CN108875635A - A kind of finger vein image acquisition system - Google Patents

A kind of finger vein image acquisition system Download PDF

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Publication number
CN108875635A
CN108875635A CN201810631464.0A CN201810631464A CN108875635A CN 108875635 A CN108875635 A CN 108875635A CN 201810631464 A CN201810631464 A CN 201810631464A CN 108875635 A CN108875635 A CN 108875635A
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CN
China
Prior art keywords
finger
infrared
controller
array
image acquisition
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201810631464.0A
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Chinese (zh)
Inventor
文纪斌
张承江
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Changzhou College of Information Technology CCIT
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Changzhou College of Information Technology CCIT
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Priority to CN201810631464.0A priority Critical patent/CN108875635A/en
Publication of CN108875635A publication Critical patent/CN108875635A/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

The invention discloses a kind of finger vein image acquisition systems, belong to human-body biological identification technology field, including controller, infrared camera, common camera, optical filter and infrared light supply array, optical filter respectively separates infrared camera and common camera with infrared light supply array, one end of optical filter, which is equipped with, touches capacitor, capacitor is touched to connect with controller, infrared camera and common camera pass through webcam driver circuit and connect with controller, controller is connect by potentiometer array with infrared light supply array, lens are equipped between optical filter and infrared light supply array, touch that capacitor is used to determine finger is put into position.The present invention passes through the irradiation of infrared camera and infrared light supply array to finger vena, the effective solution prior art, as light source, and leads to that image conformity is poor, intensity of illumination is inadequate, can not be completely covered the problem of finger using common camera and white light LEDs.

