WO2019128463A1 - 一种静脉图像采集装置 - Google Patents

一种静脉图像采集装置 Download PDF

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Publication number
WO2019128463A1
WO2019128463A1 PCT/CN2018/113645 CN2018113645W WO2019128463A1 WO 2019128463 A1 WO2019128463 A1 WO 2019128463A1 CN 2018113645 W CN2018113645 W CN 2018113645W WO 2019128463 A1 WO2019128463 A1 WO 2019128463A1
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Prior art keywords
polarizer
vein image
disposed
infrared light
infrared
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PCT/CN2018/113645
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English (en)
French (fr)
Inventor
黄永峰
胡星
赵飞
龚文川
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GRG Banking Equipment Co Ltd
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GRG Banking Equipment Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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

Definitions

  • the present invention relates to the field of identity verification technologies, and in particular, to a vein image acquisition device.
  • biometrics As an intrinsic attribute of human beings, and with strong self-stability and individual differences, biometrics become an ideal basis for automatic authentication.
  • Current biometric recognition technologies mainly include: fingerprint recognition, retina recognition, iris recognition, gait recognition, vein recognition and face recognition.
  • the vein recognition technology achieves the purpose of identity verification by collecting images of veins in the fingers or palms and performing living body recognition on the vein images. It has high anti-counterfeiting, in vivo detection, high accuracy, adaptability and ease of use.
  • the existing vein image acquisition device can be divided into two types: upper lighting and side lighting from the light source lighting structure.
  • the light source of the upper light vein image acquisition device is above the finger.
  • an opaque cover is generally arranged above the finger, but this makes the user unable to see the position of the finger when using the device, which seriously affects the use experience.
  • the light source of the side-lighting vein image acquisition device is on one side or both sides of the finger, and an opaque cover is not disposed above the finger. Under external illumination, there is a problem of over-exposure of the vein image.
  • the invention provides a vein image collecting device, which solves the technical problem that the upper light vein image collecting device can cause the user to use the finger position and the side light vein image collecting device can cause the vein image to be overexposed.
  • the invention provides a vein image acquisition device, comprising: a main body, an imaging component, an infrared light source, a first polarizer and a second polarizer;
  • the body is provided with an opening for natural light to be incident, and the second polarizer is disposed at the opening;
  • the side of the main body is provided with an opening for the object to be collected
  • the infrared light source is disposed in the main body for emitting infrared light to irradiate the object to be collected placed from the opening;
  • the imaging component is disposed in the body for receiving infrared light transmitted through the object to be collected for imaging of a vein image;
  • the first polarizer is disposed in the body and is located between the imaging component and the opening for polarizing the infrared light and the first polarized light that are incident on the imaging component
  • the first polarized light is polarized light generated by the natural light being polarized by the second polarizer;
  • the polarization directions of the first polarizer and the second polarizer are non-parallel preset angles.
  • the vein image acquisition device further comprises an infrared filter disposed between the imaging assembly and the opening.
  • the infrared filter is disposed between the first polarizer and the imaging assembly.
  • the first polarizer is disposed between the infrared filter and the imaging assembly.
  • the first polarizer is attached to the infrared filter.
  • the first polarizer is disposed at or suspended between the infrared filter and the imaging assembly.
  • the polarization direction of the first polarizer is set to be perpendicular to the direction of the finger knuckle placed.
  • the polarizer is a linear polarizer or a circular polarizer.
  • the polarizing plate is made of glass or resin.
  • the surface of the first polarizer is provided with an infrared anti-reflection film for enhancing the transmittance of infrared light emitted by the infrared light source.
  • the present invention has the following advantages:
  • the natural light is irradiated onto the object to be collected through the second polarizer, and the user can see the position of the finger through the second polarizer; the infrared light source emits infrared light, and the infrared light is transmitted through the object to be collected.
  • the infrared light does not pass through the second polarizer, and the natural light is first polarized by the second polarizer to become the first polarized light, the first polarized light
  • the first polarized light is filtered by the first polarizer and cannot enter the imaging assembly.
