A high-resolution pressure fingerprinting apparatus

Abstract

The application discloses a high-resolution pressure fingerprint collection instrument, which comprises a light source processing device and a fingerprint collection device; the light source processing device comprises a light channel body, a light diffusing plate and a convex lens; one end of the light channel body is provided with an incident light source interface, the light diffusing plate is movably arranged in the light channel body, and the other end of the light channel body is provided with the convex lens; the fingerprint collection device is communicated with the light channel body, and the fingerprint collection device comprises a collection box body and a camera; the upper plane and the lower bottom surface of the collection box body are both provided with openings, the upper plane is provided with a transparent glass, the transparent glass and the upper plane are provided with a pressure strain gauge, the camera is aligned with the opening of the upper plane through the opening of the lower bottom surface, and the collection box body is internally provided with a semi-translucent lens which can rotate up and down; the application can effectively collect a fingerprint picture and a pressure value when a finger is pressed to collect the fingerprint, and effectively improves the practicability of the application.

Description

Technical Field

[0001] The present invention relates to the technical field of fingerprint collection, and more particularly to a high-resolution pressure fingerprint collection device. Background Art

[0002] First, fingerprint testing involves both on-site fingerprint testing and sample fingerprint testing. Sample fingerprint collection has evolved from a single ink-based fingerprint collection method to a live fingerprint collection method, supplemented by ink-based fingerprint collection. Live fingerprints must be collected using a fingerprint collection device and then entered into the system for feature search and comparison. Therefore, the quality of the collected fingerprints plays a crucial role in subsequent testing and identification.

[0003] Secondly, fingerprint inspections typically utilize secondary fingerprint features, or macroscopic features. However, with the continuous development of basic fingerprint inspection theory, more and more fingerprint inspectors are beginning to emphasize the role of tertiary fingerprint features, or microscopic features. To observe these microscopic features for inspection and identification, the quality of the fingerprint collection equipment is crucial.

[0004] However, existing fingerprint collection devices suffer from insufficient fingerprint clarity. Domestic fingerprint collection devices currently have a resolution of 500 dpi, while those used abroad only have a resolution of 1000 dpi. Both resolutions are only sufficient for comparing and identifying secondary fingerprint features, but lack the clarity to compare and identify tertiary fingerprint features. Because fingerprints at the scene are often blurred, incomplete, or deformed, there may not be sufficient secondary features for comparison and identification, rendering the fingerprint's evidentiary value useless and hindering case detection.

[0005] In addition, the size and direction of pressure will affect the shape of fingerprint features. Existing fingerprint collection devices cannot record the pressure applied by the finger when collecting fingerprints. They often use vague words to describe it, such as light pressure, medium pressure, and heavy pressure. This makes it impossible to scientifically analyze and identify sample fingerprints.

[0006] Therefore, how to provide a high-resolution pressure fingerprint collector is a problem that those skilled in the art urgently need to solve. Summary of the Invention

[0007] In view of this, the present invention provides a high-resolution pressure fingerprint collector that can effectively collect fingerprint images and the pressure value when the finger presses to collect the fingerprint, effectively improving the practicality of the present invention.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A high-resolution pressure fingerprint collector, comprising: a light source processing device and a fingerprint collection device;

[0010] The light source processing device includes a light channel body, a diffuser plate and a convex lens; one end of the light channel body is provided with an incident light source interface, the diffuser plate is movably arranged inside the light channel body, and the other end of the light channel body is provided with a convex lens;

[0011] The fingerprint collection device is in communication with the optical channel body and includes a collection box and a camera. The upper plane and the lower bottom surface of the collection box are both provided with openings. Transparent glass is provided on the upper plane, and a pressure strain gauge is provided between the transparent glass and the upper plane. The camera is aligned with the opening of the upper plane through the opening of the lower bottom surface. A semi-mirror that can rotate up and down is provided inside the collection box.

[0012] The light source enters the light channel body from the incident light source interface, passes through the convex lens after diffuse reflection by the diffuser, enters the collection box, is refracted by the semi-mirror to the opening of the upper plane, and is reflected by the finger pressed on the transparent glass to the semi-mirror, and passes through the semi-mirror to the lens of the camera;

[0013] The camera is used to capture an image of the fingerprint of the finger;

[0014] The pressure strain gauge is used to collect the pressure value applied by the finger.

