Fingerprint photographing device, fingerprint photographing method, and specimen testing method

Abstract

To decrease a reduction amount of DNA remaining on a test body front surface when performing finger / palm print photographing with the use of an ultraviolet ray.SOLUTION: A finger / palm print photographing device includes: an ultraviolet ray source 1; a photographing machine 4 having sensitivity with respect to a wavelength of the ultraviolet ray; and an optical system for allowing reflection light of the ultraviolet ray emitted from the ultraviolet ray source 1 and reflected against a test body to be made incident to the photographing machine 4. The wavelength of the ultraviolet ray is the wavelength for occurrence of light absorption in protein, so that a finger / palm print on the test body is photographed by using a difference of a reflectance of the ultraviolet ray. A finger / palm print normally is present on a test body front surface 2 together with cytoplasm containing protein and a cell nucleus including DNA is encapsulated by the cytoplasm. The ultraviolet ray emitted toward the test body front surface 2 is absorbed in the cytoplasm, i.e., protein, so as to reduce the amount of the ultraviolet ray to reach DNA included in the cell nucleus. Thus, the amount of DNA to be reduced by the ultraviolet ray is decreased, so that the finger / palm photographing by the ultraviolet ray can be performed while decreasing the reduction amount of DNA.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a finger / palm print photographing device. 、 Finger and palm print photography method and the method of testing the specimen Regarding. [Background technology]

[0002] Conventional fingerprint detection technologies include the solid method, in which fine powder such as aluminum is physically adsorbed onto fingerprint components and detection is performed using the difference in color tone between the object and the powder, and the gas method, in which a chemical agent is reacted with amino acids, inorganic ions, etc. contained in fingerprint components to cause coloration and detection.Furthermore, as a non-destructive and non-contact method for detecting latent fingerprints, etc., there is a fingerprint photography method, as shown in Non-Patent Document 1, in which ultraviolet light is irradiated and a latent fingerprint is photographed using the difference in light reflectance on the surface of the specimen. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Lee, H., C. and Gaensslen, R., E.: Advances in fingerprint technology 2nd edition. CRC Press, Bocca Ranton, Florida (2001), pp.150-153. [Non-patent document 2] Koji Fujii and six others, "Impact on STR typing tests used for fingerprint detection, etc.", Journal of the Japanese Society of Forensic Science and Technology, Japanese Society of Forensic Science and Technology, 2008, Vol. 13, No. 2, pp. 143-148 [Non-patent document 3] Manuel Buonanno et al., 207-nm UV Light—A Promising Tool for Safe Low-Cost Reduction of Surgical Site Infections. I: In Vitro Studies, PLOS ONE, October 2013, Vol. 8, No. 10 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while fingerprint photography methods using ultraviolet light enable fingerprint photography, they are known to decompose DNA remaining on the surface of the specimen, adversely affecting STR (Short Tandem Repeat) type testing performed after fingerprint photography (see, for example, Non-Patent Document 2). The present invention has been made in view of the above circumstances, and provides a finger / palm print photographing device that can reduce the amount of DNA remaining on the surface of a specimen. 、 Finger and palm print photography method and the method of testing the specimen The purpose is to provide. [Means for solving the problem]

[0005] According to the finger / palm print photographing device of the present invention, the wavelength of the main light output is 222nm a light source that emits ultraviolet light, a camera that is sensitive to the wavelength of ultraviolet light, and an optical system that causes the ultraviolet light that is emitted from the light source and reflected by a specimen having proteins attached thereto to be incident on the camera, and the fingerprint / palm print photographing device photographs the fingerprint on the surface of the specimen by utilizing the difference in reflectance of ultraviolet light. 。 Ma In addition, according to a finger / palm print photographing method according to another embodiment of the present invention, the wavelength of the main light output is 222nm The method for photographing finger and palm prints on the surface of a specimen is provided by irradiating the specimen with ultraviolet light having a mirror surface, allowing the ultraviolet light reflected by the specimen to enter a photographing device, and utilizing the difference in reflectance of ultraviolet light to suppress DNA degradation caused by ultraviolet light. 。 Ma In addition, according to another embodiment of the present invention, there is provided a method for inspecting a specimen, which includes a step of photographing a finger / palm print on a surface of a specimen having a mirror-like surface, and a step of inspecting the specimen after the step of photographing the finger / palm print, wherein in the step of photographing the finger / palm print, the wavelength of the main optical output is 222nmThe method for inspecting a specimen includes irradiating the specimen with ultraviolet light, causing the ultraviolet light reflected by the specimen to enter a photographing device, and photographing the finger / palm print on the surface of the specimen by utilizing the difference in reflectance of the ultraviolet light. [Effects of the Invention]

