CN208903273U - A living body detection device - Google Patents
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Abstract
本实用新型实施例提供一种活体检测装置。装置包括：光发射单元，用于分别发射第一波段红外光和第二波段红外光；光接收单元，用于获取待检测对象的第一反射光和第二反射光，并基于第一反射光获取对应的第一电压值，基于第二反射光获取对应的第二电压值；检测单元，用于获取第一电压值和第二电压值的比值，并将比值与预设阈值进行对比，以检测待检测对象是否为活体。本实用新型实施例提供的装置，通过向待检测对象发射红外光，并接收待检测对象对照射于自身的红外光的反射光，根据反射光来判定待检测对象是否为活体。相比于现有技术，本实用新型实施例提供的装置对于设备要求和采集环境要求不高，方便进行无感采集，成本低且检测时间快。
The embodiment of the present invention provides a living body detection device. The device includes: a light emitting unit for respectively emitting first-wavelength infrared light and second-wavelength infrared light; a light receiving unit for acquiring the first reflected light and the second reflected light of the object to be detected, and based on the first reflected light obtaining a corresponding first voltage value, and obtaining a corresponding second voltage value based on the second reflected light; a detection unit, configured to obtain a ratio between the first voltage value and the second voltage value, and compare the ratio with a preset threshold to obtain a Detect whether the object to be detected is alive. The device provided by the embodiment of the present invention transmits infrared light to the object to be detected, receives the reflected light of the object to be detected to the infrared light irradiated on itself, and determines whether the object to be detected is a living body according to the reflected light. Compared with the prior art, the device provided by the embodiment of the present invention has low requirements for equipment and collection environment, facilitates non-inductive collection, has low cost and fast detection time.
Description
技术领域technical field
本实用新型实施例涉及活体检测技术领域，尤其涉及一种活体检测装置。The embodiments of the present invention relate to the technical field of living body detection, and in particular, to a living body detection device.
背景技术Background technique
活体检测是通常应用在身份验证等场合中的以确定待检测对象的真实生理特征的方法，能够确定待检测对象是否为真实活体本人，可有效抵御照片、换脸、面具、遮挡和屏幕翻拍等常见的攻击手段，以保证身份验证的准确性。Liveness detection is a method that is usually used in identity verification and other occasions to determine the real physiological characteristics of the object to be detected. It can determine whether the object to be detected is a real living body, and can effectively resist photos, face swaps, masks, occlusions, and screen remakes. Common attack methods to ensure the accuracy of authentication.
通常，活体检测的两种方式为：Generally, there are two ways of liveness detection:
方式1、利用虹膜信息进行活体检测Method 1. Use iris information for live detection
虹膜作为人体生物特征之一，具备唯一性和防伪性高的特点。利用虹膜信息进行活体检测的方法为：通过相机去判断待检测对象的眼部运动状态，譬如眨眼或眼球运动等，在检测到待检测对象的眼部运动之后，通过专用的红外相机去采集待检测对象的眼部的虹膜信息，根据虹膜信息来判断待检测对象是否为活体。As one of the biological characteristics of the human body, the iris has the characteristics of uniqueness and high anti-counterfeiting. The method of using iris information for live detection is: use a camera to determine the eye movement state of the object to be detected, such as blinking or eye movement, etc. After detecting the eye movement of the object to be detected, use a special infrared camera to collect the object to be detected. The iris information of the eye of the object is detected, and whether the object to be detected is a living body is determined according to the iris information.
方式2、利用人脸多姿态、多表情进行活体检测Method 2. Use face multi-pose and multi-expression for liveness detection
该方法通过发出指令指导待检测对象做出一系列规定动作或者表情，然后与预设的动作或者表情进行比对，根据比对结果来判断待检测对象是否为活体。The method guides the object to be detected to make a series of prescribed actions or expressions by issuing instructions, and then compares with the preset actions or expressions, and judges whether the object to be detected is a living body according to the comparison result.
方式1的缺陷在于：虹膜检测对于设备要求和采集环境要求较高，不方便进行无感采集，且成本高；方式2的缺陷在于：通过下达指令的方式导致交互不友好且活体检测时间长，从而导致待检测对象的使用感差。The disadvantage of method 1 is that iris detection has high requirements for equipment and collection environment, which is inconvenient to perform non-inductive acquisition, and the cost is high; As a result, the sense of use of the object to be detected is poor.
