JP7056933B2 - Biological features Voyeur prevention equipment and voyeur prevention method - Google Patents

Description

The present invention relates to a biological feature voyeurism prevention wearing device and a voyeurism prevention method. More specifically, the present invention relates to a biological feature voyeurism prevention device and a voyeurism prevention method that normally reacts to a biological feature sensor and makes it impossible to restore biological features from a photograph taken.

In modern times, fingerprint authentication is widely adopted as a personal authentication method in many places such as auto-locking of apartment houses, in addition to access to confidential information such as entry / exit management and computer login. On the other hand, digital cameras with a resolution of tens of millions of pixels have become widespread, and there is concern that fingerprint information that could only be read by a contact-type fingerprint sensor may be taken remotely and stolen. In 2014, a group of German hackers announced that they had successfully obtained fingerprints by taking a remote shot of a politician's finger using a commercially available digital camera. Once the fingerprint data is in the hands of others, it is possible to get through the fingerprint authentication system by creating a fake fingerprint from it.

As a device for preventing fingerprint voyeurism, a photographing device that outputs a warning sound with a buzzer when the fingerprint information of a registered photographer and the fingerprint information read by the fingerprint sensor do not match is disclosed. (See Patent Document 1)

Japanese Unexamined Patent Publication No. 2005-295391

Since fingerprints are information unique to living organisms, they cannot be changed as often as passwords, and once they are stolen, there is a problem that damage may continue for a long period of time. Further, the photographing apparatus described in Patent Document 1 uses a fingerprint sensor for personal authentication, and is not intended to make it impossible to restore biological characteristics from a photograph taken.

It is an object of the present invention to provide a biological feature voyeurism prevention wearing device and a voyeurism prevention method that normally react to a contact-type biological feature sensor and make it impossible to restore biological features from a photograph taken.

In order to solve the above problems, the biological feature voyeurism prevention wearing device 1 according to the first aspect of the present invention is transparent in the visible light region and covers the biological feature 3 region, for example, as shown in FIG. And a disturbing portion 5 having a light scattering characteristic in the visible light region and covering the biological characteristic 3 region.

Here, the biometric feature is a pattern representing a physical feature peculiar to each living body such as a fingerprint and a palm print, and is used for biometric authentication. Further, the "biological feature region" refers to a region of biometric features from which biometric authentication data is collected. The fingerprint refers to, for example, the area used for imprinting the fingerprint of the thumb or index finger, for example, the palm side from the first joint to the fingertip side. Further, although the base portion and the disturbing portion are typically formed separately, they may be integrally formed as having both functions. Further, the base portion 4 preferably covers the entire biological feature 3 region, and the disturbing portion 5 may cover a part or the entire biological feature 3 region.

When configured as in this embodiment, it is possible to provide a biological feature voyeur prevention wearing device that normally reacts to a contact-type biological feature sensor and makes it impossible to restore the biological feature from a photograph taken.

Further, in the first aspect, the biological feature voyeurism prevention wearing device 1 according to the second aspect of the present invention is formed by contacting the biological feature 3 region with a thin film of the base portion 4, for example, as shown in FIG. The disturbing portion 5 is a thin film and is formed in contact with the base portion 4.

With this configuration, after the base portion 4 is formed in the biological feature 3 region, the disturbing portion 5 is formed in contact with the base portion 4, so that it is easy to manufacture the biological feature voyeur prevention wearing device.

Further, in the biological feature voyeur prevention wearing device 1 according to the third aspect of the present invention, in the first aspect or the second aspect, the base portion 4 is in close contact with the biological feature 2 at the time of authentication by the contact type biological feature sensor. No bubbles remain.

Here, "when authenticating with the contact-type biological feature sensor, bubbles do not remain in close contact with the biological feature 2" means that the convex portion of the biological feature 3 when the biological body 2 comes into contact with an object (contact-type biological feature sensor). It means that all the bubbles come into contact with the material (base portion 4) and no bubbles other than the bubbles derived from the recesses of the biological feature 3 remain between the living body 2 and the material (base portion 4).

When configured as in this embodiment, no bubbles remain at the time of authentication by the contact-type biometric sensor, so that clear biometric features can be collected.

Further, in the biological feature voyeur prevention wearing device 1 according to the fourth aspect of the present invention, in any one of the first to third aspects, the light scattering characteristic is the recognition of the biological feature 3 by the visible light transmitted through the disturbing portion 5. It is a characteristic having a reflectance that does not hinder the transmission of light from the light source of the optical biological feature sensor 10B.

Here, "the reflectance is such that the visible light transmitted through the disturbing portion hinders the recognition of the biometric region and does not hinder the transmission of light from the light source of the optical biometric sensor" is visible. This is because if the light transmittance is high, the biological feature 3 is recognized by the camera, and if the light transmittance from the light source is high, less light is provided to the biological feature sensor. The reflectance of the acrylic resin used for the base portion 4 is, for example, 4%, and the reflectance of zinc oxide used for the disturbing portion 5 is, for example, 11%, preferably 2 to 15%, more preferably 3 to 12%. ..

With this configuration, the base 4 and disturbances have a reflectance that is appropriate to react normally to the bio-optical biometric sensor and make it impossible to restore biometric features from photographs taken with visible light. 5 can be realized.

Further, in the biological feature voyeur prevention wearing device 1 according to the fifth aspect of the present invention, in any one of the first to fourth aspects, the base portion 4 and the disturbing portion 5 are the optical prism 12 of the optical biological feature sensor 10B. It has a refractive index that does not change the refractive index of.

Here, "the refractive index that does not change the refractive characteristics of the optical prism 12 of the optical biological feature sensor 10B" is defined as the optical path of the measured light when it deviates from the refractive index of the optical glass used for the optical prism 12. This is because there will be an effect such as a change in. The refractive index of the acrylic resin used for the base portion 4 is, for example, 1.49, and the refractive index of zinc oxide used for the disturbing portion 5 is, for example, 2.0, which is significantly different from the refractive index of 1.51 for the optical glass. However, 1 to 5 is preferable, and 1 to 3 is more preferable.

When configured in this way, the base 4 and the disturbance section have a refractive index appropriate for reacting normally to the biooptical biometric sensor and making it impossible to restore the biometric features from a photograph taken with visible light. 5 can be realized.

Further, in the biological feature voyeur prevention wearing device 1 according to the sixth aspect of the present invention, in any one of the first to fifth aspects, the base portion 4 and the disturbing portion 5 are static electricity by the capacitive type biological feature sensor 10A. It has a relative permittivity that does not interfere with the measurement of capacitance.

Here, "the relative permittivity that does not interfere with the measurement of the capacitance by the capacitance type biological feature sensor 10A" is defined as the capacitance when it deviates from the relative permittivity of silicon used for coating the sensor. This is because there will be an effect such as a change in. The relative permittivity of the acrylic resin used for the base portion 4 is, for example, 2.7 to 4.5, and the relative permittivity of zinc oxide used for the disturbing portion 5 is, for example, 1.7 to 2.5. There is no significant deviation from the relative permittivity of 2.4, and 1 to 7 is preferable, and 1 to 5 is more preferable.

With this configuration, the base part 4 and the disturbing part have a relative permittivity appropriate for reacting normally to the optical biometric sensor and making it impossible to restore the biometric features from the photograph taken with visible light. 5 can be realized.

Further, the material for manufacturing a biological feature voyeurism prevention wearing device according to the seventh aspect of the present invention has a base material that is transparent in the visible light region and covers the biological feature 3 region, and has light scattering characteristics in the visible light region. It includes a disturbing substance that covers the biological feature 3.

This aspect is an invention of a material for manufacturing the biological feature voyeurism prevention wearing device 1 according to the first aspect. The base material (material of the base portion 4) and the disturbing substance (material of the disturbing portion 5) may be the same material and have the functions of both materials.

In order to solve the above problems, the biological feature voyeurism prevention method according to the eighth aspect of the present invention is, for example, as shown in FIGS. 21 and 24, a cream-like or gel-like coating having a light scattering property in a visible light region. The step of preparing the material 21 and the application material 22 for attaching the coating material 21 to the surface of the skin having the biological characteristics (S010), and the application having a pattern similar to the biological characteristics using the application device 22. It is a light-disturbing film made of a material 21, and is provided with a step (S020 to S050) of attaching a light-disturbing film that enables authentication by pressing a biological feature and prevents voyeurism of the biological feature. A pattern that is similar to a biological feature, but the certification of the biological feature is not established.

Here, the biometric feature is a pattern representing a physical feature peculiar to each living body such as a fingerprint and a palm print, and is used for biometric authentication. Further, the sticking device 22 is capable of transferring a pattern similar to the biological characteristics to the surface of the skin having the biological characteristics such as a finger. For example, a transfer plate (stencil) that attaches the coating material to the surface of the skin that has biological characteristics through multiple micropores, or a stamper that presses multiple protrusions to attach the coating material to the surface of the skin that has biological characteristics. May be. Further, the “micropore” refers to a hole having a size suitable for transferring biological characteristics such as a fingerprint, for example, a hole having a size of 10 μm to 1 mm. In addition, biological features become difficult to recognize by overlaying pseudo-biological feature patterns, but if advanced analysis technology is used, biological features and pseudo-biological feature patterns can be separated, that is, biological features can be estimated. There is a risk. To prevent this, it is better to use a pseudo-biological feature pattern with a close repetition frequency. Further, "authentication of biological characteristics is not established" means that authentication of biological characteristics is not established with a general authentication device.

By doing so, by overlapping the pseudo-biological feature pattern on the biological feature, a new feature point is generated on the original feature point so that the biological feature cannot be recognized, and the biological feature is analyzed. Since it becomes difficult to separate the pseudo-biological feature pattern, it is possible to prevent the original biological feature from being inferred.

When configured as in this embodiment, it is possible to provide a method for preventing voyeurism of biological features that normally reacts to the biological feature sensors 10A and 10B and makes it impossible to restore the biological features from the photographed photograph. ..

Further, as a method for preventing voyeurism of biological characteristics according to a ninth aspect of the present invention, for example, as shown in FIG. 21, in the eighth aspect, the attachment device 22A has biological characteristics through a plurality of micropores. The transfer plate 22 for attaching the coating material 21 to the surface of the skin, and the coating material 21 transferred through the plurality of micropores forms a pattern similar to the biological characteristics. The holes are arranged.

Here, the micropores are not limited to a dot shape, but may be a line segment shape. It suffices if a pattern similar to the biological characteristics can be formed on the surface of the skin having the biological characteristics.

With this configuration, the coating material is attached to the surface of the skin having biological characteristics through the micropores. Therefore, if the micropores are arranged in a pattern similar to the biological characteristics, a pattern similar to the biological characteristics can be formed on the surface of the skin. Can be formed.

Further, in the method for preventing biometric voyeurism according to the tenth aspect of the present invention, in the eighth aspect, the patching device has the coating material 21 placed on the tips of a plurality of protrusions on the surface of the skin having the biological characteristics. A stamper 22A for pressing a plurality of protrusions to attach the coating material 21 to the surface of the skin having biological characteristics, so that the coating material 21 transferred by pressing the plurality of protrusions forms a pattern similar to the biological characteristics. The plurality of protrusions are arranged on the stamper 22A.

Here, the tip of the protrusion is not limited to a dot shape, but may be a line segment shape. It suffices if a pattern similar to the biological characteristics can be formed on the surface of the skin having the biological characteristics.

With this configuration, the coating material 21 is attached to the surface of the skin having biological characteristics by touching the tip of the protrusions. Therefore, if the protrusions are arranged in a pattern similar to the biological characteristics, a pattern similar to the biological characteristics is formed. can.

