CN202306586U - Water-soaked finger print and palm print acquiring device - Google Patents
Water-soaked finger print and palm print acquiring device Download PDFInfo
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- CN202306586U CN202306586U CN2011204253881U CN201120425388U CN202306586U CN 202306586 U CN202306586 U CN 202306586U CN 2011204253881 U CN2011204253881 U CN 2011204253881U CN 201120425388 U CN201120425388 U CN 201120425388U CN 202306586 U CN202306586 U CN 202306586U
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Abstract
The utility model relates to a water-soaked finger print and palm print acquiring device, which comprises a light source, a prism and a receiving system, wherein the receiving system comprises a lens and an image receiver; the prism comprises a light incidence surface, an image output surface and an acquiring surface; light rays emitted by the light source enter the prism through the light incidence surface and are irradiated onto an acquiring surface of palm prints which is contacted with the prism for scattering; a part of scattered light rays are emitted through an image output surface, and are imaged onto the image receiver through a lens; light rays which enter the lens and are coincided with the optical axis of the lens are transmitted in the prism; and an included angle A between a trajectory L1 which intersects with the acquiring surface and the normal line L2 of the acquiring surface is larger than a critical angle B1 of light emitted from a glass medium into water, and is smaller than a critical angle B2 of light emitted from the glass medium into a finger skin and grease mixing medium. Due to the adoption of the water-soaked finger print and palm print acquiring device, the problem of fuzzy finger and palm imaging under the condition of high wetness and water soaking is solved effectively on the premise of not causing image detail loss.
Description
Technical field
The utility model belongs to the optical instrument technical field, relates to a kind of fingers and palms line Acquisition Instrument, particularly a kind of immersion fingers and palms line harvester.
Background technology
People's fingers and palms line quality and collection environment all have very big influence to the collecting work of fingers and palms line appearance, for example do situation such as finger, wet finger, dirty hand.Moist, sombre collection environment; All fingers and palms line acquisition technique has been made very high requirement; Particularly under some special environment, when gathering the fingers and palms line, often to gather in the face of the finger of just having washed that was perhaps drenched by water; The image of fingers and palms line appearance collection normally blurs in this case, and the lines contrast is very poor.
Also there is now certain methods to solve that immersion finger fingers and palms print image is fuzzy, the problem of lines poor contrast, as reducing brightness of illumination and the method through electronics Flame Image Process enhancing contrast ratio.But these two kinds of methods can only be alleviated the problem of lines poor contrast, all can't tackle the problem at its root, and particularly use the electronics Flame Image Process to come the method for enhancing contrast can cause the loss of detail of image, thereby have reduced the resolution of fingers and palms line appearance.
Summary of the invention
The technical matters that the utility model will solve provides a kind of immersion fingers and palms print image that under the prerequisite that does not influence resolution, improves and gathers the immersion fingers and palms line harvester of sharpness.
In order to solve the problems of the technologies described above, the immersion fingers and palms line harvester of the utility model comprises light source, prism, receiving system; Said receiving system comprises camera lens and picture receiver; Prism comprises light entrance face, image output face, collection face; The light that light source sends gets into prism through light entrance face and is radiated at the collection face generation scattering that palmmprint contacts with prism, and the part light of scattering passes through image output face outgoing, through lens imaging on picture receiver; The light that gets into camera lens and overlaps with camera lens optical axis in prism, propagate and with the crossing trajectory L of collection face
1, with the face of collection normal L
2Between included angle A shine the critical angle B the water greater than light from glass medium
1, and shine the critical angle B of finger skin and grease blending agent from glass medium less than light
2
The utility model because get into camera lens and the light that overlaps with camera lens optical axis is propagated in prism and with the crossing trajectory L of collection face
1, with the face of collection normal L
2Between included angle A shine the critical angle B the water greater than light from glass medium
1, and shine the critical angle B of finger skin and grease blending agent from glass medium less than light
2, according to the principle of total reflection, light can avoid the light of water generation scattering to mix with the fingers and palms print image through the collection face generation total reflection of water is arranged thus; Do not cause image detail loss, thereby reducing under the prerequisite of fingers and palms line appearance resolution, solving the problem of finger, palm image blur under the situation of very moistening, immersion effectively.