实用新型内容Utility model content
针对现有技术中存在的技术问题，本实用新型实施例提供一种活体检测装置。Aiming at the technical problems existing in the prior art, an embodiment of the present invention provides a living body detection device.
本实用新型实施例提供一种活体检测装置，包括：An embodiment of the present invention provides a living body detection device, comprising:
光发射单元，用于分别发射第一波段红外光和第二波段红外光，以照射待检测对象；a light emitting unit for emitting the first-band infrared light and the second-band infrared light respectively to illuminate the object to be detected;
光接收单元，用于获取所述待检测对象的第一反射光和第二反射光，并基于所述第一反射光获取对应的第一电压值，基于所述第二反射光获取对应的第二电压值；其中，所述第一反射光为所述待检测对象被第一波段红外光照射所反射的光，所述第二反射光为所述待检测对象被第二波段红外光照射所反射的光；The light receiving unit is used to obtain the first reflected light and the second reflected light of the object to be detected, and obtain the corresponding first voltage value based on the first reflected light, and obtain the corresponding first voltage value based on the second reflected light. Two voltage values; wherein, the first reflected light is the light reflected by the object to be detected when irradiated by the infrared light of the first wavelength band, and the second reflected light is the light reflected by the object to be detected by the infrared light of the second wavelength band. reflected light;
检测单元，用于获取所述第一电压值和所述第二电压值的比值，并将所述比值与预设阈值进行对比，以检测所述待检测对象是否为活体。A detection unit, configured to acquire a ratio between the first voltage value and the second voltage value, and compare the ratio with a preset threshold to detect whether the object to be detected is a living body.
进一步地，所述光发射单元包括：Further, the light emitting unit includes:
第一波段红外光光源和第二波段红外光光源；其中，a first-band infrared light source and a second-band infrared light source; wherein,
所述第一波段红外光光源为波段为800～1100nm的LED光源，用于发射第一波段红外光；The first-wavelength infrared light source is an LED light source with a wavelength range of 800-1100 nm, used for emitting the first-wavelength infrared light;
所述第二波段红外光光源为波段为1200～1600nm的LED光源，用于发射第二波段红外光。The second-wavelength infrared light source is an LED light source with a wavelength range of 1200-1600 nm, which is used for emitting the second-wavelength infrared light.
进一步地，所述光接收单元包括：Further, the light receiving unit includes:
第一二极管和第二二极管；其中，a first diode and a second diode; wherein,
所述第一二极管为硅基光电二极管，用于获取所述待检测对象的第一反射光，并基于所述第一反射光获取对应的第一电压值；The first diode is a silicon-based photodiode, which is used to obtain the first reflected light of the object to be detected, and obtain a corresponding first voltage value based on the first reflected light;
所述第二二极管为铟砷化镓光电二极管，用于获取所述待检测对象的第二反射光，并基于所述第二反射光获取对应的第二电压值。The second diode is an indium gallium arsenide photodiode, which is used for acquiring the second reflected light of the object to be detected, and acquiring a corresponding second voltage value based on the second reflected light.
进一步地，所述光发射单元还包括：第一会聚镜头和第二会聚镜头；其中，Further, the light emitting unit further includes: a first condensing lens and a second condensing lens; wherein,
所述第一会聚镜头，沿所述第一波段红外光光源的光照方向设置，位于所述第一波段红外光光源与所述待检测对象之间，且与所述第一波段红外光光源连接；The first condensing lens is arranged along the illumination direction of the first-wavelength infrared light source, is located between the first-wavelength infrared light source and the object to be detected, and is connected to the first-wavelength infrared light source ;
所述第二会聚镜头，沿所述第二波段红外光光源的光照方向设置，位于所述第二波段红外光光源与所述待检测对象之间，且与所述第二波段红外光光源连接。The second condensing lens is arranged along the illumination direction of the second-wavelength infrared light source, is located between the second-wavelength infrared light source and the object to be detected, and is connected to the second-wavelength infrared light source .
