CN103500326A - Embedded fingerprint acquisition instrument - Google Patents
Embedded fingerprint acquisition instrument Download PDFInfo
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- CN103500326A CN103500326A CN201310483509.1A CN201310483509A CN103500326A CN 103500326 A CN103500326 A CN 103500326A CN 201310483509 A CN201310483509 A CN 201310483509A CN 103500326 A CN103500326 A CN 103500326A
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Abstract
The invention discloses an embedded fingerprint acquisition instrument. The embedded fingerprint acquisition instrument comprises a fingerprint image acquisition device, an embedded master control module, an external memory, an LCD (liquid crystal display) and a fingerprint power supply module; the fingerprint image acquisition device acquires a fingerprint and is connected to the embedded master control module through a USB (universal serial bus) interface; an image size selection button, an image format selection button, a fingerprint sampling button, a fingerprint display button, a fingerprint storage button and a fingerprint image display area are arranged on a GUI (graphical user interface). The embedded fingerprint acquisition instrument can work without relying on a PC (personal computer) serving as an upper computer; the USB interface has a simple communication protocol and high universality; a visualization image is operated visually; subsequent development is convenient.
Description
Technical field
The present invention relates to application electric technology field and biological identity identification technical field, particularly a kind of fingerprint acquisition instrument based on embedded system.
Background technology
Common image can be directly with the equipment such as camera be taken pictures sampling storage at any time, and fingerprint image is different from common photo, it can not be very easily collected and store, make and how effectively obtain finger print information and become an important topic.For addressing this problem, people explore and have designed a lot of fingerprint collecting schemes and special fingerprint collecting structure.
A lot of traditional finger print acquisition modules are arranged in the market, mainly utilize the modes such as optical mode and electricity to be gathered fingerprint.These acquisition module common problems are: 1, need to rely on the control of PC host computer, can not independently carry out work, be unfavorable for carrying and carry out the fingerprint on site collection; 2, part fingerprint capturer output interface complicated, be not easy to communication connection and control, do not have the communication interface standard of standard, more difficult for needs obtain the user of original fingerprint image information; 3, lack independently visual application interface, and seldom can demonstrate fingerprint image and carry out quality discrimination for the user; 4, the sample format of fingerprint image and size are often fixing, can not be adjusted and arrange according to customer requirements.
The today developed rapidly in embedded technology, the fingerprint recognition field for the demand of embedded technology also growing, especially aspect fingerprint collecting, people expect to utilize embedded technology, flexible acquisition information in fingerprint, and collection and the post-processed of support fingerprint image, be beneficial to the expansion of fingerprint algorithm application.
Summary of the invention
The technical matters solved: for the deficiencies in the prior art, the invention provides a kind of embedded fingerprint Acquisition Instrument, solve fingerprint collecting in prior art and must rely on host computer work, delivery outlet communication interface complexity and the loaded down with trivial details technical matters of control protocol.
Technical scheme: for solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of embedded fingerprint Acquisition Instrument, comprise fingerprint image acquisition device, embedded main control module and external memory storage; Described embedded main control module is connected with external memory storage with the fingerprint image acquisition device respectively;
Described fingerprint image acquisition device comprises cmos image sensor, USB camera conversion chip and USB connector, be connected with the USB interface control chip on described embedded main control module, described USB connector and USB interface control chip are suitable, and described cmos image sensor gathers fingerprint and is connected and intercoms mutually with the USB interface control chip with USB connector by USB camera conversion chip.
Further, in the present invention, described embedded main control module is provided with the image setting module.Described image setting module comprises fingerprint image acquisition device output image form and output image size is set.
Further, in the present invention, described external memory storage is the SD card.The image be stored in the SD card can be read by PC, is convenient to do further processing.
Further, in the present invention, the master controller of described embedded main control module is 32 embedded microprocessors, and dominant frequency is more than 80Mhz.This microprocessor can be supported usb data communication, supports the peripheral hardwares such as LCD, SD card to get final product.
Further, in the present invention, described embedded main control module also is connected to the LCD LCDs, described liquid crystal display screen display GUI graphic user interface, be provided with picture size and select button, picture format to select button, fingerprint sampling button, fingerprint the Show Button, fingerprint save button and fingerprint image viewing area on described GUI graphic user interface.
Further, in the present invention, described embedded main control module also comprises NAND FLASH storer, and described NAND FLASH storer is programming ROM.NAND FLASH storer, for storage and the interim fingerprint image collected of preserving, when the user needs subsequent development, only need write the application module that can realize corresponding function in the NANDFLASH storer and get final product.