[0006] According to one aspect of the present invention, when photographing a finger / palm print using ultraviolet light, it is possible to reduce the degradation of DNA remaining on the surface of a specimen. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram illustrating an example of a finger / palm print photographing device according to an embodiment of the present invention. [Figure 2] 1 is an example of a fingerprint image. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0009] In the following detailed description, many specific configurations are described to provide a thorough understanding of the embodiments of the present invention. However, it is clear that other embodiments can be implemented without being limited to such specific configurations. Furthermore, the following embodiments do not limit the invention according to the claims. Furthermore, not all combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0010] A finger / palm print photographing device according to one embodiment of the present invention comprises a light source that emits ultraviolet light, a photographing device that is sensitive to ultraviolet wavelengths, and an optical system that causes the ultraviolet light emitted from the light source and reflected by a specimen to enter the photographing device, the ultraviolet wavelength being within a wavelength band in which light absorption occurs in proteins, and photographing finger / palm prints on the specimen by utilizing differences in the reflectance of ultraviolet light.

[0011] In other words, DNA attached to the surface of a specimen is usually not attached by itself, but is thought to be attached in large part together with proteins and lipids derived from the human body. Specifically, the fingerprints and palm prints present on the surface of a specimen contain cells derived from the human body, and these cells have cell nuclei surrounded by cytoplasm, with DNA contained within the cell nuclei. In other words, the DNA in the cell nuclei is surrounded by cytoplasm containing proteins, and it is thought that the DNA is attached to the surface of the specimen in this state.

[0012] The finger / palm print photographing device according to one embodiment of the present invention takes advantage of the fact that proteins have the property of absorbing ultraviolet light, and by irradiating ultraviolet light at a wavelength that causes light absorption by proteins, the ultraviolet light is absorbed by the proteins, thereby photographing finger / palm prints while suppressing DNA degradation caused by ultraviolet light.

[0013] 1, a finger / palm print photographing device 10 according to this embodiment comprises an ultraviolet light source 1, a photographing machine 4, an image memory device 5, an output device 6, and a display device 7, and photographs a latent fingerprint 3 present on the surface of a specimen having a specular surface (hereinafter referred to as the specimen surface). The image memory device 5, output device 6, and display device 7 may be configured, for example, as a single personal computer equipped with a storage device, a display device, and an output device. Although the case where a latent fingerprint 3 is photographed will be described here, the same effect can be obtained when photographing a latent palm print or an apparent finger / palm print.

[0014] The ultraviolet light source 1 can be any type of ultraviolet light generation source, as long as it emits ultraviolet light of a wavelength that is absorbed by proteins as its primary light and does not emit ultraviolet light of a wavelength that is not absorbed by proteins as its primary light. For example, the ultraviolet light source 1 may be provided with a bandpass filter, shortpass filter, or the like on the output side of the light source, and emit ultraviolet light of a wavelength that is absorbed by proteins as its primary light from the filter. Alternatively, a light source may be provided without a filter, and emit ultraviolet light of a wavelength that is absorbed by proteins as its primary light. In either case, the light source may be a light source that does not emit ultraviolet light of a wavelength that is not absorbed by proteins as its primary light. The ultraviolet light of a wavelength that is absorbed by proteins is a wavelength between 200 nm and 230 nm. The filter provided on the output side of the light source preferably blocks the passage of ultraviolet light of wavelengths longer than 250 nm.

[0015] The ultraviolet light source 1 only needs to be able to emit ultraviolet light of an intensity sufficient to photograph the latent fingerprint 3 on the specimen surface 2. It also only needs to be able to irradiate ultraviolet light for a period of time equivalent to the time required to photograph the latent fingerprint 3 on the specimen surface 2. As shown in Non-Patent Document 3, proteins derived from the human body are known to exhibit significant light absorption in the wavelength range of 200 nm or more and 230 nm or less, but exhibit little light absorption in the wavelength range of 250 nm or more and 300 nm or less.

[0016] For this reason, when a latent fingerprint containing human proteins and lipids is irradiated with ultraviolet light emitted by a light source, such as a low-pressure mercury light source, which generally emits light in the UV-C range (200 nm to 300 nm), or a high-pressure mercury light source whose primary output wavelength is in the 250 nm to 300 nm range, the ultraviolet light may pass through the protein without being absorbed by the protein. In other words, the ultraviolet light reaches the cell nucleus, which is surrounded by the cytoplasm, without being absorbed by the protein-containing cytoplasm. The ultraviolet light reaches the DNA in the cell nucleus, resulting in DNA scission. On the other hand, when a latent fingerprint is irradiated with ultraviolet light emitted by a light source whose primary output wavelength is in the 200 nm to 230 nm range, the protein absorbs light in this wavelength range, reducing the amount of light in the 200 nm to 230 nm range that reaches the protein-encased DNA. As a result, the amount of DNA scission is reduced, making it possible to reduce the loss of normal DNA.

