CN1144944A - Image processer and finger-print image camera for finger-print lock - Google Patents

Abstract

A dactylogram image camera for dactylogram lock uses the full-reflection principle of triple prism to pass the dactylogram image to image processing system. Said image processing system for dactylogram lock is composed of high-speed digital information processing chip as CPU and special software for complex image processing algorithm, pattern recognition algorithm, communication, management and debugging. A dactylogram lock has small size and complete functions. Pressing finger on said camera can unlock the dactylogram lock.

Description

The image processing system and the finger print image picked-up instrument that are used for Fingerprint Lock

The present invention relates to be used for the image processing system and the finger print image picked-up instrument of Fingerprint Lock, belong to technical field of fixed buildings.

In the place of the national treasury of bank, arm store, archives, preservation art treasures, document and the place that needs strict insurance or maintain secrecy such as sedan limousine, luxurious hotel, the level of security that requires is very high, for the needs of ensuring public security, the entrance guard devices such as mechanical lock, coded lock of meticulous setting are generally arranged all.But the stolen incident of great majority is all relevant with key: mechanical lock can be opened with skeleton key or imitated key, and coded lock also can be decoded by experienced burglar, the then more difficult prevention of defalcating.We utilize the uniqueness and the lifelong constant characteristics of fingerprint, have developed Fingerprint Lock, and the unique key of this lock is exactly people's a finger, thereby has prevented the generation of above-mentioned incident effectively.

Verified in theory, people's fingerprint has uniqueness and stability.Thereby just fingerprint is used for identity authentication from ancient times.After the computing machine development, the device that discriminates one's identification of all useful fingerprint of public security department comes out both at home and abroad, but all with workstation or microcomputer as main frame.The purpose that this can't be used to ensure public security in a lot of occasions.

The objective of the invention is to design a kind of Fingerprint Lock of special use, brand-new design is partly carried out in wherein finger print image picked-up part and image processing.Utilize the optical total-reflection principle to obtain finger print information, as CPU, make the Fingerprint Lock of special machine formula, make it have characteristics such as volume is little, in light weight, function is complete, purposes is wide with the high-speed digital signal process chip.

The finger print image picked-up instrument of the Fingerprint Lock of the present invention's design is made up of prism, light source and gamma camera.The faceted pebble of prism (a) contacts with finger, and faceted pebble (b) is relative with planar light source, and faceted pebble (c) is relative with gamma camera.The planar light that light source sends projects on the faceted pebble a after seeing through prism, and faceted pebble a absorbs and penetrates the part light that comes and remainder light is penetrated total reflection to faceted pebble c, so finger print image enters gamma camera with light clearly.

The image processing system of the Fingerprint Lock of the present invention's design is made up of CPU element, interface driver element and finger-board unit;

CPU element wherein comprises:

(1) central processing unit (U100) that moves in order to the finger print image handling procedure;

(2) in order to deposit data image storer (U101-U104) from the digital image of interface driver unit;

(3) in order to deposit, move various handling procedures and deposit the image processing result program storage (U108, U109, U129, U131, U106, U107);

(4) in order to produce the crystal oscillator (U16) of the required clock of A/D conversion behind the frequency division;

(5) in order to control the I/O port code translator (U121) of I/O mouth input and output;

(6) select code translator (U123) in order to the memory chip of control store read-write;

(7) horizontal-drive signal that the interface driver unit is sent here and vertical synchronizing signal this simple form become the image acquisition address the image acquisition address generator (U1, U2);

Interface driver element wherein comprises:

(1) will carry out the sync separator (U38) of separated in synchronization from the image video signal that finger print image absorbs instrument;

(2) horizontal-drive signal after the separated in synchronization and vertical synchronizing signal are carried out the timer (U31) that monostable delay is handled, the horizontal-drive signal of delayed processing and vertical synchronizing signal are delivered to the image acquisition address generator (U1 and U2) of CPU element;

(3) will carry out the isolated amplifier (U63) of isolation buffer and carry out analog-to-digital A/D transducer (U0) from the image video signal that finger print image absorbs instrument;

(4) above-mentioned digital signal is latched latch (U24) and the data bus (D0-D15) of sending into CPU element after the buffering;

(5) in order to the EEPROM (U14) and the data-carrier store (U22) of data cut-off protection;