Further, in the method of preventing the voyeurism of the biological characteristics according to the eleventh aspect of the present invention, in the eighth aspect, the application device attaches the coating material 21 to the surface of the skin having the biological characteristics through a plurality of micropores. The finger cot 22B to be attached has a plurality of micropores arranged in the finger cot 22B so that the coating material 21 transferred through the plurality of micropores forms a pattern similar to the biological characteristics.

Here, typically, the finger with the finger cot 22B is immersed in the coating liquid, and the coating material 21 is attached to the surface of the skin having biological characteristics.

With this configuration, the coating material 21 is attached to the surface of the skin having biological characteristics through the micropores. Therefore, if the micropores are arranged in a pattern similar to the biological characteristics, a pattern similar to the biological characteristics can be formed.

Further, in the method of preventing the voyeurism of the biological characteristics according to the twelfth aspect of the present invention, in the eighth aspect, the patching device has a plurality of application materials 21 after the coating material 21 is applied to the surface of the skin having the biological characteristics. A transfer plate 22C (not shown) to which the coating material 21 on the surface of the skin is irradiated with ultraviolet rays to cure it through the micropores and the coating material is attached. The coating material that is cured by the ultraviolet rays passing through the plurality of micropores is a biological feature. A plurality of micropores are arranged in the transfer plate 22C so as to form a pattern similar to that of the above.

With this configuration, the coating material 21 is attached to the surface of the skin having the biological characteristics by ultraviolet irradiation. Therefore, if the arrangement of the micropores is similar to the biological characteristics, a pattern similar to the biological characteristics can be formed. Further, the portion not irradiated with ultraviolet rays can be removed by, for example, washing with water.

Further, as a method for preventing voyeurism of biological characteristics according to the thirteenth aspect of the present invention, in the eighth aspect, the sticking device is drawn on a transfer tape 34 on which a plurality of similar patterns are drawn and on the transfer tape 34. A stamper for pressing a similar pattern on the surface of the skin having a biological pattern, and a pair of windings that move the transfer tape 34 so that the pattern to be transferred among a plurality of similar patterns is at the position of the stamper. Equipped with a reel.

With this configuration, the patterns of the transfer tape 34 on which a plurality of similar patterns are drawn can be sequentially transferred to the finger. Can be different. In order to transfer a similar pattern drawn on the transfer tape 34 to the surface of the skin having a biological pattern, the pattern of the transfer tape 34 is formed with a plurality of micropores as in the ninth aspect or in the tenth aspect. It can be realized by forming it with a plurality of protrusions as described above.

Further, in the method for preventing the voyeurism of the biological feature according to the 14th aspect of the present invention, in any one of the 9th to 13th aspects, a similar pattern to be attached to the surface of the living body by using the attaching device 22 is used. It is different each time it is pasted.

With this configuration, the similar pattern attached to the surface of the living body differs from time to time, making it difficult for the voyeur to guess the pattern.

Further, in the method for preventing the voyeurism of the biological feature according to the fifteenth aspect of the present invention, for example, as shown in FIG. 33, in any one of the ninth to thirteenth aspects, the similar pattern is close to the biological feature. It is a pattern having a spatial frequency.

With this configuration, a spatial frequency close to the biological characteristics is used for the pseudo fingerprint. Therefore, by superimposing the pattern on the original fingerprint, the photographed fingerprint has false feature points in addition to the correct feature points of the original fingerprint. Is added, it is recognized as an erroneous biological feature as a whole, and the authentication of the biological feature is not established. Further, since a spatial frequency close to the biological characteristics is used for the pseudo-fingerprint, it becomes very difficult to separate the original fingerprint and the pseudo-fingerprint, and the original fingerprint cannot be estimated.

In order to solve the above problems, the method for manufacturing a biological feature voyeurism prevention wearing device according to the sixteenth aspect of the present invention is, for example, as shown in FIGS. 21 and 24, in a creamy state having a light scattering property in a visible light region. A step (S010) for preparing a sticking device 22 for sticking the coating material 21 on the surface of the skin having a gel-like coating material and biological characteristics, and using the sticking device 22, a pattern similar to the biological characteristics can be obtained. It is a light-disturbing film made of the coating material 21 to be provided, and is provided with a step (S020 to S050) of attaching a light-disturbing film that enables authentication by pressing a biological feature and prevents voyeurism of the biological feature, and has a similar pattern. Refers to a pattern similar to a biological feature, but the certification of the biological feature is not established.

Here, the biological feature voyeurism prevention wearing device manufactured by the manufacturing method according to this embodiment corresponds to a product produced by the method, which remains formed on the surface of the skin having biological features. Here, it corresponds to the product produced by the light-disturbing film formed on the surface of the skin. When configured as in this embodiment, a method for manufacturing a biological feature voyeurism prevention device that normally reacts to the biological feature sensor and prevents the voyeurism of the biological feature that makes it impossible to restore the biological feature from the photograph taken. Can be provided.

In order to solve the above problems, the manufacturing set of the biological feature voyeurism prevention fitting for preventing the voyeurism of the biological feature according to the seventeenth aspect of the present invention has a light scattering characteristic in the visible light region, for example, as shown in FIG. 24. A biological feature voyeurism prevention attachment that prevents voyeurism of biological characteristics, including a cream-like or gel-like coating material 21 having a biological characteristic and a sticking device 22 for attaching the coating material 21 to the surface of the skin having biological characteristics. The sticking device 22 is a light-disturbing film made of a coating material 21 having a pattern similar to that of the biological feature, and enables authentication by pressing the biological feature to prevent voyeurism of the biological feature. It is for attaching a light scattering film, and corresponds to any one of the ninth to thirteenth items.

When configured as in this embodiment, a thin film manufacturing set that normally reacts to the biological feature sensors 10A and 10B and prevents the voyeurism of the biological feature that makes it impossible to restore the biological feature from the photographed photograph is provided. be able to.

Further, the manufacturing set of the biological feature voyeurism prevention fitting for preventing the voyeurism of the biological feature in the eighteenth aspect of the present invention is the attachment device in the seventeenth aspect, for example, as shown in FIGS. 34 to 36. The transfer tape 34 on which a plurality of similar patterns are drawn, the stamper for pressing the similar pattern drawn on the transfer tape 34 against the surface of the biological pattern, and the position of the stamper among the plurality of similar patterns to be transferred. It is provided with a pair of take-up reels 31 and 32 for moving the transfer tape 34 so as to come to.

With this configuration, the patterns of the transfer tape 34 on which a plurality of similar patterns are drawn can be sequentially transferred to the finger. Can be different.

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Further, the method for preventing voyeurism of a biological feature according to the nineteenth aspect of the present invention enables authentication by pressing the biological feature by forming a pattern similar to the biological feature on the surface of the skin having the biological feature. It is a method for preventing voyeurism of a biological feature, and a similar pattern is a pattern similar to a biological feature but in which authentication of the biological feature is not established, and is a pattern having a spatial frequency close to that of the biological feature.

With such a configuration, since a spatial frequency close to the biological characteristics is used for the pseudo fingerprint, it becomes very difficult to separate the original fingerprint and the pseudo fingerprint, and the original fingerprint cannot be estimated.

Further, the manufacturing set of the biological feature voyeurism prevention wearing device for preventing the voyeurism of the biological feature according to the twentieth aspect of the present invention includes a coating material capable of forming a pattern similar to the biological feature on the surface of the skin having the biological feature. A patching device for forming a pattern similar to the biological feature using the coating material on the surface of the skin having the biological feature is provided, and the coating material and the patching device prevent the voyeurism of the biological feature in the nineteenth aspect. Refers to the coating material and the affixing device described in the method.

With such a configuration, since a spatial frequency close to the biological characteristics is used for the pseudo fingerprint, it becomes very difficult to separate the original fingerprint and the pseudo fingerprint, and the original fingerprint cannot be estimated.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a biological feature voyeurism prevention wearing device and a voyeurism prevention method that normally react to a contact-type biological feature sensor and make it impossible to restore biological features from a photograph taken.

It is a figure for demonstrating the principle of a fingerprint sensor. It is a figure which shows the example of the fingerprint image acquired by the fingerprint sensor. It is a figure for demonstrating the maneuver matching method. It is a figure which shows the example of the captured image and adaptive thresholding processing. It is a figure which shows the example of the fingerprint image by the shooting distance. It is a figure which shows the configuration example of the fingerprint voyeurism prevention wearing tool 1 in Example 1. FIG. It is a figure which shows the example of the manufacturing method of the fingerprint voyeurism prevention wearing tool 1 in Example 1. FIG. It is a figure which shows the result of applying the pattern directly on the fingerprint surface. It is a figure which shows the influence of the seal material on the fingerprint sensor. It is a figure which shows the influence on the fingerprint sensor of the film thickness. It is a figure for demonstrating the transparency of an optical sensor with respect to various materials. It is a figure which shows the example of the sample for pattern study. It is a figure for demonstrating the influence of a fill color. It is a figure which shows the example of the matching result of a sample pattern. It is a figure for demonstrating the effect of noise on a fingerprint image. It is a figure for demonstrating the influence of a dot size on a fingerprint image. It is a figure for demonstrating the influence of a dot arrangement on a fingerprint image. It is a figure which shows the example of the prototype used for evaluation. It is a figure which shows the example of the number of matches by the shooting distance. It is a figure which shows the average match score by the shooting distance. It is a figure which shows the manufacturing procedure of the pseudo fingerprint in Example 1. FIG. It is a figure which shows the example of the stencil which has a pseudo fingerprint and was made by the silk screen plate making. It is a figure which shows the example of the appearance of the pseudo fingerprint transferred to the surface of a finger. It is a flow diagram of the pseudo fingerprint production in Example 1. FIG. It is a figure (the 1) for demonstrating the disturbing effect on the fingerprint detection from a photograph. It is a figure (the 2) for demonstrating the disturbing effect on the fingerprint detection from a photograph. It is a figure for demonstrating the transparency (authentication property) with respect to a capacitive fingerprint sensor. It is a figure for demonstrating the transparency (authentication) to an optical fingerprint sensor. It is a figure which shows the influence on the acquired image by a photographed image by the mixing ratio of a paint and a solvent. It is a figure which shows the influence on the image acquired by a fingerprint sensor by the mixing ratio of a paint and a solvent. It is a flow diagram of the pseudo fingerprint production in Example 2. FIG. It is a flow diagram of the pseudo fingerprint production in Example 3. FIG. It is a flow diagram of the pseudo fingerprint production in Example 4. FIG. It is a flow diagram of the pseudo fingerprint production in Example 5. It is a figure (the 1) which shows the example of the pseudo fingerprint transfer in this Example 10. It is a figure (the 2) which shows the example of the pseudo fingerprint transfer in this Example 10. It is a figure (the 3) which shows the example of the pseudo fingerprint transfer in this Example 10. It is a figure which shows the example of the combination of a carrying case and a separate package. It is a figure which shows the carrying case and the separate package separately. It is a figure which shows the process of taking out a transfer sticker from a separate package, and transferring a pseudo fingerprint pattern to a finger. It is a figure which shows the example of attaching a transfer sticker to a finger and taking a photograph. It is a figure which shows the example of the pseudo fingerprint pattern.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and duplicated description will be omitted.

[Fingerprint sensor]

FIG. 1 is a diagram for explaining the principle of the fingerprint sensor. FIG. 1A is a capacitive fingerprint sensor, and FIG. 1B is an optical fingerprint sensor. These are the fingerprint sensors that are widely used today. The capacitive fingerprint sensor 10A measures the potential difference that changes depending on the distance between the contact surface 11 and the skin 2, and maps it to the brightness of the pixel. On the other hand, the optical fingerprint sensor 10B irradiates the contact surface 11 with the irradiation light from the light source 15 using the prism 12, captures the reflected light from the contact surface 11 with the image sensor 16, and maps it to the brightness of the pixels. ..

