CN110763645A - Criminal investigation is with wide spectrum device of collecting evidence - Google Patents

Abstract

The application discloses a wide-spectrum evidence collection device for criminal investigation, comprising a host, a light source, an achromatic lens and a filter wheel; the light source is arranged on the light entrance end of the achromatic lens, and the light exit end of the achromatic lens Connected to the host through the filter wheel, the light source includes a plurality of first luminous bodies with different wavelengths, and at least one of the first luminous bodies has a wavelength in the ultraviolet band, and the first luminous bodies with different wavelengths are controlled independently of each other In the above manner, the forensic device of the present application is easy to carry, which is beneficial to simplify the forensic process and improve the survey efficiency.

Description

A wide spectrum forensics device for criminal investigation

technical field

The present application relates to the technical field of public security criminal investigation, in particular to a broad spectrum evidence collection device for criminal investigation.

Background technique

In the process of crime scene investigation, in order to find more biological inspection materials, potential fingerprints, tool traces and other traces, and to obtain more investigative clues and criminal evidence, investigators need to use a variety of technical means to conduct a detailed investigation of the crime scene . The optical visualization technology can largely not cause damage to the traces left at the crime scene and various inspection materials, so it is widely used in the investigation of crime scenes.

The so-called optical display technology is a display method that uses the properties and laws of light, and comprehensively uses lighting tools and photographic equipment to display and record visible images for some traces and various physical evidences that cannot be seen or even invisible to the eyes. Ultraviolet visualization, infrared visualization, biological inspection material visualization and other technical means. Therefore, this technology requires surveyors to carry a variety of survey equipment such as infrared cameras, ultraviolet cameras, ultraviolet light sources, and multi-band light sources in addition to SLR cameras and video recorders for on-site photography and video recording. Frequent switching between devices will obviously lead to problems such as poor portability of the device, cumbersome forensics process, and low survey efficiency.

SUMMARY OF THE INVENTION

The main technical problem to be solved by the present application is to provide a wide-spectrum evidence collection device for criminal investigation, which is easy to carry, facilitates the simplification of the evidence collection process, and improves the exploration efficiency.

The embodiments of the present application provide a wide-spectrum forensic device for criminal investigation, including a host, a light source, an achromatic lens, and a filter wheel equipped with an optical filter;

The light source is arranged on the light entrance end of the achromatic lens, the light exit end of the achromatic lens is connected to the host through the filter wheel, and the light source includes a plurality of first illuminants with different wavelengths, and the wavelength of at least one first luminous body is located in the ultraviolet band, and the first luminous bodies of different wavelengths are controlled independently of each other;

The host includes an image sensor, a display screen and a matching module, the display screen and the matching module are respectively connected to the image sensor, the image sensor receives the light signal emitted from the achromatic lens, and converts the light signal to the Converted into an electrical signal to generate a collected image, the matching module is used to match the fingerprint information in the collected image with the fingerprint information in the public security database after identifying and acquiring the fingerprint information in the collected image, and output match results.

Wherein, the plurality of first luminous bodies with different wavelengths include a plurality of first luminous bodies with different emitting angles;

The first illuminators with the same wavelength and different illuminating angles are controlled by the programmable controller or different switches, and the first illuminants with the same wavelength and the same illuminating angle are controlled by the programmable controller or the same switch.

Wherein, the light source further includes a ring-shaped lampshade and a second illuminator, the first illuminator is an LED lamp and/or a laser, and the second illuminator is a mercury lamp with a light wavelength of 254 nanometers;

The second light-emitting body is arranged in the lampshade, and the first light-emitting body is annularly distributed around the second light-emitting body.

Wherein, at least a part of the optical axis of the first illuminant and the optical axis of the achromatic lens are arranged non-parallel.

Wherein, the included angle between the optical axis of at least part of the first light-emitting body and the optical axis of the achromatic lens is 10°˜30°.

Wherein, the filter wheel includes a multi-layer structure, and the optical filter includes any one or more of the following combinations: a combination of a long-wave filter and a narrow-band filter, a short-wave filter and a narrow-band filter Combination, longpass filter and notch filter combination.