进一步地，所述光接收单元还包括：第一准直镜头和第二准直镜头；其中，Further, the light receiving unit further includes: a first collimating lens and a second collimating lens; wherein,
所述第一准直镜头，沿所述第一二极管获取的反射光的光照方向设置，位于所述第一二极管和所述待检测对象之间，且与所述第一二极管连接；The first collimating lens is arranged along the illumination direction of the reflected light obtained by the first diode, is located between the first diode and the object to be detected, and is connected to the first diode. pipe connection;
所述第二准直镜头，沿所述第二二极管获取的反射光的光照方向设置，位于所述第二二极管和所述待检测对象之间，且与所述第二二极管连接。The second collimating lens is arranged along the illumination direction of the reflected light obtained by the second diode, is located between the second diode and the object to be detected, and is connected with the second diode. Tube connection.
本实用新型实施例提供的一种活体检测装置，通过向待检测对象发射红外光，并接收待检测对象对照射于自身的红外光的反射光，根据反射光来判定待检测对象是否为活体。相比于现有技术，本实用新型实施例提供的装置对于设备要求和采集环境要求不高，方便进行无感采集，成本低且检测时间快。The embodiment of the present invention provides a living body detection device, which emits infrared light to the object to be detected, receives the reflected light of the infrared light irradiated on itself by the object to be detected, and determines whether the object to be detected is a living body according to the reflected light. Compared with the prior art, the device provided by the embodiment of the present invention has low requirements on equipment and collection environment, is convenient for non-inductive collection, has low cost and fast detection time.
附图说明Description of drawings
为了更清楚地说明本实用新型实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work.
图1为本实用新型实施例提供的一种活体检测装置的结构示意图。FIG. 1 is a schematic structural diagram of a living body detection device according to an embodiment of the present invention.
具体实施方式Detailed ways
为使本实用新型实施例的目的、技术方案和优点更加清楚，下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
图1为本实用新型实施例提供的一种活体检测装置的结构示意图，如图1所示，该装置包括：FIG. 1 is a schematic structural diagram of a living body detection device provided by an embodiment of the present invention. As shown in FIG. 1 , the device includes:
光发射单元1，用于分别发射第一波段红外光和第二波段红外光，以照射待检测对象4。The light emitting unit 1 is used for respectively emitting the infrared light of the first wavelength band and the infrared light of the second wavelength band to illuminate the object 4 to be detected.
具体地，光发射单元1能够至少发射两种波段的红外光，以光发射单元1仅能够发射两种波段的红外光为例，对本实用新型实施例进行说明。在此，将两种波段的红外光分别称为第一波段红外光和第二波段红外光，第一波段红外光和第二波段红外光均用于照射待检测对象4。Specifically, the light emitting unit 1 can emit at least two wavelength bands of infrared light, and the embodiment of the present invention is described by taking the example that the light emitting unit 1 can only emit infrared light with two wavelength bands. Here, the infrared light of the two wavelength bands are respectively referred to as the first wavelength band infrared light and the second wavelength band infrared light, and both the first wavelength band infrared light and the second wavelength band infrared light are used to illuminate the object 4 to be detected.
光接收单元2，用于获取所述待检测对象4的第一反射光和第二反射光，并基于所述第一反射光获取对应的第一电压值，基于所述第二反射光获取对应的第二电压值；其中，所述第一反射光为所述待检测对象4被第一波段红外光照射所反射的光，所述第二反射光为所述待检测对象4被第二波段红外光照射所反射的光。The light receiving unit 2 is used to obtain the first reflected light and the second reflected light of the object 4 to be detected, and obtain the corresponding first voltage value based on the first reflected light, and obtain the corresponding first voltage value based on the second reflected light. The second voltage value of Infrared light illuminates the reflected light.
