CN110646442A - Portable fingerprint extraction equipment - Google Patents
Portable fingerprint extraction equipment Download PDFInfo
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- CN110646442A CN110646442A CN201911021309.8A CN201911021309A CN110646442A CN 110646442 A CN110646442 A CN 110646442A CN 201911021309 A CN201911021309 A CN 201911021309A CN 110646442 A CN110646442 A CN 110646442A
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- light source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a portable fingerprint extraction device, comprising: the device comprises a rectangular case, a controller, a first multiband light source, a moving mechanism and an image acquisition device, wherein the first multiband light source, the moving mechanism and the image acquisition device are respectively and electrically connected with the controller; a first side surface of the rectangular case is provided with a light outlet, a semitransparent plate is arranged at the light outlet, the first multiband light source is arranged in the rectangular case, and light generated by the first multiband light source is emitted out through the semitransparent plate; the second side surface of the rectangular case is provided with a moving mechanism, and the moving mechanism is used for adjusting the position of the image acquisition device; the image acquisition device and the first side set up relatively, and the image acquisition device is used for carrying out image acquisition to the material on the first side, and the image acquisition device conveys the image information who gathers to the controller, and the controller carries out the extraction of fingerprint according to the image information who receives. The device can realize the fingerprint information extraction of the original piece of the on-site material to be detected and the original piece of the sample material.
Description
Technical Field
The invention relates to the technical field of image processing, in particular to portable fingerprint extraction equipment.
Background
With the progress of science and technology, judicial identification has gradually become a marketable social service work, the materials related to identification cases in the identification work of visible fingerprints on documents are all paper materials, and due to the protection of an identification consignor on evidences, the problem that original papers related to the cases or original materials of sample materials cannot be provided to an identification mechanism occurs occasionally, so that a barrier is formed to the work of extracting the materials or the samples, further detailed examination cannot be completed, and meanwhile, the visible fingerprints on the documents are also qualified.
In the current judicial identification work, equipment for extracting digital images of visible fingerprint original documents on outgoing sites is limited to digital cameras and scanners, and portable, multifunctional and efficient extraction equipment is not available.
Disclosure of Invention
In view of the above technical shortcomings, it is an object of the present invention to provide a portable fingerprint extraction device capable of extracting fingerprint information from a material to be inspected and a sample material original in the field.
In order to achieve the purpose, the invention provides the following scheme:
a portable fingerprint extraction device, the fingerprint extraction device comprising: the device comprises a rectangular case, a controller, a first multiband light source, a moving mechanism and an image acquisition device, wherein the first multiband light source, the moving mechanism and the image acquisition device are electrically connected with the controller respectively;
a light outlet is formed in a first side face of the rectangular case, a semi-transparent plate is arranged at the light outlet, the first multiband light source is arranged in the rectangular case, and light generated by the first multiband light source is emitted through the semi-transparent plate;
a moving mechanism is arranged on the second side face of the rectangular case and used for adjusting the position of the image acquisition device;
the image acquisition device is arranged opposite to the first side surface and used for acquiring images of the material on the first side surface, the image acquisition device transmits acquired image information to the controller, and the controller extracts fingerprints according to the received image information.
Optionally, the moving mechanism includes: the support rod, the first adjusting screw rod with the telescopic function, the second adjusting screw rod with the telescopic function and the servo motor are arranged on the second side face, a sliding rail parallel to the plane where the first side face is located is arranged on the second side face, one end of the support rod slides on the sliding rail through a sliding block, the controller is electrically connected with the servo motor, and the controller controls the sliding of the sliding block through the servo motor;
the other end of the supporting rod is connected with one end of the first adjusting screw rod at a first angle, the other end of the first adjusting screw rod is connected with one end of the second adjusting screw rod at a second angle, and the other end of the second adjusting screw rod is connected with the image acquisition device;
the controller is respectively electrically connected with the first adjusting screw and the second adjusting screw and is used for controlling the expansion amount of the first adjusting screw and/or the second adjusting screw.
Optionally, the degrees of the first angle and the second angle are both 90 °.
Optionally, the image capturing device includes: the second multiband light source is an annular light source, and the camera is arranged in the annular light source; the controller is electrically connected with the camera and used for controlling the focal length of the camera.
Optionally, the image capturing device further includes: the second multiband light source is arranged at one end of the telescopic light shield, the other end of the telescopic light shield is opposite to the first side face, the telescopic light shield is electrically connected with the controller, and the controller is used for controlling the extension and/or the shortening of the telescopic light shield.
Optionally, the image capturing device further includes: the side light source is arranged on the inner wall of one end of the telescopic light shield, the controller is electrically connected with the side light source, and the controller is used for controlling the side light source to be opened and closed.
