CN203552271U - System for obtaining complete palm vein image - Google Patents
System for obtaining complete palm vein image Download PDFInfo
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- CN203552271U CN203552271U CN201320327691.7U CN201320327691U CN203552271U CN 203552271 U CN203552271 U CN 203552271U CN 201320327691 U CN201320327691 U CN 201320327691U CN 203552271 U CN203552271 U CN 203552271U
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- infrared led
- light
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- palm vein
- vein image
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Abstract
The utility model discloses a system for obtaining a complete palm vein image. The system comprises a first near-infrared LED (light emitting diode), a second near-infrared LED, a third near-infrared LED, a circuit board, a light condensation cylinder, ground glass, black shading paper, an optical imaging system, a visible-light filter and an image sensor, wherein the first near-infrared LED, the second near-infrared LED and third near-infrared LED are arranged on the bottom face of the light condensation cylinder; the ground glass is arranged on the top face of the light condensation cylinder; the optical imaging system comprises a first lens and a second lens; and the light condensation cylinder, the ground glass, the black shading paper, the optical imaging system, the visible-light filter and the image sensor are placed on the same optical axis sequentially. According to the system, a light source is simple in structure; the cost is low; the purchase and fabrication are facilitated; the light condensation cylinder designed ingeniously allows emergent light to be reflected for many times to avoid light intensity loss; uniform illumination light is obtained; the imaging contrast of a vein is increased; and the complete palm vein image is obtained.
Description
Technical field
The utility model relates to the application of near infrared imaging technology aspect human-body biological identification, relates in particular to a kind of system of obtaining complete human body palm vein image.
Background technology
Palm vein identification is a kind of new biometrics identification technology, is mainly used in personal identification and differentiates.Fingerprint with people is compared, and finger vena not only has height uniqueness, and live body, antifalsification and feature stability are more outstanding, have higher security aspect authentication.Proprietary vein is all different, even the closely similar twinborn vein image of appearance is also different, and this species diversity he (she) can not disappear in life.
Identification based on palm vein mainly has the following advantages: (1) palm vein is positioned under palm epidermis, and difficulty is stolen and forges, and has very high security; (2) palm vein comprises abundant personal information, has very high status differentiation ability; (3) can be by cordless imaging under near infrared light, recognition method health, safe, susceptible to user acceptance.In the safety of information-based and networking, be widely used.The mode of using near infrared light to obtain palm vein image at present has reflectometry and transmission beam method.
Reflectometry refers to that near-infrared light source and imageing sensor are in the same side of palm, and the irradiation that near-infrared light source sends is at palm surface, and reflected light and part scattered light return along the direction of incident, by the imageing sensor of the same side, are received and be passed to display.Advantage is: the volume and the space that have reduced equipment; The power of lighting source is relatively little; Easily obtain the vein image of whole palms.Shortcoming is: the reflected light of palm surface causes interference to vein imaging, has reduced the contrast of image.
Transmission beam method refers to that near-infrared light source and imageing sensor are in the both sides of palm, and the irradiation that near-infrared light source sends is at palm surface, and the transmitted light that passes palm portion is received and be passed to display by the imageing sensor of opposite side.Advantage is: overcome the impact of skin surface light in reflectometry, the contrast of regional area is well strengthened.Shortcoming is: the zones of different variable thickness sample of palm causes imaging inhomogeneous; The effect of relatively thin finger vena imaging is better, and the effect of the vein imaging of whole palm is poor.
But these two kinds of methods of utilizing near infrared to obtain human body palm vein image, exist following problem: reflectometry can obtain complete finger venous image, but the reflected light of palm surface disturbs imaging, has reduced the contrast of image.Transmission beam method can be obtained part vein image comparatively clearly, but palm diverse location is in uneven thickness, so absorbed not of uniform size causing, causes the light intensity of near infrared light after palm also inhomogeneous, the contrast of the image being received by imageing sensor declines.Cannot obtain whole palm vein, thereby unique point is few, in bio-identification, causes erroneous judgement.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of system of obtaining complete human body palm vein image is provided.
Obtain complete palm vein image system and comprise the first near-infrared LED, the second near-infrared LED, the 3rd near-infrared LED, circuit board, light collecting barrel, frosted glass, black light-shielding sheet, first lens, the second lens, visible ray filter plate, imageing sensor; The bottom surface of light collecting barrel is provided with the first near-infrared LED, the second near-infrared LED, the 3rd near-infrared LED, the end face of light collecting barrel is provided with frosted glass, and light collecting barrel, frosted glass, black light-shielding sheet, first lens, the second lens, visible ray filter plate, imageing sensor are placed on same optical axis successively.