Said light source is the paster monochromatic LED, and its centre wavelength is 0.53 μ m; Prism is the right-angle prism of a ZF5 material, and collection face is the inclined-plane of right-angle prism, and light entrance face and image output face are respectively two right angle faces of right-angle prism, and collection face and image output face angle are 52.1 °～56.6 °; Light entrance face is parallel with the optical axis of camera lens, and the image output face is vertical with the optical axis of camera lens.
Said light source is the paster monochromatic LED, and centre wavelength is 0.53 μ m; Prism is the right-angled trapezium prism of a LAK8 material, and this right-angled trapezium prism comprises light entrance face, collection face, image output face and interior reflective surface; Light entrance face is the upper bottom surface of right-angled trapezium prism, and collection face is the bottom surface of right-angled trapezium prism, and interior reflective surface is the inclined-plane of right-angled trapezium prism, the right angle face of image output face right-angled trapezium prism; Collection face is 73.75 degree with the angle of interior reflective surface; Light entrance face and collection face are parallel to the optical axis of camera lens, and the image output face is perpendicular to the optical axis of camera lens.
The utility model also comprises background surfaces; Background surfaces again by image output face outgoing, on picture receiver, becomes the background of palmprint image through lens imaging through the total reflection of collection face.
Said background surfaces is a black.
The utility model has increased a black background face on prism, the common palmprint image that constitutes a width of cloth black background, white palmmprint lines of background and palmmprint.Because background surfaces is a black; Can play photoextinction; The gray scale of its imaging is constant; And the scattered energy of palmmprint lines can improve along with the brightness of light source and increase, thereby through the brightness of adjustment light source the gray scale of palmmprint lines imaging is uprised, and can effectively improve the contrast of palmprint image.BMP image for one 8 of outputs; The gradation of image grade is 256 grades, and the gray scale of black background can be infinitely close to 0, and palmmprint lines image can be infinitely near 255; Therefore contrast can be accomplished infinity in theory; But general background gray scale can be adjusted to 1～5, and palmmprint lines gray scale is adjusted to 250～255, so the contrast of background and fingerprint lines was easy to accomplish 1: 50.
Said light source is the paster monochromatic LED, and its centre wavelength is 0.53 μ m; Prism is that the right angle with right-angle prism of a ZF5 material cuts away the Dove prism that obtains; Light entrance face is the upper bottom surface of Dove prism; Collection face is the bottom surface of Dove prism; Background surfaces and image output face are respectively two right angle faces of right-angle prism, and collection face is 52.1 °～56.6 ° with image output face angle; Background surfaces is parallel with the optical axis of camera lens, and the image output face is vertical with the optical axis of camera lens.
Said light source is the paster monochromatic LED, and centre wavelength is 0.53 μ m, and prism is the Dove prism of LAK8 material; Light entrance face is the upper bottom surface of Dove prism, and collection face is the bottom surface of Dove prism, and background surfaces and image output face are respectively two inclined-planes of Dove prism; Collection face is 63.3 degree with the angle of image output face, and collection face is 36.7 degree with the angle of background surfaces; Background surfaces is parallel to the optical axis of camera lens.
Described camera lens is two telecentric mirror heads.
Because receiving system adopts two telecentric mirror heads; The light of image output face outgoing becomes directional light through camera lens; Not only can effectively correct the trapezoidal projection distortion of optical system medium dip object plane imaging, and can guarantee each position of collection face finger print IMAQ that can both effectively soak.
The utility model can also comprise the light path of turning back; After the light path of turning back is turned back, incide receiving system by the light of image output face outgoing.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is done further explain.
Fig. 1 is immersion fingers and palms line harvester embodiment 1 structural representation of the utility model.
Fig. 2 is immersion fingers and palms line harvester embodiment 2 structural representations of the utility model.
Fig. 3 is immersion fingers and palms line harvester embodiment 3 structural representations of the utility model.
Fig. 4 is immersion fingers and palms line harvester embodiment 4 structural representations of the utility model.