[0015] Preferably, a groove is provided on the upper plane of the light channel body, and a first protruding structure is provided on the upper edge of the diffuser plate, the first protruding structure passes through the groove, and the diffuser plate is controlled to move within the light channel body through the first protruding structure.

[0016] Preferably, an arc-shaped groove is provided on the upper plane of the collection box, the half-mirror is installed in the collection box through a connecting shaft, and a second protrusion structure is provided on the upper edge of the half-mirror and passes through the arc-shaped groove, and the rotation of the half-mirror in the collection box is controlled by the second protrusion structure.

[0017] Preferably, it further comprises a host computer, wherein the host computer is electrically connected to the camera and the pressure strain gauge respectively;

[0018] The host computer is used to receive the collected fingerprint image and pressure value.

[0019] Preferably, an acquisition circuit is connected between the host computer and the pressure strain gauge;

[0020] The acquisition circuit is used for acquiring the pressure value received by the pressure strain gauge and transmitting to the upper computer.

[0021] Via the technical solution, compared with the prior art, the high-resolution pressure fingerprint acquisition instrument has the following beneficial effects:

[0022] First, the resolution of the existing product is improved. The light source processing device in the application changes the entering light source into uniform parallel light, which can significantly increase the contrast of the fingerprint groove when hitting the fingerprint. The light is refracted by the half lens to the fingerprint and then enters the camera, which reduces the color and effectively improves the resolution of the application. Therefore, a clearer image can be obtained, so the application can be used for fingerprint microscopic feature inspection. The camera in the application can be directly disassembled and installed, which facilitates the replacement of cameras of various resolution levels and improves the practicality of the application. It is of great significance for effective use of fingerprint evidence.

[0023] Second, the function of acquiring pressure values is introduced into the fingerprint acquisition instrument, which can combine pressure values with fingerprint images to observe the subtle structural changes of fingerprint microscopic features under different pressures, which is beneficial for the use of fingerprint evidence and can also be used for studying the relationship between pressure and fingerprint, effectively improving the practicality of the application. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0025] Figure 1 The drawing is a front view of the light source processing device provided by the application;

[0026] Figure 2 The drawing is a top view of the fingerprint acquisition device provided by the application without transparent glass and pressure strain gauge;

[0027] Figure 3 The drawing is a top view of the transparent glass and pressure strain gauge provided by the application;

[0028] Figure 4 The drawing is a top view of the high-resolution pressure fingerprint acquisition instrument provided by the application without transparent glass and pressure strain gauge;

[0029] 1-incident light source interface, 2-diffuser plate, 3-convex lens, 4-light channel body, 5-collection box, 6-camera, 7-semi-mirror, 8-transparent glass, 9-pressure strain gauge, 10-groove, 11-first convex structure, 12-arc groove, 13-second convex structure, 14-connecting axis. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] The embodiment of the present invention discloses a high-resolution pressure fingerprint acquisition device, comprising: a light source processing device and a fingerprint acquisition device;

[0032] like Figure 1 As shown, the light source processing device includes a light channel body 4, a diffuser plate 2 and a convex lens 3; an incident light source interface 1 is provided at one end of the light channel body 4, the diffuser plate 2 is movably arranged inside the light channel body 4, and a convex lens 3 is provided at the other end of the light channel body 4;

[0033] like Figure 2-3 As shown, the fingerprint collection device is connected to the optical channel body 4 and includes a collection box 5 and a camera 6. The upper plane and the lower bottom surface of the collection box 5 are both provided with openings. A transparent glass 8 is provided on the upper plane. A pressure strain gauge 9 is provided between the transparent glass 8 and the upper plane. The camera 6 is aligned with the opening of the upper plane through the opening of the lower bottom surface. A semi-transparent mirror 7 that can rotate up and down is provided inside the collection box 5.

[0034] The light source enters the optical channel body 4 from the incident light source interface 1, is diffusely reflected by the diffuser 2, and then enters the collection box 5 through the convex lens 3. It is refracted by the semi-transparent mirror 7 to the opening of the upper plane. The light is reflected by the finger pressed on the transparent glass 8 to the semi-transparent mirror 7, and then passes through the semi-transparent mirror 7 to the lens of the camera 6.

[0035] The camera 6 is used to capture the fingerprint of the finger;

[0036] The pressure strain gauge 9 is used to collect the pressure value applied by the finger.