FIG. 2 shows an example of a fingerprint image acquired by the fingerprint sensor. FIG. 2A is a fingerprint 3 obtained by the capacitance method, and FIG. 2B is a fingerprint 3 obtained by the optical method. In each case, the luminance distribution is minimum at the ridge 13 of the fingerprint 3 and maximum at the valley line 14 (see FIG. 1), so that fine irregularities of the fingerprint can be mapped with high contrast close to binarization. In FIG. 1 (a), assuming that the capacitance between the contact surface 11 and the valley line 14 is C _ir and the capacitance of the passion film (silicon oxide film) 17 on the sensor surface is C _ox , the capacitance at the ridge line 13 is C _ox . The potential difference is _Voltage , the capacitance at the valley line 14 is C _v (1 / C _v = 1 / C _ox + 1 / C _air ), and the potential difference is V _valley .

The capacitive fingerprint sensor 10A detects the difference in capacitance between the finger and the electrode. Materials such as rubber, plastic, and silicon that can be used as the thin film material used for the biological feature voyeurism prevention wearing tool 1 in this embodiment have a relative permittivity of about 2.0 to 5.0. On the other hand, the relative permittivity of air is about 1.0, and the difference in capacitance is clear between the case where the detection pixel passes through air (valley line) and the case where it does not (ridge line). Does not interfere with the distinction between ridges and valleys. The optical fingerprint sensor 10B detects the difference in the scattering characteristics between the contact portion and the air layer. The light from the light source 15 is totally reflected at the boundary 11 between the prism and the air layer, and is incident on the inside of the skin at the ridge line 13, so that it is scattered in all directions and only a very small amount of light is detected. Since a high-brightness LED is mainly used as the light source 15, even if the thin film is used, the light passes through the thin film and does not interfere with the distinction between the ridge line 13 and the valley line 14.

[Acquisition of fingerprints from captured images]

FIG. 3 is a diagram for explaining a maneuver matching method. FIG. 3A is a diagram showing an example of a fingerprint image, and FIG. 3B is a diagram showing an example of a feature point (maneuver). The method that is mainstream at the stage of recognizing a fingerprint from an acquired fingerprint image is called a maneuver matching method. In this method, feature points (maneuvers) are detected from a fingerprint image, and their arrangements are compared to determine the identity. The endpoints and branches of the ridge 13 are used as feature points.

FIG. 4 shows an example of a captured image and adaptive threshold processing. FIG. 4A is a captured image (fingerprint image), and FIG. 4B is a captured image (fingerprint image) after adaptive thresholding. The fingerprint image taken by a digital camera is an image obtained by sampling the shadow created by the fine unevenness of the fingerprint by the ambient light with an optical sensor (image sensor of the camera). From the viewpoint of acquiring fingerprint data, it is inferior to the contact type fingerprint sensor.

Since the fingerprint image contains a lot of noise, the image is enhanced prior to the detection of the feature points. The extracted feature points are expressed as p = {x, y, t} using the x, y coordinates and the direction t, and are stored in the list of feature points (fingerprint template). Fingerprint matching can be regarded as a pattern matching problem between these point clouds.

Therefore, it is difficult to restore the fingerprint directly from the captured fingerprint image, but by applying adaptive thresholding, it is effective to change the global shadow due to ambient light and to make minute noise below the ridge spacing. Can be removed.

The image thus obtained can be expected to have sufficient quality to detect feature points if it has a resolution capable of distinguishing the ridges 13 and the valleys 14 of the fingerprint. Therefore, using a commercially available digital camera (Canon EOS 70D, 20.4 million pixels, standard zoom, focal length 135 mm), the distance at which fingerprints can be detected was estimated from the captured image.

FIG. 5 shows an example of a fingerprint image for each shooting distance. 5A is a fingerprint image at a shooting distance of 1.5 m, FIG. 5B is a shooting distance of 3 m, and FIG. 5C is a fingerprint image at a shooting distance of 4.5 m. Table 1 shows the estimation results of the ridge spacing for each shooting distance. Two ridges can be distinguished by 2 pixels when the distance between the ridges is horizontal or vertical, and 2.82 pixels when the distance between the ridges is 45 degrees, so with this camera, you can shoot at a distance of about 5 m or less. It can be said that fingerprints may be detected from the image.

In this embodiment, a finger attachment to prevent fingerprint voyeurism will be described. The fingerprint voyeurism prevention wearing device 1 in this embodiment has a transparent base portion 4 applied to the finger surface and an opaque disturbing portion 5 printed on the surface of the base portion 4.

[Biological features Voyeur prevention equipment]

FIG. 6 shows a configuration example of the fingerprint voyeurism prevention wearing tool 1 in the first embodiment. FIG. 6A is an example of an external view of the fingerprint voyeurism prevention wearing tool 1, and FIG. 6B is a diagram showing a configuration example of the fingerprint voyeurism prevention wearing tool 1. The fingerprint voyeur prevention wearing device 1 has a transparent base portion 4 applied to the finger surface and an opaque disturbing portion 5 printed on the surface of the base portion 4. The disturbing portion 5 is patterned. The base portion 4 is in close contact with the skin 2 to smooth out the unevenness of the fingerprint 3, and the opaque disturbing portion 5 obscures the details of the fingerprint 3 to interfere with the detection of feature points.

In FIG. 6B, the base portion 4 covers the unevenness of the surface of the skin 2 to flatten the surface. Since the water-soluble acrylic resin as the material of the base portion 4 becomes creamy when dissolved in water, it can cover the unevenness of the surface of the skin 2 and even and flatten the surface when applied to the finger surface. A pattern of disturbing portions 5 is formed on the flattened surface. When the base portion 4 comes into contact with the ridge line 13 of the fingerprint 3 without exception, an air layer is formed at the portion of the valley line 14. This air layer is necessary for the fingerprint sensor to distinguish between the ridges 13 and the valleys 14 of the fingerprint (see FIG. 1). On the other hand, if extra air bubbles other than the valley line 14 enter between the skin and the base portion 4, the entire surface becomes overexposed and the ridge line 13 and the valley line 14 cannot be distinguished (see FIG. 9).

The biological feature voyeur prevention wearing device 1 has a base portion 4 that is transparent in the visible light region and covers the biological feature 3 region, and a disturbing portion 5 that has light scattering characteristics in the visible light region and covers the biological feature 3 region. To prepare for. Preferably, the base portion 4 is formed of a thin film in contact with the biological feature 3 region, and the disturbing portion 5 is formed of a thin film in contact with the base portion 4. Further, the base portion 4 preferably covers the entire biological feature 3 region, and the disturbing portion 5 may cover a part or the entire biological feature 3 region.

FIG. 7 is a diagram showing an example of a manufacturing method of the fingerprint voyeurism prevention wearing tool 1 in the first embodiment. 7 (a) is a diagram showing a base material coating step, FIG. 7 (b) is a diagram showing a disturbed portion material coating step, and FIG. 7 (c) is a diagram showing a disturbed portion transfer step. First, a water-soluble acrylic resin as a base material (material of the base portion) is applied to the finger surface with a brush. Next, the cosmetic puff is impregnated with an acrylic paint (a zinc oxide pigment dissolved in an acrylic resin solvent) as a disturbing substance (material of the disturbing part). Then, using a stencil sheet on which the pattern 4 for nail art is drawn (perforated), the pattern 4 is transferred to the fingertips.

Acrylic paint blends well with acrylic resin, facilitating pattern transfer. FIG. 6A is an appearance of the fingerprint voyeurism prevention wearing tool 1. The pattern is transferred to the fingertips. The pattern is a repeating pattern and is suitable for covering many feature points of fingerprints.

The conditions of the fingerprint voyeur prevention wearing device 1 are as follows.

(1) Fingerprint recognition by the contact type fingerprint sensor 10 is possible.

(2) It is impossible to acquire fingerprint data from the photograph taken and the photograph that has undergone arbitrary image processing after photography.

Further, the material for manufacturing the fingerprint voyeur prevention wearing device 1 in Example 1 is a base material that is transparent in the visible light region and covers the biological feature 3 region, and has light scattering characteristics in the visible light region and is a living body. It comprises a disturbing substance that covers feature 3.

Here, the characteristics of the base portion 4 and the disturbing portion 5 will be touched upon.

The disturbance unit 5 is required to have a reflectance that does not hinder the recognition of the biometric region by the transmitted visible light and does not hinder the transmission of the light source of the optical biometric sensor. This is because if the transmittance of visible light is high, the biological feature 3 is recognized by the camera, and if the reflectance of the light from the light source is high, less light is provided to the biological feature sensor. The reflectance of the acrylic resin used for the base portion 4 is, for example, 4%, and the reflectance of zinc oxide used for the disturbing portion 5 is, for example, 11%, preferably 2 to 15%, more preferably 3 to 12%. ..

The base portion 4 and the disturbing portion 5 are required to have a refractive index that does not change the refractive index of the optical prism 12 of the optical biological feature sensor 10B. This is because if the refractive index deviates from the refractive index of the optical glass used for the optical prism 12, the optical path of the measured light may change. The refractive index of the acrylic resin used for the base portion 4 is, for example, 1.49, and the refractive index of zinc oxide used for the disturbing portion 5 is, for example, 2.0, which is significantly different from the refractive index of 1.51 for the optical glass. However, 1 to 5 is preferable, and 1 to 3 is more preferable.

The base portion 4 and the disturbing portion are required to have a relative permittivity that does not interfere with the measurement of the capacitance by the capacitance type biological feature sensor 10A. This is because if the relative permittivity of silicon used for coating the sensor deviates from the relative permittivity, the capacitance may change. The relative permittivity of the acrylic resin used for the base portion 4 is, for example, 2.7 to 4.5, and the relative permittivity of zinc oxide used for the disturbing portion 5 is, for example, 1.7 to 2.5. There is no significant deviation from the relative permittivity of 2 and 4, 1.7 to 7 is preferable, and 2 to 5 is more preferable. Further, it is preferable that the base portion 4 is in close contact with the living body and does not leave air bubbles at the time of authentication by the contact type biological feature sensor. Further, the base portion 4 can be deformed according to the movement of the living body 2, that is, when the living body comes into contact with an object, the base portion 4 becomes flat along the contact surface, and when the living body does not come into contact with the object, the base portion 4 becomes the shape of the living body. It is preferable that the three-dimensional shape is along the line and that wrinkles and cracks that hinder the operation do not occur.

[Base part]

FIG. 8 shows the result of applying the pattern directly to the fingerprint surface. 8 (a) is an external view, and FIG. 8 (b) is a fingerprint image. The base portion 4 is used to smooth out the unevenness of the ridges and valleys of the fingerprint and flatten the pattern to be printed on the surface thereof. When the pattern was applied directly to the surface of the fingerprint 3, the ink soaked into the valley line of the fingerprint, and conversely, the result was that the fingerprint was emphasized.

FIG. 9 shows the influence of the seal material (material of the base portion 4) on the fingerprint sensor. 9 (a) is an external view, and FIG. 9 (b) is a fingerprint image. The base portion 4 must be in close contact with the finger surface. When a gap or a bubble other than the bubble derived from the concave portion of the biological feature 3 is generated between the finger and the fingerprint 3, the portion of the fingerprint 3 does not touch the contact surface of the fingerprint sensor, so that the read image is missing. This is why it is difficult to achieve with a simple seal.

FIG. 10 shows the effect of the film thickness on the fingerprint sensor. FIG. 10A is an image taken by the capacitive sensor 10A (see FIG. 1) (three types of thin, medium, and thick), and FIG. 10B is an image taken by the optical sensor 10B (see FIG. 1) (see FIG. 1). There are three types: thin, medium, and thick). The thickness of the base portion 4 affects the trade-off relationship between the recognition rate of the fingerprint sensor and the disturbing effect on the photograph. If the base portion 4 is too thick, the image will be blurred and the details will be crushed by the capacitive fingerprint sensor. With an optical fingerprint sensor, bubbles like bubbles occur. On the other hand, if the base portion 4 is too thin, the unevenness of the fingerprint cannot be completely smoothed. May cause shading in the pattern.