Fig. 5 is immersion fingers and palms line harvester embodiment 5 structural representations of the utility model.
Embodiment
According to the total reflection law:
sin(I)*n＝sin(I’)*n’ (1)
I is an incident angle, and n is the incident direction medium refraction index, and I ' is the refraction angle, and n ' is the refractive direction medium refraction index.When total reflection takes place the time, I '=90, then
Critical angle I=arcsin (n '/n). (2)
Can obtain light according to critical angle formula (2) and shine the critical angle B the water from glass medium
1Shine the critical angle B of finger skin and grease blending agent from glass medium with light
2:
B
1=arcsin (n
Water/ n
Prism) (3)
B
2=arcsin (n
Finger/ n
Prism) (4)
n
WaterRefractive index for water; n
PrismRefractive index for prism; n
FingerFor finger skin, high-quality potpourri refractive index.
For fingers and palms line appearance can mask water when gathering the fingers and palms line, and people's finger can be formed images, the structural relation between the utility model camera lens and the prism satisfies formula (5):
B
1＜A＜B
2 (5)
Wherein A propagate in prism for the light that gets into camera lens and overlaps with camera lens optical axis and with the crossing trajectory L of collection face
1, with the face of collection normal L
2Between angle.
As shown in Figure 1, the immersion fingers and palms line harvester of the utility model comprises light source 1, prism 2, receiving system 4; Said receiving system 4 comprises camera lens 4.1 and picture receiver 4.3; Prism 2 comprises light entrance face 2.1, image output face 2.4, collection face 2.3.Said light source 1 is monochromatic backlight, and centre wavelength is 0.53 μ m.Prism 2 is right-angle prisms, and collection face 2.3 is the inclined-plane of right-angle prism; Light entrance face 2.1 and image output face 2.4 are respectively two right angle faces of right-angle prism; Light entrance face 2.1 (light entrance face also is a background surfaces simultaneously) is parallel with the optical axis of camera lens 4.1, and image output face 2.4. is vertical with the optical axis of camera lens 4.1, and A is the optical axis and the face of collection normal L of camera lens 4.1
2Between angle.Prism 2 materials are ZF5, and its refractive index when wavelength is 0.53 μ m is 1.749, and the refractive index of finger skin and grease blending agent is 1.46 μ m～1.55 μ m; The refractive index of water is 1.33 μ m, because hand is after getting wet, the grease on the finger skin must some be blended in the water, and the refractive index of Gu Shui is a variable, is roughly 1.33 μ m～1.38 μ m; Can calculate 56.6 ° of 52.1 ° of ∠ A ∠ by formula (3), (4), (5), then gather face 2.3 and image output face 2.4 angles and can be the unspecified angle value between 52.1 °～56.6 °.
Camera lens 4.1 employing multiplying powers are two telecentric mirror heads of-0.1855.Picture receiver 4.3 adopts MT9M001 type CMOS.
As shown in Figure 2, the immersion fingers and palms line harvester of the utility model comprises light source 1, prism 2, receiving system 4; Said receiving system 4 comprises camera lens 4.1 and picture receiver 4.3; Prism 2 comprises light entrance face 2.1, background surfaces 2.2, image output face 2.4, collection face 2.3.Said light source 1 is a paster monochromatic LED array, and centre wavelength is 0.53 μ m.Prism 2 is the Dove prisms that the right angle of right-angle prism is cut away, and light entrance face 2.1 is the upper bottom surface of Dove prism, and collection face 2.3 is the inclined-plane of Dove prism.Background surfaces 2.2 and image output face 2.4 are respectively two inclined-planes of Dove prism; The background surfaces 2.2 of black (blacking lacquer painting) is parallel with the optical axis of camera lens 4.1, and image output face 2.4. is vertical with the optical axis of camera lens 4.1, and A is the optical axis and the face of collection normal L of camera lens 4.1
2Between angle.Prism 2 materials are ZF5, and it is that the refractive index that 0.53 μ m is is 1.749 at wavelength, and the refractive index of finger skin and grease blending agent is 1.46 μ m～1.55 μ m; The refractive index of water is roughly 1.33 μ m～1.38 μ m.Can calculate 56.6 ° of 52.1 ° of ∠ A ∠ by formula (5), then gather face 2.3 and image output face 2.4 angles and can be the unspecified angle value between 52.1 °～56.6 °.
