CN111881719B - Non-contact type biological recognition guiding device, method and biological feature recognition system - Google Patents
Non-contact type biological recognition guiding device, method and biological feature recognition system Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1312—Sensors therefor direct reading, e.g. contactless acquisition
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
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Abstract
The present disclosure provides a non-contact type biometric guidance device, comprising: at least one light projection device capable of projecting light to form a predetermined pattern on the surface of the photographed object; and a filter device that receives light from the surface of the subject, reflects visible light from the received light from the surface of the subject, and adjusts the relative position between the subject and the filter device based on the visible light reflected by the filter device. The disclosure also provides a non-contact type biological recognition guiding method and a biological feature recognition system.
Description
Technical Field
The disclosure belongs to the technical field of biological recognition, and particularly relates to a non-contact type biological recognition guiding device, a non-contact type biological recognition guiding method and a biological feature recognition system.
Background
The biological recognition technology is a technology for acquiring and identifying the identity of an organism according to the inherent physiological characteristics of a human body. Along with the development and progress of technology, biological characteristic information such as fingerprints, finger veins, palmprints, palm veins, faces, irises and the like is widely applied to biological identification technology and is used as a basis for personal identity information identification.
Fingerprint, palm print or finger vein biological recognition equipment generally needs to be contacted with the collection surface of the equipment by the finger or palm of a user before the fingerprint and vein image can be clearly collected. The equipment is applied to places with complex and dense personnel, the acquisition window is touched and used at high frequency, public health hidden danger exists, and a user can generate contradiction emotion.
To solve the above problems, a noncontact type biometric technique is generally used. By non-contact, it is meant that the user does not have any physical contact with the surface of the device. The technology comprises the steps of shooting images by using an imaging system, shooting a shot object at a certain distance in a non-contact way, acquiring biological characteristic information of the shot object, analyzing by using an algorithm, and comparing and authenticating characteristic points in the acquired images with characteristic points extracted from images input by a user. Can be widely applied to face recognition, iris recognition or palm print and palm vein recognition. The use method is simple, and the safety and the sanitation are realized.
As the non-contact biological identification is realized by image acquisition and algorithm analysis. Ideally, the user is placed according to a certain position, angle or direction in each comparison process, so that the biological information image of the ROI area (the algorithm interested area) of the shot object obtained by the system is similar to or consistent with the recorded biological information image of the ROI area, thus the difficulty of image processing and algorithm analysis can be reduced, and the quick and effective authentication can be realized. However, in practice, since the device is spaced apart from the subject by a certain distance, the subject can freely move in space, and it is difficult for the user to place the palm or fingers at the correct position at a time. There is a high possibility that a deviation of a horizontal position and a vertical position or an angular deviation and rotation may occur in space. These differences are reflected in each acquired image, and are represented by differences in the region of the ROI that is captured, or differences in biometric information in the region of the ROI. This increases the difficulty of image processing, algorithm analysis, affects the comparison speed, and even causes authentication failure. Therefore, in order to compare through the system, the user needs to continuously move the palm, and try various palm placement positions. The use experience is greatly compromised.
To solve this problem, the existing contactless biometric devices are generally improved in terms of both.
The first type, such as the preceding patent CN204181622U, "palm vein recognition device support frame, palm vein recognition device, identity recognition device" discloses a palm vein recognition device support frame, i.e. a C-shaped positioner for palm positioning, one end positions the wrist, and one end sets up the groove and positions the finger. The palm can be quickly guided to be placed at the correct position by limiting the fingers and the wrists through the support, and the palm is ensured not to horizontally displace. But doing so, the following disadvantages may exist:
1. The user can inevitably contact the support and the groove, and the original purpose of non-contact is violated, and the repeated contact of the support and the limiting groove of the equipment can also cause hidden health hazards.
2. The size of the bracket is required to be in line with the hand shape of a human body, which is equivalent to the increase of the size of equipment, and is inconvenient for the transportation, installation or integration of the equipment.
3. The sizes of the support and the groove of the product design are large for most users. However, the sizes of the fingers and the palm vary from person to person, and there are users whose palms are not matched with the sizes of the bracket and the groove, which can reduce the comfort of use.
