CN202306587U - Dark background palm print collecting device - Google Patents
Dark background palm print collecting device Download PDFInfo
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- CN202306587U CN202306587U CN2011204253928U CN201120425392U CN202306587U CN 202306587 U CN202306587 U CN 202306587U CN 2011204253928 U CN2011204253928 U CN 2011204253928U CN 201120425392 U CN201120425392 U CN 201120425392U CN 202306587 U CN202306587 U CN 202306587U
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Abstract
The utility model relates to a dark background palm print collecting device, comprising 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, a collecting surface and a background surface; the black background surface is totally reflected through the collecting surface, emergent by the image output surface and imaged on the image receiver through the lens so as to become a background of a palm print image; and the light emitted by the light source is incident into the prism through the light incidence surface and irradiates on the collecting surface, on which the palm is in contact with the prism, for scattering, and a portion of scattered light is emergent through the image output surface and is imaged on the image receiver through the lens. According to the utility model, the black background surface is added on the prism, so that the background and the palm print jointly form a palm print image with a black background and white palm print lines. Owing to the back background surface, the imaging grey level is constant, and the grey level for imaging the palm print lines can be increased through adjusting the brightness of the light source, so that the contrast ratio of the palm print image can be effectively increased.
Description
Technical field
The utility model belongs to the precision optical instrument technical field, relates to a kind of palmmprint harvester, particularly a kind of dark background live body palmmprint harvester.
Background technology
Traditional fingerprint acquisition instrument generally is made up of prism, light source, lens combination, imageing sensor.Said prism comprises that a collection is with light entrance face, an image output face, a collection face; The light that light source sends gets into prism through light entrance face, and in the face of collection generation total reflection, output face shines the lens combination with certain enlargement ratio through image, on imageing sensor, becomes bright background image at last; After palm was restrained collection face, palmmprint part light generation scattering was shown as dark fringe on sensor.This kind method is because its picking rate is fast, and resolution, contrast are higher relatively, become the main flow mode of live body palmmprint acquisition system.All products of the same type of existing market form images and are all bright background, black streaking; This just has in the face of a problem: the brightness variation of the brightness of background and palmmprint lines image is in the same way; That is to say to regulate from light source and go up the contrast that well increases palmmprint lines image and background; Can only improve contrast through the way that later image is handled, but some detailed information that can lose image.
Summary of the invention
The technical matters that the utility model will solve provides a kind of dark background palmmprint harvester that can effectively improve palmmprint images acquired contrast.
In order to solve the problems of the technologies described above, the dark background palmmprint 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 and background surfaces; The background surfaces of black 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; 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 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.
The dark background palmmprint harvester of the utility model can also comprise the light path of turning back; After the light path of turning back is repeatedly turned back, incide receiving system by the light of image output face outgoing.
Said optical routing first catoptron of turning back, second catoptron constitute; Light by image output face outgoing shines second catoptron after first mirror reflects, after second mirror reflects, inciding receiving system.
Said optical routing first catoptron of turning back, second catoptron, the 3rd catoptron and the 4th catoptron constitute; Light rays by image output face outgoing incides receiving system after first catoptron, second catoptron, the 3rd catoptron and the 4th mirror reflects.
Because the palmmprint collection requires collection face very big, if the light of image output face outgoing is directly received by receiving system, then the requirement of the camera lens aperture of receiving system is very big, and cost can be very high; The method that reduces camera lens aperture is the distance that widens between camera lens and prism, and this moment, system bulk can be very big, and feasibility is low.So the utility model is through the increase light path of turning back; Make light in certain volume through repeatedly turning back, be equivalent to the light very long segment distance of in very little space, having walked, reach the purpose that increases camera lens and prism pitch with this; Reduce system bulk, reduced cost.
Heating module can be installed in said prism both sides, dried to solve, wet hand getting collection situation different problems.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is done further explain.
Fig. 1 is dark background palmmprint harvester embodiment 1 structural representation of the utility model.