Wherein, it also includes a laser for focusing, the laser is arranged on the light source, the achromatic lens or the filter wheel, and is used for emitting a preset light spot pattern.

Wherein, the host also includes a scale calculation module, the laser is a laser that emits a grid spot pattern laser, and the scale calculation module calculates the scale of the collected image according to the following formula:

Wherein, the x represents the scale of the captured image, the Q represents the grid spacing in the grid spot pattern, the p represents the pixel size of the image sensor, the m represents the number of grids, and the n Indicates the image elements occupied by m grids on the image surface of the image sensor.

The host also includes a laser ranging module and a scale calculation module, the laser ranging module cooperates with the laser to calculate the distance from the achromatic lens to the object surface, and the scale calculation module calculates the distance according to the object distance. , the preset relationship between the distance and the scale of the acquired image, and the image square intercept to calculate the scale of the acquired image.

Wherein, the laser light emitted by the laser is a one-line light spot pattern or a cross light spot pattern, and the laser is a green laser or a red laser.

The wide-spectrum forensics device for criminal investigation of the present application includes a host, a light source, an achromatic lens and a filter wheel. The light source is arranged on the light entrance end of the achromatic lens. There is an image sensor in the device, so that on-site photos can be collected through an achromatic lens, wherein the light source includes a variety of first illuminants with different wavelengths, and the first illuminators with different wavelengths are independently controlled. The camera function and the lighting function are integrated into one, and light sources of different wavelengths can be selected according to the needs, which can greatly reduce the types of equipment to be carried in the forensics process, and is easy to carry and switch the light source, which is conducive to simplifying the forensics process and improving the survey efficiency. By setting a matching module in the host, after identifying and obtaining the fingerprint information in the collected image, the fingerprint information in the collected image is matched with the fingerprint information in the public security database, and the matching result is output, so as to realize on-site identification of suspects people to further improve the exploration efficiency.

Description of drawings

Fig. 1 is a structural representation of the wide-spectrum evidence collection device for criminal investigation provided by the application;

2 is a schematic structural diagram of a light source in the wide-spectrum evidence collection device for criminal investigation provided by the present application;

3 is a schematic diagram of the non-parallel arrangement of the optical axes of the first illuminant and the achromatic lens in the wide-spectrum evidence collection device for criminal investigation provided by the present application;

4 is a schematic diagram of the light spot and light intensity waveform in the central area when the angle between the optical axis of the first illuminant provided by the present application and the optical axis of the achromatic lens is 0°;

5 is a schematic diagram of the light spot and light intensity waveform in the central area when the included angle between the optical axis of the first illuminant provided by the application and the optical axis of the achromatic lens is 30°;

6 is a schematic structural diagram of a host computer provided by the present application;

Fig. 7 is another structural representation of the broad spectrum forensics device for criminal investigation provided by the application;

Fig. 8 is another structural schematic diagram of the host provided by the present application;

9 is another structural schematic diagram of the host provided by the present application;

FIG. 10 is a schematic diagram of the imaging principle of the achromatic lens of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of this application.

The wide-spectrum evidence-gathering device for criminal investigation in the embodiment of the present application is a camera device, which may be suitable for displaying and photographing evidence at a criminal investigation scene.

Referring to FIG. 1 , the broad spectrum forensics device for criminal investigation according to the embodiment of the present application includes a host 10 , a light source 20 , an achromatic lens 30 and a filter wheel 40 equipped with an optical filter. The host 10 captures a picture through the achromatic lens 30 to realize the photographing function.

The achromatic lens 30 may be a wide-spectrum achromatic fixed focus or zoom lens, and its working wavelength range is 180 nm (nanometer) to 1100 nm.

Wherein, the light source 20 is arranged on the light incident end of the achromatic lens 30 , and specifically can be arranged around the light incident end of the achromatic lens 30 . For example, the achromatic lens 30 can be arranged in a lens barrel, the lens barrel can be a circular barrel, the light source 20 has a corresponding circular shape, and the light source 20 is sleeved on the lens barrel and located around the achromatic lens 30 . Wherein, the light source 20 may be a ring light source, the middle area of which is hollowed out, and the hollowed-out middle area corresponds to the achromatic lens 30 in position, so that external light can enter the achromatic lens 30 from the middle area. Alternatively, a transparent member, such as a transparent plastic layer or a transparent glass layer, can also be provided in the middle area of the light source 20 , so as to protect the achromatic lens 30 .