The second type, such as the prior patent CN103324922a, "non-contact self-guiding palm vein image acquisition device", discloses a non-contact self-guiding palm vein image acquisition device. Palm distance information is acquired through electronic distance measurement, and after analysis, a prompt of the moving direction of a user is given through a voice unit. The voice prompt function can clearly give the user an instruction of moving the shot object through the equipment, and the moving direction and distance can be accurately transmitted to the user through the calculation of the equipment. In addition, the prior patent CN106056080B discloses a visual biometric information collection device and method, which uses a display unit and generates a guide mark of a feature area thereon.
The feedback of the image is more direct, and the user observes the deviation between the gesture of the shot object and the guiding mark on the display unit, and adjusts the gesture of the shot object according to the deviation. Thereby reaching the intended correct position of the device.
Both the above two modes adopt hardware systems outside the vein recognition equipment to interact with the user. However, doing so has the following disadvantages: 1. the user needs to passively accept the image prompt or voice instruction of the device, continuously move fingers or palms to find the correct position, and the time of the comparison process is increased. 2. The user needs to use repeatedly to know how to place the finger or palm to the correct shooting position. 3. The addition of the information prompt function (display and loudspeaker) increases the manufacturing cost of the equipment, and is unfavorable for miniaturization and integration of the biological identification equipment.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present disclosure provides a non-contact type biometric guidance device, method, and biometric system.
The non-contact type biological recognition guiding device, the non-contact type biological recognition guiding method and the biological feature recognition system are realized through the following technical scheme.
According to an aspect of the present disclosure, there is provided a non-contact type biometric guidance device including: at least one light projection device capable of projecting light to form a predetermined pattern on the surface of the photographed object; and a filter device that receives light from the surface of the subject, reflects visible light from the received light from the surface of the subject, and adjusts the relative position between the subject and the filter device based on the visible light reflected by the filter device.
According to the non-contact type biological recognition guide device of at least one embodiment of the present disclosure, the light filtering device is capable of transmitting infrared light.
According to at least one embodiment of the present disclosure, the non-contact biometric guidance device, the filter device is an infrared filter element.
According to the non-contact type biological recognition guide device of at least one embodiment of the present disclosure, the filter device is covered on the image pickup device.
According to at least one embodiment of the present disclosure, a non-contact type biometric guidance device includes a substrate layer and a coating layer disposed on the substrate layer.
According to the non-contact type biometric guidance device of at least one embodiment of the present disclosure, biometric information of a human body is acquired based on an image of a photographed object.
According to the non-contact type biometric guidance device of at least one embodiment of the present disclosure, the number of the light projection devices is two, namely, a first light projection device capable of projecting light to form a first portion of a predetermined pattern on the surface of the photographed object and a second light projection device capable of projecting light to form a second portion of the predetermined pattern on the surface of the photographed object, the first portion and the second portion constituting a complete predetermined pattern.
According to the non-contact type biological recognition guide device of at least one embodiment of the present disclosure, the first light projection device and the second light projection device are disposed at the first side and the second side of the light filtering device, respectively.
According to the non-contact type biometric guidance device of at least one embodiment of the present disclosure, the number of the light projection devices is three, namely, a first light projection device capable of projecting light to form a first portion of a predetermined pattern on the surface of the photographed object, a second light projection device capable of projecting light to form a second portion of the predetermined pattern on the surface of the photographed object, and a third light projection device capable of projecting light to form a third portion of the predetermined pattern on the surface of the photographed object, the first portion, the second portion, and the third portion constituting a complete predetermined pattern.
According to the non-contact type biological recognition guide device of at least one embodiment of the present disclosure, the first light projection device, the second light projection device and the third light projection device are disposed at the first side, the second side and the third side of the light filtering device, respectively.
According to the noncontact biological recognition guidance device of at least one embodiment of the present disclosure, the number of the light projection devices is four, namely, the first light projection device capable of projecting light to form a first portion of a predetermined pattern on the surface of the photographed object, the second light projection device capable of projecting light to form a second portion of the predetermined pattern on the surface of the photographed object, the third light projection device capable of projecting light to form a third portion of the predetermined pattern on the surface of the photographed object, the fourth light projection device capable of projecting light to form a fourth portion of the predetermined pattern on the surface of the photographed object, the first portion, the second portion, the third portion, and the fourth portion constitute a complete predetermined pattern.