Description

A kind of finger vein image acquisition system
Technical field
The present invention relates to a kind of venous collection systems to belong to people more particularly to a kind of finger vein image acquisition system Body technical field of biometric identification.
Background technique
Vein identification technology is the light principle that certain wavelength can be absorbed according to the hemoglobin in human vein, is made When irradiating vein with the light in the wave-length coverage, vein image is obtained, then the image of acquisition is analyzed and processed, finally Obtained vein pattern value is matched in the database, realizes and the identity of individual is identified, currently, finger venous image Acquisition and identification lead to that image conformity is poor, illumination is strong mainly using a kind of common camera and white light LEDs as light source Degree is inadequate, the problem of finger can not be completely covered, and it is fixed to acquire flashing, and collected finger venous image is caused to hold Easily distortion, causes picture quality that cannot meet the requirements.
Summary of the invention
The main object of the present invention is to provide for a kind of finger vein image acquisition system, solves image in the prior art Uniformity is poor, intensity of illumination is inadequate, finger can not be completely covered and acquires the fixed problem of flashing.
The purpose of the present invention can reach by using following technical solution：
A kind of finger vein image acquisition system, including OV7411P controller, infrared camera, common camera, optical filtering Piece and infrared light supply array, the optical filter is respectively by the infrared camera and the common camera and the infrared light supply Array separates, and one end of the optical filter, which is equipped with, touches capacitor, and the touch capacitor is connect with the OV7411P controller, institute It states infrared camera and the common camera passes through webcam driver circuit and connect with the OV7411P controller, it is described OV7411P controller is connect by potentiometer array with the infrared light supply array, the optical filter and the infrared light supply battle array Be equipped with lens between column, it is described touch that capacitor is used to determine finger be put into position.
Preferably, the OV7411P controller uses 2 line 12C bus interface modes, and bus high level is 5V, low electricity It puts down as 0V.
Preferably, the SDL pin of the OV7411P controller and SDA pin with the webcam driver circuit connection；
GAMMA pin, the AGCEN pin of the OV7411P controller are connected to low level, for close gamma correction and Automatic gain function；
The 12CEN pin of the OV7411P controller connects pull-up resistor, starts 12C digital serial interface function, while certainly The closing of dynamic shutter function.
Preferably, the webcam driver circuit is divided into three groups, two LED hairs of webcam driver circuit drives described in every group Light pipe, the operating voltage of every group of LED light tube are 2-5V.
Preferably, the control interface of the webcam driver circuit uses 2 line 12C bus marcos.
Preferably, the webcam driver circuit adjusts the output voltage V of digital regulation resistance by 12C busw, VwThrough transporting A stable output voltage V is obtained after calculating amplifier amplification0, by current-limiting resistance R3Drive LED light tube, digital regulation resistance The address 12C pass through A0、A2、A3It is configured.
Preferably, the infrared camera refers to vein image for acquiring, and the common camera is equipped with white light LEDs, By the White-LED lamp, finger surface image is obtained.
Preferably, the infrared light supply array is rearranged by 6 φ 5mm near-infrared LED luminous tubes.
Preferably, the central wavelength of LED light tube is 835nm, and the light that the infrared light supply array issues is from dorsal surfaces of fingers Input finally forms finger venous image on the infrared camera and the common camera through finger tissue output.
Preferably, the infrared light supply array forms matrix form, and every a line series connection is generated uniform by the lens Directional light, and by the potentiometer antenna array control brightness, the potentiometer array passes through the electricity by the OV7411P controller The pulse signal of position device array controls to adjust the brightness of infrared LED.
Advantageous effects of the invention：
1, finger vein image acquisition system according to the invention, finger vein image acquisition system provided by the invention, Irradiation by infrared camera and infrared light supply array to finger vena, the effective solution prior art is using common camera shooting Head and white light LEDs lead to that image conformity is poor, intensity of illumination is inadequate, the problem of finger can not be completely covered as light source.
2, finger vein image acquisition system according to the invention, finger vein image acquisition system provided by the invention, Infrared light supply forms matrix form, every a line series connection, and controls brightness by digital regulation resistance, not due to finger different parts thickness Together, in order to enable transmitted light is uniform, adjustable light sources are designed；Digital potentiometer passes through pulse signal control by OV7411P controller System is adjusted；The adjusting of brightness is fed back according to the clear background degree of acquisition image to be realized.
3, finger vein image acquisition system according to the invention, finger vein image acquisition system provided by the invention, Determine that finger is put into place by touching capacitor；Infrared light supply array generates uniform directional light by the lens template of design； Dual camera design, one refers to vein image for acquiring, another obtains finger surface image by White-LED lamp, two Person combines, and can determine and refer to vein in the position of finger；Due to finger thickness difference, can by the background of the image of measurement, OV7411P controller is fed back, digital regulation resistance array is controlled by OV7411P controller, realizes the brightness regulation of infrared LED.
Detailed description of the invention
Fig. 1 is the structure principle chart of a preferred embodiment of finger vein image acquisition system according to the invention；
Fig. 2 is the circuit of light sources figure of a preferred embodiment of finger vein image acquisition system according to the invention；
The control electricity that Fig. 3 is the OV7411P of a preferred embodiment of finger vein image acquisition system according to the invention Lu Tu；
Fig. 4 is the webcam driver circuit of a preferred embodiment of finger vein image acquisition system according to the invention Figure；
Fig. 5 is the finger vein pattern curve of a preferred embodiment of finger vein image acquisition system according to the invention Figure；
Fig. 6 is the finger vein image of a preferred embodiment of finger vein image acquisition system according to the invention.