(6) in order to reset, the combinational logic generator (U21) of retentive control, serial communication;

(7) in order to prevent that program from walking to fly to cause the watchdog circuit of system in case of system halt (U13);

(8) power on and the automatic power down element circuit, form by monostable timing device U4, relay U3, U33 and T62;

(9) in order to the optical coupling isolator (U15) that the electromagnetic lock drive part in image processing system and the Fingerprint Lock is isolated;

(10) open and close output circuit T1 and the T4 that drive current is provided for electromagnetic lock;

Finger-board unit wherein comprises:

(1) the management control chip U1 that moves in order to supervisory routine;

(2) in order to stored program program storage U7;

(3) make management control chip and program storage carry out the latch (U3) of address latch;

(4) in order to the decoupling isolator U15 of serial communication, wave shaping U11 and communication drive T3;

(5) be used for the voltage stabilizer U10 of power supply voltage stabilizing;

(6) in order to key in the finger-board of control signal.

Description of drawings:

Fig. 1 is the structural representation of fingerprint image pickup instrument among the present invention.

Fig. 2 is a Fingerprint Lock image processing system composition frame chart.

Fig. 3 and Fig. 4 are the circuit theory diagrams of CPU element in the image processing system.

Fig. 5, Fig. 6 and Fig. 7 are the circuit theory diagrams of interface driver element in the image processing system.

Fig. 8 and Fig. 9 are the circuit theory diagrams of finger-board unit in the image processing system.

Figure 10 is the Fingerprint Lock workflow diagram.

Figure 11 is fingerprint image processing workflow figure.

Below in conjunction with accompanying drawing, introduce content of the present invention in detail.Fig. 1 is in order to obtain the finger print image picked-up instrument of finger print image in the Fingerprint Lock of the present invention.Among the figure, the 1st, optics prism, the 2nd, video camera, the 3rd, planar light source, the 4th, fingerprint carina.The function of finger print image picked-up instrument is the grey scale change that the elevation information of fingerprint protuberance is converted into image, is translated into TV signal again and delivers to the finger print image disposal system.Its principle of work as shown in Figure 1.The planar light that light source 3 sends projects the upper surface a of prism 1, because the fingerprint carina partly is close to prism facets, it has absorbed the light of penetrating, and the total reflection of fingerprint ditch part light, this has just formed chequered with black and white finger print image, through CCD gamma camera 2, just make finger print image become TV signal and deliver to image processing system.

This finger print image picked-up instrument is simple, compact conformation, and speed is very fast.Need not by means of ink paste, paper etc. can form fingerprint clearly.Generally can in the CCD gamma camera is exported time of a frame image (about 1/25 second), signal all be delivered in the fingerprint processor.

This finger print image picked-up instrument also has following characteristics:

1, utilized the total reflection principle of light, guaranteed higher soot-and-whitewash contrast, the not high shortcoming of contrast when having overcome direct picked-up finger print image.

2, Tu Xiang distortion is little, more stable.By on glass planar, just can form a width of cloth plan view image to finger, particularly image does not have any relation with finger size firmly.

3, compact conformation, image quality can satisfy the requirement of Fingerprint Lock well.

The finger print image disposal system comprises CPU element, interface driver element and finger-board unit.

CPU element provides a relatively independent hardware environment and has handled so that carry out high speed signal.On circuit design, consider versatility and extensibility as far as possible, and suitably simplified internal circuit.Its circuit theory diagrams as shown in Figure 3 and Figure 4.

In Fig. 3, data-carrier store U101, U102, U103, U104, and program storage U108, U109 be mainly used to deposit the finger print image of picked-up and the intermediate result of image processing, and program storage U129, U131 and U106, U107 is used for depositing and move various handling procedures.In addition, also have I/O port code translator U121 on the plate, memory chip is translated code controller U123 etc. selectively.

Fig. 4 contains central processing unit U100, bus driver for isolating U117, U119, U111, U112, image acquisition address generator U1, U2 and 40M crystal oscillator U126.In addition, also have one group of expansion interface signal of selecting meticulously (to be connecting groove U12, U13), mainly to contain 16 address wires, 16 data lines, and interrupt line, read-write line, select lines, power lead, ground wire etc. on the plate.