Further, in the present invention, described GUI graphic user interface also comprises the fingerprint denominational, and described embedded main control module is provided with the touch-screen input module.Insert 8 bit digital sequences and name to fingerprint in described fingerprint denominational, click " fingerprint preservation " button fingerprint image is preserved together with the fingerprint title.
Beneficial effect:
The invention provides a kind of fingerprint image acquisition device of USB interface, the fingerprint image acquisition device can carry out hardware with embedded main control module easily by USB interface and be connected, avoided loaded down with trivial details communication interface and control protocol, solved on market a lot of Camera interface fingerprint sensors that exist with the problem host computer difficult communication; The fingerprint image acquisition device of described USB interface is supported warm connection function, not only can be connected on general embedded platform, can also be connected to PC upper, has good universality.
In addition according to the characteristic Design of described fingerprint image acquisition device be specifically designed to and control the fingerprint sampling, show and the embedded main control module of storage, adjust neatly fingerprint image output image size and output image form in the situation that do not rely on the PC host computer according to user's request; On the basis in conjunction with LCD LCDs, SD card external memory storage, set up into the embedded fingerprint Acquisition Instrument that can carry out visual GUI graphic user interface operation.
NAND FLASH storer provides the application module expansion interface simultaneously, can be used for subsequent development.
Utilize technical scheme of the present invention, can adjust flexibly the form of output fingerprint image, gather easily, demonstration and memory image, and utilize efficiently the SD card to derive fingerprint image data.This series function makes for the follow-up study of information in fingerprint convenient, contributes to improve user experience and the system flexibility ratio of fingerprint product, collects and records personnel, fingerprint algorithm researchist and fingerprint product development business for fingerprint and has brought obvious benefit.
The accompanying drawing explanation
The circuit connection structure that Fig. 1 is fingerprint image collector in the present invention;
Fig. 2 is structural representation between main modular of the present invention;
Fig. 3 workflow diagram of the present invention;
Fig. 4 is GUI graphic user interface schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
A kind of embedded fingerprint Acquisition Instrument, comprise fingerprint image acquisition device 1, embedded main control module 2, external memory storage 4, LCD LCDs 5 and fingerprint supply module 9.
Described embedded main control module 2 is connected with fingerprint image acquisition device 1, external memory storage 4 and LCD LCDs 5 respectively, and is powered by fingerprint supply module 9, and described external memory storage 4 is the SD card; Described embedded main control module 2, based on (SuSE) Linux OS and USB video device driver, comprises the interlock circuits such as master controller, internal storage, USB interface control chip USB3343 and Peripheral Interface.
The master controller of described embedded main control module 2 is core components of embedded fingerprint Acquisition Instrument, has had its support just can complete collection, demonstration, the storage of fingerprint image and follow-up every work for the treatment of to fingerprint image.The master controller here is preferably 32 embedded microprocessors, can certainly be a kind of common microprocessor, only needs dominant frequency more than 80Mhz, can support usb data communication, supports the peripheral hardwares such as LCD, SD card to get final product.
Described internal storage comprises the NAND FLASH storer of 128M and the DDR2 memory grain of 128MB.This DDR2 memory grain is for related works such as the operation of complete operation system and memory-mapped.Store (SuSE) Linux OS and following several application module based on the Qt design in this NAND FLASH storer:
(1) image setting module: fingerprint image acquisition device 1 output image form and output image size are set; Described output image form can be selected in JPEG, YUV or rgb format any one; Described output image size is chosen as 640*480 pixel or 320*240 pixel;
(2) fingerprint sampling module: drive fingerprint image acquisition device 1 gather fingerprint image and be kept in the DDR2 memory grain temporarily;
(3) fingerprint display module: the image that will temporarily preserve is shown on LCD LCDs 5;
(4) fingerprint is preserved module: the fingerprint image that will temporarily preserve is saved in external memory storage 4;
Described GUI graphic user interface 3, based on the Qt design, is provided with " picture size selection " button, " picture format selection " button, " fingerprint sampling " button, " fingerprint demonstration " button, " fingerprint preservation " button and fingerprint image viewing area.These buttons are corresponding with corresponding application module, and operation GUI graphic user interface 3 triggers corresponding application module, realizes user's GUI operating function.
GUI graphic user interface 3 also comprises " fingerprint title " hurdle, and described embedded main control module 2 is provided with touch-screen input module 10.Insert 8 bit digital sequences and name to fingerprint in described " fingerprint title " hurdle, click " fingerprint preservation " button and drive fingerprint to preserve module work, corresponding fingerprint image and fingerprint title are preserved.