  • the vein image acquisition device of the present invention does not need to be provided with an opaque cover, and solves the technical problem that the upper photon vein image acquisition device may not be able to see the position of the finger when the user uses it.
  • the user experience is improved, and natural light is not incident on the imaging component, which solves the technical problem that the side-lighting vein image acquisition device may cause the vein image to be overexposed.
  • FIG. 1 is a schematic structural view of a first embodiment of a vein image acquisition device according to the present invention
  • FIG. 2 is a schematic view showing a comparison of a polarization direction of a first polarizer and a polarization direction of a second polarizer;
  • FIG. 3 is a schematic view showing a relative direction of a polarization direction of a first polarizer and a finger streak direction.
  • FIG. 4 is a schematic diagram of an optical path of a first embodiment of a vein image acquisition device according to the present invention.
  • FIG. 5 is a schematic diagram of an optical path of a second embodiment of a vein image acquisition device according to the present invention.
  • FIG. 6 is a schematic diagram of an optical path of a third embodiment of a vein image acquisition device according to the present invention.
  • FIG. 7 is a schematic diagram of an optical path of a fourth embodiment of a vein image acquisition device according to the present invention.
  • FIG. 8 is a schematic diagram of an optical path of a fifth embodiment of a vein image acquisition device according to the present invention.
  • FIG. 9 is a schematic diagram of an optical path of a sixth embodiment of a vein image acquisition device according to the present invention.
  • FIG. 10 is a schematic diagram of an optical path of a seventh embodiment of a vein image acquisition device according to the present invention.
  • the invention provides a vein image collecting device, which solves the technical problem that the upper light vein image collecting device can cause the user to use the finger position and the side light vein image collecting device can cause the vein image to be overexposed.
  • FIG. 1 is a schematic structural diagram of a first embodiment of a vein image acquisition device provided by the present invention.
  • the present invention provides an embodiment of a vein image acquisition device comprising: a body 7, an imaging assembly 1, an infrared source 5, a first polarizer 2, and a second polarizer 3.
  • the main body 7 is provided with an opening 8 for natural light to be incident, and the second polarizing plate 3 is disposed at the opening 8.
  • This embodiment does not limit the shape and size of the opening 8.
  • the natural light enters the object to be collected from the opening 8 and is reflected into the human eye, so that the position of the object to be collected 6 is seen from the opening 8 when the user uses it.
  • the second polarizing plate 3 is disposed at the opening 8 such that the natural light becomes the first polarized light after being deflected by the second polarizing plate 3 upon entering the main body 7.
  • the side of the main body 7 is provided with an opening for the object to be collected 6 to be placed. It should be noted that the opening is not shown in FIG.
  • the collection object can be any part where a vein image can be collected, such as a finger or a palm.
  • the infrared light source 5 is disposed in the main body 7 for emitting infrared light to illuminate the object to be collected 6 placed from the opening.
  • the infrared source 5 can be an infrared LED source.
  • the specific position of the infrared light source 5 is not specifically limited in this embodiment, as long as it can be irradiated to the object to be collected 6 and imaged in the imaging assembly 1, for example, it can be disposed obliquely above the object to be collected 6 as shown in FIG. It can also be placed directly above the object to be collected 6.
  • the imaging assembly 1 is disposed in the main body 7 for receiving infrared light transmitted through the object to be collected 6 to perform vein image imaging. As shown in FIG. 1, the imaging assembly 1 may be disposed at the bottom in the main body 7.
  • Imaging assembly 1 includes, but is not limited to, a lens and a sensor.
  • the first polarizing plate 2 is disposed in the main body 7 and located between the imaging assembly 1 and the opening for polarizing the infrared light and the first polarized light that are incident on the imaging assembly 1.
  • the first polarized light is natural light. Polarized light generated after the second polarizer is deflected;
  • the polarization directions of the first polarizer 2 and the second polarizer 3 are non-parallel preset angles.
  • the preset angle may be set to 90 degrees.
  • the polarization direction of the first polarizing plate 2 and the polarization direction of the second polarizing plate 3 are compared. schematic diagram.