Optionally, the camera is a zoom camera.
Optionally, the first side and the second side are adjacent.
Optionally, the translucent plate is made of ground glass.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the portable fingerprint extraction equipment, the position of the image acquisition device is adjusted through the moving mechanism, the material on the first side surface can be subjected to image acquisition through the image acquisition device, the controller extracts fingerprints according to the received image information, the fingerprint information extraction of the original piece of the on-site inspection material and the original piece of the sample material can be realized through the equipment, and the extraction efficiency of the original piece of the identification material is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a portable fingerprint extraction device according to the present invention;
fig. 2 is a schematic view of the internal structure of the image capturing device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a portable fingerprint extraction device which can extract fingerprint information of on-site material to be detected and original sample materials.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a portable fingerprint extraction device of the present invention, and as shown in fig. 1, the portable fingerprint extraction device includes: the device comprises a rectangular case 1, a controller, a first multiband light source, a moving mechanism and an image acquisition device, wherein the first multiband light source, the moving mechanism and the image acquisition device are respectively and electrically connected with the controller.
A light outlet 2 is arranged on a first side surface of the rectangular case 1, a semitransparent plate 3 is arranged at the light outlet 2, the first multiband light source is arranged in the rectangular case 1, and light generated by the first multiband light source is emitted through the semitransparent plate 3.
Specifically, in the embodiment of the present invention, the rectangular chassis 1 has a length of 42cm × a width of 22cm × a height of 12cm, the first multiband light source is disposed in the middle of the rectangular chassis 1, that is, in the middle of the light outlet 2, the first multiband light source can be suspended, the first multiband light source is used for reflection photographing, a function of transmitting the bottom of a material to be inspected or a sample material file is realized, a good visual effect can be obtained, and light generated by the first multiband light source is emitted through the translucent plate 3, so that uniform transmission of the light source can be realized.
The first multiband light source is purple light in the 400-430nm segment, blue light or green light in the 495-510nm segment, and yellow orange light or white light in the 550-700nm segment.
A first multiband light source control key 11 is arranged on the third side surface of the rectangular case 1 and is used for controlling the opening and closing of the first multiband light source and the type of the light source.
And a moving mechanism is arranged on the second side surface of the rectangular case 1 and used for adjusting the position of the image acquisition device.
The moving mechanism in the embodiment of the invention comprises: bracing piece 4, first adjusting screw 5, second adjusting screw 6 and the servo motor that have flexible function, the second side be provided with first side place parallel to the plane's slide rail 7, 4 one ends of bracing piece are passed through the slider and are in slide on the slide rail 7, the controller with the servo motor electricity is connected, the controller utilizes the slip of servo motor control slider.
The other end of the supporting rod 4 and one end of the first adjusting screw rod 5 are connected at a first angle, the other end of the first adjusting screw rod 5 and one end of the second adjusting screw rod 6 are connected at a second angle, and the other end of the second adjusting screw rod 6 and the image acquisition device are connected.
The controller is respectively electrically connected with the first adjusting screw 5 and the second adjusting screw 6, and the controller is used for controlling the expansion amount of the first adjusting screw 5 and/or the second adjusting screw 6.
Preferably, the degrees of the first angle and the second angle are both 90 °.
A moving mechanism control key 12 is further disposed on a third side of the rectangular case 1, and is used for adjusting the position of the image acquisition device.
The vertical distance between the image acquisition device and the light outlet 2 can be changed by the extension and/or shortening of the first adjusting screw 5, namely the height adjustment is completed; the relative position of the image acquisition device and the light outlet 2 can be changed by the extension and/or shortening of the second adjusting screw 6, namely, the left and right adjustment is completed; the slide block slides on the slide rail 7 to drive the support rod 4 to move, namely, the front and back adjustment is completed.
The image acquisition device is arranged opposite to the first side surface and used for acquiring images of the material on the first side surface, the image acquisition device transmits acquired image information to the controller, and the controller extracts fingerprints according to the received image information.
In the embodiment of the invention, the control process of extracting the fingerprint by the controller according to the received image information is not protected, and the equipment in the embodiment of the invention is protected.
The image acquisition device in the embodiment of the invention comprises: the device comprises a second multiband light source 9 and a camera 8, wherein the second multiband light source 9 is an annular light source, and the camera 8 is arranged in the annular light source; the second multiband light source 9 is used for generating different color light, the controller is electrically connected with the second multiband light source 9, the controller is used for controlling the second multiband light source 9 to generate light sources with different wavebands, the controller is electrically connected with the camera 8, and the controller is used for controlling the focal length of the camera 8.