According to the non-contact type biological recognition guide device of at least one embodiment of the present disclosure, the first light projection device, the second light projection device, the third light projection device, and the fourth light projection device are disposed at the first side, the second side, the third side, and the fourth side of the light filtering device, respectively.
According to another aspect of the present disclosure, there is provided a non-contact type biometric guidance method for biometric guidance using the non-contact type biometric guidance device of any one of the above, comprising: using at least one light projection device to project light so as to form a preset pattern on the surface of a shot object; receiving light rays from the surface of the shot object by using a light filtering device, and reflecting visible light rays in the received light rays from the surface of the shot object; and adjusting the relative position between the photographed object and the light filtering device based on the visible light reflected by the light filtering device.
According to still another aspect of the present disclosure, there is provided a biometric system including the non-contact biometric guidance device of any one of the above, and an image pickup device that collects light rays of a predetermined wavelength range transmitted through the light filter device.
According to the biometric identification system of at least one embodiment of the present disclosure, the filter device is horizontally disposed on the image pickup device.
According to the biometric identification system of at least one embodiment of the present disclosure, the filter device is disposed on the image pickup device at a predetermined inclination angle with respect to the image pickup device.
According to a biometric identification system of at least one embodiment of the present disclosure, the filter device covers the camera device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a block diagram of a non-contact biometric guidance device according to one embodiment of the present disclosure.
Fig. 2 is a schematic view of a surface of a filter device of a non-contact type biometric sensing device forming a reflective pattern according to an embodiment of the present disclosure.
Fig. 3 is a block diagram of a biometric identification system according to one embodiment of the present disclosure.
Fig. 4 is a block diagram of a biometric identification system according to yet another embodiment of the present disclosure.
Fig. 5 is a block diagram of a biometric identification system according to yet another embodiment of the present disclosure.
Fig. 6 is a block diagram of a biometric identification system according to yet another embodiment of the present disclosure.
Description of the reference numerals
10. Biometric identification system
100. Non-contact type biological recognition guiding device
101. Light projection device
1011. First light projection device
1012. Second light projection device
1013. Third light projection device
1014. Fourth light projection device
102. Optical filter device
103. An image pickup device.
Detailed Description
The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.
In addition, embodiments of the present disclosure and features of the embodiments may be combined with each other without conflict. The technical aspects of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Unless otherwise indicated, the exemplary implementations/embodiments shown are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Thus, unless otherwise indicated, features of the various implementations/embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concepts of the present disclosure.
The use of cross-hatching and/or shading in the drawings is typically used to clarify the boundaries between adjacent components. As such, the presence or absence of cross-hatching or shading does not convey or represent any preference or requirement for a particular material, material property, dimension, proportion, commonality between illustrated components, and/or any other characteristic, attribute, property, etc. of a component, unless indicated. In addition, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. While the exemplary embodiments may be variously implemented, the specific process sequences may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in reverse order from that described. Moreover, like reference numerals designate like parts.
When an element is referred to as being "on" or "over", "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements present. For this reason, the term "connected" may refer to physical connections, electrical connections, and the like, with or without intermediate components.
For descriptive purposes, the present disclosure may use spatially relative terms such as "under … …," under … …, "" under … …, "" lower, "" above … …, "" upper, "" above … …, "" upper "and" side (e.g., in "sidewall") to describe one component's relationship to another (other) component as illustrated in the figures. In addition to the orientations depicted in the drawings, the spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below … …" may encompass both an orientation of "above" and "below". Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising," and variations thereof, are used in the present specification, the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof is described, but the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximation terms and not as degree terms, and as such, are used to explain the inherent deviations of measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art.
Fig. 1 is a block diagram of a non-contact biometric guidance device 100 according to an embodiment of the present disclosure. Fig. 1 is a side view of a non-contact biometric guidance device 100.
