WO2016112546A1

WO2016112546A1 - Mobile terminal and vein identification device thereof

Info

Publication number: WO2016112546A1
Application number: PCT/CN2015/070921
Authority: WO
Inventors: 李久朝; 唐以彬
Original assignee: 深圳市维亿魄科技有限公司
Priority date: 2015-01-16
Filing date: 2015-01-16
Publication date: 2016-07-21

Abstract

A vein identification device for identifying finger vein is provided. The vein identification device comprises a light source, a reflection member and an infrared camera. The reflection member is arranged on one side of the light source, the infrared camera is arranged on the side of the reflection member far away from the light source, and the infrared camera are disposed opposite to the light source. The light from the light source is emitted to form a projection light beam which is projected onto the finger vein, the incident light beam is formed by the reflection of the finger vein, the incident light beam is incident on the reflective surface, the incident light beam is reflected by the reflective surface to form an imaging light beam, the imaging light beam is incident into the infrared camera, and the finger vein is imaged. The propagation directions of the incident light beam and the imaging light beam of the vein identification device are different, the accumulation of the light source, the reflection member and the infrared camera in one direction is avoided, and the thickness of the vein identification device can be reduced. A mobile terminal is also provided.

Description

Mobile terminal and vein recognition device thereof

[Technical Field]

The present invention relates to a biometric device, and more particularly to a mobile terminal and a vein recognition device thereof.

【Background technique】

Vein recognition is a type of biometric identification. The vein recognition system first obtains the individual vein distribution map through the vein recognition instrument, extracts the feature value from the vein distribution map according to the special comparison algorithm, acquires the image of the finger, the palm and the back vein of the hand through the infrared camera, and stores the digital image of the vein in the computer system. The feature value is stored. When the vein is compared, the vein map is taken in real time to extract the feature values, and the advanced filtering, image binarization and refinement methods are used to extract the features of the digital image, and the venous feature values are stored in the host, and a complex matching algorithm is used. The venous features are matched to identify individuals and confirm their identity. Human finger vein recognition is an emerging biometric identification technology. It is an important identity identification feature with uniqueness, stability, collectability and non-invasiveness.

With the development of mobile terminal payment functions, the security of mobile terminals has higher requirements. Applying the human finger vein recognition technology to the mobile terminal can greatly enhance the security of the mobile terminal. Biometric recognition technology based on finger veins is safer and more reliable than fingerprint recognition, and has considerable potential and important promotion value. However, in the vein recognition technology of the mobile terminal, the thickness of the finger vein recognition module is relatively large, and it is difficult to implement on the mobile phone.

[Summary of the Invention]

Based on this, it is necessary to provide a mobile terminal having a small thickness and a vein recognition device thereof.

A vein identification device for identifying a finger vein, comprising a light source, a reflector and an infrared camera, wherein the reflector is disposed on one side of the light source, and the infrared camera is disposed on the reflector away from the light source Side, the infrared camera is disposed opposite to the light source;

The light of the light source is emitted to form a projection beam, and the projection beam is projected on the finger vein, and is reflected by the finger vein to form an incident light beam, and the incident light beam is incident on the reflective surface, and the incident beam passes through The reflective surface reflection forms an imaging beam that is incident into the infrared camera to image the finger vein.

In one embodiment, an angle between an optical axis of the infrared camera and the reflective surface is 45 degrees, and the incident light beam is incident on the reflective surface at an angle of 45 degrees, and the incident beam passes through The reflection surface reflection is emitted at 45 degrees.

In one embodiment, the reflecting member is a right-angle prism, the plane of the oblique side of the right-angle prism is the reflecting surface, and the reflecting surface is provided with a reflective layer.

In one embodiment, the reflective layer is a metal plating.

In one embodiment, the light source is an LED light source, and the light intensity of the LED light source is adjustable.

In one embodiment, the base further includes a base, the base defines a light source slot for receiving the light source, and the light source slot is provided with a slit for transmitting light, and the light of the light source passes through the slit forming body. The projected beam.