  • the infrared light that is irradiated onto the object to be collected 6 does not pass through the second polarizing plate 3, and the natural light first passes through the second polarizing plate 3 to become the first polarized light, and the first polarized light reaches the first.
  • the first polarized light is filtered out when passing through the first polarizing plate 2, so that Entering the imaging assembly 1, there is no problem with overexposure of the vein image.
  • the vein image acquisition device further includes an infrared filter 4 disposed between the imaging assembly 1 and the opening.
  • the infrared filter 4 may be disposed between the first polarizer 2 and the imaging assembly 1; as shown in FIG. 1, the first polarizer 2 may also be disposed on the infrared filter 4 and imaged. Between components 1.
  • the function of the infrared filter 4 is to filter the light, for example, to filter out the non-infrared light in the weak natural light entering from the opening, thereby effectively ensuring the quality of the vein image.
  • FIG. 3 is a schematic diagram of the relative directions of the polarization direction of the first polarizer 2 and the direction of the finger knuckles.
  • the polarization direction of the first polarizing plate 2 is set to be perpendicular to the direction of the finger knuckle placed.
  • the inventors have found in the research that the vein image collected by the vein image collecting device in the embodiment is usually bright at the finger streak, so the polarization direction of the first polarizing plate 2 can be adjusted according to the angle at which the finger is placed. Designed to be perpendicular to the direction of the finger's knuckles, it can reduce the transmittance of infrared light at the finger knuckles and improve the brightness uniformity of the finger vein image.
  • the polarizing plate (referring to the first polarizing plate and the second polarizing plate) may be a linear polarizer or a circular polarizer, and the polarizing plate may be made of glass or resin.
  • an infrared anti-reflection film is disposed on the surface of the first polarizer 2 for enhancing transmittance to infrared light.
  • the embodiment of the invention improves the imaging quality of the vein image under the strong light condition by preventing the over-exposure of the vein image, improving the brightness uniformity of the finger vein image, and improving the transmittance of the first polarizer 2 to the infrared light.
  • the reduction algorithm is difficult to identify the vein image, and the ease of use of the finger vein device under strong light conditions is increased.
  • FIG. 4 is a schematic diagram of an optical path of a first embodiment of a vein image acquisition device provided by the present invention.
  • the first polarizer 2 is suspended between the infrared filter 4 and the imaging assembly 1, that is, the first polarizer 2 is neither in contact with the imaging assembly 1 nor in contact with the infrared filter 4.
  • the infrared light source 5 is disposed on the inner wall obliquely above the object to be collected 6, although the infrared light source 5 shown in FIG. 4 has two and is distributed obliquely above both sides of the object to be collected 6, but it may be only in the object to be collected 6 An infrared light source 5 is disposed above one side.
  • FIG. 5 is a schematic diagram of an optical path of a second embodiment of a vein image acquisition device provided by the present invention.
  • the first polarizing plate 2 is suspended between the infrared filter 4 and the imaging assembly 1 and disposed at the imaging assembly 1, and the infrared light source 5 is disposed on the inner wall obliquely above the object to be collected 6, although
  • the infrared light source 5 shown in FIG. 5 has two and is disposed obliquely above both sides of the object to be collected 6, but it is also possible to provide the infrared light source 5 only on the side of the object 6 to be collected.
  • FIG. 6 is a schematic diagram of an optical path of a third embodiment of a vein image acquisition device provided by the present invention.
  • the first polarizer 2 is suspended between the infrared filter 4 and the imaging assembly 1, and is neither in contact with the imaging assembly 1 nor in contact with the infrared filter 4.
  • the infrared light source 5 is disposed between the object to be collected 6 and the second polarizing plate 3, for example, may be disposed directly above the object to be collected 6; for ease of installation, the infrared light source 5 may be directly disposed on the lower surface of the second polarizing plate 3. Since the infrared light source 5 is small in volume compared with the second polarizing plate 3, the user can still see the position of the object 6 to be collected through the second polarizing plate 3.