Described light collecting barrel is that the level crossing by high reflectance combines, its length * wide * height is: 240mm * 150mm * 50mm, level crossing with same reflectivity on length direction is divided into identical first area, second area, the 3rd region, and each zone length is respectively 80mm.
The wavelength of the first described near-infrared LED, the second near-infrared LED, the 3rd near-infrared LED is 850nm.
The combined focal length of described first lens, the second lens is 2.8 ~ 12mm, and maximum ring number is 1.4.
Described imageing sensor is cmos sensor or ccd sensor.
The beneficial effects of the utility model are: the light-source structure of design is simple, easily experimental implementation; Light source is used the LED that wavelength is 850nm, convenient purchase simultaneously with low cost; The rectangle light collecting barrel of ingehious design, easily regulates the size of light intensity; Airtight light collecting barrel near infrared light multiple reflections, finally concentrates from top outgoing, can avoid intensity loss; Another effect of rectangle light collecting barrel is to obtain uniform illumination light, improves the image contrast of vein blood vessel, obtains the vein image of full palm.Black light-shielding sheet can block the stray light that does not pass through palm.
Accompanying drawing explanation
Fig. 1 is the structural representation that obtains the system of palm vein infrared image;
Fig. 2 is the structural representation of light collecting barrel of the present utility model;
?in figure, the first near-infrared LED 1, the second near-infrared LED 2, the 3rd near-infrared LED 3, circuit board 4, light collecting barrel 5, frosted glass 6, black light-shielding sheet 7, first lens 8, the second lens 9, visible ray filter plate 10, imageing sensor 11, first area 12, second area 13, the 3rd region 14.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1, 2, obtain complete palm vein image system and comprise the first near-infrared LED (1), the second near-infrared LED 2, the 3rd near-infrared LED 3, circuit board 4, light collecting barrel 5, frosted glass 6, black light-shielding sheet 7, first lens 8, the second lens 9, visible ray filter plate 10, imageing sensor 11; The bottom surface of light collecting barrel 5 is provided with the first near-infrared LED 1, the second near-infrared LED 2, the 3rd near-infrared LED 3, the end face of light collecting barrel 5 is provided with frosted glass 6, and light collecting barrel 5, frosted glass 6, black light-shielding sheet 7, first lens 8, the second lens 9, visible ray filter plate 10, imageing sensor 11 are placed on same optical axis successively.
Described light collecting barrel 5 is that the level crossing by high reflectance combines, its length * wide * height is: 240mm * 150mm * 50mm, level crossing with same reflectivity on length direction is divided into first area 12, second area 13, the 3rd region 14 that length is identical, and each zone length size is 80mm.
The wavelength of the first described near-infrared LED 1, the second near-infrared LED 2, the 3rd near-infrared LED 3 is 850nm.
Described first lens 8, the combined focal length of the second lens 9 are 2.8 ~ 12mm, and maximum ring number is 1.4.
Described imageing sensor 11 is cmos sensor or ccd sensor.
The described method of obtaining complete palm vein image is: human body palm in uneven thickness, cause transmission beam method in first area 12, second area 13, the contrast of the image that the 3rd region 14 obtains differs larger, while adopting regional exposure mode to obtain complete palm vein image, for the less finger part of thickness, open the first near-infrared LED 1, close the second near-infrared LED 2, the 3rd near-infrared LED 3, light intensity now a little less than, near infrared light is multiple reflections in light collecting barrel 5, see through successively again frosted glass 6 and black light-shielding sheet 7, black light-shielding sheet 7 can block the near infrared light not being radiated on palm, avoid this part near infrared light directly to enter in imageing sensor and to image and cause interference, the near infrared light of outgoing impinges upon on palm, near infrared light process first lens 8 from palm transmission, after the second lens 9, form directional light, pass through again the effect of visible ray filter plate 10, filtering visible ray also allows near infrared light pass through, finally by imageing sensor, received and be presented on display screen, same method, for the thicker part in the centre of the palm and wrist place, open successively the second near-infrared LED 2, the 3rd near-infrared LED 3, obtain the image that exposure gathers successively, by the first near-infrared LED 1, the second near-infrared LED 2, the image that the 3rd 3 three kinds of near-infrared LEDs light intensity obtains strengthens processing, extract local vein image clearly, finally by crossing weighting gradual change, process, obtain complete palm vein image clearly.