In one embodiment, the slit has an elongated shape, and the slit extends in a direction perpendicular to a direction in which the incident light beam is located and a direction in which the imaging beam is located, and the width of the reflective surface is greater than or equal to The length of the slit.

In one embodiment, the LED light sources are plural, and the LED light sources are distributed along the extending direction of the slit.

In one of the embodiments, a side of the slit adjacent to the reflecting member is provided with a projection toward an outer side of the base, the projection being for positioning a position of the finger.

In one embodiment, the method further includes an infrared ray filter disposed on a side of the reflective member adjacent to the finger, the infrared permeable filter for filtering the incident light beam .

In one embodiment, the width of the infrared permeable filter is greater than or equal to the length of the slit.

In one embodiment, further comprising a lens group disposed on a side of the infrared camera adjacent to the reflective surface, the lens group for focusing the imaging beam to enable the An imaging beam is imaged onto the infrared lens.

In one of the embodiments, a lens mount is further included, the lens set being mounted on the lens mount.

In one embodiment, the mounting cover is further disposed on a side of the infrared camera away from the lens group, and the mounting cover fixedly connects the infrared camera and the lens mount.

A mobile terminal includes a body and the vein identification device, wherein the body is provided with a receiving slot, and the vein identifying device is received in the receiving slot.

The vein recognition device is formed by a light source to form a projection beam, and the projection beam is projected on the finger vein, and is reflected by the finger vein to form an incident beam. The incident beam is incident on the reflecting surface, and the incident beam is reflected by the reflecting surface to form an imaging beam. The imaging beam is incident into the infrared camera to image the finger vein. The direction of propagation of the incident beam and the imaging beam is different, and the light source, the reflector and the infrared camera are prevented from accumulating in one direction, which can reduce the thickness of the vein recognition device.

In the above mobile terminal, since the thickness of the vein recognition device is small, the depth of the receiving groove is small, so that the body of a small thickness can complete the installation of the vein identification device. The thickness of the mobile terminal is small, which satisfies the development trend of thinning of the mobile terminal, and is beneficial to the application of the vein recognition technology on the mobile terminal.

[Description of the Drawings]

1 is an exploded view of a mobile terminal of the present embodiment;

2 is a light path diagram of a vein recognition device of the mobile terminal shown in FIG. 1;

3 is a finger vein image collected by a conventional vein recognition device;

4 is a finger vein image collected by a vein recognition device of the mobile terminal shown in FIG. 1;

Fig. 5 is a view showing a state of use of the vein recognition device of the mobile terminal shown in Fig. 1;

【detailed description】

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are given in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be more fully understood.

It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or. The terms "vertical", "horizontal", "left", "right", and the like, as used herein, are for the purpose of illustration and are not intended to be the only embodiment.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 , the mobile terminal 10 of the present embodiment includes a body 11 and a vein recognition device 100 . The main body 11 is provided with a receiving groove 12, and the vein identifying device 100 is housed in the receiving groove 12. It can be understood that the vein recognition device 100 can be placed in a horizontal direction, a vertical direction, or other angles or positions according to the convenience or usage habit of the user of the mobile terminal 10.

The vein recognition device 100 of the present embodiment is for recognizing the finger vein 30. The vein recognition device 100 includes a light source 110, a reflector 130, and an infrared camera 150.

Referring to FIG. 2 at the same time, the light source 110 is disposed on one side of the reflector 130. The infrared camera 150 is disposed on a side of the reflector 130 away from the light source 110, and the infrared camera 150 is disposed opposite to the light source 110. Light from the source 110 exits to form a projected beam 21. The projected beam 21 is projected onto the finger vein 30 and reflected by the finger vein 30 to form the incident beam 22. The incident beam 22 is incident on the reflecting surface, and the incident beam 22 is reflected by the reflecting surface to form an imaging beam 23. The imaging beam 23 is incident into the infrared camera 150 to image the finger vein 30. For convenience of explanation, it is now prescribed that the direction in which the imaging beam 23 is located is the X-axis direction, the direction in which the incident beam 22 is located is the Y-axis direction, and the direction perpendicular to the incident beam 22 and the imaging beam 23 is the Z-axis direction.