Camera lens 4.1 employing multiplying powers are two telecentric mirror heads of-0.1855.Picture receiver 4.3 adopts MT9M001 type CMOS.
The background surfaces 2.2 of black is through collection face generation total reflection, and camera lens 4.1 images in the background surfaces 2.2 of black on the COMS, and this moment, image was shown as the black bottom surface; The monochromatic source scattering, when palm was restrained collection face 2.3, light can't see the picture of background surfaces 2.2 in palmmprint and the 2.3 contact portion generation scatterings of collection face, on screen, is shown as bright fringes, formed sharp contrast with the black bottom surface.According to the principle of total reflection, light can avoid the light of water generation scattering to mix with the fingers and palms print image through there being the collection face of water that total reflection also takes place thus, has solved the finger after the immersion, the problem of palm image blur.Because 4.3 one-tenth black background pictures of picture receiver so light intensity changes the variation that can not cause black bottom surface gray scale, can improve the contrast between background and the fingerprint lines through the brightness of regulating light source.
As shown in Figure 3, prism 2 materials are LAK8, and its refractive index when wavelength is 0.53 μ m is 1.72, and the refractive index of finger skin and grease blending agent is 1.46 μ m～1.55 μ m; The refractive index of water is roughly 1.33 μ m～1.38 μ m, and light source 1 is the paster monochromatic LED, and centre wavelength is 0.53 μ m; 4.1 be camera lens; 4.3 be picture receiver; Prism 2 is Dove prisms; Light entrance face 2.1 is upper bottom surface and the bottom surfaces that are respectively Dove prism with collection face 2.3, and image output face 2.4 and background surfaces 2.2 are respectively two inclined-planes of Dove prism, and background surfaces 2.4 is parallel with the optical axis of camera lens 4.1.A gets into camera lens 4.1 and trajectory L that the light that overlaps with camera lens optical axis is propagated in prism 2
1With the face of collection normal L
2Between angle.Collection face 2.3 is 63.3 degree with the angle of image output face 2.4, and collection face 2.3 is 36.7 degree with the angle of background surfaces 2.2.Camera lens 4.1 is that a multiplying power is-0.165 camera lens, and that picture receiver 4.1 uses is MT9M001 type CMOS.During work, the trajectory L that entering camera lens and the light that overlaps with camera lens optical axis are propagated in prism 2
1With the face of collection normal L
2Between included angle A be 57.5 degree, background surfaces 2.2 through 2.3 total reflections of collection faces after with fingerprint image simultaneously with the incident angle of 5.8 degree through image output face 2.4 outgoing, emergence angle is 10 degree, is imaged on the picture receiver 4.3 through camera lens 4.1 then.
Embodiment 4
As shown in Figure 4; The structure of prism 2 is identical with embodiment 5; Camera lens 4.1 is also identical with embodiment 3 with picture receiver 4.; Just added a slice catoptron 3.1 light path of turning back in the light path between prism 2 image output faces 2.4 and camera lens 4.1, purpose is to work as distance between camera lens 4.1 and the prism 2 long the time, can dwindle the volume of entire equipment.