As shown in fig. 1, the noncontact type biometric guidance device includes: at least one light projection device 101, the light projection device 101 being capable of projecting light to form a predetermined pattern on a surface of a subject; and a filter device 102, wherein the filter device 102 receives light from the surface of the object, reflects visible light from the received light from the surface of the object, and adjusts the relative position between the object and the filter device 102 based on the visible light reflected by the filter device 102.
An image that can be seen by the user is formed based on the visible rays reflected by the filter means 102.
Fig. 1 shows a light projection device 101, where the light projection device 101 is capable of projecting visible light in a certain direction (for example, a direction toward a subject to be photographed) to form a specific pattern (the pattern may be a circular/square/cross pattern, and the present disclosure does not particularly limit the pattern).
When a specific pattern projected by the light projection device 101 is irradiated to the surface of the object (for example, palm), the projected light is diffusely reflected on the surface of the object (for example, palm), and the reflected light is irradiated to the filter device 102.
The optical filter 102 has a function of reflecting visible light, and a user can see the reflected pattern and the relative position of the reflected pattern on the photographed object (e.g., palm) on the optical filter 102.
The user adjusts the object (e.g., palm) such that the reflected pattern reaches the correct position (e.g., the position of the pattern on the palm shown in fig. 2) on the object (e.g., palm) according to the relative position (the relative position includes the front, rear, left, right positions on the horizontal plane, the rotation, and the distance between the object and the filter device in the vertical direction) of the reflected pattern on the object (e.g., palm).
Preferably, the optical filter 102 includes a substrate layer and a coating layer disposed on the substrate layer.
Fig. 2 is a schematic view of a surface of the light filtering device 102 of the non-contact type biometric guiding device 100 forming a reflection pattern, i.e., a view of view angle a in fig. 1, according to an embodiment of the present disclosure.
Fig. 3 is a block diagram of the structure of the biometric identification system 10 according to one embodiment of the present disclosure, and fig. 3 is a side view of the biometric identification system 10. The biometric system 10 includes a contactless biometric guidance device 100.
As shown in fig. 3, the biometric identification system 10 includes: at least one light projection device 101, the light projection device 101 being capable of projecting light to form a predetermined pattern on a surface of a subject; the optical filter device 102, the optical filter device 102 receives the light from the surface of the shot object, reflects the visible light in the received light from the surface of the shot object, and adjusts the relative position between the shot object and the optical filter device 102 based on the visible light reflected by the optical filter device 102; and an image pickup device 103, the image pickup device 103 collecting light rays of a predetermined wavelength range transmitted through the filter device 102.
Wherein, the light projection device 101 is used for projecting a specific pattern on the surface of a shot object (such as palm); the filter device is used for reflecting visible light and transmitting light rays (such as infrared light) with preset wavelength; the image pickup device 103 is used for collecting an image of a photographed object and comparing and authenticating the biometric information, and the biometric identification process is completed, and the image pickup device 103 picks up the image of the photographed object surface by infrared rays to obtain the biometric information.
According to a preferred embodiment of the present disclosure, the light rays of the predetermined wavelength range described above are near infrared light.
According to a preferred embodiment of the present disclosure, the filter means 102 of the non-contact biometric guidance device 100 is an infrared filter element.
According to a preferred embodiment of the present disclosure, the filter device 102 is overlaid on the image pickup device 103. The filter 102 may be horizontally provided on the image pickup device 103 or may be provided on the image pickup device 103 at a predetermined inclination angle with respect to the image pickup device 103.
The noncontact biometric guidance device and biometric system of the present disclosure will be described in detail with reference to a palmar vein device (i.e., a biometric system) as an example.
The palm vein equipment comprises at least one light projection device, an infrared filter element and a palm vein camera device, wherein the light projection device is arranged at one side of the palm vein camera device. The light projection device projects a pattern with a specific shape on the surface of the palm, and the projected light is diffusely reflected on the surface of the palm and is reflected to the infrared filter element.
The infrared filter element has the function of reflecting visible light, and a user can see the reflected pattern and the relative position of the reflected pattern on the palm of the hand on the infrared filter element.
The user adjusts the palm to the correct position according to the relative position of the reflected pattern on the palm (the relative position includes the front, rear, left, right positions on the horizontal plane, rotation, and the distance between the photographed object and the device in the vertical direction). When the pattern seen on the infrared filter element is clear, the pattern is not distorted, and the center of the pattern is in the center area of the palm, the palm reaches the correct position, as shown in fig. 2.