具体地，光接收单元2向待检测对象4发射两种波段的红外光后，待检测对象4对照射于自身的两种波段的红外光分别进行反射，以形成两种反射光。在此，将待检测对象4被第一波段红外光照射所反射的光称为第一反射光，将待检测对象4被第二波段红外光照射所反射的光称为第二反射光。Specifically, after the light receiving unit 2 emits infrared light of two wavelength bands to the object to be detected 4, the object to be detected 4 reflects the infrared light of the two wavelength bands irradiated on itself to form two kinds of reflected light. Here, the light reflected by the object 4 to be detected irradiated by the infrared light of the first wavelength band is called the first reflected light, and the light reflected by the object to be detected 4 irradiated by the infrared light of the second wavelength band is called the second reflected light.
进一步地，光接收单元2还能够获取每一反射光对应的电压值，具体地，光接收单元2能够获取第一反射光对应的第一电压值和第二反射光对应的第二电压值。Further, the light receiving unit 2 can also obtain a voltage value corresponding to each reflected light. Specifically, the light receiving unit 2 can obtain a first voltage value corresponding to the first reflected light and a second voltage value corresponding to the second reflected light.
检测单元3，用于获取所述第一电压值和所述第二电压值的比值，并将所述比值与预设阈值进行对比，以检测所述待检测对象4是否为活体。The detection unit 3 is configured to acquire the ratio of the first voltage value and the second voltage value, and compare the ratio with a preset threshold to detect whether the object to be detected 4 is a living body.
具体地，检测单元3能够将第一电压值和第二电压值的比值与预设阈值进行对比，根据两者的大小关系，检测待检测对象4是否为活体。其中，预设阈值通常为经验值，可根据具体应用场景自行设置。检测单元3可为具有计算功能的任何实体设备。Specifically, the detection unit 3 can compare the ratio of the first voltage value and the second voltage value with a preset threshold value, and detect whether the object to be detected 4 is a living body according to the magnitude relationship between the two. Among them, the preset threshold is usually an empirical value, which can be set by itself according to specific application scenarios. The detection unit 3 can be any physical device with computing function.
需要说明的是，光发射单元1和光接收单元2可以为两个分立的实体设备，也可以集成于一体。It should be noted that the light emitting unit 1 and the light receiving unit 2 may be two separate physical devices, or may be integrated into one.
本实用新型实施例提供的装置，通过向待检测对象发射红外光，并接收待检测对象对照射于自身的红外光的反射光，根据反射光来判定待检测对象是否为活体。相比于现有技术，本实用新型实施例提供的装置对于设备要求和采集环境要求不高，方便进行无感采集，成本低且检测时间快。The device provided by the embodiment of the present invention transmits infrared light to the object to be detected, receives the reflected light of the object to be detected to the infrared light irradiated on itself, and determines whether the object to be detected is a living body according to the reflected light. Compared with the prior art, the device provided by the embodiment of the present invention has low requirements on equipment and collection environment, is convenient for non-inductive collection, has low cost and fast detection time.
在上述各实施例的基础上，本实用新型实施例中的光发射单元还包括：On the basis of the above embodiments, the light emitting unit in the embodiment of the present invention further includes:
第一波段红外光光源和第二波段红外光光源；其中，所述第一波段红外光光源为波段为800～1100nm的LED光源，用于发射第一波段红外光；所述第二波段红外光光源为波段为1200～1600nm的LED光源，用于发射第二波段红外光。A first-wavelength infrared light source and a second-wavelength infrared light source; wherein the first-wavelength infrared light source is an LED light source with a wavelength range of 800-1100 nm, which is used to emit first-wavelength infrared light; the second-wavelength infrared light The light source is an LED light source with a wavelength range of 1200-1600 nm, which is used for emitting infrared light of the second wavelength band.
具体地，第一波段红外光为近红外光，其波段为800～1100nm，第二波段红外光为短波红外光，其波段为1200～1600nm。使用近红外光分别照射活体和非活体，可明显得出活体皮肤和非活体的光谱特性类似的结论，但使用短波红外光分别照射活体和非活体，活体皮肤对该波段的光吸收作用明显，而非活体没有明显的吸收效应，通过这个差异可以进行活体检测。需要说明的是，近红外光的加入作用是为了增加光照鲁棒性，使得检测结果不管在低光照还是高光照下都是成立的。Specifically, the first wavelength band of infrared light is near-infrared light, and its wavelength band is 800-1100 nm, and the second wavelength band of infrared light is short-wave infrared light, and its wavelength band is 1200-1600 nm. Using near-infrared light to irradiate living and non-living bodies respectively, it can be clearly concluded that the spectral characteristics of living skin and non-living bodies are similar, but using short-wave infrared light to irradiate living and non-living bodies respectively, the light absorption effect of living skin in this band is obvious, The non-living body has no obvious absorption effect, and the living body can be detected by this difference. It should be noted that the addition of near-infrared light is to increase the illumination robustness, so that the detection results are valid regardless of low light or high light.