In the vein recognition device 100 described above, the incident direction of the incident light beam 22 and the imaging beam 23 are different, and the light source 110 and the infrared camera 150 are not on the same line, and the thickness of the vein recognition device 100 in the Y direction can be reduced. When the thickness of the vein recognition device 100 is small, the depth of the receiving groove 12 is small, so that the body 11 of a small thickness can complete the installation of the vein identification device 100. The thickness of the mobile terminal 10 of the present embodiment in the Y direction is small, and the development trend of the thinning of the mobile terminal 10 is satisfied, which facilitates the application of the vein recognition technology on the mobile terminal 10.

Specifically, in the embodiment, the light source 110 is an LED light source, and the illumination intensity of the LED light source is adjustable. Also, there are a plurality of LED light sources. The LED light source is connected in series with a variable resistor (not shown), and the light intensity of the LED light source is changed by adjusting the resistance of the variable resistor. It will be appreciated that in other embodiments, varying the illumination intensity of the LED source, the voltage of each LED source can also be adjusted.

The vein identification device 100 also includes a base 120. The base 120 defines a light source slot 121 for accommodating the light source 110. Specifically, in the present embodiment, the base 120 is made of an opaque material. The vein identification device 100 further includes a light source tank cover 122 having a cross section identical to the shape of the cross section of the light source groove 121. One end of the light source groove 121 is an open end, and the light source 110 enters the light source groove 121 from the open end, and the light source groove cover 122 seals the open end. The light source tank cover 122 seals the light source groove 121 to position the light source 110 in the light source groove 121.

The light source groove 121 is provided with a slit 123 in the Z-axis direction. The slit 123 has an elongated shape, and the extending direction of the slit 123 is perpendicular to the direction in which the incident light beam 22 is located and the direction in which the imaging light beam 23 is located. A plurality of LED light sources are distributed along the extending direction of the slit 123. The light of the light source 110 forms a projected beam 21 through the slit 123. The projected beam 21 is elongated. The elongated projection beam 21 is incident on the finger vein 30, and the incident beam 22 reflected by the finger vein 30 is also elongated.

Since the finger joints are more likely to transmit light, the conventional vein recognition device 100 causes the brightness of the joints in the finger veins collected by the infrared camera 150 to be large, resulting in uneven brightness of the finger veins 30, see FIG. , affecting the image processing of subsequent finger vein 30 recognition. Specifically, in the present embodiment, since the brightness of the LED light source can be adjusted, and the intensity of the LED light source is adjusted according to the position of the finger joint, the light intensity of the elongated projection beam 21 can be adjusted along the extending direction of the slit 123. Therefore, the intensity of the LED light source near the position of the finger joint is low, and the intensity of the LED light source far from the position of the finger joint will be high. By adjusting the light intensity of the projected beam 21, the intensity of the incident light beam 22 reflected from the finger vein 30 is relatively uniform, and therefore, the intensity distribution of the finally formed imaging beam 23 is relatively uniform. According to the position of the finger joint to adjust the intensity of the LED light source, a finger vein map with relatively uniform brightness can be obtained. Please refer to FIG. 4 to better complete the image processing of the finger vein 30 recognition.

A protrusion (not shown) is provided on a side of the slit 123 near the reflector 130 toward the outside of the base 120. The projections are used to position the finger 31. The projections are used for lateral positioning of the fingers 31, reducing the efficiency of vein recognition due to lateral movement and rotation of the fingers 31. The protrusion can also resist part of the infrared light from the slit 123 to directly enter the infrared camera 150 through the surface of the finger 31, thereby reducing the interference of the light on the finger vein 30 map.

Specifically, in the embodiment, the base 120 is further provided with a reflection groove (not labeled) for accommodating the reflector 130 and the infrared camera 150. The reflection groove is provided with a light entrance 126, and the opening direction of the light entrance 126 is perpendicular to the axial direction of the reflection groove.

The reflector 130 is disposed opposite to the light entrance 126, and the infrared camera 150 is disposed at an end of the reflection slot away from the reflector 130.