[0037] In order to further implement the above technical solution, a groove 10 is provided on the upper plane of the light channel body 4, and a first protruding structure 11 is provided on the upper edge of the diffuser plate 2. The first protruding structure 11 passes through the groove 10, and the diffuser plate 2 is controlled to move in the light channel body 4 through the first protruding structure 11.

[0038] In order to further implement the above technical solution, an arc-shaped groove 12 is provided on the upper plane of the collection box 5, and the half mirror 7 is installed in the collection box 5 through the connecting shaft 14, and a second protrusion structure 13 is provided on the upper edge of the half mirror 7 and passes through the arc-shaped groove 12. The rotation of the half mirror 7 in the collection box 5 is controlled by the second protrusion structure 13.

[0039] In order to further implement the above technical solution, a host computer is also included, which is electrically connected to the camera 6 and the pressure strain gauge 9 respectively;

[0040] The host computer is used to receive the collected fingerprint image and pressure value.

[0041] In order to further implement the above technical solution, an acquisition circuit is connected between the host computer and the pressure strain gauge 9;

[0042] The acquisition circuit is used to collect the pressure value received by the pressure strain gauge 9 and transmit it to the host computer.

[0043] The working principle of this embodiment is:

[0044] Press your finger against the transparent glass 8. Light enters the optical channel body 4 from the incident light source interface 1. After diffuse reflection from the diffuser 2, it passes through the convex lens 3 and enters the collection box 5. It is refracted by the semi-transparent mirror 7 to the opening of the upper plane. The light is reflected by the finger pressed on the transparent glass 8 onto the semi-transparent mirror 7 and passes through the semi-transparent mirror 7 to the lens of the camera 6. The camera 6 takes a real-time picture of the fingerprint and sends it to the host computer. The acquisition circuit collects the pressure received by the pressure strain gauge 9, converts the analog signal into a digital signal, and sends it to the host computer in real time. In addition, a pressure threshold can be set in the host computer. Once the pressure exceeds the pressure threshold, the host computer controls the camera 6 to take a picture and record the fingerprint image.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0046] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-resolution pressure fingerprint collector, characterized in that: include: Light source processing device, fingerprint collection device and host computer; The light source processing device comprises a light channel body (4), a diffuser plate (2) and a convex lens (3); an incident light source interface (1) is provided at one end of the light channel body (4); the diffuser plate (2) is movably arranged inside the light channel body (4); and a convex lens (3) is provided at the other end of the light channel body (4); The fingerprint collection device is in communication with the optical channel body (4), and comprises a collection box (5) and a camera (6). The upper plane and the lower bottom surface of the collection box (5) are both provided with openings. A transparent glass (8) is provided on the upper plane. A pressure strain gauge (9) is provided between the transparent glass (8) and the upper plane. The camera (6) is aligned with the opening of the upper plane through the opening of the lower bottom surface. A semi-mirror (7) that can be rotated up and down is provided inside the collection box (5); an acquisition circuit is connected between the host computer and the pressure strain gauge (9); the acquisition circuit is used to acquire the pressure value received by the pressure strain gauge (9) and transmit it to the host computer; The host computer is electrically connected to the camera (6) and the pressure strain gauge (9) respectively; the host computer is used to receive the collected fingerprint image and pressure value; The light source enters the light channel body (4) from the incident light source interface (1), passes through the convex lens (3) after diffuse reflection by the diffuser plate (2), enters the collection box (5), passes through the semi-mirror (7) to the opening of the upper plane, and is reflected by the finger pressed on the transparent glass (8) to the semi-mirror (7), and passes through the semi-mirror (7) to the lens of the camera (6); The camera (6) is used to capture the fingerprint image of the finger; The pressure strain gauge (9) is used to collect the pressure value applied by the finger; The upper plane of the light channel body (4) is provided with a groove (10), the upper edge of the light diffuser (2) is provided with a first protruding structure (11), the first protruding structure (11) passes through the groove (10), and the light diffuser (2) is controlled to move in the light channel body (4) through the first protruding structure (11); An arc groove (12) is provided on the upper plane of the collection box (5), and the half mirror (7) is installed in the collection box (5) through a connecting shaft (14). A second protruding structure (13) is provided on the upper edge of the half mirror (7) and passes through the arc groove (12). The rotation of the half mirror (7) in the collection box (5) is controlled by the second protruding structure (13).

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