FIG. 11 is a diagram for explaining the transparency of the optical sensor to various materials. The materials are water in FIG. 11 (a), tissue paper in FIG. 11 (b), plastic in FIG. 11 (c), PET (polyethylene terephthalate) (0.2 mm thickness) in FIG. 11 (d), and FIG. 11 (e). ) Is an example of PET (0.5 mm thickness), and FIG. 11 (f) is an example of PET (0.7 mm thickness). In FIGS. 11A to 11C, the material is present in a part of the fingertip. Due to the presence of moisture, the total reflection conditions are disrupted, resulting in dark lines. In addition, total reflection occurs due to the intervention of the air layer, resulting in a bright line. Further, when the material is not in close contact with the contact surface, the air layer causes blurring of the image and whitening. In FIGS. 11 (d) to 11 (f), the thickness is changed by the material PET (polyethylene terephthalate). When the material is in close contact with the contact surface, the image quality is constant regardless of the thickness of the material.

〔pattern〕

When the pattern is superimposed on the surface of the fingertip, a thin film is inserted between the contact surface of the fingerprint sensor and the finger. The presence of this thin film should not interfere with the fingerprint sensor's determination of ridges and valleys.

FIG. 12 shows an example of a sample for pattern study. FIG. 12 (a) is a sample filled with light gray, FIG. 12 (b) is a sample filled with the average skin color, and FIG. 12 (c) is a sample filled with the surrounding color. In each of FIGS. 12 (a) to 12 (c), the left is a photograph taken and the right is a diagram of an image after adaptive thresholding. The design of the pattern printed on the surface must take into account its direct impact on feature point detection and be designed to withstand arbitrary image processing. Therefore, we investigated the optimum pattern density by simulating a variable-sized dot pattern superimposed on a fingerprint image and matching it with a template using a fingerprint sensor. The dot density was set to 10 lines, 20 lines, and 40 lines (the number of dots per inch), and the dot size was adjusted so that the coverage of the pattern was 20%, 40%, and 60%. In addition, three types of filling methods were set for the same pattern (see FIGS. 12 (a) to 12 (c)), and differences in match scores were compared.

FIG. 13 is a diagram for explaining the influence of the fill color. FIG. 13 (a) is a sample painted in white, and FIG. 13 (b) is a result of painting in a color close to the skin. In both FIGS. 13 (a) and 13 (b), the left is an external view and the right is an image after adaptive thresholding. The pattern to be printed must be resistant not only to the photograph taken, but to any image processing using it. The effect of noise on fingerprint recognition is minimized when the brightness of the pattern is the same as the color of the skin. In FIG. 13B, it can be seen that the edges of the pattern are clearly weakened, and the pattern itself disappears in some parts.

FIG. 14 shows an example of the matching result of the sample pattern. FIG. 14 (a) is a sample filled with light gray, FIG. 14 (b) is a sample filled with the average skin color, and FIG. 14 (c) is a sample filled with the surrounding color. The dot density was set to 10 lines, 20 lines, and 40 lines (the number of dots per inch). The vertical axis is the match score and the horizontal axis is the coverage. Commercial fingerprint recognition software VeriFinger was used for matching. Matching with the template image acquired by the fingerprint sensor in advance is performed, and a match score of 48 or more is regarded as a match. This numerical value is a standard for determining the same fingerprint with FAR (false acceptance rate: probability of misidentifying another person as the person) 0.01%. If the feature point extraction fails, the match score is set to zero.

Light gray can effectively interfere with voyeurism in all cases, but often fails to interfere with painting with the average skin color or the surrounding color. If the coverage is low, interference will fail in most cases, and even if the coverage is the same, the larger the number of lines (that is, the smaller the dot size), the lower the interference effect. From this result, it can be said that a pattern having a coverage of 60% or more and a large dot size is indispensable.

Next, size requirements and density requirements were determined for these sample patterns. The ridge spacing (average 10.0 pixels) was obtained from the fingerprint photograph taken from a distance of 1 m, and the kernel size (11 pixels) effective for emphasizing the ridge was obtained from the ridge spacing.

Table 2 shows the judgment result of the size requirement, and Table 3 shows the judgment result of the density requirement. There are three types of dot patterns that simultaneously satisfy these two requirements: 10-line 40%, 10-line 60%, and 20-line 60%. This is in general agreement with the matching result in FIG. In Tables 2 and 3, r is the dot radius, h is the ridge spacing, d is the dot spacing, and k is the kernel size (the size of the kernel used for the Gaussian filter) (see FIG. 17).

FIG. 15 is a diagram for explaining the effect of noise on the fingerprint image. 15 (a) shows the case where the dots are darker than the skin, FIG. 15 (b) shows the case where the dots and the skin are as bright as each other, and FIG. 15 (c) shows the case where the dots are brighter than the skin. Both are the results of superimposing a dot pattern on the fingerprint image and performing adaptive threshold processing. This dot pattern (filter) acts as a kind of edge detector and emphasizes the contrast gap in the image.

The effects of this dot pattern (noise) on the detection of feature points are the following three points.

(1) False feature points occur. If the dots are darker than the skin or brighter than the skin, a black and white ring will occur on the outside of the dots. If the dots are darker than the skin, the outer bright ring breaks the fingerprint ridge, and if the dots are brighter than the skin, the outer dark ring connects to the fingerprint ridge. As a result, extra endpoints and branches are added to the original ridge, and many false feature points are generated.

(2) The original feature points disappear. If there is a feature point around the dot, the ridge will be split or connected to the two rings mentioned above, so the correct connection cannot be predicted and the original feature point cannot be detected. Since the size of the generated ring is considered to be the range of influence of the filter, if the kernel size of the filter is k, the thickness of the ring can be estimated to be k√2 / 2.

(3) The feature points are hidden. When the dots and the skin have the same brightness, no ring is generated because there is no contrast, and the effect as in the case where there is a difference in brightness cannot be expected. In this case, since there is only an effect of hiding the feature points by dots, the noise effect is very limited.

FIG. 16 is a diagram for explaining the influence of the dot size on the fingerprint image. FIG. 16A shows a case where the dots are on one ridge, and FIG. 16B shows a case where the dots are on two ridges. If the dot is on one ridge, it is far from the other ridges and has no effect on feature point detection. When the dots are on two or more ridges, ambiguity occurs in the connection of the ridges, so a positive disturbing effect on the detection of feature points can be expected. Therefore, in order to generate the disturbing effect, r> h is a necessary condition, where r is the dot radius and h is the ridge spacing.

FIG. 17 is a diagram for explaining the influence of the dot arrangement on the fingerprint detection on the fingerprint image. The noise effect extends to an area wider than the dot radius. Since the maneuver matching method can accurately match only some feature points, it is necessary for noise to affect the entire image.

If the dot density is 10 lines, 20 lines, and 40 lines (the number of dots per inch), the dot radius is r, the filter kernel size is k, and the dot spacing is d, the noise effect radius is r + k√2 /. Therefore, r> d / 2 + (k√2) / 2 is a necessary condition for the influence of noise over the entire image.

〔evaluation〕

FIG. 18 shows an example of the prototype used for the evaluation. FIG. 18A is an external view, and FIG. 18B is a design pattern. Based on the studies so far, we created a prototype of a biometric anti-voyeur device (Biometric Jammer) and evaluated its effectiveness for four subjects.

Table 4 shows the evaluation environment. The evaluation procedure is as follows.

(1) Scan the surface of the finger (right thumb) without the prototype with a fingerprint sensor and register it as a template.

(2) Take a picture of the same finger with a digital camera and match it with the template (1).

(3) Attach the prototype to the same finger, shoot with a digital camera, and match with the template (1).

(4) The captured image (3) is filled with the pattern portion with the average color of the surroundings, and matching with the template (1) is performed.

Prior to matching with the template, the captured images (2), (3), and (4) are enlarged / reduced to the same size as the template by the image processing software, and then adaptive threshold processing is performed with the kernel size k = 11. VeriFinger is used for matching, and a match score of 48 or higher is regarded as a match.

FIG. 19 shows an example of the number of matchers by shooting distance. FIG. 19A is an example of the authentication result by the capacitance method, and FIG. 19B is an example of the authentication result by the optical method. The vertical axis is the number of matches and the horizontal axis is the shooting distance. The number of matches when the prototype is installed is 0. FIG. 20 shows the average match score for each shooting distance. FIG. 20A is an example of the authentication result by the capacitance method, and FIG. 20B is an example of the authentication result by the optical method. The vertical axis is the match score and the horizontal axis is the shooting distance. The match score when the prototype is attached is 0.

When the prototype was not attached, all subjects succeeded in matching fingerprints from the captured images. The longest match distance is 3m, which is not a difficult distance for a voyeur to shoot without being noticed by the photographer.

When the prototype was attached, feature point detection failed in all subjects and distances (match score 0). The same was true when the pattern was filled. The pattern density is close to the dot pattern "10 lines 40%", but the filled image showed a higher interference effect than the previous simulation. This is due to insufficient processing of fringes on the border line in the process of detecting the filled area from the captured image. That is, the result was that most of them were not certified.

Table 5 shows an example of the authentication result by the fingerprint sensor. (A) shows the certification result of the capacitance method, and (b) shows the certification result of the optical method. Next, we attached the prototype created this time and verified whether or not the fingerprint authentication by the fingerprint sensor was successful. For each fingerprint sensor model, the template and the image for authentication were read 3 times each, and matching was performed 9 times in total, and the maximum and minimum values of the number of successes and the match score were totaled. Table 5 shows the results.

Matching was successful in all trials for 3 out of 4 people. The large variation in match scores is a result of unstable finger placement on the fingerprint sensor, which is also the case with normal fingerprint authentication. The particularly low number of successes for subject B was a result of unstable finger placement when reading the template, and the match score was generally low because only a part of it always matched. That is, the result was that most of them were certified.

As described above, according to the present embodiment, it is possible to provide a biological feature voyeur prevention wearing device that normally reacts to the contact-type biological feature sensor and makes it impossible to restore the biological feature from the photograph taken.

The light source 15 of the optical biological feature sensor 10B may be visible light. As described above, since the disturbing portion 5 has a predetermined reflectance, the scattering of light in the disturbing portion 5 is neither total reflection nor non-transmissive (total blocking). For this reason, when the biological feature voyeur prevention wearing device of the present embodiment is attached to a finger, even if an attempt is made to take a voyeur with a camera, the light is scattered by the disturbing portion 5 on the surface and the finger looks white, so that the fingerprint voyeur cannot be performed. On the other hand, the optical biometric sensor 10B having a configuration using the prism of FIG. 1B can detect the difference in the scattering characteristics between the contact portion of the base portion 4 with the ridge line 13 and the air layer 14, and the fingerprint authentication is normal. Can be done. The reason for obtaining such an effect is based on the difference in sensitivity set in each image sensor of the digital camera and the optical biometric sensor. Since the image sensor of the optical biological feature sensor is set to have high sensitivity to the wavelength of the light source, it can detect the difference in the brightness of the light transmitted through the disturbing portion 5 described later, but the image sensor of the digital camera has a wide range of wavelengths. Since it is set to capture the light of the above, it looks white as a whole due to the scattered light from the disturbing portion 5.