In this embodiment, as shown in FIG. 2 , the light source 20 includes a first illuminant 201 , a second illuminator 202 , a mask 203 and a circuit board 204 with various wavelengths, the first illuminant 201 and the second illuminator 202 Connect to circuit board 204 . The first light-emitting body 201 and the second light-emitting body 202 are disposed in the lampshade 203 , and the first light-emitting body 201 is annularly distributed around the inner circumference of the second light-emitting body 202 .

Wherein, the wavelength of at least one first light-emitting body 201 is located in the ultraviolet band, for example, the wavelength may be 254 nm, so as to perform fingerprint forensics. The first light-emitting body 201 may be an LED lamp, or a laser light source, such as a semiconductor laser, an ultraviolet laser, or a solid-state laser. Taking the first light-emitting body 201 as an LED lamp as an example, the wavelengths of the first light-emitting body 201 may include 254nm, 260nm, 265nm, 270nm, 275nm, 280nm, 285nm, 290nm, 295nm, 300nm, 313nm, 365nm, 410nm, 415nm, 450nm , 515nm, 520nm, 550nm, 590nm, 650nm, 690nm, 750nm, 800nm, 850nm, 900nm, 940nm, 950nm, etc., that is to say, the light source 20 includes the first luminous body 201 of the various wavelengths listed above. Of course, the wavelength type of the first light-emitting body 201 can be selected according to actual needs, which is not limited. In addition, the first light-emitting body 201 may further include red LEDs, blue LEDs, green LEDs, and white LEDs.

The number of the first light-emitting bodies 201 of each wavelength may be one, two or more, and the number of the first light-emitting bodies 201 of different wavelengths may be the same or different. For example, in the light source 20, there may be two first light-emitting bodies 201 with a wavelength of 254 nm, and there may be four first light-emitting bodies 201 with a wavelength of 270 nm.

The first light-emitting bodies 201 with different wavelengths are controlled by different switches. Therefore, in the process of use, the first light-emitting body 201 with different wavelengths can be selected to be used for irradiation, and it is only necessary to press different switches, and there is no need to switch between different devices, which is convenient for operation.

Wherein, the first light-emitting body 201 of the same wavelength can also be controlled by different switches. In other words, in the embodiment of the present application, the switches of each first light-emitting body 201 can be independently controlled and independent of each other, so that different switches can be obtained. The lighting effect is more convenient to use, and it can also be flexibly selected and switched according to different sites. Of course, in other embodiments, the first light-emitting body 201 of the same wavelength can also be controlled by the same switch. For example, when the first light-emitting body 201 of the same wavelength has the same switch, the structure can be simplified, and when the first light-emitting body 201 of one wavelength needs to be used When a light-emitting body 201 is used, only one switch can be pressed to control all the first light-emitting bodies 201 of the same wavelength to work, which is convenient for operation.

In other embodiments, the first light-emitting body 201 with different wavelengths can also be flexibly controlled by a programmable controller, that is, the first light-emitting body 201 with different wavelengths can be controlled on or off, or the switching time, etc., can be controlled in a programmable control manner. The programmable controller can be, for example, a single-chip microcomputer. By pre-inputting the program code in the programmable controller, the switches of the first light-emitting bodies of different wavelengths can be independent of each other, or the first light-emitting body can be controlled by the program to emit light, for example Part of the first luminous bodies of the same wavelength are controlled to emit light, or two or more kinds of first luminous bodies are controlled to emit light, and the specifics can be set according to actual needs.

Wherein, two control modes of switch and programmable controller can be set at the same time to realize the on or off control of the first light-emitting body, and the two control modes are triggered by different switches.

In this embodiment, by arranging the light source 20 on the achromatic lens 30, the forensic device of the embodiment of the present application can integrate the photographing function and the lighting function, and the forensic device of this embodiment only needs to be carried when taking evidence. There is no need to carry a variety of equipment, and it has better portability. In addition, the light source 20 includes a plurality of first luminous bodies 201 with different wavelengths, and the first luminous bodies 201 with different wavelengths are controlled by different switches, so that light sources with different wavelengths can be selected through different switches, which can greatly reduce the forensic process. It is convenient to switch the light source, which is beneficial to simplify the forensics process and improve the survey efficiency.