Specifically, in the present embodiment, the reflector 130 is a right-angle prism. The bottom of the groove of the reflecting groove is provided with a slope (not shown) so that the oblique side of the right-angle prism abuts the inclined surface to position the right-angle prism. The plane in which the oblique side of the right-angle prism is located is the reflecting surface 131. The reflective surface 131 is plated with a reflective layer. The reflective layer is a metal plating layer such as an Hg plating layer, an Ag plating layer, or the like.

The projected light beam 21 is projected onto the finger vein 30, and diffuse reflection occurs on the surface of the finger vein 30, and the incident light beam 22 at an angle of 45 degrees to the reflecting surface enters the light entrance port 126. Therefore, the incident light beam 22 is incident on the reflecting surface 131 at an angle of 45 degrees, and the incident light beam 22 is reflected by the reflecting surface 131 to be emitted at 45 degrees. The incident beam 22 is elongated, and the imaging beam 23 reflected by the reflecting surface 131 is also elongated. In other embodiments, the reflector 130 can also be a mirror.

The vein identification device 100 also includes an infrared permeable filter 140. The infrared ray filter 140 is disposed on a side of the reflector 130 near the finger 31, and the infrared ray filter 140 is used to filter the incident beam 22. The infrared ray filter 140 is fixedly disposed at the light entrance 126. The infrared ray filter 140 can filter stray light in the environment, reduce stray light entering the reflecting groove, interfere with the finger vein pattern, and improve the accuracy of the vein identifying device 100.

In other embodiments, the infrared ray filter 140 may be omitted when the light source 110 is an infrared illumination source.

The angle between the optical axis of the infrared camera 150 and the reflecting surface 131 is 45 degrees, and the incident beam 22 is reflected by the reflecting surface 131 to form an imaging beam 23 at 45 degrees. In the vein identification device 100 described above, the angle between the incident beam 22 and the imaging beam 23 is 90 degrees, and the reflector 130 changes the direction of the incident beam 22 so that the desired optical components do not have to be stacked in one direction, so that the vein identification device is The thickness of 100 in the direction of the Y-axis is small.

It can be understood that in other embodiments, the angle between the optical axis of the infrared camera 150 and the reflective surface 131 can also be other angles, such as 30 degrees, 40 degrees, and the like. It is also possible to make the required optical components do not have to be stacked in one direction of the Y-axis, so that the thickness of the vein identification device 100 in the direction of the Y-axis is small.

The imaging beam 23 enters the infrared camera 150 for imaging. Since the incident beam 22 is elongated, the imaging beam 23 is also elongated, that is, the image formed on the infrared camera 150 is the finger vein map corresponding to the slit 123. The width of the reflecting surface 131 is greater than or equal to the length of the slit 123. The width of the reflecting surface 131 is the length of the reflecting surface 131 along the extending direction of the slit 123, that is, the width of the reflecting surface 131 is the length of the reflecting surface 131 in the Z-axis direction. The width of the infrared permeable filter 140 is greater than or equal to the length of the slit 123. The width of the infrared ray filter 140 is the length of the infrared ray filter 140 along the extending direction of the slit 123, that is, the width of the infrared ray filter 140 is the length of the infrared ray filter 140 in the Z-axis direction.

Specifically, in the present embodiment, the length of the slit 123 is the same as the width of the reflector 130, and the width of the reflecting surface 131 is the same as the width of the infrared permeable filter 140. When the length of the slit 123 is long, the extracted finger vein 30 has more data. Since the incident beam 22 and the imaging beam 23 are both elongated, the width of the reflecting surface 131 and the width of the infrared permeable filter 140 are both greater than or equal to narrow. The length of the slit 123 is such as to ensure the integrity of the incident beam 22. For the mobile payment function with higher safety factor, a longer slit 123, a wider reflector 130 and a wider infrared filter 140 can be selected to ensure more information about the human finger vein 30 and improve mobile payment. Security.

Further, referring to FIG. 5, when the finger vein is collected by the mobile terminal 10 including the vein recognition device 100, the finger 31 can be placed over the slit 123 to complete the collection. The mobile terminal 10 does not need to move the finger 31, and the vein feature of the finger 31 can be acquired at one time, and it is not necessary to collect a plurality of vein image stitching to acquire the vein feature of the complete finger 31.