Described NAND FLASH storer is programming ROM, therefore the user also can be according to the function of the further expansion of self-demand and customized application module, the functional module that is used in reference to the print image subsequent treatment can be added on the basis of original application module, such as fingerprint image preprocessing module, fingerprint characteristic extraction module, fingerprint identification module etc.Amended application module only needs programming again to get final product in NAND FLASH storer.
Described fingerprint image acquisition device 1 comprises the fingerprint collecting window, and this fingerprint collecting window is assembled by optical prism group, focusing lens, backlight, shell, forms the fingerprint collecting window with 18mm*22mm size.The circuit that comprises 500dpi resolution, supports cmos image sensor 6, USB camera conversion chip 7 and the USB connector 8 of multiple sample format is set below the fingerprint collecting window, the model of described cmos image sensor 6 is HV7131R, and the model of described USB camera conversion chip 7 is VC0345.Interface DATA1:9, HSYNC, VSYVC, SCK, SDA, MCLK and EDB on described cmos image sensor 6 is connected to respectively CS_0:8, HSYNC, VSYNC, SCL, SDA, CS_CLK and the CS_EN interface on USB camera conversion chip 7 successively, and the interface DM on USB camera conversion chip 7 is connected with the DP interface with the DM on USB connector 8 respectively with DP.
Described USB camera conversion chip 7 is controlled cmos image sensor 6 by the SCL on it, SDA, CS_CLK, tetra-control signals of CS_EN.Wherein, SCL and SDA are the I2C protocol signal, and the former is clock signal, and the latter is data-signal, and USB camera conversion chip 7 utilizes the register of this two paths of signals read-write cmos image sensor 6, plays the configuration feature to cmos image sensor 6.CS_CLK is the pixel clock signal that USB camera conversion chip 7 is supplied with cmos image sensor 6, and CS_EN is for controlling the enable signal of cmos image sensor 6.6 of cmos image sensors send view data by 9 single data signal DATA1:9 and two frame synchronization trigger pip HSYNC and VSYNC to USB camera conversion chip 7.
On the other hand, described fingerprint image acquisition device 1 coordinates afterwards and is connected communication with the master controller of embedded main control module 2 by USB connector 8 and USB interface control chip 3343, and described VC0345USB camera conversion chip 7 is subject to main controller controls.Master controller utilizes usb protocol to transmit control signal to VC0345USB camera conversion chip 7, with this, suitable output image form and output image size are set, final cmos image sensor 6 samplings obtain data and are sent to master controller again after the usb protocol packing.Under the cooperation of optical prism group and focusing lens, backlight etc., can sample and obtain fingerprint image clearly.
During work, described embedded main control module 2 is by supply module 9 power supplies of 5V size, automatically start and be solidificated in (SuSE) Linux OS and the application module in NAND FLASH storer after embedded main control module 2 energisings, then the USB video device driver is carried out initialization to external memory storage 4, LCD LCDs 5 and fingerprint image acquisition device 1, derives subsequently GUI graphic user interface 3 and operate for the user on LCD LCDs 5.When the user need to carry out fingerprint image acquisition work, clicking respectively " picture size selection " button on GUI graphic user interface 3 is selected output image form and output image size with " picture format is selected to press " button, then fingerprint to be collected is positioned over to the fingerprint collecting window, click " fingerprint sampling " button and carry out the collection of fingerprint image, then click " fingerprint image demonstration " button, just can see in the fingerprint image viewing area gathered fingerprint; Now, if the fingerprint matching requirement gathered, can input 8 bit digital sequences in " fingerprint title " hurdle names to fingerprint, then clicking " fingerprint preservation " button fingerprint image and its title of collecting are saved in external memory storage 4 in the lump, is that the SD card can further export to the fingerprint of preservation in PC with external memory storage 4; If the fingerprint gathered is undesirable, can click " exiting " button, re-start fingerprint image acquisition.In operating process, on GUI graphic user interface 3, by establishing to " information indicating district ", can judge the operation correctness that the user is current and then corresponding Operating Guideline is provided.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. an embedded fingerprint Acquisition Instrument, is characterized in that: comprise fingerprint image acquisition device (1), embedded main control module (2) and external memory storage (4); Described embedded main control module (2) is connected with external memory storage (4) with fingerprint image acquisition device (1) respectively;
Described fingerprint image acquisition device (1) comprises cmos image sensor (6), USB camera conversion chip (7) and USB connector (8), be connected with the USB interface control chip on described embedded main control module (2), described USB connector (8) is suitable with the USB interface control chip, and described cmos image sensor (6) gathers fingerprint and is connected and intercoms mutually with the USB interface control chip with USB connector (8) by USB camera conversion chip (7).
