WO2018066467A1

WO2018066467A1 - Wearable article and method for preventing secret photographing of biometric features

Info

Publication number: WO2018066467A1
Application number: PCT/JP2017/035456
Authority: WO
Inventors: 越前　功; 建夫大金
Original assignee: 大学共同利用機関法人情報・システム研究機構
Priority date: 2016-10-03
Filing date: 2017-09-29
Publication date: 2018-04-12
Also published as: JP7056933B2; JPWO2018066467A1

Abstract

The present invention provides a wearable article 1 for preventing secret photographing of biometric features, provided with: a base part 4 which exhibits transparency in the visible-light range and covers a biometric feature 3 area; and scrambling parts 5 which exhibit a light-scattering characteristic in the visible-light range and cover the biometric feature 3 area. In addition, according to another embodiment, the base part 4 is formed as a thin film in contact with the biometric feature 3 area, and the scrambling parts 5 are formed as thin films in contact with the base part 4. This wearable article 1 for preventing secret photographing of biometric features will respond normally to contact-type biometric feature sensors while making it impossible for the biometric features to be reproduced from a photographed picture.

Description

Bio-feature voyeurism prevention wearing device and voyeurism prevention method

TECHNICAL FIELD The present invention relates to a biometric feature voyeurism prevention mounting device and a voyeurism prevention method. More specifically, the present invention relates to a biometric feature anti-sneak device and a method for preventing anti-voyeurism that react normally with a biometric feature sensor and make it impossible to restore biometric features from a photograph taken.

In modern times, fingerprint authentication is widely used as a personal authentication means in many places such as apartment locks, as well as access to confidential information such as entrance / exit management and computer login. On the other hand, digital cameras having a resolution of tens of millions of pixels are widespread, and there is a concern that fingerprint information that could only be read by a contact-type fingerprint sensor may be remotely captured and stolen. In 2014, a group of German hackers announced that they had successfully captured fingerprints of politicians remotely using commercially available digital cameras. When the fingerprint data is transferred to another person's hand, a fake fingerprint is created from the fingerprint data, thereby making it possible to bypass the fingerprint authentication system.

As an apparatus for preventing fingerprint voyeurism, there has been disclosed an imaging apparatus that outputs a warning sound with a buzzer when the registered photographer's fingerprint information does not match the fingerprint information read by the fingerprint sensor. (See Patent Document 1)

JP 2005-295391 A

Since fingerprints are information unique to a living body, 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. Moreover, the imaging device described in Patent Document 1 uses a fingerprint sensor for personal authentication, and is not intended to make it impossible to restore biometric features from a photographed photo.

SUMMARY OF THE INVENTION An object of the present invention is to provide a biological feature voyeurism prevention wearing device and a voyeurism prevention method that react normally with a contact-type biological feature sensor and make it impossible to restore the biological feature from a photograph taken.

In order to solve the above-described problem, the biometric 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 biometric feature 3 region, for example, as shown in FIG. And a disturbing portion 5 having light scattering characteristics in the visible light region and covering the three biometric features.

Here, the biometric feature is a pattern that represents a physical feature unique to each living body, such as a fingerprint or a palm print, and is used for biometric authentication. In addition, the “biometric feature region” refers to a region of biometric features from which biometric authentication data is collected. As for the fingerprint, for example, an area used for fingerprint printing of the thumb or index finger, for example, the palm side from the first joint to the fingertip side. In addition, the base portion and the disturbance portion are typically formed separately, but may be integrally formed as having both functions. Moreover, it is preferable that the base part 4 covers the whole biometric feature 3 region, and the disturbance part 5 may cover a part of the biometric feature 3 region or the whole.

If comprised like this aspect, it can respond to a contact-type biometric feature sensor normally, and can provide the biometric feature sneak shot prevention mounting tool which makes it impossible to restore | restore a biometric feature from the image | photographed photograph.

In addition, the biometric feature voyeurism prevention mounting device 1 according to the second aspect of the present invention is, in the first aspect, for example, as shown in FIG. The disturbance part 5 is formed in contact with the base part 4 as a thin film.

If comprised in this way, since the disturbance part 5 will be formed in contact with the base part 4 after forming the base part 4 in biometric feature 3 area | region, it will be easy to manufacture a biometric feature voyeurism prevention mounting tool.

In addition, the biometric feature voyeurism prevention mounting device 1 according to the third aspect of the present invention is the first aspect or the second aspect, wherein the base portion 4 is in close contact with the living body 2 during authentication by the contact-type biometric feature sensor. Do not leave bubbles.