  • FIG. 7 is a schematic diagram of an optical path of a fourth embodiment of a vein image acquisition device provided by the present invention.
  • the first polarizer 2 is suspended between the infrared filter 4 and the imaging assembly 1 and disposed at the imaging assembly 1, and the infrared source 5 is located between the object 6 to be collected and the second polarizer 3.
  • the infrared light source 5 may be directly disposed on the lower surface of the second polarizing plate 3 because the infrared light source 5 is very bulky compared to the second polarizing plate 3. Small, so the user can still see the position of the object to be collected 6 through the second polarizing plate 3.
  • FIG. 8 is a schematic diagram of an optical path of a fifth embodiment of a vein image acquisition device provided by the present invention.
  • the infrared filter 4 is disposed between the first polarizer 2 and the imaging assembly 1. Specifically, the infrared filter 4 and the first polarizer 2 may be disposed in abutting manner.
  • the infrared light source 5 is disposed between the object to be collected 6 and the second polarizing plate 3, for example, may be disposed directly above the object to be collected 6; for ease of installation, the infrared light source 5 may be directly disposed on the lower surface of the second polarizing plate 3. Since the infrared light source 5 is small in volume compared with the second polarizing plate 3, the user can still see the position of the object 6 to be collected through the second polarizing plate 3.
  • FIG. 9 is a schematic diagram of an optical path of a sixth embodiment of a vein image acquisition device provided by the present invention.
  • the infrared filter 4 is disposed between the first polarizer 2 and the imaging assembly 1. Specifically, the infrared filter 4 and the first polarizer 2 may be disposed in abutting manner.
  • the infrared light source 5 is disposed on the inner wall obliquely above the object to be collected 6. Although the infrared light source 5 shown in FIG. 9 has two and is distributed obliquely above the two sides of the object to be collected 6, it may be only in the object to be collected 6 An infrared light source 5 is disposed above the side.
  • FIG. 10 is a schematic diagram of an optical path of a seventh embodiment of a vein image acquisition device provided by the present invention.
  • the first polarizing plate 2 may be disposed on the side of the infrared light source 5 close to the object to be collected 6, and other structures and connection relationships are The same as the sixth embodiment, the specific description can be referred to the sixth embodiment.
  • the infrared light source 5 is disposed on both sides of the inner wall of the main body 7.
  • the two infrared light sources 5 are respectively located obliquely above the finger, and the infrared light source 5 emits infrared light, so that the infrared light is transmitted through the to-be-collected.
  • the object 6 passes through the infrared filter 4 and the first polarizer 2 to form a vein image in the imaging unit 1.
  • the natural light passes through the second polarizer to become the first polarized light, and the first polarized light is irradiated onto the object to be collected 6 and reflected into the human eye, so that the user can see the position of the collected object when using.
  • the natural light passes through the first polarizer 2 It is filtered out so that it cannot enter the imaging unit 1, so there is no problem of overexposure of the vein image.