In figure：1-OV7411P controller, 2- webcam driver circuit, 3- infrared camera, 4- common camera, 5- are white Light LED, 6- potentiometer array, 7- optical filter, 8- touch capacitor, 9- lens, 10- infrared light supply array, 11- finger.
Specific embodiment
To make the more clear and clear technical solution of the present invention of those skilled in the art, below with reference to examples and drawings The present invention is described in further detail, and embodiments of the present invention are not limited thereto.
As depicted in figs. 1 and 2, a kind of finger vein image acquisition system provided in this embodiment, including OV7411P control Device 1, infrared camera 3, common camera 4, optical filter 7 and infrared light supply array 10, optical filter 7 is respectively by infrared camera 3 Separated with common camera 4 and infrared light supply array 10, one end of optical filter 7, which is equipped with, touches capacitor 8, touch capacitor 8 with OV7411P controller 1 connects, and infrared camera 3 and common camera 4 are controlled by webcam driver circuit 2 and OV7411P Device 1 connects, and OV7411P controller 1 is connect by potentiometer array 6 with infrared light supply array 10, optical filter 7 and infrared light supply battle array Lens 9 are equipped between column 10, touch that capacitor 8 is used to determine finger 11 is put into position.
In the present embodiment, as shown in Figure 1, Figure 2 and Figure 3, OV7411P controller 1 uses 2 line 12C bus interface moulds Formula, bus high level are 5V, low level 0V；The SDL pin and SDA pin of OV7411P controller 1 are electric with webcam driver Road 2 connects；GAMMA pin, the AGCEN pin of OV7411P controller 1 are connected to low level, for closing gamma correction and oneself Dynamic gain function；The 12CEN pin of OV7411P controller 1 connects pull-up resistor, starts 12C digital serial interface function, while certainly The closing of dynamic shutter function.
In the present embodiment, as shown in Figure 1 and Figure 4, webcam driver circuit 2 is divided into three groups, every group of webcam driver electricity Road 2 drives two LED light tube, and the operating voltage of every group of LED light tube is 2-5V；The control interface of webcam driver circuit 2 Using 2 line 12C bus marcos；Webcam driver circuit 2 adjusts the output voltage V of digital regulation resistance by 12C busw, VwThrough A stable output voltage V is obtained after operational amplifier amplification0, by current-limiting resistance R3Drive LED light tube, digital current potential The address 12C of device passes through A0、A2、A3It is configured.
In the present embodiment, as depicted in figs. 1 and 2, infrared camera 3 refers to vein image, common camera 4 for acquiring White light LEDs 5 are equipped with, are irradiated by white light LEDs 5, finger surface image is obtained.
In the present embodiment, as shown in Figure 1 and Figure 4, infrared light supply array 10 is arranged by 6 φ 5mm near-infrared LED luminous tubes Column composition；The central wavelength of LED light tube is 835nm, and the light that infrared light supply array 10 issues is inputted from dorsal surfaces of fingers, through hand Refer to that tissue output finally forms finger venous image on infrared camera 3 and common camera 4；The formation of infrared light supply array 10 Matrix form, every a line series connection generate uniform directional light by lens 9, and control brightness, potentiometer by potentiometer array 6 Array 6 is controlled to adjust the brightness of infrared LED by OV7411P controller 1 by the pulse signal of potentiometer array 6.
In the present embodiment, as depicted in figs. 1 and 2, infrared light supply array 10 is arranged by 6 φ 5mm near-infrared LED luminous tubes Column composition, the central wavelength of LED light tube are 835nm, and the light that near-infrared light source issues is inputted from dorsal surfaces of fingers, through finger group It knits output and finally forms finger venous image on infrared camera 3 and common camera 4, but due to the difference of individual, Same light source brightness F, due to the difference of the size of each finger, thickness etc., the brightness of obtained finger venous image is just Corresponding difference is had, it is excessively bright and be secretly all unfavorable for subsequent image procossing excessively, or even can not identify, therefore, near-infrared light source Brightness must be adjustable；In addition, the light transmission at three positions is also inconsistent before, during and after everyone the same finger, often go out Existing finger front brightness is excessively high, and the partially dark situation of brightness in the middle part of finger, and therefore, the brightness of near-infrared light source must also be segmented can It adjusts.
In the present embodiment, as shown in Fig. 5-Fig. 6, Fig. 5 is to refer to vein pattern curve graph, and Fig. 6 is to refer to vein image, is obtained Finger venous image in it is almost the same in terms of the contrast of finger vena, form, in order to the quality for referring to vein pattern curve It is evaluated, extracts finger vein image, refer to vein image as the result is shown and refer to that vein pattern curve distribution is almost the same.
In the present embodiment, according to the finger vein image acquisition system of the present embodiment, finger provided in this embodiment is quiet Arteries and veins image capturing system, irradiation by infrared camera and infrared light supply array to finger vena, effective solution are existing Technology, as light source, and leads to that image conformity is poor, intensity of illumination is inadequate, can not be complete using common camera and white light LEDs The problem of all standing finger.
In the present embodiment, infrared light supply forms matrix form, every a line series connection, and controls brightness by digital regulation resistance, Since finger different parts thickness is different, in order to enable transmitted light is uniform, adjustable light sources are designed；Digital potentiometer by OV7411P controller is controlled to adjust by pulse signal；The adjusting of brightness is fed back according to the clear background degree of acquisition image to be realized.
In the present embodiment, determine that finger is put into place by touching capacitor；The lens that infrared light supply array passes through design Template generates uniform directional light；Dual camera design, one refers to vein image for acquiring, another is shone by white light LEDs It penetrates, obtains finger surface image, the two combines, can determine and refer to vein in the position of finger.
To sum up, in the present embodiment, it due to finger thickness difference, can be fed back by the background of the image of measurement OV7411P controller controls digital regulation resistance array by OV7411P controller, realizes the brightness regulation of infrared LED.
The above, further embodiment only of the present invention, but scope of protection of the present invention is not limited thereto, and it is any Within the scope of the present disclosure, according to the technique and scheme of the present invention and its design adds those familiar with the art With equivalent substitution or change, protection scope of the present invention is belonged to.