Here, “at the time of authentication by the contact-type biometric feature sensor, it is in close contact with the living body 2 and bubbles do not remain” means that the convex portion of the biometric feature 3 when the living organism 2 contacts an object (contact-type biometric feature sensor). This means that the material (base portion 4) contacts without any leakage, and no bubbles other than the bubbles derived from the concave portion of the biological feature 3 remain between the living body 2 and the material (base portion 4).

With this configuration, bubbles are not left at the time of authentication by the contact-type biometric feature sensor, so that clear biometric features can be collected.

In addition, in the biological feature voyeurism 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 disturbance unit 5. This is a characteristic that has a reflectivity that does not hinder the transmission of light from the light source of the optical biometric sensor 10B.

Here, the “reflectance to the extent that the recognition of the biological feature region by the visible light transmitted through the disturbance part and the transmission of the light from the light source of the optical biological feature sensor is not prevented” is defined as visible This is because when the light transmittance is high, the biological feature 3 is recognized by the camera, and when 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%. .

When configured in this way, the base unit 4 and the disturbance unit responding normally to the bio-optical bio-feature sensor and having an appropriate reflectance to make it impossible to restore the bio-feature from a photograph taken with visible light. 5 can be realized.

In addition, in the biological feature voyeurism prevention mounting 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 disturbance portion 5 are the optical prism 12 of the optical biological feature sensor 10B. The refractive index is such that it does not change the refraction characteristics.

Here, the “refractive index that does not change the refractive characteristics of the optical prism 12 of the optical biometric sensor 10B” means that the optical path of the measurement light is different from the refractive index of the optical glass used for the optical prism 12 This is because an influence such as change occurs. The refractive index of the acrylic resin used for the base part 4 is 1.49, for example, and the refractive index of zinc oxide used for the disturbance part 5 is 2.0, for example. 1 to 5 is preferable, and 1 to 3 is more preferable.

With this configuration, the base unit 4 and the disturbance unit have an appropriate refractive index that reacts normally with the bio-optical biometric sensor and makes it impossible to restore the biometric feature from a photograph taken with visible light. 5 can be realized.

In addition, in the biometric feature voyeurism prevention wearing device 1 according to the sixth aspect of the present invention, the base portion 4 and the disturbing portion 5 are the static ones by the capacitive biometric feature sensor 10A in any one of the first to fifth aspects. It has a relative dielectric constant that does not interfere with the measurement of capacitance.

Here, the “relative permittivity that does not interfere with the measurement of the electrostatic capacity by the capacitive biometric sensor 10A” means that the electrostatic capacity is different from the relative permittivity of silicon used for coating the sensor. This is because an influence such as change occurs. 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 dielectric constant 2.4, preferably 1-7, more preferably 1-5.

With this configuration, the base unit 4 and the disturbance unit having a relative dielectric constant that reacts normally with the optical biometric sensor and makes it impossible to restore the biometric feature from a photograph taken with visible light. 5 can be realized.

Further, the biometric feature voyeurism prevention wearing device manufacturing material in the seventh aspect of the present invention is transparent in the visible light region, has a base material covering the biometric feature 3 region, and has light scattering characteristics in the visible light region, A disturbing substance covering the biometric feature 3.

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

In order to solve the above-mentioned problem, the biological feature sneak shot prevention method according to the eighth aspect of the present invention is a cream-like or gel-like application having light scattering characteristics in the visible light region, for example, as shown in FIGS. A step of preparing a material 21 and an application tool 22 for attaching the application material 21 to the surface of the skin having biological characteristics (S010), and an application having a pattern similar to the biological characteristics using the application tool 22 A light disturbing film made of material 21, comprising a step (S020 to S050) of attaching a light disturbing film that enables authentication by pressing biometric features and prevents voyeurism of biometric features, A pattern that is similar to a biometric feature but is not authenticated for the biometric feature.

Here, the biometric feature is a pattern that represents a physical feature unique to each living body, such as a fingerprint or a palm print, and is used for biometric authentication. The application tool 22 can transfer a pattern similar to a biological feature to the surface of the skin having a biological feature such as a finger. For example, a transfer plate (stencil) that applies the coating material to the surface of the skin having biological characteristics through a plurality of micropores, or a stamper that presses a plurality of protrusions to bond the coating material to the surface of the skin having biological characteristics. May be. The “micropore” refers to a hole having a size suitable for transferring a biological feature such as a fingerprint, for example, a hole having a size of 10 μm to 1 mm. In addition, it is difficult to recognize biometric features by overlaying simulated biometric feature patterns. However, using advanced analysis technology, biometric features and pseudo-biological feature patterns can be separated, that is, biometric features are estimated. There is a fear. In order to prevent this, it is preferable to use a pseudo-biological feature pattern having a similar repetition frequency. Further, “the biometric feature authentication is not established” means that the biometric feature authentication is not established in a general authentication device.