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Abstract

一种静脉图像采集装置，主体设置有供自然光入射的开口，且第二偏振光片设置在开口处；主体侧面设置有开孔，供待采集物放入；红外光源设置在主体中，用于发射红外光照射从开孔放入的待采集物；成像组件设置在主体内，用于接收透射过待采集物的红外光，以进行静脉图像成像；第一偏振光片设置在主体内，且位于成像组件和开孔之间，用于对射向成像组件的红外光和第一偏振光进行偏振处理，第一偏振光为自然光经第二偏振光片起偏后产生的偏振光；第一偏振光片和第二偏振光片的偏振方向呈非平行的预设角度。其解决了上打光静脉图像采集设备会造成用户使用时不能看到自己手指位置及侧打光静脉图像采集设备会引起静脉图像过曝的技术问题。

Description

一种静脉图像采集装置
本申请要求于2017年12月27日提交中国专利局、申请号为201711446292.1、发明名称为“一种静脉图像采集装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及身份验证技术领域，尤其涉及一种静脉图像采集装置。
背景技术
随着社会的不断进步以及各方面对于快速有效的自动身份验证的迫切要求，生物特征识别技术在近几十年中得到了飞速的发展。
作为人的一种内在属性，并且具有很强的自身稳定性及个体差异性，生物特征成为了自动身份验证的理想依据。当前的生物特征识别技术主要包括：指纹识别、视网膜识别、虹膜识别、步态识别、静脉识别和人脸识别等。
静脉识别技术是通过采集手指或手掌中静脉图像，并对静脉图像进行活体识别来达到身份验证的目的，具有高度防伪、活体检测、高度准确、适应性强和简便易用的特性。
现有的静脉图像采集设备从光源照明结构上可分为上打光和侧打光两类。上打光静脉图像采集设备的光源在手指上方，为了避免外界光线对于手指静脉图像的影响，一般在手指上方设置不透明罩，但这样就使得用户使用时不能看到自己手指位置，严重影响使用体验；侧打光静脉图像采集设备的光源在手指一侧或两侧，手指上方并未设置不透明罩，在外界强光照明下，存在静脉图像过曝问题。
发明内容
本发明提供了一种静脉图像采集装置，解决了上打光静脉图像采集设备会造成用户使用时不能看到自己手指位置及侧打光静脉图像采集设备会 引起静脉图像过曝的技术问题。
本发明提供了一种静脉图像采集装置，包括：主体、成像组件、红外光源、第一偏振光片和第二偏振光片；
所述主体设置有供自然光入射的开口，且所述第二偏振光片设置在所述开口处；
所述主体侧面设置有开孔，供待采集物放入；
所述红外光源设置在所述主体中，用于发射红外光照射从所述开孔放入的所述待采集物；
所述成像组件设置在所述主体内，用于接收透射过所述待采集物的红外光，以进行静脉图像成像；
所述第一偏振光片设置在所述主体内，且位于所述成像组件和所述开孔之间，用于对射向所述成像组件的所述红外光和第一偏振光进行偏振处理，所述第一偏振光为所述自然光经第二偏振光片起偏后产生的偏振光；
所述第一偏振光片和所述第二偏振光片的偏振方向呈非平行的预设角度。
优选地，所述的静脉图像采集装置，还包括设置在所述成像组件和所述开孔之间的红外滤光片。
优选地，所述红外滤光片设置在所述第一偏振光片和所述成像组件之间。
优选地，所述第一偏振光片设置在所述红外滤光片和所述成像组件之间。
优选地，所述第一偏振光片与所述红外滤光片贴合。
优选地，所述第一偏振光片设置在所述成像组件处或悬空于所述红外滤光片和所述成像组件之间。
优选地，当待采集物为手指时，所述第一偏振光片的偏振方向设置为与放入的手指节纹方向垂直。
优选地，所述偏振光片为线偏光片或圆偏光片。
优选地，所述偏振光片的材质为玻璃或树脂。
优选地，所述第一偏振光片表面设置有红外增透膜，用于提升对所述红外光源发出的红外光线的透过率。
从以上技术方案可以看出，本发明具有以下优点：