在上述各实施例的基础上，本实用新型实施例中的光接收单元还包括：On the basis of the above embodiments, the light receiving unit in the embodiment of the present invention further includes:
第一二极管和第二二极管；其中，所述第一二极管为硅基光电二极管，用于获取所述待检测对象的第一反射光，并基于所述第一反射光获取对应的第一电压值；所述第二二极管为铟砷化镓光电二极管，用于获取所述待检测对象的第二反射光，并基于所述第二反射光获取对应的第二电压值。A first diode and a second diode; wherein, the first diode is a silicon-based photodiode, which is used to acquire the first reflected light of the object to be detected, and acquire based on the first reflected light The corresponding first voltage value; the second diode is an indium gallium arsenide photodiode, which is used to obtain the second reflected light of the object to be detected, and obtain the corresponding second voltage based on the second reflected light value.
在上述各实施例的基础上，所述光发射单元还包括：第一会聚镜头和第二会聚镜头；其中，所述第一会聚镜头，沿所述第一波段红外光光源的光照方向设置，位于所述第一波段红外光光源与所述待检测对象之间，且与所述第一波段红外光光源连接；所述第二会聚镜头，沿所述第二波段红外光光源的光照方向设置，位于所述第二波段红外光光源与所述待检测对象之间，且与所述第二波段红外光光源连接。On the basis of the above embodiments, the light emitting unit further includes: a first condensing lens and a second condensing lens; wherein, the first condensing lens is arranged along the illumination direction of the first-wavelength infrared light source, is located between the first-wavelength infrared light source and the object to be detected, and is connected to the first-wavelength infrared light source; the second converging lens is arranged along the illumination direction of the second-wavelength infrared light source , which is located between the second-wavelength infrared light source and the object to be detected, and is connected to the second-wavelength infrared light source.
具体地，为了进一步增强装置对外界光照的抗干扰能力，在两个LED光源前都分别设置会聚镜头，使用会聚镜头来控制光源光强分布，使发射光的光强分布在待检测对象的有效区域。Specifically, in order to further enhance the anti-interference ability of the device to external light, a condensing lens is respectively set in front of the two LED light sources, and the converging lens is used to control the light intensity distribution of the light source, so that the light intensity distribution of the emitted light is effective in the object to be detected. area.
在上述各实施例的基础上，所述光接收单元还包括：第一准直镜头和第二准直镜头；其中，所述第一准直镜头，沿所述第一二极管获取的反射光的光照方向设置，位于所述第一二极管和所述待检测对象之间，且与所述第一二极管连接；所述第二准直镜头，沿所述第二二极管获取的反射光的光照方向设置，位于所述第二二极管和所述待检测对象之间，且与所述第二二极管连接。On the basis of the above embodiments, the light receiving unit further includes: a first collimating lens and a second collimating lens; wherein, the first collimating lens is a reflection obtained along the first diode The illumination direction of the light is set, located between the first diode and the object to be detected, and connected with the first diode; the second collimating lens, along the second diode The illumination direction of the acquired reflected light is set, located between the second diode and the object to be detected, and connected to the second diode.
具体地，为了进一步增强对外界光照的抗干扰能力，在两个光电二极管前都分别设置准直镜头，使用准直镜头增强反射光的采集能力。Specifically, in order to further enhance the anti-interference ability to external light, a collimating lens is respectively set in front of the two photodiodes, and the collimating lens is used to enhance the ability to collect reflected light.
最后应说明的是：以上实施例仅用以说明本实用新型的技术方案，而非对其限制；尽管参照前述实施例对本实用新型进行了详细的说明，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实用新型各实施例技术方案的精神和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit of the technical solutions of the embodiments of the present invention and range.
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