The plurality of first luminous bodies 201 can be evenly arranged, for example, they can be evenly arranged in the circumferential direction as shown in FIG. 2 , and can be arranged in one circle, two circles, or even three circles, etc. number to select. Of course, the plurality of first light-emitting bodies 201 may also be non-uniformly arranged.

The second illuminant 202 may be a mercury lamp, mainly for providing light radiation at 245 nm. Alternatively, the second light-emitting body 202 can also be an LED lamp, that is, the light radiation of 254 nm can be provided by the LED lamp, thereby reducing power consumption and volume.

In addition, the switches of the second light-emitting body 202 and the first light-emitting body 201 are independent of each other, so as to individually control the turning on and off of the first light-emitting body 201 and the second light-emitting body 202 respectively.

Optionally, the first luminous bodies 201 with a variety of different wavelengths may include a plurality of first luminous bodies with different luminous angles, that is, in the first luminous body 201, there may be a plurality of first luminous bodies with different luminous angles, For example, the first light-emitting body 201 with a small light-emitting angle can be used for high beam, while the first light-emitting body 201 with a large light-emitting angle can be used for low beam, so that the selection can be more flexible. Further, in order to facilitate control, the first illuminators 201 with the same wavelength and different illuminating angles can be controlled by a programmable controller or different switches, so that the first illuminants 201 with different illuminating angles can be controlled respectively, which is convenient for flexible selection according to the forensic scene. The first light-emitting bodies 201 with different light-emitting angles work. The first luminous bodies 201 with the same wavelength and the same luminous angle can be controlled by the programmable controller or the same switch, which is beneficial to simplify the structure.

In addition, the first light-emitting body 201 may also include a variety of first light-emitting bodies with different powers, for example, a high-power first light-emitting body can be used for high beam, and a low-power second light-emitting body can be used for low beam .

In the embodiment of the present application, the optical axis of the first light-emitting body 201 and the optical axis of the achromatic lens 30 may be arranged in parallel or non-parallel; The optical axis of the achromatic lens 30 is arranged in parallel, and the optical axis of the other part of the first light-emitting body 201 and the optical axis of the achromatic lens 30 are arranged non-parallel.

For example, as shown in FIG. 3 , in this embodiment, the optical axis a of the first light-emitting body 201 and the optical axis b of the achromatic lens 30 are not parallel, and on the light-emitting side of the first light-emitting body 201 , the first light-emitting body 201 emits light. The optical axis a of the body 201 is inclined toward the optical axis b of the achromatic lens 30, that is, the first illuminant 201 is inclined relative to the optical axis of the achromatic lens 30, thereby avoiding the problem of weak light in the central area when taking close-up photos. It is beneficial to improve the uniformity of illumination. As shown in FIG. 4 and FIG. 5 , the left image of FIG. 4 is a schematic diagram of the light spot in the central area when the angle between the optical axis of the first illuminant 201 and the optical axis of the achromatic lens 30 is 0°, and the right image is The light intensity waveform diagram of the central area. The left picture of FIG. 5 is a schematic diagram of the light spot in the central area when the angle between the optical axis of the first illuminant 201 and the optical axis of the achromatic lens 30 is 30°, and the right picture is the central area. In the light intensity waveform diagram, it can be seen from the comparison of the two figures that as the angle between the optical axis of the first illuminant 201 and the optical axis of the achromatic lens 30 increases, the light intensity in the central area also increases when taking pictures, and the light spot distribution increases. Also more uniform.

Wherein, the included angle between the optical axis of the first light-emitting body 201 and the optical axis of the achromatic lens 30 may be 10° to 30°, for example, may be set to 12° or 15°, or may be other angle ranges, There is no restriction on this.