Specifically, when the user views an image on the surface of the infrared filter element and the projected pattern is shifted from the palm center, that is, the user's palm is shifted horizontally, the user can move the palm in the front, back, left, and right directions in the horizontal plane of the palm until the pattern reaches the palm center.
When the projected pattern is distorted by the user's observed image on the surface of the infrared filter element, i.e., the user's palm is tilted, the user can rotate the palm and keep the palm and palm vein device level (parallel) until the observed pattern is consistent with that of fig. 2.
When the user observes an image on the surface of the infrared filter element, the palm or the pattern cannot be completely observed, that is, the distance between the palm of the user and the palm vein device is higher or lower, the user can properly raise or lower the palm until the pattern as shown in fig. 2 appears in the center of the palm can be observed on the infrared filter element.
Fig. 4 is a block diagram of a biometric identification system 10 according to yet another embodiment of the present disclosure. Fig. 4 is a side view of biometric identification system 10.
As shown in fig. 4, unlike the biometric system 10 shown in fig. 3, the number of light projection devices of the non-contact biometric guidance device of the biometric system 10 is two, namely, a first light projection device 1011 and a second light projection device 1012, the first light projection device 1011 being capable of projecting light to form a first portion of a predetermined pattern on the surface of the object to be photographed, the second light projection device 1012 being capable of projecting light to form a second portion of the predetermined pattern on the surface of the object to be photographed, the first portion and the second portion constituting a complete predetermined pattern.
Preferably, as shown in fig. 4, the first light projection device 1011 and the second light projection device 1012 are disposed at a first side and a second side of the filter device 102, respectively.
Fig. 5 is a block diagram of a biometric identification system 10 according to yet another embodiment of the present disclosure. Fig. 5 is a top view of biometric identification system 10.
As shown in fig. 5, the number of the light projection devices of the non-contact type biometric guidance device of the biometric system 10 is three, that is, the first light projection device 1011, the second light projection device 1012 and the third light projection device 1013, the first light projection device 1011 can project light to form a first portion of a predetermined pattern on the surface of the object, the second light projection device 1012 can project light to form a second portion of the predetermined pattern on the surface of the object, the third light projection device 1013 can project light to form a third portion of the predetermined pattern on the surface of the object, and the first portion, the second portion and the third portion constitute a complete predetermined pattern.
Preferably, as shown in fig. 5, the first, second and third light projection devices 1011, 1012 and 1013 are disposed at the first, second and third sides of the filter device 102, respectively.
Fig. 6 is a block diagram of a biometric identification system 10 according to yet another embodiment of the present disclosure. Fig. 6 is a top view of biometric identification system 10.
As shown in fig. 6, the number of the light projection devices of the noncontact biometric guidance device of the biometric system 10 is four, that is, a first light projection device 1011, a second light projection device 1012, a third light projection device 1013, and a fourth light projection device 1014, the first light projection device 1011 being capable of projecting light to form a first portion of a predetermined pattern on the surface of the object, the second light projection device 1012 being capable of projecting light to form a second portion of the predetermined pattern on the surface of the object, the third light projection device 1013 being capable of projecting light to form a third portion of the predetermined pattern on the surface of the object, the fourth light projection device 1014 being capable of projecting light to form a fourth portion of the predetermined pattern on the surface of the object, the first portion, the second portion, the third portion, and the fourth portion constituting a complete predetermined pattern.
Preferably, the first, second, third and fourth light projection devices 1011, 1012, 1013 and 1014 are disposed at the first, second, third and fourth sides of the filter device 102, respectively.
The noncontact biometric guidance device and biometric system of the present disclosure will be described in detail below with reference to a palmar vein device (i.e., a biometric system) as an example.
As shown in fig. 4,5 or 6, the palm vein device includes at least two light projection devices, and an infrared filter element, a palm vein image pickup device.
The light projection devices are distributed around the palm vein camera device (infrared filter element) and project one corner or a part of the pattern on the palm surface. The projections of the plurality of light projection devices on the palm surface can form a complete graph.