Preferably, the image capturing apparatus further includes: the second multiband light source 9 is arranged at one end of the telescopic light shield 10, the other end of the telescopic light shield 10 is arranged opposite to the first side face, the telescopic light shield 10 is electrically connected with the controller, and the controller is used for controlling the telescopic light shield 10 to extend and/or shorten.
Preferably, the image capturing apparatus further includes: the side light source 12, the side light source 12 is arranged on the inner wall of one end of the retractable light shield 10, the controller is electrically connected with the side light source 12, and the controller is used for controlling the opening and closing of the side light source 12.
Specifically, the image capturing apparatus further includes: the photoelectric signal induction converter is electrically connected with the controller, and the controller controls the focal length of the camera according to the signal of the photoelectric signal induction converter.
The second multiband light source 9 is a 7x7cm annular light source, and is sleeved with the camera 8 at the middle part thereof, the bottom of the camera 8 is on the same plane with the second multiband light source 9, the first multiband light source is ultraviolet light at the segment of 245-.
The side light source 12 is a line light source in four directions, and because the photographing distance is short, the side light effect can be realized by the irradiation of the peripheral line light source.
Preferably, the camera 8 is a zoom camera.
Preferably, the first side and the second side are adjacent.
Preferably, the translucent plate 3 is made of ground glass.
The working principle is as follows:
1. light-transmitting shooting in bright field
The first multiband light source firstly uses white light and then uses special light (ultraviolet light or blue light) to carry out light transmission inspection, bright-field light transmission shooting of white light and special light transmission inspection is realized through the camera, and light transmission shooting of single page or document material evidence with few pages can be carried out. The function can realize the detail capture of the fingerprint line pattern of the material detection and the microscopic photographing of the fingerprint line details under the condition of fuzzy and dense stamping.
2. Directional reflection photography
The method mainly comprises the following steps: vertical microscopic photographing, vertical side light microscopic photographing and fluorescence photographing.
2.1 vertical photomicrograph
Under the closed state of the first multiband light source, the type, the incident light direction and the camera of the second multiband light source are controlled by the controller, so that the vertical orientation general view and the microscopic enlarged photographing of a specific part are realized. This function can realize to examine material fingerprint pattern detail and catch.
2.2 vertical side light photomicrograph
Under the state that the first multiband light source is closed, the controller controls the type, incident light direction and camera of the second multiband light source, so that the characteristic capture of the printing or non-printing pigment of the fingerprint pattern of the material to be detected can be realized, the white light emitted by the side light source is adjusted to realize side light photographing under the incident light condition in four directions, namely front, back, left and right, and the micro recording of the fingerprint line pigment composition can be realized. Because the photographing distance is short, the side light source irradiation can realize the side light effect.
2.3 fluorescent photography
Under the closed state of the first multiband light source, the type of the second multiband light source, the focal length of the camera and the telescopic light shield are adjusted to extend, so that the photographing environment is in a dark field environment, and the fluorescent image recording can be performed on the finger print line pigment composition. The function can realize the fluorescent image capture of the fingerprint pattern which is fuzzy, potential and difficult to distinguish by naked eyes on the material to be detected.
The position of the image acquisition device can be adjusted by the moving mechanism in the shooting process, and the distance between the image acquisition device and the light outlet can be changed by the first adjusting screw rod, so that the height adjustment is completed; the relative position of the image acquisition device and the light outlet can be changed through the second adjusting screw rod, namely, the left and right adjustment is completed; the slide of the slide block on the slide rail drives the support rod to move, and the front and back adjustment is completed.
The acquired images comprise microscopic images, fluorescence images and the like, and valuable fingerprint line information is acquired. Microscopic images, which can analyze the basic composition of the coloring material of the fingerprint (judging the formation mode: the microscopic form of the fingerprint is different under the conditions of normal stamping, printing, copying, transfer printing, etc.); the fluorescent image can enhance the visual contrast between the fingerprint line and the carrier under the two states of heavy and light finger printing pigment, and effectively extract a plurality of detailed characteristics.
The image acquisition device in the embodiment of the invention can realize the effects of bright and dark visual field environments, light transmission and side light photographing, and through the capture and exchange of the multiplying power of the camera, the capture efficiency of the visible fingerprint surface information of the file is increased, the image acquisition efficiency is improved, and the image is more vivid and the information is more comprehensive.
According to the embodiment of the invention, the moving mechanism can realize the left-right, up-down and front-back adjustment of the image acquisition device, can realize the continuous photographing of different parts to be inspected of the fixed manuscript at one time, and improves the extraction efficiency of the document evidence.