Claims (10)

1. a kind of finger vein image acquisition system, which is characterized in that including OV7411P controller (1), infrared camera (3), Common camera (4), optical filter (7) and infrared light supply array (10), the optical filter (7) is respectively by the infrared camera (3) it is separated with the common camera (4) with the infrared light supply array (10), one end of the optical filter (7), which is equipped with, to be touched Capacitor (8), the touch capacitor (8) connect with the OV7411P controller (1), the infrared camera (3) and described common Camera (4) is connect by webcam driver circuit (2) with the OV7411P controller (1), the OV7411P controller (1) it is connect by potentiometer array (6) with the infrared light supply array (10), the optical filter (7) and the infrared light supply battle array Arrange and be equipped with lens (9) between (10), it is described touch that capacitor (8) be used to determine finger (11) be put into position.
2. a kind of finger vein image acquisition system as described in claim 1, which is characterized in that the OV7411P controller (1) 2 line 12C bus interface modes are used, bus high level is 5V, low level 0V.
3. a kind of finger vein image acquisition system as claimed in claim 2, which is characterized in that the OV7411P controller (1) SDL pin and SDA pin is connect with the webcam driver circuit (2)；
GAMMA pin, the AGCEN pin of the OV7411P controller (1) are connected to low level, for close gamma correction and Automatic gain function；
The 12CEN pin of the OV7411P controller (1) connects pull-up resistor, starts 12C digital serial interface function, while certainly The closing of dynamic shutter function.
4. a kind of finger vein image acquisition system as described in claim 1, which is characterized in that the webcam driver circuit (2) it is divided into three groups, webcam driver circuit (2) described in every group drives two LED light tube, the work electricity of every group of LED light tube Pressure is 2-5V.
5. a kind of finger vein image acquisition system as claimed in claim 4, which is characterized in that the webcam driver circuit (2) control interface uses 2 line 12C bus marcos.
6. a kind of finger vein image acquisition system as claimed in claim 5, which is characterized in that the webcam driver circuit (2) the output voltage V of digital regulation resistance is adjusted by 12C busw, VwObtained after operational amplifier amplifies one it is stable defeated Voltage V out0, by current-limiting resistance R3LED light tube is driven, the address 12C of digital regulation resistance passes through A0、A2、A3It is configured.
7. a kind of finger vein image acquisition system as described in claim 1, which is characterized in that the infrared camera (3) Referring to vein image for acquiring, the common camera (4) is equipped with white light LEDs (5), it is irradiated by the white light LEDs (5), Obtain finger surface image.
8. a kind of finger vein image acquisition system as described in claim 1, which is characterized in that the infrared light supply array (10) it is rearranged by 6 φ 5mm near-infrared LED luminous tubes.
9. a kind of finger vein image acquisition system as claimed in claim 8, which is characterized in that the middle cardiac wave of LED light tube A length of 835nm, the light that the infrared light supply array (10) issues are inputted from dorsal surfaces of fingers, are exported through finger tissue finally in institute It states and forms finger venous image in infrared camera (3) and the common camera (4).
10. a kind of finger vein image acquisition system as described in claim 1, which is characterized in that the infrared light supply array (10) matrix form is formed, every a line series connection generates uniform directional light by the lens (9), and by the potentiometer battle array It arranges (6) and controls brightness, the potentiometer array (6) passes through the potentiometer array (6) by the OV7411P controller (1) The brightness of pulse signal control and regulation infrared LED.
CN201810631464.0A 2018-06-19 2018-06-19 A kind of finger vein image acquisition system Withdrawn CN108875635A (en)

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CN201810631464.0A CN108875635A (en) 2018-06-19 2018-06-19 A kind of finger vein image acquisition system

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Application Number Priority Date Filing Date Title
CN201810631464.0A CN108875635A (en) 2018-06-19 2018-06-19 A kind of finger vein image acquisition system

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110188676A (en) * 2019-05-29 2019-08-30 Oppo广东移动通信有限公司 Vein collection method and Related product
CN110298261A (en) * 2019-06-06 2019-10-01 Oppo广东移动通信有限公司 Vein identification method and Related product
CN110533010A (en) * 2019-10-10 2019-12-03 中国计量大学 Adaptive light source finger vein image acquisition system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110188676A (en) * 2019-05-29 2019-08-30 Oppo广东移动通信有限公司 Vein collection method and Related product
CN110188676B (en) * 2019-05-29 2021-04-13 Oppo广东移动通信有限公司 Vein collection method and related products
CN110298261A (en) * 2019-06-06 2019-10-01 Oppo广东移动通信有限公司 Vein identification method and Related product
CN110298261B (en) * 2019-06-06 2021-06-01 Oppo广东移动通信有限公司 Vein identification method and related product
CN110533010A (en) * 2019-10-10 2019-12-03 中国计量大学 Adaptive light source finger vein image acquisition system

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