirement (U.S. FBI is using) of per inch 1000dpi, the CCD face array element part that then will not have to meet the demands in relatively long period uses, in case this means that also new national standard enables, can't continue to continue to use original technical scheme and develop new product, it is out of stock that subsequent product is occurred.Because the economic support ability is stronger, can adopt the technical scheme similar with fingerprint collecting abroad, promptly adopt the CCD face array element part of extremely expensive high pixel count, can realize the collection to palmmprint, its shortcoming is that price is too high, and domestic consumer is difficult to accept.
Traditional scanning imaging technology is very ripe now, be widely used in the general scanner, its ultimate principle as shown in Figure 1, piece image can be thought to be made up of some parallel lines, and a line 9 wherein is imaged on the CCD linear array element 11 by optical lens 10, when optical lens 10 and CCD linear array element 11 move according to the direction of scanning shown in the figure, can obtain all lines line by line, handle by some general digital circuits then, can obtain entire image.But well-known is directly to utilize the imaging system of scanner can not obtain palmprint image, even add that simply imaging system also can run into high resolving power and require a series of particular problems such as sweep velocity is slow down, image quality is relatively poor, distortion is big.
Summary of the invention
In order to overcome the defective of above-mentioned prior art, the purpose of this utility model provides a kind of live body palmmprint Acquisition Instrument with USB interface of the CCD of employing linear array scanning technology.
To achieve these goals, the utility model is by the following technical solutions: a kind of scanning imagery live body palmmprint Acquisition Instrument with USB interface, and its structure mainly comprises optical imagery part, optical element seat, scanning collection car, data processing circuit, scanning motion assembly, usb circuit, light source, USB interface keyboard, power supply and base plate;
Described optical imagery partly be installed in described optical element seat above, described optical element seat is installed on the described base plate; What described scanning motion assembly tilted is fixed on the described base plate, and the angle of its inclination can make track while scan parallel with the optical imagery face; Described scanning collection car combines with described scanning motion assembly; Described data processing circuit and described usb circuit are fixed on the base of described scanning motion assembly, and described light source and described USB interface keyboard are installed on the described optical element seat, and described power supply is installed on the described base plate;
Described data processing circuit and described scanning collection car, scanning motion assembly, usb circuit and light source link respectively; Described power supply and data processing circuit, scanning motion assembly, light source and USB interface keyboard link respectively.
The structure of described scanning collection car mainly comprises car body, plane mirror, optical lens and CCD linear array assembly.
The structure of described scanning motion assembly mainly comprises stepper motor, gear set, flute profile belt, slide bar, base, fixedly wheel shaft and stepper motor seat; Stepper motor and gear set are fixed by the stepper motor seat, and an end of flute profile belt is fixed by the stepper motor seat, and the other end of flute profile belt is fixed by fixing wheel shaft.
The car body of described scanning collection car combines with the flute profile belt and the slide bar of scanning motion assembly.
Described scanning motion assembly scans according to formula S=k*R*sin per inch that (180-alpha-beta)/sin α+m calculates scanning step number;
Per inch operation step number when the S in the formula is scanning;
R is a resolution, i.e. the dpi number;
α is an optical imagery part drift angle angle, and span is between 30 degree ~ 90 degree;
β is the angle that optical imagery face and palmmprint are gathered face, is determined by glass refraction and optical wavelength;
K is a correction coefficient, and its value is selected between 0.99 ~ 1.01 according to the distortion correction situation;
M is a modifying factor, its value according to the distortion correction situation-R/50 ~+select between the R/50.
Because the utility model has adopted above technical scheme, so have the following advantages:
1) the utility model not only reaches external technical merit fully on image quality, resolution, and on the acquisition window area, be not less than external product, satisfy the requirement that palmmprint is gathered fully, filled up the blank of domestic prior art, solved the special product that public security system is badly in need of;
2) easy for installation, only connect with computing machine and can finish the hardware installation by USB cable;
3) soft, hardware environment adaptability is strong, owing to adopted the USB standard extensively supported of being subjected to, does not need extra accessory, the desk-top computer of standard configuration and notebook computer all can connect with it, work;
4) owing to can use common at a low price CCD linear array element, and need not use the CCD face array element part of extremely expensive very-high solution, thereby greatly reduce system cost, subsequent product Primary Component problem out of stock can not occur, on resolution, be easy to upgrade yet to satisfy the requirement of international standard of future generation;
5) compare with using CCD face battle array scheme, adopt CCD linear array scanning scheme can use the less camera lens of bore, its design, manufacturing are all than being easier to, the image deformation of camera lens itself is easy to correct, on the mirror image interference problem of getting rid of the optical imagery part, also more favourable, on whole cost, reduce significantly, be easy to apply.