当待采集物放入主体后，自然光经过第二偏振光片照射到待采集物上，用户可以透过第二偏振光片看到手指的位置；红外光源发射红外光，红外光透射过待采集物，并通过第一偏振光片后在成像组件中成静脉图像；红外光不经过第二偏振光片，而自然光先经第二偏振光片起偏后成为第一偏振光，第一偏振光在经过第一偏振光片时，因为第一偏振光片和第二偏振光片的偏振方向呈非平行的预设角度，所以第一偏振光被第一偏振光片过滤掉从而不能进入成像组件，便不存在静脉图像过曝的问题；因此本发明中的静脉图像采集装置不需设置不透明罩，解决了上打光静脉图像采集设备会造成用户使用时不能看到自己手指位置的技术问题，提高了用户体验，自然光也不会射入成像组件，解决了侧打光静脉图像采集设备会引起静脉图像过曝的技术问题。
附图说明
图1为本发明提供的一种静脉图像采集装置的第一实施例的结构示意图；
图2为第一偏振光片的偏振方向和第二偏振光片的偏振方向对比示意图；
图3为第一偏振光片的偏振方向和手指节纹方向的相对方向示意图。
图4为本发明提供的一种静脉图像采集装置的第一实施例的光路示意图；
图5为本发明提供的一种静脉图像采集装置的第二实施例的光路示意图；
图6为本发明提供的一种静脉图像采集装置的第三实施例的光路示意图；
图7为本发明提供的一种静脉图像采集装置的第四实施例的光路示意图；
图8为本发明提供的一种静脉图像采集装置的第五实施例的光路示意图；
图9为本发明提供的一种静脉图像采集装置的第六实施例的光路示意图；
图10为本发明提供的一种静脉图像采集装置的第七实施例的光路示意图。
具体实施方式
本发明提供了一种静脉图像采集装置，解决了上打光静脉图像采集设备会造成用户使用时不能看到自己手指位置及侧打光静脉图像采集设备会引起静脉图像过曝的技术问题。
为使得本发明的发明目的、特征、优点能够更加的明显和易懂，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，下面所描述的实施例仅仅是本发明一部分实施例，而非全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
请参阅图1，本发明提供的一种静脉图像采集装置的第一实施例的结构示意图。
本发明提供了一种静脉图像采集装置的一个实施例，包括：主体7、成像组件1、红外光源5、第一偏振光片2和第二偏振光片3。
主体7设置有供自然光入射的开口8，且第二偏振光片3设置在开口8处。
本实施例对开口8的形状和大小不作限定。
可以理解的是，自然光从开口8进入照射到待采集物6上并反射到人眼中，才能使得用户使用时从开口8看到待采集物6的位置。
第二偏振光片3设置在开口8处，使得自然光在进入主体7时经第二偏振光片3起偏后变成第一偏振光。
主体7侧面设置有开孔，供待采集物6放入，需要说明的是，开孔没有在图1中体现。
采集物体可以任何可以采集到静脉图像的部位，例如可以是手指，也可以是手掌。
需要说明的是，虽然主体7侧面设置有开孔，也可以透过自然光，但当待采集物6放入时，自然光的影响可以被忽略。
红外光源5设置在主体7中，用于发射红外光照射从开孔放入的待采集物6。
红外光源5可以是红外LED光源。
本实施例对红外光源5的具体位置不做具体限定，只要可以照射到待采集物6并在成像组件1中成像即可，例如可以设置在如图1所示的待采集物6的斜上方，也可以设置在待采集物6的正上方。
成像组件1设置在主体7内，用于接收透射过待采集物6的红外光，以进行静脉图像成像，如图1所示，成像组件1可以设置在主体7内的底部。
成像组件1包括但不限于镜头及传感器。
第一偏振光片2设置在主体7内，且位于成像组件1和开孔之间，用于对射向成像组件1的红外光和第一偏振光进行偏振处理，第一偏振光为自然光经第二偏振光片起偏后产生的偏振光；
第一偏振光片2和第二偏振光片3的偏振方向呈非平行的预设角度。
为了使第一偏振光的过滤效果达到最佳，可以将预设角度设置为90度，具体可请参阅图2，第一偏振光片2的偏振方向和第二偏振光片3的偏振方向对比示意图。