In this part, the operation of CPU (U100) control program, the finger print image signal that image acquisition part (on the interface driver element) is sent here carries out binaryzation, refinement, extract multiple processing such as feature, the various features of fingerprint have been obtained, and with there being characteristic data memory (EEROMU14 on the IO plate 1, U25) the imagery pack feature in compares, thereby people's identity is differentiated.

The interface driver element for high-speed digital signal handle CPU element provide one with the outside I/O passage that communicates control, mainly comprise data acquisition, state input, control output, power drive etc.Its circuit theory diagrams are seen Fig. 5-Fig. 7.

Among Fig. 5, the image acquisition part is made up of isolated amplifier U63, sync separator U30, chronotron U31, A-D converter U0, latch U24 and crystal oscillator U16 etc.The effect of this part is that the image that finger print image picked-up instrument obtains is become the digital image signal that can be operated by CPU element.The course of work is as follows:

After the compound composite video signal VIN of positive polarity black and white enters system, send into sync separator (U38) and isolated amplifier (U63) through coupling capacitance C12 and C24 respectively, vision signal is sent into timer U31:A through sync separator (U38) generation horizontal-drive signal and is carried out monostable delay processing, and produced simultaneously vertical synchronizing signal is also sent into timer U31:B and carried out monostable delay processing.The horizontal-drive signal of delayed processing and vertical synchronizing signal are delivered to U1 and the U2 on the CPU element, in order to form the address of image acquisition.

Meanwhile, the image video signal of input is after isolated amplifier (U63) buffering, send into video a/d transducer (U0), the digital signal that the A/D conversion produces latchs buffering through latch (U24), again through data bus (D0-D15) CPU board 1 (Fig. 3), and in digital image storer U101 U102U103 U104 and program storage U108 U109, carry out image and preserve and handle.Crystal oscillator (U16) output signal produces the required clock of A/D conversion behind the U22 frequency division.

Fig. 5 also comprises some auxiliary functional circuits of system; as EEPROM U14 and U25 has been the characteristic data memory (being file data) of data cut-off protection effect; U22 is the timing sequencer of image acquisition, and U21 plays effects such as the control of image acquisition frame, the control that resets.U17 is the state input port, and U23 is an output control mouth.

U13 among Fig. 6 is a watchdog circuit, can prevent effectively because the program system in case of system halt walking to fly to cause, to guarantee the operate as normal of system.But U4 is the monostable timing device of repeated trigger, and U3 is a relay, and the two is formed with D62, T62 and powers on and the automatic power down element circuit, in time closes after making the Fingerprint Lock power cut-off, to protect whole Fingerprint Lock device.In addition, U11 is the optocoupler input, and U1 drives output.

Among Fig. 7, U15 is light-coupled isolation, and it makes the signal processing of system and electromagnetic lock drive part separate to prevent damage from electric.And T2 and T4 constitute the two-way output circuit, for the switching of electromagnetic lock provides drive current.

The finger-board unit is positioned on the finger print image picked-up instrument, circuit diagram such as Fig. 8, shown in Figure 9.

In Fig. 8, U1 is finger-board partial C PU, in order to the operation of control supervisor.U7 is the program storage of 16K, is used for storage management program.Latch U3 plays mainly that sequential cooperates between U1 (8751) and the U7.U13 and U11:B form the house dog electrify restoration circuit.12 volts of voltages can obtain 5 volts of voltages after three terminal regulator U10 step-down, use for related circuit.

Among Fig. 9, U15 and T3 are serial communication interface circuits.Sheffer stroke gate U11 and triode T1, T4 respectively driven for emitting lights pipe and hummer to carry out the state indication.

The main effect of this part is for the user provides interactive device, but functions such as completion status setting, status poll.

Image processing system part in Fingerprint Lock of the present invention, main hardware circuit has all used fast device, and it is the basis of realizing the Fingerprint Lock device.The software of native system has been realized communication, management and the system debug program etc. of complicated image processing algorithm, algorithm for pattern recognition and full machine, thereby the function of total system is very strong.Its comprehensive function has:

1, write down the archives of unblanking:

This lock can keep the fingerprint file of last tens unlocking persons, in case stolen incident takes place, extracts these information and can assist to solve a case.