2. a kind of embedded fingerprint Acquisition Instrument according to claim 1, it is characterized in that: described embedded main control module (2) is provided with the image setting module.
3. a kind of embedded fingerprint Acquisition Instrument according to claim 1, it is characterized in that: described external memory storage (4) is the SD card.
4. a kind of embedded fingerprint Acquisition Instrument according to claim 1, it is characterized in that: the master controller of described embedded main control module (2) is 32 embedded microprocessors, and dominant frequency is more than 80Mhz.
5. a kind of embedded fingerprint Acquisition Instrument according to claim 2, it is characterized in that: described embedded main control module (2) also is connected to LCD LCDs (5), described liquid crystal display screen display GUI graphic user interface (3), be provided with picture size and select button, picture format to select button, fingerprint sampling button, fingerprint the Show Button, fingerprint save button and fingerprint image viewing area on described GUI graphic user interface (3).
6. a kind of embedded fingerprint Acquisition Instrument according to claim 2 is characterized in that: described image setting module comprises fingerprint image acquisition device (1) output image form and output image size is set.
7. a kind of embedded fingerprint Acquisition Instrument according to claim 2, it is characterized in that: described embedded main control module (2) comprises NAND FLASH storer, described NAND FLASH storer is programming ROM.
8. a kind of embedded fingerprint Acquisition Instrument according to claim 5, it is characterized in that: described GUI graphic user interface (3) also comprises the fingerprint denominational, described embedded main control module (2) is provided with touch-screen input module (10).
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| CN201310483509.1A CN103500326A (en) | 2013-10-16 | 2013-10-16 | Embedded fingerprint acquisition instrument |
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| CN201310483509.1A CN103500326A (en) | 2013-10-16 | 2013-10-16 | Embedded fingerprint acquisition instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109492365A (en) * | 2018-10-12 | 2019-03-19 | 北京小米移动软件有限公司 | The identification method and device of finger print information |
| CN110163987A (en) * | 2019-06-25 | 2019-08-23 | 东北大学 | A kind of personnel participating in the meeting's essential information acquisition device |
| CN112433805A (en) * | 2020-12-17 | 2021-03-02 | 潍柴动力股份有限公司 | Simulation method and system of liquid crystal display screen |
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| CN102750520A (en) * | 2012-06-05 | 2012-10-24 | 东莞市中控电子技术有限公司 | Capacitive fingerprint detection device |
| CN102867136A (en) * | 2012-08-23 | 2013-01-09 | 杭州晟元芯片技术有限公司 | Second-generation identity card authentication system with fingerprint characteristics |
| CN102955932A (en) * | 2011-08-22 | 2013-03-06 | 武汉科技大学 | Method and system for identifying fingerprints on basis of embedded QNMV (quad-neighborhood-minutiae-vector) |
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Patent Citations (3)
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| CN102955932A (en) * | 2011-08-22 | 2013-03-06 | 武汉科技大学 | Method and system for identifying fingerprints on basis of embedded QNMV (quad-neighborhood-minutiae-vector) |
| CN102750520A (en) * | 2012-06-05 | 2012-10-24 | 东莞市中控电子技术有限公司 | Capacitive fingerprint detection device |
| CN102867136A (en) * | 2012-08-23 | 2013-01-09 | 杭州晟元芯片技术有限公司 | Second-generation identity card authentication system with fingerprint characteristics |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109492365A (en) * | 2018-10-12 | 2019-03-19 | 北京小米移动软件有限公司 | The identification method and device of finger print information |
| CN109492365B (en) * | 2018-10-12 | 2022-04-01 | 北京小米移动软件有限公司 | Fingerprint information identification method and device |
| CN110163987A (en) * | 2019-06-25 | 2019-08-23 | 东北大学 | A kind of personnel participating in the meeting's essential information acquisition device |
| CN112433805A (en) * | 2020-12-17 | 2021-03-02 | 潍柴动力股份有限公司 | Simulation method and system of liquid crystal display screen |
| CN112433805B (en) * | 2020-12-17 | 2023-05-23 | 潍柴动力股份有限公司 | Simulation method and system of liquid crystal display screen |
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Application publication date: 20140108 |