需要说明的是，照射到待采集物6上的红外光不经过第二偏振光片3，而自然光先经过第二偏振光片3起偏成为第一偏振光，第一偏振光在到达第一偏振光片2时，因为第一偏振光片2和第二偏振光片3的偏振方向呈非平行的预设角度，所以第一偏振光在经过第一偏振光片2时被过滤掉从而不能进入成像组件1，所以不存在静脉图像过曝的问题。
进一步地，静脉图像采集装置，还包括设置在成像组件1和开孔之间的红外滤光片4。
在本实施例中，红外滤光片4可以设置在第一偏振光片2和成像组件1之间；如图1所示，第一偏振光片2也可以设置在红外滤光片4和成像组件1之间。
红外滤光片4的作用是对进行滤光，例如可以滤掉从开孔进入的微弱 自然光中非红外光，有效地保证了静脉图像的质量。
请参阅图3，第一偏振光片2的偏振方向和手指节纹方向的相对方向示意图。
进一步地，当待采集物6为手指时，第一偏振光片2的偏振方向设置为与放入的手指节纹方向垂直。
发明人在研究中发现，通过本实施例中的静脉图像采集装置采集到的静脉图像通常在手指节纹处偏亮，所以可以根据手指放入的角度，将第一偏振光片2的偏振方向设计为与手指节纹方向垂直，可以减弱红外光在手指节纹处的透过率，改善指静脉图像的亮度均匀性。
进一步地，偏振光片(指第一偏振光片以及第二偏振光片)可以为线偏光片或圆偏光片，偏振光片的材质可以为玻璃或树脂。
进一步地，第一偏振光片2表面设置有红外增透膜，用于提升对红外光的透过率。
本发明实施例通过防止静脉图像过曝、改善指静脉图像的亮度均匀性以及提升第一偏振光片2对红外光的透过率，提高静脉采集装置在强光条件下静脉图像的成像质量，降低算法对于静脉图像比对识别的难度，增加指静脉设备在强光条件下的易用性。
因为红外光源5的设置位置有多种选择，成像组件1、红外滤光片4和第一偏振光片2的排列顺序也有两种情况，所以为了便于对本发明技术方案的理解，通过以下几个实施例对本发明技术方案进行具体说明。
请参阅图4，本发明提供的一种静脉图像采集装置的第一实施例的光路示意图。
在本实施例中，第一偏振光片2悬空于红外滤光片4和成像组件1之间，即第一偏振光片2既不与成像组件1接触，也不与红外滤光片4接触；红外光源5设置在待采集物6斜上方的内壁上，虽然图4所示的红外光源5有两个且分布在待采集物6两侧的斜上方，但也可以只在待采集物6一侧的上方设置红外光源5。
请参阅图5，本发明提供的一种静脉图像采集装置的第二实施例的光路示意图。
在第二实施例中，第一偏振光片2悬空于红外滤光片4和成像组件1 之间且设置在成像组件1处，红外光源5设置在待采集物6斜上方的内壁上，虽然图5所示的红外光源5有两个且分布在待采集物6两侧的斜上方，但也可以只在待采集物6一侧的上方设置红外光源5。
请参阅图6，本发明提供的一种静脉图像采集装置的第三实施例的光路示意图。
在第三实施例中，第一偏振光片2悬空于红外滤光片4和成像组件1之间，既不与成像组件1接触，也不与红外滤光片4接触。
红外光源5位于待采集物6和第二偏振光片3之间，例如可以设置在待采集物6的正上方；为了便于安装，可以直接将红外光源5设置在第二偏振光片3下表面，因为红外光源5与第二偏振光片3相比体积很小，所以用户依然可以透过第二偏振光片3看到待采集物6的位置。
请参阅图7，本发明提供的一种静脉图像采集装置的第四实施例的光路示意图。
在第四实施例中，第一偏振光片2悬空于红外滤光片4和成像组件1之间且设置在成像组件1处，红外光源5位于待采集物6和第二偏振光片3之间，例如可以设置在待采集物6的正上方；为了便于安装，可以直接将红外光源5设置在第二偏振光片3下表面，因为红外光源5与第二偏振光片3相比体积很小，所以用户依然可以透过第二偏振光片3看到待采集物6的位置。
请参阅图8，本发明提供的一种静脉图像采集装置的第五实施例的光路示意图。
在第五实施例中，红外滤光片4设置在第一偏振光片2和成像组件1之间，具体可以将红外滤光片4和第一偏振光片2贴合设置。
红外光源5位于待采集物6和第二偏振光片3之间，例如可以设置在待采集物6的正上方；为了便于安装，可以直接将红外光源5设置在第二偏振光片3下表面，因为红外光源5与第二偏振光片3相比体积很小，所以用户依然可以透过第二偏振光片3看到待采集物6的位置。