2, have the associating unlocking function:

This machine can be stored ten people's fingerprint at most.So-called associating unlocking function just can be opened lock after being meant and must successively importing several people's fingerprint.Obviously, this is very useful to the national treasury that the several people takes key to open simultaneously.

3, differentiated control function:

This lock is divided into two-stage and is responsible for, and the highest person in charge can determine the user according to the password of grasping, and input user's fingerprint and password, and the Tier 2 manager can only operate Fingerprint Lock.

4, easy to maintenance

This machine has supporting special-purpose debug platform, produces and keep in repair very convenient.

The key technical indexes of Fingerprint Lock of the present invention is:

Misclassification rate＜0.000001

Reject rate＜0.02

Processing time＜3 second (to general fingerprint)

The fingerprint file that can keep unlocking person

Have and unite the function of unblanking

Can carry out differentiated control as required, every grade can add password respectively again

Supporting special-purpose debug platform is arranged, be convenient to produce and keep in repair.

The volume of finger print image picked-up instrument is 88 * 99 * 80 cubic millimeters

The volume of finger print image processor is 190 * 150 * 85 cubic millimeters

Claims (2)

1, a kind of finger print image picked-up instrument that is used for Fingerprint Lock is characterized in that finger print image absorbs instrument and is made up of triangular device, light source and gamma camera; The faceted pebble of described prism (a) contacts with finger, faceted pebble (b) is relative with planar light source, and faceted pebble (c) is relative with gamma camera, and the planar light that light source sends projects on the faceted pebble a after seeing through prism, light that faceted pebble a absorption is penetrated and total reflection are to faceted pebble c, and finger print image enters gamma camera with light.

2, a kind of image processing system that is used for Fingerprint Lock is characterized in that this image processing system is made up of CPU element, interface driver element and finger-board unit;

CPU element wherein comprises:

(1) central processing unit (U100) that moves in order to the finger print image handling procedure;

(2) in order to deposit data image storer (U101-U104) from the digital image of interface driver unit;

(3) in order to deposit, move various handling procedures and deposit the image processing result program storage (U108, U109, U129, U131, U106, U107);

(4) in order to produce the crystal oscillator (U16) of the required clock of A/D conversion behind the frequency division;

(5) in order to control the I/O port code translator (U121) of I/O mouth input and output;

(6) select code translator (U123) in order to the memory chip of control store read-write;

(7) horizontal-drive signal that the interface driver unit is sent here and vertical synchronizing signal this simple form become the image acquisition address the image acquisition address generator (U1, U2);

Interface driver element wherein comprises:

(1) will carry out the sync separator (U38) of separated in synchronization from the image video signal that finger print image absorbs instrument;

(2) horizontal-drive signal after the separated in synchronization and vertical synchronizing signal are carried out the timer (U31) that monostable delay is handled, the horizontal-drive signal of delayed processing and vertical synchronizing signal are delivered to the image acquisition address generator (U1 and U2) of CPU element;

(3) will carry out the isolated amplifier (U63) of isolation buffer and carry out analog-to-digital A/D transducer (U0) from the image video signal that finger print image absorbs instrument;

(4) above-mentioned digital signal is latched latch (U24) and the data bus (D0-D15) of sending into CPU element after the buffering;

(5) in order to the EEPROM (U14) and the data-carrier store (U22) of data cut-off protection;

(6) in order to reset, the combinational logic generator (U21) of retentive control, serial communication;

(7) in order to prevent that program from walking to fly to cause the watchdog circuit of system in case of system halt (U13);

(8) power on and the automatic power down element circuit, form by monostable timing device U4, relay U3, U33 and T62;

(9) in order to the optical coupling isolator (U15) that the electromagnetic lock drive part in image processing system and the Fingerprint Lock is isolated;

(10) open and close output circuit T1 and the T4 that drive current is provided for electromagnetic lock;

Finger-board unit wherein comprises:

(1) the management control chip U1 that moves in order to supervisory routine;

(2) in order to stored program program storage U7;

(3) make management control chip and program storage carry out the latch (U3) of address latch;

(4) in order to the decoupling isolator U15 of serial communication, wave shaping U11 and communication drive T3;

(5) be used for the voltage stabilizer 10 of power supply voltage stabilizing;

(6) in order to key in the finger-board of control signal.

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