Description of drawings
Fig. 1 is the scanning imagery principle schematic of existing scanner;
Fig. 2 is a structural principle block diagram of the present utility model;
Fig. 3 is the structural principle block diagram of the utility model embodiment;
Fig. 4 is the mounting structure schematic top plan view of the utility model embodiment;
Fig. 5 looks synoptic diagram for the mounting structure right side of the utility model embodiment;
Fig. 6 is the synoptic diagram of scanning collection bassinet structure form one of the present utility model;
Fig. 7 is the synoptic diagram of scanning collection bassinet structure form two of the present utility model;
Fig. 8 is the synoptic diagram of scanning collection bassinet structure form three of the present utility model;
Fig. 9 is the synoptic diagram of scanning collection bassinet structure form four of the present utility model;
Figure 10 is the structural representation of scanning motion assembly of the present utility model;
Figure 11 is the electrical block diagram of the utility model light source;
Figure 12 is a per inch scanning step number computing formula synoptic diagram of the present utility model.
Below in conjunction with accompanying drawing, the description by to embodiment further specifies the utility model.
Embodiment
The utility model has adopted and the diverse technology path of traditional C CD/CMOS face battle array technology, promptly adopted CCD linear array scanning principle, irradiation by light source, produce the image of palmmprint by the optical imagery element, by camera lens image is incident upon on the CCD linear array element, adopt the physical construction similar to scan, utilize the linear array scanning image-forming principle to obtain the palmprint image that satisfies request for utilization to the universal scan instrument.
As Fig. 2, shown in Figure 3, structure of the present utility model mainly comprises optical imagery part 1, scanning collection car 21, data processing circuit 22, scanning motion assembly 23, usb circuit 3, light source 4, USB interface keyboard 5 and power supply 6.Wherein scanning collection car 21, data processing circuit 22 and scanning motion assembly 23 constitute scanning collection part 2.Data processing circuit 22 connects respectively with scanning collection car 21, scanning motion assembly 23, usb circuit 3 and light source 4; Power supply 6 connects respectively with data processing circuit 22, scanning motion assembly 23, light source 4 and USB interface keyboard 5.
Scanning collection part 2 main responsible optical images with palmmprint are converted to electric signal and gather, handle, export, and the signal of output is delivered to usb circuit 3.
As Fig. 4, shown in Figure 5, optical imagery part 1 be installed in optical element seat 7 above, optical element seat 7 is installed on the base plate 8, what scanning motion assembly 23 tilted is fixed on the base plate 8, the angle of its inclination can make track while scan parallel with the optical imagery face, so that realization parallel sweep, flute profile belt 233 in scanning collection car 21 and the scanning motion assembly 23, slide bar 234 combines, scanning collection car 21 can slided on slide bar 234 under the drive of flute profile belt 233, so that realization scanning motion, data processing circuit 22, usb circuit 3 is fixed on the base 235 of scanning motion assembly 23, light source 4 and USB interface keyboard 5 are installed on the optical element seat 7, and power supply 6 is installed on the base plate 8.
As shown in Figure 6, structure one form of scanning collection car 21 mainly comprises car body 211, plane mirror 212, optical lens 213 and CCD linear array assembly 214.Plane mirror 212 is reflected into optical lens 213 with the palmmprint image, image on the CCD linear array assembly 214 by optical lens 213, by CCD linear array assembly 214 output electric signal, above each element of car body 211 carrying also combines with flute profile belt 233, slide bar 234 in the scanning motion assembly 23, drive operation to realize scanning collection by it, this part structure can be formed by the transformation of existing universal scan instrument relevant portion, but the model of the parameter of the setting angle of its plane mirror 212, optical lens 213, CCD linear array assembly 214 etc. need be determined according to practical structures.