Fig. 2 is the utility model embodiment 2 structural representations.
Fig. 3 is the utility model embodiment 3 structural representations.
Fig. 4 is the left view of prism.
Embodiment
As shown in Figure 1, the dark background palmmprint harvester of the utility model comprises light source 1, prism 2, receiving system 4; Said prism 2 comprises light entrance face 2.1, image output face 2.4, collection face 2.3 and background surfaces 2.2.Background surfaces 2.2 japannings; The background surfaces 2.2 and the image output face 2.4 of prism 2 are distributed in collection face 2.3 both sides, and light entrance face 2.1 is positioned at collection face 2.3 opposites, and place in light source 1 next-door neighbour's prismatic light plane of incidence 2.1 outsides.Receiving system 4 is positioned on the image output face 2.4 beam projecting light paths; Receiving system 4 is made up of camera lens 4.1, web member 4.2 and picture receiver 4.3, and picture receiver 4.3 is fixedly connected with camera lens 4.1 through web member 4.2.The whole device of the utility model is fixed in the closure casing of a fixed size through metallic framework and other electronic devices and components.
The background surfaces 2.2 of black by image output face 2.4 outgoing, is imaged on the picture receiver 4.3 through camera lens 4.1 through 2.3 total reflections of collection face again, becomes the background of palmprint image; The light that light source 1 sends gets into prism 2 through light entrance face 2.1 and is radiated at the collection face 2.3 generation scatterings that palmmprint contacts with prism, and 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.
As shown in Figure 2, the dark background palmmprint harvester of the utility model comprises light source 1, prism 2, the light path 3 of turning back, receiving system 4; Said prism 2 comprises light entrance face 2.1, image output face 2.4, collection face 2.3 and background surfaces 2.2.Background surfaces 2.2 japannings; The background surfaces 2.2 and the image output face 2.4 of prism 2 are distributed in collection face 2.3 both sides, and light entrance face 2.1 is positioned at collection face 2.3 opposites, and place in light source 1 next-door neighbour's prismatic light plane of incidence 2.1 outsides.The light path of turning back 3 is made up of first catoptron 3.1, second catoptron 3.2 between image output face 2.4 and receiving system 4; Receiving system 4 is made up of camera lens 4.1, web member 4.2 and picture receiver 4.3, and picture receiver 4.3 is fixedly connected with camera lens 4.1 through web member 4.2.The whole device of the utility model is fixed in the closure casing of a fixed size through metallic framework and other electronic devices and components.Consider dried, wet hand getting collection situation different problems, as shown in Figure 4, the heating module 6 of may command open and close is installed on prism 2 both sides fixed heads 5.
The scattering of near infrared monochromatic source; Total reflections take place through collection face 2.3 in the background surfaces 2.2 of black, and through along light path fixing first catoptron 3.1, second catoptron 3.2, level is injected camera lens 4.1; Camera lens 4.1 images in the background surfaces 2.2 of black on the COMS; In collecting device, after the Flame Image Process of mainboard, through the USB2.0 interface data are imported in the computing machine immediately, this moment, image was shown as the black bottom surface; 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 dark background.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.
The dark background palmmprint harvester of the utility model comprises light source 1, prism 2, the light path 3 of turning back, receiving system 4; Said prism 2 comprises light entrance face 2.1, image output face 2.4, collection face 2.3 and background surfaces 2.1.Background surfaces 2.2 japannings; The background surfaces 2.2 and the image output face 2.4 of prism 2 are distributed in collection face 2.3 both sides, and light entrance face 2.1 is positioned at collection face 2.3 opposites, and place in the light source next-door neighbour prismatic light plane of incidence 2.1 outsides.The light path of turning back 3 is made up of first catoptron 3.1, second catoptron 3.1, the 3rd catoptron 3.3 and the 4th catoptron 3.4 between output face 2.4 of prism image and receiving system 4; Receiving system 4 is made up of camera lens 4.1, web member 4.2 and picture receiver 4.3, and picture receiver 4.3 is fixedly connected with camera lens 4.1 through web member 4.2.The whole device of the utility model is fixed in the closure casing of a fixed size through metallic framework and other electronic devices and components.Consider dried, wet hand getting collection situation different problems, as shown in Figure 4, the heating module 6 of may command open and close is installed on prism 2 both sides fixed heads 5.