In the optical biological feature sensor 10B, the principle of correctly reading the fingerprint on which the wearing tool is attached is as follows. A part of the light emitted from the light source passes through the prism 12 and the disturbing portion 5. When the boundary between the disturbing portion 5 (or the base portion 4) and the skin is a ridge line 13, the light is scattered in all directions on the surface of the skin and does not reach the image sensor 16. On the other hand, when the boundary between the disturbing portion 5 (or the base portion 4) and the skin is the valley line 14 (air), the light is totally reflected there and reaches the image sensor 16. As described above, since the image sensor 16 has high sensitivity to the wavelength of the light source, even if a part of the incident light is scattered by the disturbing portion 5, the image sensor 16 fingerprints with the difference in brightness between the ridge line 13 and the valley line 14. Can be recognized. Further, since the image sensor 16 is located in the immediate vicinity of the fingerprint, the optical biological feature sensor 10B has higher sensitivity than the voyeur camera and can accurately grasp the fingerprint.

In the first embodiment, an example in which the pattern of the disturbing portion 5 is printed on the surface of the base portion 4 is described as the biological feature voyeur prevention wearing tool, but in the second embodiment, the biological feature voyeur prevention wearing tool is a finger cot on which the pattern is printed. Alternatively, an example of gloves will be described.

That is, a finger cot or gloves are used to prevent the wearer from coming off the finger. A finger cot or glove is used on the base 4 and the pattern of the disturbing 5 is printed on its surface. Printing is not limited to transfer, and general-purpose printing such as print printing, screen printing, and inkjet printing can also be used. Other configurations are the same as in Example 1, and as in Example 1, biometric voyeurism that makes it impossible to restore biometric features from the photograph taken while responding normally to the contact-type biometric sensor. Preventive fittings can be provided.

In the third embodiment, an example in which the biological feature voyeurism prevention wearing device is a finger cot or a glove with an embedded pattern will be described.

In Example 2, an example in which the pattern is formed on the surface of the finger cot or the glove has been described, but in this embodiment, an example in which the pattern is embedded inside the finger cot or the glove will be described. That is, when the pattern is sandwiched between two sheets to manufacture a finger cot or a glove. Printing on one sheet is not limited to transfer, and general-purpose printing such as print printing, screen printing, and inkjet printing can also be used.

Other configurations are the same as in Example 1, and the prevention of voyeurism of biological characteristics makes it impossible to restore the biological characteristics from the photographed photograph while reacting normally to the contact-type biological characteristic sensor as in Example 1. We can provide fixtures.

In Example 4, a case where the biological feature is a palm print will be described.

Like fingerprints, palm prints are patterns peculiar to living organisms, and have irregularities due to ridges and valleys. Therefore, in order to prevent voyeurism, the biological feature voyeurism prevention device, like the fingerprint, is transparent in the visible light region and has a base portion 4 covering the biological feature 3 region and a light scattering characteristic in the visible light region. It also includes a disturbing portion 5 that covers the biological feature 3 region.

Therefore, as in the first embodiment, it is possible to provide a biological feature voyeur prevention wearing device that normally reacts to the contact-type biological feature sensor and makes it impossible to restore the biological feature from the photograph taken.

It can also be applied to Example 2 and Example 3.

FIG. 21 shows a procedure for manufacturing the biological feature voyeurism prevention wearing device in this embodiment. In this embodiment, an example in which the base layer is not used will be described. 21 (a) is a diagram showing a process of preparing paint, FIG. 21 (b) is a diagram showing a process of applying paint to a silicon rubber sheet, and FIG. 21 (c) is a diagram showing a pseudo pattern of a stencil transferred to a finger surface. It is a figure which shows the process.

First, prepare the coating material and the application device. The coating material is a cream-like or gel-like paint having a light scattering property in the visible light region, and for example, a paint obtained by mixing a water-soluble acrylic paint with an acrylic solvent is used. The higher the concentration, the greater the disturbing effect. However, when the concentration is increased, the acrylic paint dries quickly, so the finish is quick. In addition, if the concentration is too high, the paint will dry out and become difficult to apply. Here, acrylic paint is used as an experimental material, and a material that is safe for the human body is preferable, so there is a possibility of improvement or change at a practical level. Candidates for materials that are safe for the human body include, for example, silicone rubber, latex, and artificial skin for medical use.

The sticking device 22 is a device for sticking the coating material on the surface of the skin having biological characteristics. For example, it is a transfer plate (stencil) for attaching the coating material 21 to the surface of the skin having biological characteristics through a plurality of micropores, and the coating material 21 transferred through the plurality of micropores has a pattern similar to the biological characteristics. A plurality of micropores are arranged so as to form a. By arranging the plurality of micropores, the pattern of the stencil 22, that is, the pattern of the pseudo fingerprint is formed. The physical properties required as a suitable coating material for the use of transfer plates (stencils) are similar to those of inks used in silk screens and are as follows.

Viscosity is 1 to several tens of Pa / s (Pascal second): If the viscosity is too high, clogging will occur, and if it is too low, bleeding will occur.

-The film thickness is several μm to 100 μm: If it is thicker than 100 μm, it may not respond normally to the fingerprint sensor. Further, if it is thinner than several μm, the screen ink may not be transferred.

Next, the paint is uniformly applied to the surface of the silicone rubber sheet 23. Next, the stencil 22 having the pseudo-fingerprint pattern is superposed on the paint 21 applied to the surface of the silicone rubber sheet 23. Next, when the finger 24 is placed on the stencil 22 and the stencil 22 is pressed, the pseudo fingerprint is transferred to the finger 24.

FIG. 22 shows a stencil 22 having a pseudo-fingerprint and created by silk screen plate making. The pseudo-fingerprint pattern of the stencil 22 is created by modifying the pattern in which the fingerprint is captured, for example, by a computer program. Then, the stencil 22 is created by, for example, silk-screening a pseudo-fingerprint.

FIG. 23 shows an example of the appearance of the pseudo-fingerprint transferred to the surface of the finger 24. The surface of the finger 24 is not primed with a base layer, and the pseudo-fingerprint is directly transferred to the finger 24. For example, the pseudo-fingerprint pattern does not peel off due to friction or sweating in daily life, but can be peeled off by washing with water using soap or the like.

FIG. 24 shows a flow chart of pseudo-fingerprint production in this embodiment. First, the coating material 21 and the sticking tool 22 are prepared (S010). The coating material 21 is a cream-like or gel-like material having a light scattering property in the visible light region, and for example, a water-soluble acrylic paint mixed with an acrylic solvent can be used. Further, since the coating material 21 is attached to the surface of the skin having biological characteristics, the coating material 21 is required to have quick-drying property and adhesiveness to the skin. The sticking device 22 is a device for sticking the coating material 21 to the surface of the skin having the biological characteristics. For example, a stencil for sticking the paint as the coating material 21 to the surface of the skin having the biological characteristics through a plurality of micropores. 22 can be used. Here, in the stencil 22, a plurality of micropores are arranged so that the coating material 21 transferred through the plurality of micropores forms a pattern similar to the biological characteristics.

Next, the paint 21 is applied to the silicon rubber sheet 23 (S020). Next, the stencil 22 is placed on the paint 21 applied to the silicon rubber sheet 23 (S030). Next, the finger 24 with the fingerprint facing down is pressed onto the stencil 22 on which the pseudo-fingerprint pattern is drawn (S040). Then, the pseudo fingerprint pattern is transferred to the surface of the finger 24 (S050). Here, the pseudo fingerprint pattern is a pattern similar to a fingerprint.

25 and 26 are diagrams (No. 1) and (No. 2) for explaining the disturbing effect on fingerprint detection from photographs. FIG. 25 shows an example using the pattern of FIG. 18, and FIG. 26 shows an example according to this embodiment. The method using the pattern of FIG. 18 is a method of failing to detect a fingerprint by a photograph by superimposing a geometric shape as noise. FIG. 25 (a) is an example of a photographed image, and FIG. 25 (b) is an enlarged view of the image after binarization. According to this method, there is an effect of fragmenting the ridge line by emphasizing the edge and concealing the feature point in the pattern region, which is effective for obstruction. On the other hand, it is necessary to widen the pattern area as a measure against pattern cancellation by image processing. That is, it is preferable to increase the area of the geometric pattern so that the fingerprint detection by the photograph fails.

FIG. 26 shows an example according to this embodiment. By superimposing pseudo-fingerprints as noise, it is a method of recognizing an erroneous fingerprint and interfering with the detection of the fingerprint (the person's original fingerprint). FIG. 26A is an example of a photographed image, and FIG. 26B is an enlarged view of the image after binarization. According to this method, it is possible to prevent pattern cancellation by filtering (understanding the characteristics of the pattern and removing the pattern having the characteristics) by the spatial frequency close to that of a regular fingerprint. That is, by superimposing the same pattern as the original fingerprint, the photographed fingerprint adds false feature points in addition to the correct feature points of the original fingerprint, and is therefore recognized as an erroneous biological feature as a whole. Further, when the pseudo-fingerprint pattern can be estimated like a geometric pattern, for example, the image processing shown in [0061] may minimize the disturbing effect on fingerprint detection. If advanced analytical techniques are used, the characteristics of the pseudo-biological feature pattern may be grasped and the biological feature and the pseudo-biological feature pattern may be separated, that is, the biological characteristic may be estimated. To prevent this, it is better to use a pseudo-biological feature pattern with a close repetition frequency. By doing so, by overlapping the pseudo-biological feature pattern on the biological feature, a new feature point is generated on the original feature point so that the biological feature cannot be recognized, and the biological feature is analyzed. Since it becomes difficult to separate the pseudo-biological feature pattern, it is possible to prevent guessing the biological feature.

The distance between human fingerprints varies depending on the measurement location and is 0.3 to 0.5 mm, with an average of about 0.4 mm. Since the resolution of a standard fingerprint sensor is 500 pixels / inch, when converted to the number of pixels, it is 0.4 x 500 / 25.4 = 7.874 pixels, and the spatial frequency is the reciprocal of 0.127 (1 /). Pixel). Therefore, although it differs depending on the person, the effect can be expected by setting the interval of the pseudo fingerprints within 0.4 mm ± 20%, for example.

27 and 28 are diagrams and diagrams for explaining the transparency (authentication) to the fingerprint sensor. 27 is an example of the capacitive sensor 10A, and FIG. 28 is an example of the optical sensor 10B. 27 (a) is a schematic diagram showing a sensor configuration, and FIG. 27 (b) is a diagram showing an example of a detected fingerprint. The capacitance type sensor 10A maps the difference in capacitance between the contact surface and the air layer (difference between the ridge line and the valley line) on the image. Since the paint 21 is superimposed only on the convex portion (ridge line) of the regular fingerprint (the portion where the gray portion is superimposed), the pseudo fingerprint is always detected as a dark line. Therefore, the image acquired by the capacitance type sensor 10A is almost the same as the normal fingerprint.

FIG. 28 is an example of the optical sensor 10B. FIG. 28 (a) is a schematic diagram showing a sensor configuration, and FIG. 28 (b) is a diagram showing an example of a detected fingerprint. The optical sensor 10B maps the total reflected light at the boundary between the prism 12 and the air layer to the image. Since the step of the pseudo fingerprint is superimposed on the regular fingerprint according to the thickness of the paint (paint) 21, there is a possibility (risk) that the pattern of the pseudo fingerprint is detected. Therefore, in order to reduce the influence of pseudo-fingerprints, it is necessary to study the paint (paint) 21 material and the application method (thinning, etc.).

FIG. 29A is a diagram showing the influence of the mixing ratio of the paint and the solvent on the acquired image by photography. Figures 29A-(d) show photographs of fingers transferred from the same pseudo-fingerprint pattern with different opacity using a prototype fingerprint anti-fingerprint device, and binarized images of them. 29A (e)-(h). The latter enlarges and reduces the photo so that the image resolution is equivalent to 500 ppi, and performs adaptive binarization processing with a kernel size of 11 pixels. When the opacity is 8%, the pseudo-fingerprint pattern cannot be visually recognized, and the pattern noise that appears after binarization is very small. On the other hand, when the opacity is 14% and 39%, the pseudo fingerprint pattern can be visually recognized, and the pattern noise is effectively superimposed on the original fingerprint in the binarized image.