In the case of a palm vein device including two or more light projection means, the pattern projected by each light projection means may not be spliced into a complete pattern when the palm is shifted in horizontal position, rotated, and changed in vertical distance.
The projected light is diffusely reflected on the palm surface and is reflected to the infrared filter element, and the user sees the reflected pattern and the relative position of the reflected pattern on the palm (the relative position includes the front, back, left and right positions on the horizontal plane, rotation, and the distance between the photographed object and the device in the vertical direction) on the infrared filter element. When the projected pattern is clear and complete, the pattern is not distorted and the center of the pattern is in the center area of the palm, the palm reaches the correct position.
Specifically, when the projected pattern is shifted from the palm center in the image observed by the user on the surface of the infrared filter element, that is, the palm of the user is horizontally shifted, the user can move the palm in the front, back, left and right directions in the horizontal plane of the palm until the complete pattern reaches the palm center.
When the projected pattern is distorted by the image observed by the user on the surface of the infrared filter element, that is, the palm of the user is tilted, the user can rotate the palm, and the palm and the device are kept horizontal. Until the observed pattern is clear and complete, consistent with fig. 2.
When the user observes an image on the surface of the infrared filter element, the palm or figure cannot be completely observed, i.e., the distance between the palm of the user and the palm vein device is high or low, the user can properly raise or lower the palm until the complete figure as shown in fig. 2 appears in the center of the palm can be observed on the infrared filter element.
It should be noted that the light projection device may have a different layout from that of the above embodiments.
According to a preferred embodiment of the present disclosure, the filter means, such as an infrared filter element, is preferably prepared by optically coating a substrate, preferably an optical flat or a resin lens.
The optical coating technology is used, so that the requirements of transmitting or cutting off light in different wave bands can be met. The infrared filter element is prepared by an optical coating method, and light rays in other wave bands are prevented from transmitting by a reflection mode while infrared light in a specific wave band is transmitted.
For a biometric system, taking a palm vein device as an example, the requirements of the infrared filter element film system consider the following aspects:
(1) Light transmission wave band: the light source wave band used when the biological characteristic recognition system collects the image is satisfied. For example: when the palm vein camera system of the palm vein equipment is used for image acquisition, a near infrared light source with the wave band of 780nm-950nm is used, so that the infrared filter element has good permeability to near infrared light in the wave band range according to the film coating requirement in the preparation production process, and illumination light required by image acquisition can better penetrate the infrared filter element.
(2) Cut-off band: for the <780nm band, the cut-off band should be configured, i.e. cut-off light is transmitted by reflection. Thereby forming a mirror-like surface and realizing the effect of reflecting visible light. And >950nm band, may be configured as a cut-off band, reflecting light in this band. But it is considered that the light of this band has little influence on the palmar venous imaging system. Therefore, in the coating requirements, the light rays of the part of wave bands can not be controlled, so that the manufacturing cost is saved.
By this configuration, the infrared filter element can reflect the visible light of <780nm, i.e. the visible light emitted by the light projection device, and the pattern projected on the palm surface can be observed by the user by the reflection of the infrared filter element.
Other bands of light sources may be used for illumination among different non-contact biometric devices. The light transmission wave band and the cut-off wave band of the infrared filter element can be set in a targeted mode, and the functions of transmitting light rays of the illumination wave band and reflecting visible light are achieved.
According to one embodiment of the present disclosure, a non-contact type biometric guidance method for performing biometric guidance using the non-contact type biometric guidance device according to any one of the above embodiments, includes: using at least one light projection device to project light so as to form a preset pattern on the surface of a shot object; receiving light rays from the surface of the shot object by using a light filtering device, and reflecting visible light rays in the received light rays from the surface of the shot object; and adjusting the relative position between the photographed object and the light filtering device based on the visible light reflected by the light filtering device.
The non-contact type biological recognition guiding device and the method solve the problem that the correct shooting position is difficult to find rapidly in the using process of a biological feature recognition system such as non-contact type vein recognition equipment. By means of the optical guiding and the reflecting effect of the filtering element, the user can judge the relative position relation between the photographed object and the equipment actively, so that the photographed object can reach the correct position according to the movement.