The image acquisition device in the embodiment of the invention can realize the fluorescent photographing of the visible fingerprint of the fixed manuscript to the part needing to be inspected under the working mode of the telescopic light shield and the light condition of the second multiband light source in the required waveband, and record the streak information which is not well distinguished by naked eyes.
According to the portable fingerprint extraction equipment provided by the embodiment of the invention, the position of the image acquisition device is adjusted through the moving mechanism, the image acquisition device can be used for acquiring the image of the material on the first side surface, the extraction efficiency of the original of the identification material is improved, and further, a document and physical evidence judicial appraiser can acquire the macro and detail related information of the original of the document as comprehensively as possible on the basis of not mastering the original material, so that the case handling efficiency is obviously improved, and the case receiving range of the visible fingerprint judicial appraisal on the document is expanded.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A portable fingerprint extraction device characterized in that the fingerprint extraction device comprises: the device comprises a rectangular case (1), a controller, a first multiband light source, a moving mechanism and an image acquisition device, wherein the first multiband light source, the moving mechanism and the image acquisition device are electrically connected with the controller respectively;
a light outlet (2) is formed in a first side face of the rectangular case (1), a semitransparent plate (3) is arranged at the light outlet (2), the first multiband light source is arranged in the rectangular case (1), and light generated by the first multiband light source is emitted through the semitransparent plate (3);
a moving mechanism is arranged on the second side face of the rectangular case (1), and is used for adjusting the position of the image acquisition device;
the image acquisition device is arranged opposite to the first side surface and used for acquiring images of the material on the first side surface, the image acquisition device transmits acquired image information to the controller, and the controller extracts fingerprints according to the received image information.
2. The portable fingerprint extraction device of claim 1, wherein the movement mechanism comprises: the device comprises a support rod (4), a first adjusting screw rod (5) with a telescopic function, a second adjusting screw rod (6) with a telescopic function and a servo motor, wherein a slide rail (7) parallel to the plane where the first side surface is located is arranged on the second side surface, one end of the support rod (4) slides on the slide rail (7) through a slide block, a controller is electrically connected with the servo motor, and the controller controls the slide of the slide block through the servo motor;
the other end of the supporting rod (4) is connected with one end of the first adjusting screw rod (5) at a first angle, the other end of the first adjusting screw rod (5) is connected with one end of the second adjusting screw rod (6) at a second angle, and the other end of the second adjusting screw rod (6) is connected with the image acquisition device;
the controller is respectively electrically connected with the first adjusting screw (5) and the second adjusting screw (6), and the controller is used for controlling the expansion amount of the first adjusting screw (5) and/or the second adjusting screw (6).
3. The portable fingerprint extraction device of claim 2, wherein the first angle and the second angle are both 90 degrees.
4. The portable fingerprint extraction apparatus of claim 1, wherein the image capture device comprises: a second multiband light source (9) and a camera (8), wherein the second multiband light source (9) is an annular light source, and the camera (8) is arranged in the annular light source; the second multiband light source (9) is used for generating different color light, the controller is electrically connected with the second multiband light source (9), the controller is used for controlling the second multiband light source (9) to generate light sources with different wavebands, the controller is electrically connected with the camera (8), and the controller is used for controlling the focal length of the camera (8).
5. The portable fingerprint extraction device of claim 4, wherein the image capture device further comprises: the second multiband light source (9) is arranged at one end of the telescopic light shield (10), the other end of the telescopic light shield (10) is opposite to the first side face, the telescopic light shield (10) is electrically connected with the controller, and the controller is used for controlling the telescopic light shield (10) to extend and/or shorten.
6. The portable fingerprint extraction device of claim 5, wherein the image capture device further comprises: the side light source is arranged on the inner wall of one end of the telescopic light shield (10), the controller is electrically connected with the side light source, and the controller is used for controlling the opening and closing of the side light source.
7. Portable fingerprint extraction device according to claim 4, characterized in that the camera (8) is a variable focus camera.
8. The portable fingerprint extraction device of claim 1, wherein the first side and the second side are adjacent.
9. A portable fingerprint extraction apparatus according to claim 1, wherein said translucent plate (3) is made of ground glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911021309.8A CN110646442A (en) | 2019-10-25 | 2019-10-25 | Portable fingerprint extraction equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911021309.8A CN110646442A (en) | 2019-10-25 | 2019-10-25 | Portable fingerprint extraction equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110646442A true CN110646442A (en) | 2020-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911021309.8A Pending CN110646442A (en) | 2019-10-25 | 2019-10-25 | Portable fingerprint extraction equipment |
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| Country | Link |
|---|---|
| CN (1) | CN110646442A (en) |
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2019
- 2019-10-25 CN CN201911021309.8A patent/CN110646442A/en active Pending
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