请参阅图9，本发明提供的一种静脉图像采集装置的第六实施例的光路示意图。
在第五实施例中，红外滤光片4设置在第一偏振光片2和成像组件1 之间，具体可以将红外滤光片4和第一偏振光片2贴合设置。
红外光源5设置在待采集物6斜上方的内壁上，虽然图9所示的红外光源5有两个且分布在待采集物6两侧的斜上方，但也可以只在待采集物6一侧的上方设置红外光源5。
请参阅图10，本发明提供的一种静脉图像采集装置的第七实施例的光路示意图。
在第七实施例中，当红外光源5设置在待采集物6斜上方的内壁上，还可以在红外光源5靠近待采集物6一侧设置第一偏振光片2，其他结构和连接关系均与第六实施例相同，具体描述可参见第六实施例。
上面是对一种静脉图像采集装置的结构和连接方式进行的详细说明，为便于理解，下面将以一具体应用场景对一种静脉图像采集装置的应用进行说明，应用例包括：
如图1所示，红外光源5设置在主体7内壁两侧，当手指放入主体7后，两个红外光源5分别位于手指斜上方，红外光源5发射红外光，使得红外光透射过待采集物6，并通过红外滤光片4和第一偏振光片2后在成像组件1中成静脉图像。
自然光通过第二偏振光片成为第一偏振光，第一偏振光照射到待采集物6上并反射到人眼中，使得用户使用时看到采集物体的位置。
当第一偏振光到达第一偏振光片2时，因为第一偏振光片2和第二偏振光片3的偏振方向呈非平行的预设角度，所以自然光在经过第一偏振光片2时被过滤掉从而不能进入成像组件1，所以不存在静脉图像过曝的问题。
以上所述，以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (10)

  1. 一种静脉图像采集装置，其特征在于，包括：主体、成像组件、红外光源、第一偏振光片和第二偏振光片；
    所述主体设置有供自然光入射的开口，且所述第二偏振光片设置在所述开口处；
    所述主体侧面设置有开孔，供待采集物放入；
    所述红外光源设置在所述主体中，用于发射红外光照射从所述开孔放入的所述待采集物；
    所述成像组件设置在所述主体内，用于接收透射过所述待采集物的红外光，以进行静脉图像成像；
    所述第一偏振光片设置在所述主体内，且位于所述成像组件和所述开孔之间，用于对射向所述成像组件的所述红外光和第一偏振光进行偏振处理，所述第一偏振光为所述自然光经第二偏振光片起偏后产生的偏振光；
    所述第一偏振光片和所述第二偏振光片的偏振方向呈非平行的预设角度。
  2. 根据权利要求1所述的静脉图像采集装置，其特征在于，还包括设置在所述成像组件和所述开孔之间的红外滤光片。
  3. 根据权利要求2所述的静脉图像采集装置，其特征在于，所述红外滤光片设置在所述第一偏振光片和所述成像组件之间。
  4. 根据权利要求2所述的静脉图像采集装置，其特征在于，所述第一偏振光片设置在所述红外滤光片和所述成像组件之间。
  5. 根据权利要求3所述的静脉图像采集装置，其特征在于，所述第一偏振光片与所述红外滤光片贴合。
  6. 根据权利要求4所述的静脉图像采集装置，其特征在于，所述第一偏振光片设置在所述成像组件处或悬空于所述红外滤光片和所述成像组件之间。
  7. 根据权利要求1所述的静脉图像采集装置，其特征在于，当待采集物为手指时，所述第一偏振光片的偏振方向设置为与放入的手指节纹方向垂直。
  8. 根据权利要求1至7中任意一项所述的静脉图像采集装置，其特征在于，所述第一偏振光片、所述第二偏振光片为线偏光片或圆偏光片。
  9. 根据权利要求1至7中任意一项所述的静脉图像采集装置，其特征在于，所述第一偏振光片、所述第二偏振光片的材质为玻璃或树脂。
  10. 根据权利要求1至7中任意一项所述的静脉图像采集装置，其特征在于，所述第一偏振光片表面设置有红外增透膜，用于提升对所述红外光源发出的红外光线的透过率。
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