The non-contact type biological recognition guiding device can replace the guiding function of display equipment and loudspeaker equipment in non-contact type biological recognition equipment or the positioning function of a bracket, so that the design of a non-contact type biological recognition product is simplified and miniaturized to the greatest extent. Is convenient for the integrated use of the product. And simultaneously, the cost can be reduced.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the present disclosure. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise.
It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.
Claims (14)
1. A noncontact biological identification guidance device, comprising:
At least one light projection device capable of projecting light to form a predetermined pattern on a surface of a subject; and
The optical filtering device receives light rays from the surface of the shot object, reflects visible light rays in the received light rays from the surface of the shot object, and adjusts the relative position between the shot object and the optical filtering device according to the relative position of the reflected pattern on the shot object based on the relative position of the reflected pattern on the shot object, wherein a user can see the reflected pattern and the relative position of the reflected pattern on the optical filtering device based on the visible light rays reflected by the optical filtering device; so that the reflected pattern reaches the correct position on the photographed object; wherein, the filter device is an infrared filter element.
2. The non-contact biometric guidance device of claim 1, wherein the optical filter device comprises a substrate layer and a coating layer disposed on the substrate layer.
3. The noncontact biological recognition guidance device according to claim 1, wherein biometric information of a human body is acquired based on an image of the subject.
4. The non-contact biometric guiding device as defined in claim 1, wherein the number of the light projection devices is two, namely a first light projection device capable of projecting light to form a first portion of a predetermined pattern on the surface of the photographed object and a second light projection device capable of projecting light to form a second portion of the predetermined pattern on the surface of the photographed object, the first portion and the second portion constituting the entire predetermined pattern.
5. The non-contact biometric guidance device of claim 4, wherein the first light projection device and the second light projection device are disposed on a first side and a second side of the filter device, respectively.
6. The non-contact biometric guiding device according to claim 1, wherein the number of the light projection devices is three, namely, a first light projection device capable of projecting light to form a first portion of a predetermined pattern on the surface of the photographed object, a second light projection device capable of projecting light to form a second portion of the predetermined pattern on the surface of the photographed object, and a third light projection device capable of projecting light to form a third portion of the predetermined pattern on the surface of the photographed object, the first portion, the second portion, and the third portion constituting the complete predetermined pattern.
7. The non-contact biometric guidance device of claim 6, wherein the first light projection device, the second light projection device, and the third light projection device are disposed on a first side, a second side, and a third side of the filter device, respectively.
8. The non-contact type biometric guiding device according to claim 1 or 2, wherein the number of the light projection devices is four, namely, a first light projection device capable of projecting light to form a first portion of a predetermined pattern on the surface of the object to be photographed, a second light projection device capable of projecting light to form a second portion of the predetermined pattern on the surface of the object to be photographed, a third light projection device capable of projecting light to form a third portion of the predetermined pattern on the surface of the object to be photographed, and a fourth light projection device capable of projecting light to form a fourth portion of the predetermined pattern on the surface of the object to be photographed, the first portion, the second portion, the third portion, and the fourth portion constituting the entire predetermined pattern.
9. The non-contact biometric guidance device of claim 8, wherein the first light projection device, the second light projection device, the third light projection device, and the fourth light projection device are disposed on a first side, a second side, a third side, and a fourth side of the filter device, respectively.
10. A non-contact type biometric guidance method, characterized in that the non-contact type biometric guidance device according to any one of claims 1 to 9 is used for biometric guidance, comprising:
using at least one light projection device to project light so as to form a preset pattern on the surface of a shot object;
Receiving light rays from the surface of the shot object by using a light filtering device, and reflecting visible light rays in the received light rays from the surface of the shot object; and
And adjusting the relative position between the shot object and the optical filter device based on the visible light rays reflected by the optical filter device.
11. A biometric system comprising the non-contact biometric guidance device of any one of claims 1 to 9, and an imaging device that captures light of a predetermined wavelength range transmitted through the filter device.
12. The biometric system of claim 11, wherein the filter is disposed horizontally on the camera.
13. The biometric system of claim 11, wherein the filter device is disposed on the camera device at a predetermined oblique angle to the camera device.
14. The biometric identification system as in any one of claims 11 to 13, wherein the filter device covers the camera device.
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