As Fig. 7, Fig. 8, shown in Figure 9, scanning collection car 21 can also have structure two, structure three, structure fourth class form, compares with structure one, and wherein structure two forms have increased plane mirror 215, can reduce the size of scanning collection car 21; Structure three forms have increased plane mirror 216, plane mirror 217, can reduce the size of complete machine; Structure four forms have not only increased plane mirror 215 but also increased plane mirror 216, plane mirror 217, therefore both can reduce the size of scanning collection car 21, can reduce the size of complete machine again.
As shown in figure 10, the structure of scanning motion assembly 23 mainly comprises stepper motor 231, gear set 232, flute profile belt 233, slide bar 234, base 235, fixedly wheel shaft 236 and stepper motor seat 237.Stepper motor seat 237 is used to install and fix stepper motor 231 and gear set 232; One end of flute profile belt 233 is fixing by stepper motor seat 237, and the other end of flute profile belt 233 is by fixedly wheel shaft 236 is fixing; Base 235 is used to install above-mentioned each parts.The instruction running that stepper motor 231 sends by data processing circuit 22, after gear set 232 decelerations, driving flute profile belt 233 rotates, because scanning collection car 21 is fixed on the flute profile belt 233, therefore when flute profile belt 233 rotates, can drive scanning collection car 21 and do linear movement on slide bar 234, its movement locus parallels with the optical imagery face, images acquired signal line by line in motion process.This part can be formed by the transformation of existing universal scan instrument relevant portion, but the length of the reduction gear ratio of the power of stepper motor 231 and rotating speed, gear set 232, flute profile belt 233 etc. need be determined according to practical structures.
As shown in figure 11, light source 4 is made up of on-off circuit 41, adjustment circuit 42, current-limiting resistance 43 and LED luminotron 44, and wherein current-limiting resistance 43 and LED luminotron 44 have some.Every current-limiting resistance 43 and some LED luminotrons 44 are formed one group, and whole light source 4 has some groups.Its course of work is: whether on-off circuit 41 is made decision power supply to be sent in the control of data processing circuit 22 and is adjusted circuit 42 and make light source 4 luminous, adjust the whole luminous intensity of circuit 42 decision light sources 4, the quantity of each group LED luminotron 44 and the resistance of current-limiting resistance 43 thereof determine the luminous intensity of this group, between some groups, be set at different luminous intensities as required, and the physical arrangement of LED luminotron 44 carried out suitable adjustment, just can form the non-homogeneous light source that suits the requirements.On-off circuit 41, adjustment circuit 42 all adopt known universal circuit, and current-limiting resistance 43 and LED luminotron 44 all adopt universal elements.
The process that employing the utility model carries out palmmprint scanning is as follows:
The solution of concrete technical matters is in the utility model:
1) because different glass materials has different refractive indexes, make its optical imagery face and palmmprint collection face have an angle, cause image trapezoidal distortion to occur, under the angle of inclination of adjusting mounting structure makes track while scan and situation that the optical imagery face parallels, adopt the parallel sweep method, solve image trapezoidal distortion problem.
2) adopt the per inch scanning step number of calculating by following formula to scan, solve image rectangle distortion problem.
S＝k*R*sin(180-α-β)/sinα+m
Per inch operation step number when the S in the formula is scanning;
R is a resolution, i.e. the dpi number;
α is an optical imagery part drift angle angle, and span is between 30 degree ~ 90 degree;
β is the angle that optical imagery face and palmmprint are gathered face, is determined by glass refraction and optical wavelength;
K is a correction coefficient, and its value is selected between 0.99 ~ 1.01 according to the distortion correction situation;
M is a modifying factor, its value according to the distortion correction situation-R/50 ~+select between the R/50.
(α angle and β angle can be referring to Figure 12, and wherein 1 is the optical imagery part)
3) adopt optimization associated components technical parameter to increase substantially picking rate.Usually can carry out appropriate design and optimization to the speed of stepper motor, the sensitivity of CCD linear array assembly, the parameter of optical lens, the intensity of light source etc., to realize requirement to high sweep velocity.
4) adopt non-homogeneous light source in the optical imagery part, to form even illumination.Owing to have complicated light folding, reflection in the optical imagery element, therefore when using uniform light source illumination, complicated light folding, reflection make image present non-homogeneous phenomenon on the contrary, have a strong impact on the palmmprint quality of image.Can utilize light source heterogeneous by the method for computer simulation or experiment,, comprehensively form uniform illumination, to increase substantially the palmmprint quality of image in conjunction with the folding of the light in the optical imagery element, reflection.