In this embodiment, the filter wheel 40 includes a multi-layer structure, and the multi-layer structure is a multi-layer optical filter structure, that is, the optical filter loaded in the filter wheel 40 may include any one or a combination of the following : Long-pass filter and narrow-band filter combination, short-pass filter and narrow-band filter combination, long-pass filter and notch filter combination. For example, in the field of physical evidence inspection, four luminescence photography methods are mainly used: ultraviolet fluorescence photography (light source is 200nm ~ 400nm, filter receiving band is 400nm ~ 700nm), visible fluorescence photography method (light source is 400nm ~ 550nm, filter The receiving waveband is 550nm～700nm), the infrared luminescence photography method (the light source is 450nm～600nm, the filter receiving waveband is 700nm～1100nm), the ultraviolet luminescence photographing method (the light source is 200nm～300nm, the filter receiving waveband is 300nm～400nm) ), through the organic combination of the light source and the filter, the four photographing methods can be conveniently realized, which greatly improves the portability and practicability of the forensic device of the embodiment of the present application compared with the conventional equipment.

In this embodiment, the light-emitting end of the achromatic lens 30 is connected to the host 10 through the filter wheel 40, so that the host 10 receives the light emitted from the achromatic lens 30 and converts the light signal into an electrical signal to generate and display an image.

As shown in FIG. 6 , the host 10 includes an image sensor 101 , a display screen 102 and a matching module 103 . The display screen 102 and the matching module 103 are respectively connected to the image sensor 101, and the image sensor 101 receives the optical signal emitted by the achromatic lens 30, and converts the optical signal into an electrical signal to generate a captured image. Display screen 102 displays the captured image. The matching module 103 is used to identify and acquire the fingerprint information in the collected image, match the fingerprint information in the collected image with the fingerprint information in the public security database, and output the matching result, for example, the matching result can be displayed on the display screen 102, For example, the matching result may be displayed on the captured image displayed on the display screen 102, or the display screen 102 may be switched from the current display to displaying the matching result. In other embodiments, the matching module 103 may also send the matching result to other terminals by means of remote communication, for example, to a computer or mobile phone designated by the Ministry of Public Security.

The fingerprint information in the public security database can be the fingerprint information of each suspect recorded by the Ministry of Public Security, so that by automatically matching the fingerprint information of the suspect in the public security database, the suspect can be identified on the spot and the investigation efficiency can be improved.

In one embodiment, the matching module 103 may be configured to automatically perform fingerprint identification and fingerprint information acquisition on each captured image generated by the image sensor 101, so that the fingerprint information to be acquired is related to the public security database for each acquired fingerprint information. The fingerprint information in the match. Alternatively, in some other implementations, a matching button may be set on the host 10, and after the surveyor obtains a captured image through the forensics device of the embodiment of the present application, the matching button may be pressed to trigger the matching module 103 to The currently obtained collected images are used for identification and acquisition of fingerprint information, and then the matching work is performed. Therefore, the matching module 103 does not need to perform fingerprint identification and acquisition for each collected image, which can greatly reduce the amount of computation.

Wherein, when using the forensics device of this embodiment, fingerprint search can be performed through the following steps:

1) Uniform illumination by scattered light to search for various visible fingerprints;

2) Directional reflection lighting, dark field lighting to search for potential fingerprints on smooth objects;

3) Grazing incidence illumination to search for faint dust fingerprints; irradiate the inspection material at nearly 90°;

4) Use ultraviolet fluorescence and visible fluorescence irradiation to search for potential fingerprints on various objects, wherein the ultraviolet fluorescence light source can use the first luminous body with a wavelength of 340 nm, 360 nm or 365 nm; the visible fluorescent light source can use the first luminous body with a wavelength of 450 nm, 480 nm or 550 nm. body;

5) Through ultraviolet reflection, to search for potential fingerprints on objects that strongly absorb ultraviolet rays. The light source for ultraviolet reflection can be 254nm, for example, a second luminous body can be used for irradiation, and the object can be glass, ceramics, enamel, photos, parts of adhesive tape, plastic and paint surfaces and other objects. Among them, the plane object can be irradiated by the first illuminant with an angle of 10°-15° with the optical axis of the achromatic lens, and the cylindrical object can be irradiated by the first illuminator with an angle of 10°-30° with the optical axis of the achromatic lens. The illuminant is incident.