Embodiment:
Human body palm is placed between black light-shielding sheet, first lens, allows the centre of the palm drop on optical axis, and the plane in the centre of the palm is parallel with lens plane.Imageing sensor is connected on computer, adjusts aperture size, adjusting focal length size, opens the first near-infrared LED in first area, closes the LED in second area and the 3rd region, controls voltage swing, obtains the image under this light intensity.In like manner, open successively the near-infrared LED in second area near-infrared LED and the 3rd region, obtain respectively the image under these two light intensity.Then obtained image is adopted to adaptive equalization image enhancement processing, improve the contrast of image, outstanding palm vein blood vessel.
Image after figure image intensifying is fused into piece image by linear, additive, and recycling weighting gradual change splicing removes resulting image overlapping portion, obtains complete palm vein image clearly.
Claims (5)
1. obtain a complete palm vein image system, it is characterized in that: comprise the first near-infrared LED (1), the second near-infrared LED (2), the 3rd near-infrared LED (3), circuit board (4), light collecting barrel (5), frosted glass (6), black light-shielding sheet (7), first lens (8), the second lens (9), visible ray filter plate (10), imageing sensor (11); The bottom surface of light collecting barrel (5) is provided with the first near-infrared LED (1), the second near-infrared LED (2), (3) three kinds of different LED light sources of the 3rd near-infrared LED, the end face of light collecting barrel (5) is provided with frosted glass (6), and light collecting barrel (5), frosted glass (6), black light-shielding sheet (7), first lens (8), the second lens (9), visible ray filter plate (10), imageing sensor (11) are placed on same optical axis successively.
2. according to a kind of system of obtaining complete palm vein image described in right 1, it is characterized in that: the wavelength of described the first near-infrared LED (1), the second near-infrared LED (2), the 3rd near-infrared LED (3) is 850nm.
3. according to a kind of system of obtaining complete palm vein image described in right 1, it is characterized in that: described light collecting barrel (5) is that the level crossing by high reflectance combines, its length * wide * height is: 240mm * 150mm * 50mm, level crossing with same reflectivity on length direction is divided into the first area that length is identical (12), second area (13), the 3rd region (14), and each zone length size is 80mm.
4. according to a kind of system of obtaining complete palm vein image described in right 1, it is characterized in that: the combined focal length of first lens (8), the second lens (9) is 2.8 ~ 12mm, and maximum ring number is 1.4.
5. according to a kind of system of obtaining complete palm vein image described in right 1, it is characterized in that: described imageing sensor (11) is cmos sensor or ccd sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320327691.7U CN203552271U (en) | 2013-06-07 | 2013-06-07 | System for obtaining complete palm vein image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320327691.7U CN203552271U (en) | 2013-06-07 | 2013-06-07 | System for obtaining complete palm vein image |
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| Publication Number | Publication Date |
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| CN203552271U true CN203552271U (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320327691.7U Expired - Fee Related CN203552271U (en) | 2013-06-07 | 2013-06-07 | System for obtaining complete palm vein image |
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| CN (1) | CN203552271U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103258199A (en) * | 2013-06-07 | 2013-08-21 | 浙江大学 | System and method for obtaining complete palm vein image |
| CN107748872A (en) * | 2017-10-27 | 2018-03-02 | 孙洪军 | A kind of IMAQ is clear and comprehensive intelligent palm vein identification device |
| US10679081B2 (en) | 2015-07-29 | 2020-06-09 | Industrial Technology Research Institute | Biometric device and wearable carrier |
-
2013
- 2013-06-07 CN CN201320327691.7U patent/CN203552271U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103258199A (en) * | 2013-06-07 | 2013-08-21 | 浙江大学 | System and method for obtaining complete palm vein image |
| US10679081B2 (en) | 2015-07-29 | 2020-06-09 | Industrial Technology Research Institute | Biometric device and wearable carrier |
| CN107748872A (en) * | 2017-10-27 | 2018-03-02 | 孙洪军 | A kind of IMAQ is clear and comprehensive intelligent palm vein identification device |
| CN107748872B (en) * | 2017-10-27 | 2020-05-08 | 南京振轩新能源科技有限公司 | Clear and comprehensive intelligent palm vein recognition device of image acquisition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20170607 |