FIG. 29B is a diagram showing the effect of the mixing ratio of the paint and the solvent on the image acquired by the fingerprint sensor. For each sample shown in FIG. 29A, images acquired by a capacitive fingerprint sensor are shown in FIGS. 29B (a)-(d). Since the ink adheres mainly to the convex parts (ridges) of the fingerprint, the distance between the skin and the electrodes changes depending on whether or not the pattern is superimposed on the ridges, and as a result, the fragmentary color on the ridges. Appears as unevenness. Since the recesses (valley lines) of the fingerprint are not affected, the characteristics of the fingerprint are not significantly changed, and there is no problem in performing proper fingerprint authentication.

Images acquired by an optical fingerprint sensor for each of the same samples are shown in FIGS. 29B (e)-(h). Since the image is bright in areas where air is present, such as air bubbles and gaps, and dark in other areas, the contrast between the line and contour of the pseudo-fingerprint pattern is high, and noise appears more prominently than in the capacitive method. The higher the opacity, the higher the degree to which the fingerprint recesses (valley lines) are concealed, and the fingerprint recognition rate tends to decrease in the optical method that is more sensitive to surface irregularities than in the capacitive method.

Tables 6 and 7 are tables showing matching results related to fingerprint authentication. For each sample shown in FIGS. 29A and 29B, a fingerprint matching experiment was performed using a binarized image of the photograph taken and an image acquired by the fingerprint sensor. For each sample, a fingerprint sensor (capacitive method and optical method) and three photographic input images were prepared. Matching was performed 9 times in total, with 3 input images for each of the 3 registered images acquired in advance by the fingerprint scanner. Commercial fingerprint recognition software VeriFinger is used for matching, and when the match score is 48 or more, the match is determined to be a match with a FAR of 0.01%.

For each sample, Table 6 shows the number of matches for 9 matching attempts. In the matching from the captured image, it can be seen that when the opacity is 8%, the match is made in all the trials as in the case without the pseudo fingerprint pattern, and the expected disturbing effect is not obtained. In other cases, the number of matches will be zero, and it can be seen that fingerprint recognition from the photograph taken can be effectively prevented. On the other hand, in the matching with the image acquired by the fingerprint sensor, in most cases, it matches in all the trials, and it can be seen that it does not interfere with the legitimate authentication by the fingerprint sensor. However, in the sample with 39% opacity, the number of matches is reduced by the optical fingerprint sensor, and there is an upper limit to the setting of opacity. For each sample, the maximum match score for 9 matching attempts is shown in Table 7. For the photographs taken, the visibility of the pseudo-fingerprint pattern properly affects the match score. Intuitively, the higher the opacity of the image acquired by the fingerprint sensor, the higher the match score. This is a result of the contrast correction of the fingerprint sensor causing the gradation to be crushed and bleeding, which affects the detection of feature points.

From the above results, it is desirable that the opacity is at least about 15% in order to fail fingerprint recognition from a photograph, and at the same time, the opacity should be at least about 30% in order to succeed in legitimate fingerprint authentication by the fingerprint sensor. Is desirable. That is, it was found that 15% to 30% was a preferable range.

As described above, according to the present embodiment, it is possible to provide a method for preventing voyeurism of a biological feature that normally reacts to the biological feature sensor and makes it impossible to restore the biological feature from the photograph taken.

In Example 6, the application device for attaching the coating material is a skin having biological characteristics by placing the coating material on the tips of a plurality of protrusions and pressing the plurality of protrusions against the surface of the skin having biological characteristics. An example of a transfer plate in which a coating material is attached to the surface of the above will be described.

FIG. 30 shows a flow chart of pseudo-fingerprint production in this embodiment. First, the coating material 21 and the sticking tool 22A (not shown) are prepared (S011). As the coating material 21, for example, a paint obtained by mixing a water-soluble acrylic paint with an acrylic solvent can be used. In the application device 22A (not shown), for example, the coating material 21 is placed on the tips of a plurality of protrusions, and the plurality of protrusions are pressed against the surface of the skin having biological characteristics to apply the coating material to the surface of the skin having biological characteristics. The stamper 22A to be attached can be used. Here, a plurality of protrusions are pressed against the stamper 22A, and the plurality of protrusions are arranged on the transfer 22A. The lower the height of the protrusions, the better it is to draw a finer pseudo-fingerprint pattern, but at least when the protrusions are pressed against the skin and when the paint is placed on the protrusions, the height must be such that they do not adhere to parts other than the protrusions.

Next, the paint 21 is applied to the protrusions of the stamper 22A (S031). Next, the finger 24 with the fingerprint facing downward is pressed against the protrusion of the stamper 22A (S041). Then, the pseudo fingerprint is transferred to the surface of the finger 24 (S050).

The fact that the pseudo-fingerprint is transferred to the surface of the finger 24 is the same as in Example 5, and as in Example 5, it reacts normally to the biological feature sensor, and it is impossible to restore the biological feature from the photograph taken. It is possible to provide a method for preventing voyeurism.

In Example 7, the sticking device for sticking the coating material is a finger cot that sticks the coating material to the surface of the skin having biological characteristics through a plurality of micropores.

FIG. 31 shows a flow chart of pseudo-fingerprint production in this embodiment. First, the coating material 21 and the sticking tool 22B (not shown) are prepared (S012). As the coating material 21, for example, a paint obtained by mixing a water-soluble acrylic paint with an acrylic solvent can be used. As the sticking device 22B, for example, a finger cot 22B that sticks the coating material to the surface of the skin having biological characteristics through a plurality of micropores can be used. Here, in the finger cot 22B, a plurality of micropores are arranged so that the coating material transferred through the plurality of micropores forms a pattern similar to the biological characteristics.

Next, the finger cot 22B is fitted to the finger (S022). Next, the finger fitted with the finger cot 22B is immersed in the paint 21 (S032), and then the finger cot is removed from the finger (S042). Then, the pseudo fingerprint is transferred to the surface of the finger 24 (S050).

The fact that the pseudo-fingerprint is transferred to the surface of the finger 24 is the same as in Example 5, and as in Example 5, it reacts normally to the biological feature sensor, and it is impossible to restore the biological feature from the photograph taken. It is possible to provide a method for preventing voyeurism of biological characteristics.

In Example 8, the application device for attaching the coating material is cured by applying the coating material to the surface of the skin having biological characteristics and then irradiating the coating material on the skin surface with ultraviolet rays through a plurality of micropores. An example of a transfer plate to which a coating material is attached will be described.

FIG. 32 shows a flow chart of pseudo-fingerprint production in this embodiment. First, the coating material 21 and the sticking tool 22C (not shown) are prepared (S013). As the coating material 21, for example, an ultraviolet curable resin can be used. In the affixing device 22C, for example, after applying the coating material 21 to the surface of the skin having biological characteristics, the coating material 21 on the surface of the skin is irradiated with ultraviolet rays through a plurality of micropores to be cured, and the coating material 21 is attached. The attached stencil 22C can be used. Here, in the stencil 22C, a plurality of micropores are arranged so that the coating material cured by ultraviolet rays passing through the plurality of micropores forms a pattern similar to the biological characteristics.

Next, the paint 21 is applied to the finger surface (S023). Next, the stencil 22C is superposed on the applied paint 21 (S033). Next, ultraviolet rays are irradiated through the micropores of the stencil 22C to cure the portion of the coating material 21 that has been irradiated with the ultraviolet rays (S043). Next, when the portion of the coating material 21 that has not been irradiated with ultraviolet rays is washed away, a pseudo fingerprint is transferred to the surface of the finger 24 (S050).

The fact that the pseudo-fingerprint is transferred to the surface of the finger 24 is the same as in Example 5, and as in Example 5, it reacts normally to the biological feature sensor, and it is impossible to restore the biological feature from the photograph taken. It is possible to provide a method for preventing voyeurism of biological characteristics.

In Example 9, an example in which the base layer is used in Example 5 will be described. Inserting the base layer between the pseudo-biological features makes it easier to attach the bio-features. On the other hand, the pattern becomes thicker, which makes it somewhat difficult to authenticate biological characteristics. In Example 9, the base layer corresponds to the base portion 4 of Examples 1 to 4. Further, the light disturbing film corresponds to the disturbing portion 5 of Examples 1 to 4.

FIG. 33 shows a flow chart of pseudo-fingerprint production in this embodiment. First, a base layer material 25 (not shown), a coating material 21, and a sticking tool 22 are prepared (S015). The coating material 21 and the patch 22 are the same as in the fifth embodiment. The base layer material 25 is transparent in the visible light region, and when dissolved in water, it becomes creamy and adheres to the skin to smooth out the unevenness of biological characteristics. For example, a water-soluble acrylic resin having a visible light reflectance of, for example, 4% (a lower value is preferable because of higher transparency) and a relative permittivity of 2.7 to 4.5 can be used. Further, since it is attached to the surface of the skin having biological characteristics, the base layer material 25 is required to have quick-drying property and adhesiveness to the skin.

Next, the base layer material 25 is applied to the finger surface (S018). Subsequent steps (S020) to (S050) are the same as in Example 5.

The fact that the pseudo-fingerprint is transferred to the surface of the finger 24 is the same as in Example 5, and as in Example 5, it reacts normally to the biological feature sensor, and it is impossible to restore the biological feature from the photograph taken. It is possible to provide a method for preventing voyeurism of biological characteristics.

It is also possible to apply the base layer to Examples 6 to 8. Also in these cases, after the step of preparing the base layer material 25 (not shown), the coating material 21, and the sticking tool 22 (S015), the step of applying the base layer material 25 to the finger surface (S018) is performed, and then the step (S018) is performed. In addition, it may be continued to the step after the step of preparing the coating material 21 and the attachment device 22 of Examples 6 to 8. In these cases as well, the pseudo-fingerprint is transferred to the surface of the finger 24 as in Example 5, and as in Example 1, the biological characteristics are normally reacted to the biological characteristic sensor, and the biological characteristics from the photograph taken. It is possible to provide a method for preventing voyeurism of biological features that make it impossible to restore.

In this embodiment, an example in which the sticking device is a tattoo sticker will be described. The coating material is an ink for a tattoo seal or an ink applied to a tattoo seal. The transcription procedure is, for example, as follows. First, prepare a tattoo sticker and ink. Commercially available tattoo stickers can be used and consist of a printed base sheet and an adhesive sheet. As the ink, commercially available inks for printing equipment can be used, and these printing equipments can be used to print on the printing base sheet.

Next, the pseudo fingerprint pattern is printed on the print base sheet. Printing is performed by, for example, a commercially available printing device. The pseudo-fingerprint pattern is a pattern similar to the original fingerprint, which enables authentication by pressing the original fingerprint and prevents voyeurism of the original fingerprint. Here, the similar pattern means a pattern that is similar to the biological feature but does not establish the authentication of the biological feature. Next, the print base sheet on which the pseudo-fingerprint pattern is printed is dried and attached to the adhesive sheet coated with the adhesive. Next, the print base sheet is peeled off from the adhesive sheet, and the print base sheet is attached so that the surface on which the pseudo-fingerprint pattern is printed faces the surface of the finger having the fingerprint.

Next, when the back side of the print base sheet is rubbed against the finger and a cloth or paper soaked in water is applied to the back side, the ink permeates the finger together with the water and the pseudo fingerprint pattern is transferred to the surface of the finger. To. Next, the print base sheet is peeled off from the finger.

The fact that the pseudo-fingerprint is transferred to the surface of the finger 24 is the same as in Example 5, and as in Example 1, it reacts normally to the biological feature sensor, and it is impossible to restore the biological feature from the photograph taken. It is possible to provide a method for preventing voyeurism of biological characteristics.