Embodiment 5
As shown in Figure 5, prism 2 materials are LAK8, and its refractive index when wavelength is 0.53 μ m is 1.72, and the refractive index of finger skin and grease blending agent is 1.46 μ m～1.55 μ m; The refractive index of water is roughly 1.33 μ m～1.38 μ m, and light source 1 is the paster monochromatic LED, and centre wavelength is 0.53 μ m; 4.1 be camera lens, the 4.3rd, picture receiver.Prism 2 is right-angled trapezium prisms, and light entrance face 2.1 and collection face 2.3 are respectively the upper bottom surface and the bottom surface of right-angled trapezium prism, and interior reflective surface 2.5 is inclined-planes of right-angled trapezium prism, and image output face 2.4 is right angle faces of right-angled trapezium prism.Light entrance face 2.1 also is a background surfaces simultaneously.Collection face 2.3 is 73.75 degree with the angle of interior reflective surface 2.5, and interior reflective surface 2.5 is 106.25 degree with the angle of light entrance face 2.1, and image output face 2.4 intersects vertically respectively with collection face 2.3, light entrance face 2.1.Light L
1After interior reflective surface 2.5 reflection by image output face 2.4 outgoing, get into then camera lens 4.1 and with the optical axis coincidence of camera lens 4.1, L
1Normal L with collection face 4.3
2Between angle be A.Camera lens 4.1 is that a multiplying power is-0.165 camera lens, and that picture receiver 4.3 uses is MT9M001 type CMOS.During work; A is 57.5 degree; The image of background surfaces (light entrance face 2.1) is earlier through image output face 2.4 total reflections; Reflected by interior reflective surface 2.5 jointly through 2.3 total reflections of collection face and fingerprint image then,, be imaged on the picture receiver 4.3 through camera lens 4.1 perpendicular to image output face 2.4 outgoing.
The utility model instantaneous acquiring forms images immediately, and the gray scale contrast of black background and fingerprint lines is big, and resolution is high, has not only solved the finger after the immersion, the problem of palm image blur, has also solved under the bright background scattering to the problem that influences of image quality.
The foregoing description only is the utility model optimized technical scheme, does not constitute the restriction to the utility model protection domain.Thereby every any simple deformation of on the utility model claim 1 technical scheme basis, making, all within the utility model intention protection domain.
Claims (9)
1. an immersion fingers and palms line harvester is characterized in that comprising light source (1), prism (2), receiving system (4); Said receiving system (4) comprises camera lens (4.1) and picture receiver (4.3); Prism (2) comprises light entrance face (2.1), image output face (2.4), collection face (2.3); The light that light source (1) sends gets into prism (2) through light entrance face (2.1) and is radiated at collection face (2.3) the generation scattering that palmmprint contacts with prism; The part light of scattering is imaged on the picture receiver (4.3) through camera lens (4.1) through image output face (2.4) outgoing; The light that gets into camera lens (4.1) and overlaps with camera lens optical axis in prism (2), propagate and with the crossing trajectory L of collection face (2.3)
1, with the face of collection normal L
2Between included angle A shine the critical angle B the water greater than light from glass medium
1, and shine the critical angle B of finger skin and grease blending agent from glass medium less than light
2
2. immersion fingers and palms line harvester according to claim 1 is characterized in that said light source (1) is the paster monochromatic LED, and its centre wavelength is 0.53 μ m; Prism (2) is the right-angle prism of a ZF5 material; Collection face (2.3) is the inclined-plane of right-angle prism; Light entrance face (2.1) and image output face (2.4) are respectively two right angle faces of right-angle prism, and collection face (2.3) is 52.1 °～56.6 ° with image output face (2.4) angle; Light entrance face (2.1) is parallel with camera lens (4.1) optical axis, and image output face (2.4) is vertical with the optical axis of camera lens (4.1).
3. immersion fingers and palms line harvester according to claim 1 is characterized in that said light source (1) is the paster monochromatic LED, and centre wavelength is 0.53 μ m; Prism (2) is the right-angled trapezium prism of a LAK8 material, and this right-angled trapezium prism comprises light entrance face (2.1), collection face (2.3), image output face (2.4) and interior reflective surface (2.5); Light entrance face (2.1) is the upper bottom surface of right-angled trapezium prism, and collection face (2.3) is the bottom surface of right-angled trapezium prism, and interior reflective surface (2.5) is the inclined-plane of right-angled trapezium prism, the right angle face of image output face (2.4) right-angled trapezium prism; Collection face (2.3) is 73.75 degree with the angle of interior reflective surface (2.5); Light entrance face (2.1) and collection face (2.3) are parallel to the optical axis of camera lens (4.1), and image output face (2.4) is perpendicular to the optical axis of camera lens (4.1).