The utility model instantaneous acquiring forms images immediately, and the gray scale contrast of background and fingerprint lines is big, and resolution is high, has solved under the bright background scattering to the problem that influences of image quality.
The utility model is not limited to above-mentioned embodiment, should be understood that, every any simple deformation of on the utility model claim technical scheme basis, making is all within the utility model intention protection domain.
Claims (5)
1. a dark background palmmprint harvester comprises light source (1), prism (2), receiving system (4); Said prism (2) comprises light entrance face (2.1), image output face (2.4), collection face (2.3); Receiving system (4) comprises camera lens (4.1) and picture receiver (4.3); It is characterized in that prism (2) also comprises background surfaces (2.2); The background surfaces of black logical (2.2) is crossed collection face (2.3) total reflection, by image output face (2.4) outgoing, is imaged on the picture receiver (4.3) through camera lens (4.1) again, becomes the background of palmprint image; 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.
2. dark background palmmprint harvester according to claim 1 is characterized in that also comprising the light path of turning back (3); After the light path of turning back (3) is repeatedly turned back, incide receiving system (4) by the light of image output face (2.4) outgoing.
3. dark background palmmprint harvester according to claim 2 is characterized in that the said light path of turning back (3) is made up of first catoptron (3.1), second catoptron (3.2); Light by image output face outgoing shines second catoptron (3.2) after first catoptron (3.1) reflection, after second catoptron (3.2) reflection, incide receiving system (4) again.
4. dark background palmmprint harvester according to claim 2 is characterized in that the said light path of turning back (3) is made up of first catoptron (3.1), second catoptron (3.1), the 3rd catoptron (3.3) and the 4th catoptron (3.4); Light rays by image output face outgoing incides receiving system (4) after first catoptron (3.1), second catoptron (3.2), the 3rd catoptron (3.3) and the 4th catoptron (3.4) reflection.
5. dark background palmmprint harvester according to claim 1 is characterized in that said prism (2) both sides installation heating module (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204253928U CN202306587U (en) | 2011-11-01 | 2011-11-01 | Dark background palm print collecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204253928U CN202306587U (en) | 2011-11-01 | 2011-11-01 | Dark background palm print collecting device |
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| Publication Number | Publication Date |
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| CN202306587U true CN202306587U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011204253928U Expired - Fee Related CN202306587U (en) | 2011-11-01 | 2011-11-01 | Dark background palm print collecting device |
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| CN (1) | CN202306587U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385699A (en) * | 2011-11-01 | 2012-03-21 | 长春方圆光电技术有限责任公司 | System for acquiring palmprint in dark background |
| CN106960194A (en) * | 2017-03-24 | 2017-07-18 | 徐晨 | A kind of vein identification device |
| CN109460741A (en) * | 2018-11-16 | 2019-03-12 | 青岛奥美克生物信息科技有限公司 | Biometric image quality modifying apparatus |
-
2011
- 2011-11-01 CN CN2011204253928U patent/CN202306587U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385699A (en) * | 2011-11-01 | 2012-03-21 | 长春方圆光电技术有限责任公司 | System for acquiring palmprint in dark background |
| CN106960194A (en) * | 2017-03-24 | 2017-07-18 | 徐晨 | A kind of vein identification device |
| CN109460741A (en) * | 2018-11-16 | 2019-03-12 | 青岛奥美克生物信息科技有限公司 | Biometric image quality modifying apparatus |
| CN109460741B (en) * | 2018-11-16 | 2024-01-23 | 青岛奥美克生物信息科技有限公司 | Biological recognition image quality improving device |
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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: 20120704 Termination date: 20171101 |