5) same because the interior complicated light catadioptric of optical imagery element can produce optical imagery mirror image interference problem.This can be by experiment, and the parameter of progressively revising the optical imagery element solves.
Claims (4)
1, a kind of scanning imagery live body palmmprint Acquisition Instrument with USB interface, it is characterized in that: its structure mainly comprises optical imagery part, optical element seat, scanning collection car, data processing circuit, scanning motion assembly, usb circuit, light source, USB interface keyboard, power supply and base plate;
Described optical imagery partly be installed in described optical element seat above, described optical element seat is installed on the described base plate; What described scanning motion assembly tilted is fixed on the described base plate, and the angle of its inclination can make track while scan parallel with the optical imagery face; Described scanning collection car combines with described scanning motion assembly; Described data processing circuit and described usb circuit are fixed on the base of described scanning motion assembly, and described light source and described USB interface keyboard are installed on the described optical element seat, and described power supply is installed on the described base plate;
Described data processing circuit and described scanning collection car, scanning motion assembly, usb circuit and light source link respectively; Described power supply and data processing circuit, scanning motion assembly, light source and USB interface keyboard link respectively.
2, the scanning imagery live body palmmprint Acquisition Instrument with USB interface according to claim 1, it is characterized in that: the structure of described scanning collection car mainly comprises car body, plane mirror, optical lens and CCD linear array assembly.
3, the scanning imagery live body palmmprint Acquisition Instrument with USB interface according to claim 1 is characterized in that: the structure of described scanning motion assembly mainly comprises stepper motor, gear set, flute profile belt, slide bar, base, fixedly wheel shaft and stepper motor seat; Stepper motor and gear set are fixed by the stepper motor seat, and an end of flute profile belt is fixed by the stepper motor seat, and the other end of flute profile belt is fixed by fixing wheel shaft.
4, according to claim 2 or the described scanning imagery live body palmmprint Acquisition Instrument with USB interface of claim 3, it is characterized in that: the car body of described scanning collection car combines with the flute profile belt and the slide bar of described scanning motion assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320101990 CN2684278Y (en) | 2003-10-27 | 2003-10-27 | Scan imaging living body palm print collecting instrument having USB interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320101990 CN2684278Y (en) | 2003-10-27 | 2003-10-27 | Scan imaging living body palm print collecting instrument having USB interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2684278Y true CN2684278Y (en) | 2005-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320101990 Expired - Lifetime CN2684278Y (en) | 2003-10-27 | 2003-10-27 | Scan imaging living body palm print collecting instrument having USB interface |
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| CN (1) | CN2684278Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304922C (en) * | 2005-06-07 | 2007-03-14 | 清华大学 | Circuit interface for high-speed CCD camera |
| CN102521584A (en) * | 2011-10-31 | 2012-06-27 | 哈尔滨工业大学 | Human palm print image acquiring device and processing method |
| CN105279501A (en) * | 2015-11-13 | 2016-01-27 | 杭州指安科技股份有限公司 | Dark background turn-back palmprint acquisition device |
-
2003
- 2003-10-27 CN CN 200320101990 patent/CN2684278Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304922C (en) * | 2005-06-07 | 2007-03-14 | 清华大学 | Circuit interface for high-speed CCD camera |
| CN102521584A (en) * | 2011-10-31 | 2012-06-27 | 哈尔滨工业大学 | Human palm print image acquiring device and processing method |
| CN105279501A (en) * | 2015-11-13 | 2016-01-27 | 杭州指安科技股份有限公司 | Dark background turn-back palmprint acquisition device |
| CN105279501B (en) * | 2015-11-13 | 2018-08-21 | 杭州指安科技股份有限公司 | A kind of Zigzag type palm print collecting device of dark background |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING HISIGN TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: BEIJING HAIXIN KEJIN INFORMATION TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 100071, No. 139 Fengtai junction, Beijing, Fengtai District, 204 West Annex Building Patentee after: Haixinkejin High Sci. & Tech. Co., Ltd., Beijing Address before: 100036 room 205, Handan Iron and steel hotel, 21 West Third Ring Road, Beijing, Haidian District Patentee before: Beijing Haixin Kejin Information Technology Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20131027 Granted publication date: 20050309 |