Specifically, in the present embodiment, the vein recognition device 100 further includes a lens group 160 and a lens mount 170. The lens group 160 is mounted on the lens mount 170. The lens group 160 is disposed on a side of the infrared camera 150 near the reflecting surface 131. The lens group 160 is used to focus the imaging beam 23 to form the imaging beam 23 on the infrared camera 150. Specifically, the lens group 160 includes a convex lens 161 and a concave lens 162. By adjusting the focal length of the convex lens 161 and the concave lens 162, the imaging light beam 23 can be focused on the infrared camera 150, and the sharpness of imaging of the infrared camera 150 is ensured.

The vein recognition device 100 described above further includes a mounting cover 180. The mounting cover 180 is disposed on a side of the infrared camera 150 that is away from the lens group 160. The mounting cover 180 is fixedly coupled to the infrared camera 150 and the lens mount 170. The mounting cover 180 positions the infrared camera 150 to prevent the infrared camera 150 from shaking, which affects the vein imaging effect of the vein recognition device 100 described above.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A vein identification device for identifying a finger vein, comprising: a light source, a reflection member and an infrared camera, wherein the reflection member is disposed at one side of the light source, and the infrared camera is disposed at the reflection member away from the One side of the light source, the infrared camera is disposed opposite to the light source;

The light of the light source is emitted to form a projection beam, and the projection beam is projected on the finger vein, and is reflected by the finger vein to form an incident light beam, and the incident light beam is incident on the reflective surface, and the incident beam passes through The reflective surface reflection forms an imaging beam that is incident into the infrared camera to image the finger vein.
The vein recognition device according to claim 1, wherein an angle between an optical axis of the infrared camera and the reflecting surface is 45 degrees, and the incident light beam is incident on the reflecting surface at an angle of 45 degrees. Above, the incident light beam is reflected by the reflecting surface to be emitted at 45 degrees.
According to claim 1, the reflecting member is a right-angle prism, and a plane where the oblique side of the right-angle prism is located is the reflecting surface, and the reflecting surface is provided with a reflecting layer.
The vein recognition device according to claim 3, wherein the reflective layer is a metal plating layer.
The vein recognition device according to claim 1, wherein the light source is an LED light source, and an illumination intensity of the LED light source is adjustable.
The vein identification device according to claim 5, further comprising a base, the base is provided with a light source slot for receiving the light source, and the light source slot is provided with a slit for transmitting light, the light source Light passes through the slit to form the projected beam.
The vein identification device according to claim 6, wherein the slit is elongated, and the slit extends in a direction perpendicular to a direction in which the incident light beam is located and a direction in which the imaging beam is located. The width of the reflecting surface is greater than or equal to the length of the slit.
The vein recognition device according to claim 7, wherein the plurality of LED light sources are distributed, and the LED light sources are distributed along an extending direction of the slit.
The vein recognition device according to claim 7, wherein a side of the slit near the reflecting member is provided with a projection toward an outer side of the base, and the projection is for positioning a position of the finger.
The vein identification device according to claim 7, further comprising an infrared ray filter, wherein the infrared ray filter is disposed on a side of the reflector adjacent to the finger, the infrared ray filter A sheet is used to filter the incident beam.
The vein recognition device according to claim 10, wherein the width of the infrared permeable filter is greater than or equal to the length of the slit.
The vein recognition device according to claim 1, further comprising a lens group disposed on a side of the infrared camera adjacent to the reflecting surface, wherein the lens group is for the imaging beam Focusing is performed to image the imaging beam onto the infrared lens.
The vein identification device according to claim 12, further comprising a lens mount mounted on the lens mount.
The vein identification device according to claim 13, further comprising a mounting cover, the mounting cover being disposed on a side of the infrared camera remote from the lens group, the mounting cover being fixedly connected to the infrared camera and The lens mount.
A mobile terminal, comprising: a body and the vein identification device according to any one of claims 1 to 14, wherein the body is provided with a receiving groove, and the vein identifying device is housed in the receiving groove.