In another embodiment of the present application, the achromatic lens 30 is, for example, a wide-spectrum achromatic zoom lens. Referring to FIG. 7 , the broad spectrum forensics device for criminal investigation may further include a laser 50 . The laser 50 can be arranged on the light source 20 , the achromatic lens 30 or the filter wheel 40 to emit laser light with a preset light spot pattern, for example, the laser 50 can be arranged on the mask of the light source 20 .

For example, the laser light spot pattern emitted by the laser 50 may be a line pattern or a cross pattern, or may also be other light spot patterns such as concentric circles, parallel lines, or grids. Before using the forensics device of the embodiment of the present application to obtain evidence, focusing may be performed first. Specifically, the laser 50 is turned on through the switch of the laser 50, and then the laser 50 can be pointed at a white wall (or other color walls or other objects) to make a preset light spot pattern on the white wall, and then the achromatic lens can be adjusted manually. Then, look at the display screen 102 of the host 10. When a clear preset light spot pattern is seen on the display screen 102, it can be considered that the focusing work is completed. At this time, the laser 50 can be turned off, and then the forensics work can be started.

Wherein, in order to better realize focusing, the laser 50 may be a red laser or a green laser.

In the process of taking a fingerprint, a scale is usually required, and the fingerprint matching of a fingerprint photo needs to be matched with the scale of the photo.

Further, as shown in FIG. 8 , in this embodiment, the host 10 may further include a scale calculation module 104 . The laser 50 is a laser that emits a grid spot pattern laser, and the laser may be a single laser, or a combination of in-line lasers and/or cross lasers to form a grid spot pattern. The scale calculation module 104 calculates the scale of the captured image according to the following formula:

Among them, x represents the scale of the captured image, Q represents the grid spacing in the grid spot pattern, p represents the pixel size of the image sensor, m represents the number of grids, and n represents the area occupied by m grids on the image surface of the image sensor. like elements.

Wherein, when the image sensor 101 and the laser 50 are determined, correspondingly, the pixel size of the image sensor and the grid spacing of the grid spot pattern are also determined, so Q and p can be set in advance, m can be set arbitrarily, for example, Set to 4 grids, 7 grids, or 9 grids, etc. The scale calculation module 104 first calculates the image element n occupied by the m grids on the image surface of the image sensor, then calculates the scale according to the preset Q, p and m, and sends the scale to the matching module 103, thereby The matching module 103 performs fingerprint matching according to the scale. Output to display screen 102 for display with the captured image.

In yet other embodiments, the scale calculation may be implemented through distance calculation. 9 and FIG. 10 , A in FIG. 9 represents the object surface, B represents the image surface, and C represents the achromatic lens. In this embodiment, the host 10 further includes a laser ranging module 105 and a scale calculation module 106 . Using the principle of laser ranging, the laser ranging module 105 cooperates with the laser 50 to calculate the distance Lo from the achromatic lens 30 (ie, C in FIG. 10 ) to the object surface A, and the scale calculation module 106 calculates the distance Lo, distance Lo and The preset relationship between the scales x of the collected images and the image square intercept L' calculates the scales of the collected images.

Specifically, the scale calculation module 106 calculates the scale according to the following formula:

x=y'/y=L'/L

10, x represents the scale, y' represents the image height, y represents the object height, L' represents the image intercept, and L represents the object intercept. The image intercept L' is fixed, and the scale calculation module 106 can calculate the image intercept L' according to the imaging principle; the difference between the distance Lo and the object intercept L is a constant, and there is a predetermined difference between x and the distance Lo. Therefore, according to the above conditions, the constant difference between Lo and the object intercept L can be calculated by using the above formula, so that the object intercept L can be calculated, and then the scale can be obtained according to the above formula.

After the scale is obtained by calculation, the laser 50 is turned off, and after the criminal investigation uses the wide-spectrum forensic device to take a photo, the calculation module 104 adds the obtained scale information to the captured photo.