34 to 36 show an example of pseudo-fingerprint transfer in this embodiment (No. 1 to No. 3). In this embodiment, an example in which a similar pattern to be attached to the surface of a living body using a pasting instrument differs depending on the time of pasting will be described.

In FIG. 34, the sticking instrument has a transfer tape 34 on which a plurality of pseudo-fingerprint patterns are drawn by a plurality of micropores, and a stamper 30 for pressing the pseudo-fingerprint pattern drawn on the transfer tape 34 against the surface of the skin having a fingerprint. Then, the stamper 30 having an ink base 33 that supplies ink to the surface of the skin through the transfer tape 34 on the transfer tape 34 side, and the transfer tape so that the pattern to be transferred among the plurality of pseudo fingerprint patterns comes to the position of the stamper 30. An example in which a pair of take-up reels 31 and 32 for moving the 34 are provided in the box 35A will be described. Since it is provided in the box 35A, it is possible to prevent the ink from drying. The transfer tape 34 is exposed at the position of the stamper 30. The transfer tape 34 is moved so that the pattern to be transferred by the pair of take-up reels 31 and 32 comes to the position of the stamper 30. In this embodiment, the transfer tape 34 having the pseudo-fingerprint pattern formed by the plurality of micropores is pressed against the finger by the stamper 30, and the ink as the coating material is extruded from the micropores to transfer the pseudo-fingerprint pattern to the finger.

FIG. 34 (a) is a diagram showing a state at the time of tape winding on which a pseudo-fingerprint pattern is drawn in the affixing instrument, and FIG. 34 (b) is a diagram showing a state at the time of pseudo-fingerprint transfer of the affixing instrument. In FIG. 34 (a), the tape 34 on which the pseudo fingerprint pattern is drawn is wound on the pre-use tape winding reel 32 before use. The tape 34 is typically flat. A pair of take-up reels 31, 32 is used to move the pattern to be transferred to the position of the stamper 30. The tape 34 is exposed at this position. After use, the tape 34 is wound on the tape take-up reel 31 after use. At the time of winding, the transfer ink base 33 of the stamper 30 is separated from the tape 34. The reason for using a plurality of pseudo-fingerprint patterns is to change the pattern as much as possible to prevent voyeurism as much as possible, for example, as a different pattern at the time of pasting, even if the previous pattern is known. In FIG. 34 (b), when the pattern of the tape 34 is transferred to the finger, the transfer ink base 33 is pressed against the finger with the tape 34 sandwiched by the stamper 30. As a result, the pseudo fingerprint pattern drawn on the tape 34 is transferred to the finger. With this configuration, the transfer tape 34 and the stamper 30 on which a plurality of patterns are formed are used, so that continuous transfer processing becomes possible.

FIG. 35 shows an example (No. 2) of pseudo-fingerprint transfer in this embodiment. In this embodiment, an example of a stamper in which the sticking tool has a protrusion is shown. FIG. 35 (a) shows an example of sealing the transfer tape 34 in a box, and FIG. 35 (b) shows an example of sealing the transfer seal 39 in a bag. In FIG. 35 (a), in order to prevent the ink from drying, the transfer tape 34, the tape winding mechanism (roller-37), and the ink base 33 containing the ink are housed in the sealed box 35B, and the lid is used during use. Open 36 for use. A pseudo fingerprint pattern is formed on the transfer tape 34 by protrusions. When the lid 36 is closed, the ink base 33 comes into close contact with the tape 34, and the ink adheres to the tip of the protrusion of the transfer tape 34. The pattern to be transferred is moved to a position facing the ink table 33 (that is, a position facing the lid 36) using the tape winding mechanism (roller) 37. When the lid 36 is opened and the finger is pressed against the transfer tape 34, the pseudo fingerprint pattern drawn on the transfer tape 34 is transferred to the finger. Since the transfer tape 34, the tape winding mechanism (roller) 37, and the ink base 33 are housed in the sealed box 35B, it is possible to prevent the ink from drying. In FIG. 35 (b), the pseudo-fingerprint pattern has protrusions, and the transfer sheet 39 to which the ink is attached to the tips of the protrusions is sealed in the package (bag) 38. At the time of use, when the transfer sheet 39 is taken out from the package 38 and the finger is pressed against the transfer sheet 39, the pseudo fingerprint pattern is transferred to the finger. Since the transfer sheet 39 to which the ink is attached is sealed in the package (bag) 38, it is possible to prevent the ink from drying. Continuous transfer can also be performed by sequentially changing the transfer sheet 39 and transferring.

FIG. 36 shows an example (No. 3) of pseudo-fingerprint transfer in this embodiment. In this embodiment, an example in which a transfer sticker 43 on which a pseudo-fingerprint pattern is drawn is attached to a finger is shown. FIG. 36 (a) shows a tape winding type (No. 1), FIG. 36 (b) shows a tape winding type (No. 2), and FIG. 36 (c) shows a transfer sticker 43 on which a pseudo fingerprint pattern is drawn. An example of sandwiching and holding (protective sheet 41 and release sheet 42) is shown. In FIG. 36 (a), a plurality of transfer stickers 43 on which a pseudo fingerprint pattern is drawn are attached to the transfer tape 34 to be wound. The pre-use tape take-up reel 32, the post-use tape take-up reel 31, the transfer tape 34, and the take-up timetable 40 are housed in an oval case (box) 35C, and the pre-use tape take-up reel 32 and the post-use tape take-up reel 32 are stored. A transfer sticker depicting one pseudo-fingerprint pattern is exposed between the reels 31. A part of the take-up dial 40 is also exposed on the opposite side of the case (box) 35C, and when the exposed part of the take-up dial 40 is turned, the pre-use tape take-up reel 32 and the post-use tape take-up reel 31 are both in the same direction. The transfer tape 34 is wound up. The transfer tape 34 is moved so that the transfer seal 43 to be transferred by the pair of take-up reels 31 and 32 comes to the exposed position. When a finger is pressed against the exposed pseudo-fingerprint pattern, the transfer sticker 43 on which the pseudo-fingerprint pattern is drawn is peeled off from the transfer tape and attached to the finger. Since the adhesive is adhered to both sides of the seal 43, it is preferable to cover the side to be attached to the finger with a protective sheet and peel off the protective sheet before pressing the finger.

In FIG. 36 (b), the shape of the case (box) 35D is a raindrop type, and the transfer tape 34 is rotated along the shape of the raindrop by using a roller 37 (not shown) and is exposed at the tip of the raindrop. When a finger is pressed against the exposed pseudo-fingerprint pattern, the transfer sticker 43 on which the pseudo-fingerprint pattern is drawn is peeled off from the transfer tape 34 and attached to the finger. In FIG. 36 (c), the transfer sticker 43 on which the pseudo fingerprint pattern is drawn is sandwiched between the protective sheet 41 and the release sheet 42 and held. When the protective sheet 41 is peeled off from the peeling sheet 42, the transfer sticker 43 on which the pseudo-fingerprint pattern is drawn is exposed. When a finger is pressed against the transfer sticker 43, the transfer sticker 43 is peeled off from the release sheet 42 and attached to the finger.

FIG. 37 shows an example of a combination of the carrying case 44 and the separate package. The transfer seal 43 is sandwiched and held between two sheets 41 and 42 of a separate package (the transfer seal 43 is sandwiched and held between the protective sheet 41 and the release sheet 42), and a plurality of separate packages are carried and held in the case 44. Put it in and carry it. The carrying case 44 is convenient because a large number of separate packages can be carried, and the pseudo fingerprint pattern can be changed in a timely manner. By putting the transfer sticker 43 in the carrying case 44, it is possible to prevent the ink adhering to the transfer sticker 43 from drying out.

FIG. 38 shows the carrying case 44 and the separate package separately. FIG. 38 (a) shows the separate package and the transfer seal 43, and FIG. 38 (b) shows the carrying case 44. The right column of FIG. 38 (a) shows the variation of the pattern of the protective sheet 41 (front side) of the separate package. For example, aluminum paper is used for the protective sheet 41. In the middle row, the transfer seal 43 is placed on the release sheet (back surface) 42. For example, vinyl paper is used for the release sheet 42. FIG. 38 (b) shows an example of the carrying case 44. As shown in FIG. 37, a plurality of separate packages sandwiching the transfer seal 43 are carried in a carrying case 44.

FIG. 39 shows a step of taking out the transfer sticker 43 from the separate package and transferring the pseudo fingerprint pattern to the finger. 39 (a) is a step of peeling the protective sheet 41 from the separate package, FIG. 39 (b) is a step of removing the transfer sticker 43 from the separate package, and FIG. 39 (c) is a step of pressing a finger against the transfer seal 43. The process of transferring the pseudo fingerprint pattern to the finger is shown.

FIG. 40 shows an example in which a transfer sticker 43 is attached to a finger and a photograph is taken. FIG. 40 (a) shows a state in which the transfer sticker 43 is attached to the finger and then peeled off from the finger, and FIG. 40 (b) shows a photographed pattern. The pseudo-fingerprint pattern of the transfer sticker 43 strongly appears in the photographed pattern, and the effect of obstructing voyeurism is obtained.

In Example 11, the case where the base layer is not formed on the finger surface has been described, but the base layer which is transparent in the visible light region and covers the biological characteristic region may be formed. That is, Example 11 is a sheet to be attached to the surface of skin having biological characteristics, which is transparent to a visible light region and covers the biological characteristic region on one surface; the base portion and the like. It is formed on the surface of the surface and has a disturbing portion of a predetermined pseudo-biological feature pattern having a light scattering characteristic in the visible light region; it may be a sheet. Inserting a base layer between the finger surface and the pseudo-fingerprint pattern facilitates transfer of the pseudo-fingerprint pattern. For example, the base layer may be formed on the finger surface as described with reference to FIG. 7 (a) before the pattern transfer operation described with reference to FIGS. 34 to 39. Further, in the case of the transfer tape 34, transfer sheet 39 or transfer sticker 43 of FIGS. 35 and 36, a base layer is formed on the pseudo fingerprint pattern, and when a finger is pressed, the base layer is transferred together with the pseudo fingerprint pattern. Will be done.

FIG. 41 shows an example of a pseudo fingerprint pattern. FIG. 41 (a) shows the kernel size k = 3 (about 0.15 mm), FIG. 41 (b) shows the kernel size k = 11 (about 0.5 mm), and FIG. 41 (c) shows the kernel size k = 99 (about 5 mm). ) Is an example. The kernel size is an index showing the range of affected pixels, and the numbers in parentheses are the values converted to millimeters. The width of the line representing the fingerprint increases in the order of FIGS. 41 (a), (b), and (c), and the kernel size also increases. At k = 3, high-frequency noise from the optical sensor is predominant, and at k = 99, color unevenness due to blood flow is predominant. Since the average spacing of human fingerprints is about 7 pixels, it can be inferred that k = 7 is optimal. When the spatial frequency difference between the original fingerprint and the pseudo-fingerprint pattern is large, the influence of the pseudo-fingerprint pattern may be removed by the filter operation. On the other hand, if the spatial frequency of the pseudo-fingerprint pattern is set to the same level as the spatial frequency of the original fingerprint, such a filter operation becomes difficult.

Further, in order to enhance the obstructive effect of the biological feature voyeurism prevention according to the present invention, the following can be mentioned.

(A) Μ-order beads are embedded in a sticker or finger cot having a pseudo-fingerprint pattern. In the μ order, no unevenness appears on the surface of the seal or finger cot. However, when taking a picture, the fingerprint pattern on the surface cannot be taken correctly due to the reflected light from the beads. For this purpose, the beads are required to have a high reflectance, which gives a strong gloss to the captured fingerprint and enhances the disturbing effect. The size of the ridges and valleys of the fingerprint is on the order of 0.1 mm, and the beads are much smaller than that, so they do not affect the authentication by the biometric sensor.