[0017] The imager 4 may be any imager that is sensitive to the wavelength of the ultraviolet light emitted by the ultraviolet light source 1, and preferably has higher sensitivity to the ultraviolet light emitted by the ultraviolet light source 1 than to other wavelength bands excluding this wavelength. For example, a CMOS sensor or the like can be used as the imager 4. Similar effects can be achieved by using an image intensifier to convert ultraviolet light into visible light and then photographing using a CCD camera or the like as the imager 4. The imager 4 emits ultraviolet light of the same wavelength as the ultraviolet light irradiated onto the specimen surface 2. For this purpose, for example, the entrance side of the imager 4 is provided with a filter that passes only ultraviolet light of the same wavelength as the ultraviolet light irradiated onto the specimen surface 2, or the imager 4 is provided with a filter processing unit that performs the same function as this filter.

[0018] The fingerprint image captured by the camera 4 is stored in the image memory device 5 and displayed on the monitor of the display device 7. In addition, the fingerprint image is output as electronic data or printed matter using the output device 6 via an SD card, a compact disc, a printer, etc. The ultraviolet light source 1 and the imager 4 are arranged in a position where, of the reflected light of ultraviolet light emitted from the ultraviolet light source 1 and reflected by the specimen surface 2, the diffuse reflection component (diffuse reflected light) is incident on the imager 4, and the specular reflection component (specular reflected light) is unlikely to be incident on the imager 4. Although not shown, lenses and the like included in the imager 4 correspond to the optical system. In the finger / palm print photographing device 10 having such a configuration, when photographing a latent fingerprint 3, ultraviolet light is irradiated onto the specimen surface 2 from the ultraviolet light source 1, and the light reflected by the specimen surface 2 is incident on the photographing device 4.

[0019] Since the specimen surface 2 is a specular surface, if there is no adhesion of a latent fingerprint 3 or the like on the specimen surface 2, the ultraviolet light emitted from the ultraviolet light source 1 is specularly reflected by the specimen surface 2. As a result, the reflected light contains less diffuse reflection components and more specular reflection components, and since only a small amount of the diffuse reflection component enters the imager 4, the obtained image is almost entirely dark.

[0020] On the other hand, if a latent fingerprint 3 is present on the specimen surface 2, diffuse reflection occurs when the ultraviolet light emitted from the ultraviolet light source 1 is irradiated onto the latent fingerprint 3, resulting in a small specular reflection component and a large diffuse reflection component in the light reflected from the latent fingerprint 3. Also, the reflected light of ultraviolet light irradiated onto the specimen surface 2 itself, without any attached matter, has a large specular reflection component and a small diffuse reflection component because the specimen surface 2 is a mirror surface. Therefore, as shown in Figure 2, the image of the latent fingerprint 3 is captured as a relatively bright image of the ridges and a relatively dark image of the other areas, and the areas where the latent fingerprint 3 does not exist are captured as dark images, making it possible to capture the latent fingerprint 3 attached to the specimen surface 2. In other words, the reflectance of ultraviolet light differs between the mirror surface of the specimen surface 2 and the areas where the latent fingerprint 3 exists, making it possible to capture the latent fingerprint 3. Note that Figure 2 is an example of a fingerprint image when a light source with a main light output of ultraviolet light with a wavelength of 222 nm is used as the ultraviolet light source 1.

[0021] At this time, ultraviolet light is irradiated toward the specimen surface 2, thereby irradiating the latent fingerprint 3 with ultraviolet light. The wavelength of the ultraviolet light irradiated toward the specimen surface 2 is 222 nm, which is within the wavelength range of 200 nm to 230 nm, where light absorption by proteins occurs primarily. Therefore, even if ultraviolet light is irradiated toward the latent fingerprint 3, the cytoplasm, which is made up of proteins and the like that are normally present with the latent fingerprint 3, absorbs the ultraviolet light, and therefore the amount of ultraviolet light irradiated from the ultraviolet light source 1 that reaches the DNA contained in the cell nucleus surrounded by the cytoplasm (protein) is reduced. Therefore, it is possible to prevent the ultraviolet light irradiated from the ultraviolet light source 1 to photograph the latent fingerprint 3 from causing DNA chain breaks or the like in the DNA in the latent fingerprint 3, and thus prevent a decrease in normal DNA.