It should be noted that, in this embodiment, the same laser 50 is used for focusing and calculating the scale. The focusing process and the scale calculation process can be performed simultaneously or sequentially. For example, after focusing, the laser 50 keeps In the ON state, the calculation module 104 starts to calculate the scale. After the calculation of the scale is completed, the laser 50 can be controlled by the calculation module 104 to be automatically turned off, or the calculation module 104 can output the scale to the display screen 102. After the user sees the scale The laser 50 is manually turned off, and then the photographing work is performed.

Wherein, the calculation module 104 can be manually triggered to perform the scale calculation, or the calculation module 104 can also perform the scale calculation after detecting that the laser 50 works or works more than a predetermined time.

The embodiment of the present application can greatly reduce the types of equipment to be carried in the forensics process, and is easy to carry and switch light sources, which is beneficial to simplify the forensics process and improve the survey efficiency; After obtaining the fingerprint information in the collected image, the fingerprint information in the collected image is matched with the fingerprint information in the public security database, and the matching result is output, so that the suspect can be identified on the spot and the investigation efficiency can be further improved.

The above are only the embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields, All are similarly included in the scope of patent protection of the present application.

Claims (10)

1. A wide spectrum evidence obtaining device for criminal investigation is characterized by comprising a host, a light source, an achromatic lens and a filter wheel provided with an optical filter;

the light source is arranged on the light inlet end of the achromatic lens, the light outlet end of the achromatic lens is connected with the host through the filter wheel, the light source comprises a plurality of first illuminants with different wavelengths, the wavelength of at least one first illuminant is positioned in an ultraviolet band, and the first illuminants with different wavelengths are controlled independently;

the host computer includes image sensor, display screen and matching module respectively with image sensor connects, image sensor receives follows the light signal that achromatic lens jetted out, and will light signal conversion is the signal of telecommunication in order to generate the collection image, matching module is used for after discerning and acquireing fingerprint information in the collection image, will fingerprint information in the collection image matches with the fingerprint information in the policeman database, and output matching result.

2. The wide-spectrum forensic device to criminal investigation of claim 1 wherein the plurality of different wavelength first illuminants comprise a plurality of different emission angles;

the first illuminants with the same wavelength and different light-emitting angles are controlled by the programmable controller or different switches, and the first illuminants with the same wavelength and the same light-emitting angles are controlled by the programmable controller or the same switch.

3. The wide-spectrum forensic device to criminal investigation of claim 1 wherein the light source further comprises an annular light cover and a second light emitter, the first light emitter being an LED lamp and/or laser and the second light emitter being a mercury lamp with a wavelength of light of 254 nm;

the second luminous body is arranged in the lampshade, and the first luminous bodies are annularly distributed around the second luminous bodies.

4. The wide-spectrum forensic device according to claim 1 in which at least part of the first light emitter has an optical axis which is non-parallel to the optical axis of the achromatic lens.

5. The wide-spectrum forensic device according to claim 4 in which at least part of the first illuminant has an angle of 10 ° to 30 ° with the optical axis of the achromatic lens.

6. The wide-spectrum forensic device according to claim 1 in which the filter wheel comprises a multilayer structure and the optical filter comprises any one or combination of: long-wave pass filter and narrow-band filter combination, short-wave pass filter and narrow-band filter combination, long-wave pass filter and notch filter combination.

7. The wide-spectrum forensic device according to claim 1 further comprising a laser for focus, the laser being arranged on the light source, achromatic lens or filter wheel to emit a predetermined pattern of spots.

8. The wide-spectrum forensic device according to claim 7 in which the host computer further comprises a scale calculation module, the laser emitting a grid spot pattern laser, the scale calculation module calculating the scale of the captured image according to the following formula:

wherein x represents a scale of an acquired image, Q represents a grid pitch in the grid spot pattern, p represents a pixel size of the image sensor, m represents a grid number, and n represents a pixel element occupied by m grids on an image plane of the image sensor.

9. The wide-spectrum forensic device according to claim 7 in which the host further comprises a laser ranging module cooperating with the laser to calculate the distance of the achromatic lens to the object plane and a scale calculation module calculating the scale of the captured image according to the preset relationship between the object distance, the distance and the scale of the captured image, the image-side intercept.

10. The wide-spectrum forensic device according to claim 7 in which the laser emitted by the laser is a line or cross spot pattern and the laser is a green or red laser.

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