(B) A diffraction grating pattern or a plurality of parallel convex patterns are embedded in a seal or a finger cot. In the case of a diffraction grating, it can be seen only from a specific direction, and in the case of a plurality of parallel convex patterns, it can be seen only from the front. The spatial frequency of the diffraction grating or the spatial frequency of a plurality of parallel convex patterns is considerably smaller than the spatial frequency of the fingerprint, and if it is on the order of μm, it does not affect the authentication by the biometric sensor.

Although the embodiment of the present invention has been described above, the embodiment is limited to the above examples.

However, it is clear that various changes can be made without departing from the spirit of the present invention.

For example, in Examples 1 to 4, the example in which the pattern covers a part of the biological feature has been described, but it may be a monochromatic pattern that covers the whole biological feature. Further, it is assumed that the base portion 4 also has the function of the disturbing portion 5, or that the base portion 4 is made of a mixture of the base portion and the disturbing portion. Further, in Examples 1 to 4, an example in which the base portion is a water-soluble acrylic resin and the disturbing portion is an acrylic paint has been described, but the base portion is transparent in the visible light region and the disturbing portion has light scattering characteristics in the visible light region. These materials may be used as long as they have.

For example, in Examples 5 to 11, the example in which the biological feature is a fingerprint has been described, but the pseudo-palm print / pseudo-venous print can be similarly applied to the palm print / vein print. The pseudo-biological feature may be created by transforming an existing biological feature, or a pattern similar to the biological feature may be created by a computer. Further, in Examples 5 to 11, an example in which the pseudo-biological feature pattern covers a part of the biological feature has been described, but the biological feature may be misidentified by covering the entire biological feature. The coating material is not limited to white, and may be another color such as flesh color as long as it reflects visible light, or may be translucent. Further, the base layer material is not limited to transparent, and may be another color such as flesh color as long as visible light is transmitted, or may be translucent. Further, in Examples 5 to 11, an example in which the coating material is acrylic is described, but if the base layer is transparent in the visible light region and the coating material has light scattering characteristics in the visible light region, other materials are used. May be used. Further, although the example in which the distance that can be taken by the camera is set to 5 m has been described, it may be considered that the distance varies depending on the performance of the camera. In addition, the skin color also changes depending on race and sunburn, so it is considered that there is a range of colors.

The present invention is used to prevent voyeurism of biological features.

1 Biological features Voyeur prevention equipment (fingerprint anti-voyeur equipment)

2 Living body (skin)

3 Biological characteristics (fingerprint)

4 Base part (base layer)

5 Disturbance

10A Capacitive fingerprint sensor

10B optical fingerprint sensor

11 Contact surface

12 prism

13 Fingerprint ridge

14 Fingerprint valley line

15 Light source

16 Image sensor

17 Passivation film for capacitive fingerprint sensor

21 Coating material (paint)

22, 22A, 22D transfer plate (stencil)

22A stamper

22C finger cot

23 Silicone rubber sheet

24 fingers

25 Base layer material

30 Ink pad

31 After use Tape take-up reel

32 Before use Tape take-up reel

33 Ink stand

34 Transfer tape

35A-35D box

36 lid

37 roller

38 packages

39 Transfer sheet

40 take-up dial

41 Protective sheet

42 peeling sheet

43 Transfer sticker

44 Carrying case

Claims (23)

It has light scattering characteristics in the visible light region and has a disturbing part that covers the biological characteristic region;
The disturbing part scatters light in the visible light region on the surface, while enabling biometric authentication by pressing biometric features;
Biological features Voyeur prevention equipment. Further provided with a base portion that is transparent in the visible light region and covers the biological feature region;
The base portion is formed by contacting the biological feature region with a thin film, and the disturbing portion is formed by contacting the base portion with a thin film;
The biological feature voyeur prevention wearing device according to claim 1. The base portion adheres to the living body and does not leave air bubbles during authentication by the contact type biometric sensor;
The biological feature voyeur prevention wearing device according to claim 2. The light scattering characteristic is a characteristic having a reflectance that hinders recognition of the biometric feature by visible light transmitted through the disturbing portion and can acquire the biometric feature that can be biometrically recognized by an optical biometric feature sensor;
The biological feature voyeurism prevention wearing device according to any one of claims 1 to 3. The base portion and the disturbing portion have a refractive index that allows the biometrically recognizable biometric features to be acquired by an optical biometric sensor using an optical prism;
The biological feature voyeurism prevention fitting according to claim 2, claim 3, or claim 4, which cites claim 2 or 3. The base portion and the disturbing portion have a relative permittivity that allows the biometrically identifiable biometric features to be acquired by a capacitive biometric sensor;
The biological feature voyeur prevention wearing device according to claim 2 or 3. With a base material that is transparent in the visible light region and covers the biological characteristic region;
It has a light scattering property in the visible light region and is provided with a disturbing substance that covers biological characteristics;
The biometric feature is a pattern appearing on the surface of the skin that represents a physical feature peculiar to the living body and is used for biometric authentication;
The biometric region is a region of the biometric features from which biometric authentication data is collected;
Biological characteristics Material for manufacturing anti-voyeur equipment. Using a cream-like or gel-like coating material having light-scattering properties in the visible light region, and a sticking device for sticking the coating material to the surface of the skin having biological characteristics,
A light-disturbing film made of the coating material having a predetermined pseudo-biological feature pattern, which enables authentication by pressing the biological feature and prevents voyeurism of the biological feature, is used by the affixing device. The coating material is attached to the surface of the skin having biological characteristics to form;
The pseudo biometric pattern is a pattern that makes biometric authentication by the biometric feature impossible by superimposing it on the biometric feature;
How to prevent voyeurism of biological characteristics. The application device is a transfer plate for attaching the coating material to the surface of the skin having biological characteristics through a plurality of micropores, and the coating material transferred through the plurality of micropores is the pseudo-biological characteristics. The plurality of micropores are arranged in the transfer plate so as to form a pattern;
The method for preventing voyeurism of biological characteristics according to claim 8. In the sticking device, the coating material is placed on the tips of a plurality of protrusions, and the plurality of protrusions are pressed against the surface of the skin having the biological characteristics to attach the coating material to the surface of the skin having the biological characteristics. The plurality of protrusions are arranged on the stamper so that the coating material transferred by pressing the plurality of protrusions forms the pseudo-biological feature pattern;
The method for preventing voyeurism of biological characteristics according to claim 8. The application device is a finger cot that attaches the coating material to the surface of the skin having biological characteristics through a plurality of micropores, and the coating material transferred through the plurality of micropores is the pseudo-biological characteristics. The plurality of micropores are arranged in the finger cot so as to form a pattern;
The method for preventing voyeurism of biological characteristics according to claim 8. In the application device, after applying the coating material to the surface of the skin having the biological characteristics, the coating material is cured by irradiating the coating material on the surface of the skin with ultraviolet rays through a plurality of micropores to attach the coating material. The plurality of micropores are arranged in the transfer plate so that the coating material, which is a transfer plate to be attached and is cured by ultraviolet rays passing through the plurality of micropores, forms the pseudo-biological characteristic pattern;
The method for preventing voyeurism of biological characteristics according to claim 8. The sticking device includes a transfer tape on which a plurality of the pseudo-biological feature patterns are drawn, a stamper for pressing the pseudo-biological feature pattern drawn on the transfer tape against the surface of the skin having the biological characteristics, and a plurality of the above-mentioned. It includes a pair of take-up reels that move the transfer tape so that the pattern to be transferred among the pseudo-biological feature patterns comes to the position of the stamper;
The method for preventing voyeurism of biological characteristics according to claim 8. The pseudo-biological feature pattern attached to the surface of the skin having the biological feature using the sticking device differs from time to time of application;
The method for preventing voyeurism of biological characteristics according to any one of claims 9 to 13. The pseudo-biological feature pattern is a pattern having a spatial frequency that is difficult to separate from the biological feature;
The method for preventing voyeurism of biological characteristics according to any one of claims 9 to 13. Using a cream-like or gel-like coating material having light-scattering properties in the visible light region, and a sticking device for sticking the coating material to the surface of the skin having biological characteristics,
A light-disturbing film made of the coating material having a predetermined pseudo-biological feature pattern, which enables authentication by pressing the biological feature and prevents voyeurism of the biological feature, is used by the affixing device. The coating material is attached to the surface of the skin having biological characteristics to form a biological characteristic voyeur prevention wearing device;
The pseudo biometric pattern is a pattern that makes biometric authentication by the biometric feature impossible by superimposing it on the biometric feature;
Biological characteristics Manufacturing method of anti-voyeur equipment. With cream-like or gel-like coating materials that have light-scattering properties in the visible light region;
It is provided with a sticking device for sticking the coating material on the surface of the skin having biological characteristics;
It is a manufacturing set of biometric voyeurism prevention equipment that prevents voyeurism of biological features;
The affixing device is a light-disturbing film made of the coating material having a predetermined pseudo-biological feature pattern, and is attached with a light-disturbing film that enables authentication by pressing the biological feature and prevents voyeurism of the biological feature. It realizes the method corresponding to any one of claims 9 to 13 for attaching;
A manufacturing set of biological feature voyeur prevention equipment that prevents voyeurism of biological features. By forming a predetermined pseudo-biological feature pattern on the surface of the skin having biological features, it is possible to authenticate by pressing the biological features and prevent voyeurism of the biological features;
The pseudo biometric pattern is a pattern that makes biometric authentication by the biometric feature impossible by superimposing on the biometric feature, and is a pattern having a spatial frequency that is difficult to separate from the biometric feature;
How to prevent voyeurism of biological characteristics. With a coating material capable of forming a predetermined pseudo-biological feature pattern on the surface of the skin having biological features;
A patching device for forming the pseudo-biological feature pattern using the coating material on the surface of the skin having biological features;
The coating material and the patching device refer to the coating material and the patching device according to the method for preventing voyeurism of biological characteristics according to claim 18.
Biological features Manufacturing set of anti-voyeur equipment. A sheet having a sticking function of sticking a cream-like or gel-like coating material having light scattering characteristics in the visible light region to the surface of skin having biological characteristics.
The pasting function is a light-disturbing film made of the coating material having a pseudo-biological feature pattern, and the coating material is a light-disturbing film that enables authentication by pressing the biological feature and prevents voyeurism of the biological feature. Is a function formed by pasting on the surface of the skin having the above-mentioned biological characteristics;
The pseudo biometric pattern is a pattern that makes biometric authentication by the biometric feature impossible by superimposing it on the biometric feature;
A sheet that features that. The sticking function is a transfer plate that sticks the coating material to the surface of the skin having biological characteristics through a plurality of micropores, and the coating material transferred through the plurality of micropores forms the photodisturbant film. The plurality of micropores are arranged in the transfer plate so as to form;
The sheet according to claim 20. The sticking function is for placing the coating material on the tips of a plurality of protrusions, pressing the plurality of protrusions against the surface of the skin having biological characteristics, and sticking the coating material on the surface of the skin having the biological characteristics. The plurality of protrusions are arranged on the transfer plate so that the coating material which is a transfer plate and is transferred by pressing the plurality of protrusions forms the photodisturbing film;
The sheet according to claim 20. A set for manufacturing a biological feature voyeurism prevention device for attaching the light disturbing film to the surface of the skin having the biological feature using the sheet according to any one of claims 20 to 22.
It comprises a stamper for pressing the sheet against the surface of the skin having biocharacteristics and a pair of take-up reels that move the sheet so that the desired pseudobiological feature pattern is at the position of the stamper;
A manufacturing set of biological features anti-voyeur equipment.

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