[0022] In this way, the amount of DNA loss due to ultraviolet irradiation can be reduced, and thus latent fingerprints 3 can be photographed without reducing the amount of DNA loss. Therefore, with conventional fingerprint photographing methods using ultraviolet light, the amount of DNA remaining on the specimen surface 2 in the specimen after fingerprint image capture is large, making STR typing difficult, but by using an ultraviolet light source 1 that mainly outputs light at wavelengths at which protein light absorption occurs, DNA decomposition can be reduced, making it possible to photograph fingerprints and perform STR typing at the same time. Similarly, even when photographing latent palm prints or manifest finger prints, it is possible to photograph palm prints or manifest finger prints and perform STR typing at the same time, just like with latent fingerprints 3.

[0023] In the above embodiment, as shown in Fig. 1, a case has been described in which the diffuse reflection component of the light reflected from the specimen surface 2 is photographed by the imager 4, but the present invention is not limited to this. As shown by the dashed line in Fig. 1, the imager 4 may be positioned so that the specular reflection component of the light reflected from the specimen surface 2 of the ultraviolet light emitted by the ultraviolet light source 1 is incident on the imager 4 and the diffuse reflection component is less likely to be incident on the imager 4, and the imager 4 may photograph the specular reflection component of the light reflected from the specimen surface 2. In this case, the image of the specimen surface 2 will be photographed as a relatively bright image, the ridge portions of the latent fingerprint 3 will be photographed as a relatively dark image, and the portion excluding the ridge portions will be photographed as a relatively bright image, and the latent fingerprint 3 can be photographed as an image with light and dark contrast reversed from that in Fig. 2.

[0024] In addition, in the above embodiment, the case where the reflected light from the specimen surface 2 is directly incident on the imager 4 is described, but this is not limited to this. For example, an optical system may be provided that combines a lens and a reflecting mirror to cause the reflected light from the specimen surface 2 to be incident on the imager 4. The scope of the present invention is not limited to the exemplary embodiments shown and described, but includes all embodiments that achieve equivalent effects to those intended by the present invention. Furthermore, the scope of the present invention can be defined by any desired combination of specific features among all the respective features disclosed. [Explanation of symbols]

[0025] 1 UV light source 2. Specimen surface 3 Latent fingerprint 4. Camera 5 Image memory device 6 Output Devices 7 Display device 10 Finger and palm print imaging device

Claims

1. a light source that emits ultraviolet light having a primary light output wavelength of 222 nm; a camera sensitive to the ultraviolet wavelength; an optical system that causes the ultraviolet light emitted from the light source and reflected by a sample having proteins attached thereto to be incident on the image capture device, A finger / palm print photographing device that takes an image of the finger / palm print on the surface of the subject by utilizing the difference in reflectance of ultraviolet light.

2. 2. The finger / palm print photographing device according to claim 1, wherein the specimen is a specimen prior to STR type testing.

3. 3. The finger / palm print photographing device according to claim 1, wherein the photographing device is disposed at a position where the diffusely reflected ultraviolet light is incident on the specimen.

4. 3. The finger / palm print photographing device according to claim 1, wherein the photographing device is disposed at a position where the specularly reflected light of the ultraviolet light is incident on the specimen.

5. A method for photographing finger and palm prints, comprising: irradiating a specimen having a mirror-like surface with ultraviolet light having a main optical output wavelength of 222 nm; allowing the ultraviolet light reflected by the specimen to enter a photographing device; and photographing finger and palm prints on the surface of the specimen while suppressing DNA degradation caused by the ultraviolet light by utilizing the difference in reflectance of the ultraviolet light.

6. 6. A method for photographing a finger / palm print according to claim 5, wherein the irradiation of the ultraviolet light is stopped after the time required for photographing the finger / palm print has been completed.

7. A method for testing a specimen, the method comprising: a step of photographing a finger / palm print on a surface of a specimen having a mirror-fingered surface; and a step of testing the specimen after the step of photographing the finger / palm print, In the step of photographing the finger / palm prints, the specimen is irradiated with ultraviolet light having a main optical output wavelength of 222 nm, the ultraviolet light reflected by the specimen is incident on an imager, and the finger / palm prints on the surface of the specimen are photographed by utilizing the difference in reflectance of the ultraviolet light.

8. 8. The method for testing a specimen according to claim 7, wherein the step of testing is a step of testing DNA contained in the finger / palm print on the surface of the specimen by an STR type testing method.

9. 9. The method for testing a specimen according to claim 7, wherein the irradiation of the ultraviolet light is stopped after the irradiation of the fingerprint and palm print has been completed for a period of time required for photographing the fingerprint and palm print.

10. 10. The method for inspecting a specimen according to claim 7, wherein the imager is disposed at a position where a diffuse reflection component of the ultraviolet light can be incident on the specimen.

11. 10. The method for inspecting a specimen according to claim 7, wherein the imager is disposed at a position where a specular reflection component of the ultraviolet light on the specimen can be incident.

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