4. immersion fingers and palms line harvester according to claim 1 is characterized in that said prism (2) also comprises background surfaces (2.2); Background surfaces (2.2) by image output face (2.4) outgoing, is imaged on the picture receiver (4.3) through camera lens (4.1) through collection face (2.3) total reflection again, becomes the background of palmprint image.
5. immersion fingers and palms line harvester according to claim 4 is characterized in that said background surfaces (2.2) is black.
6. immersion fingers and palms line harvester according to claim 5 is characterized in that said light source (1) is the paster monochromatic LED, and its centre wavelength is 0.53 μ m; Prism (2) is that the right angle with right-angle prism of a ZF5 material cuts away the Dove prism that obtains; Light entrance face (2.1) is the upper bottom surface of Dove prism; Collection face (2.3) is the bottom surface of Dove prism; Background surfaces (2.2) and image output face (2.4) are respectively two right angle faces of right-angle prism, and collection face (2.3) is 52.1 °～56.6 ° with image output face (2.4) angle; Background surfaces (2.2) is parallel with the optical axis of camera lens (4.1), and image output face (2.4) is vertical with the optical axis of camera lens (4.1).
7. immersion fingers and palms line harvester according to claim 5 is characterized in that said light source (1) is the paster monochromatic LED, and centre wavelength is 0.53 μ m, and prism (2) is the Dove prism of LAK8 material; Light entrance face (2.1) is the upper bottom surface of Dove prism, and collection face (2.3) is the bottom surface of Dove prism, and background surfaces (2.2) and image output face (2.4) are respectively two inclined-planes of Dove prism; Collection face (2.3) is 63.3 degree with the angle of image output face (2.4), and collection face (2.3) is 36.7 degree with the angle of background surfaces (2.2); Background surfaces (2.2) is parallel to the optical axis of camera lens (4.1).
8. immersion fingers and palms line harvester according to claim 1 is characterized in that described camera lens (4.1) is two telecentric mirror heads.
9. immersion fingers and palms line harvester according to claim 1 is characterized in that also comprising the light path of turning back; After the light path of turning back is turned back, incide receiving system (4) by the light of image output face (2.4) outgoing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204253881U CN202306586U (en) | 2011-11-01 | 2011-11-01 | Water-soaked finger print and palm print acquiring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204253881U CN202306586U (en) | 2011-11-01 | 2011-11-01 | Water-soaked finger print and palm print acquiring device |
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| CN202306586U true CN202306586U (en) | 2012-07-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102426648A (en) * | 2011-11-01 | 2012-04-25 | 长春方圆光电技术有限责任公司 | Finger and palm print instrument used for collection of soaked finger and palm prints |
| CN106203407A (en) * | 2016-08-31 | 2016-12-07 | 长春鸿达光电子与生物统计识别技术有限公司 | One has environment resistant light interference triangular prism and fingerprint collecting equipment |
| CN106461564A (en) * | 2014-06-27 | 2017-02-22 | 罗伯特·博世有限公司 | Device and method for checking windscreen wiper blades |
| CN109791612A (en) * | 2018-12-26 | 2019-05-21 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
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2011
- 2011-11-01 CN CN2011204253881U patent/CN202306586U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426648A (en) * | 2011-11-01 | 2012-04-25 | 长春方圆光电技术有限责任公司 | Finger and palm print instrument used for collection of soaked finger and palm prints |
| CN102426648B (en) * | 2011-11-01 | 2013-09-18 | 长春方圆光电技术有限责任公司 | Finger and palm print instrument used for collection of soaked finger and palm prints |
| CN106461564A (en) * | 2014-06-27 | 2017-02-22 | 罗伯特·博世有限公司 | Device and method for checking windscreen wiper blades |
| US10551324B2 (en) | 2014-06-27 | 2020-02-04 | Robert Bosch Gmbh | Device and method for checking windshield wiper blades |
| CN106203407A (en) * | 2016-08-31 | 2016-12-07 | 长春鸿达光电子与生物统计识别技术有限公司 | One has environment resistant light interference triangular prism and fingerprint collecting equipment |
| CN109791612A (en) * | 2018-12-26 | 2019-05-21 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN109791612B (en) * | 2018-12-26 | 2023-08-08 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
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