In this way, by convolution of the biometric feature pattern with the biometric feature, a new feature point is generated at the original feature point so that the biometric feature cannot be recognized. Since it becomes difficult to separate the pseudo biometric feature pattern, it is possible to prevent the original biometric feature from being estimated.

When configured in this manner, it is possible to provide a method for preventing voyeurism of a biometric feature that reacts normally with the

biometric feature sensors

10A and 10B and makes it impossible to restore the biometric feature from the photographed photograph. .

Moreover, as shown in FIG. 21, for example, the method for preventing the sneak shot of the biometric feature according to the ninth aspect of the present invention is that the sticking device 22A has the biometric feature through a plurality of micropores. A transfer plate 22 that affixes the coating material 21 to the surface of the skin, and the transfer material 22 transferred through the plurality of micro holes forms a plurality of microscopic patterns on the transfer plate 22 so as to form a pattern similar to a biological feature. A hole is arranged.

Here, the micropore is not limited to a dot shape, but may be a line segment shape. It is only necessary to form a pattern similar to the biometric feature on the surface of the skin having the biometric feature.

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

In addition, in the biometric feature sneak shot prevention method according to the tenth aspect of the present invention, in the eighth aspect, the affixing device has an application material 21 placed on the tips of a plurality of protrusions on the surface of the skin having biological features. A stamper 22A that presses a plurality of protrusions to affix the coating material 21 to the surface of the skin having biological features, and the coating material 21 transferred by pressing the plurality of protrusions forms a pattern similar to the biological features. 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 is only necessary to form a pattern similar to the biometric feature on the surface of the skin having the biometric feature.

With this configuration, the tip of the protrusion is applied and the coating material 21 is attached to the surface of the skin having biological characteristics. Therefore, if the arrangement of the protrusions is similar to the biological characteristics, a pattern similar to the biological characteristics is formed. it can.

According to an eleventh aspect of the present invention, in the eighth aspect of the method for preventing sneak shots of biological features, the application tool attaches the coating material 21 to the surface of the skin having biological features through a plurality of micropores. The finger sac 22B is attached to the finger sac 22B so that the coating material 21 transferred through the plurality of micro holes forms a pattern similar to the biometric feature.

Here, typically, a finger with a finger sack 22B is dipped in the coating solution, and the coating material 21 is affixed to the surface of the skin having biological characteristics.

If comprised in this way, since the application | coating material 21 is affixed on the surface of the skin which has a biometric feature through a micropore, if the arrangement | positioning of a micropore is made into a pattern similar to a biometric feature, a pattern similar to a biometric feature can be formed.

The biometric feature sneak shot according to the twelfth aspect of the present invention is the method according to the eighth aspect, wherein the application tool applies the application material 21 to the surface of the skin having biological features, It is a transfer plate 22C (not shown) for applying the coating material 21 by irradiating the coating material 21 on the surface of the skin by irradiating ultraviolet rays through the micropores, and the coating material curable by the ultraviolet rays passing through the plurality of micropores is a biological feature. A plurality of micro holes are arranged in the transfer plate 22C so as to form a pattern similar to the above.

If comprised in this way, since the application | coating material 21 is affixed on the surface of the skin which has a biological feature by ultraviolet irradiation, if the arrangement | positioning of a micropore is made into a pattern similar to a biological feature, a pattern similar to a biological feature can be formed. Moreover, the part which is not irradiated with ultraviolet rays can be removed by washing with water, for example.

According to a thirteenth aspect of the present invention, in the eighth aspect of the method for preventing sneak shots of biological features, the sticking device is drawn on the transfer tape 34 having a plurality of similar patterns and the transfer tape 34. A stamper for pressing the similar pattern on the surface of the skin having a living body pattern, and a pair of windings for moving the transfer tape 34 so that the pattern to be transferred is located at the stamper position among the plurality of similar patterns With reel.

If comprised in this way, since the pattern of the transfer tape 34 on which the several similar pattern was drawn can be transferred to a finger one by one, the similar pattern affixed on the biological body surface using the sticking instrument 22 is applied every time. Can be different. In order to transfer a similar pattern drawn on the transfer tape 34 to the surface of the skin having a living body 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. Thus, it can be realized by forming with a plurality of protrusions.

In addition, in the method for preventing the sneak shot of the biometric feature according to the fourteenth aspect of the present invention, in any of the ninth to thirteenth aspects, the similar pattern that is attached to the surface of the living body using the application tool 22 is It depends on the pasting time.

If comprised in this way, since the similar pattern affixed on the biological body surface will differ for every affixing, it will become difficult for the person who takes a voyeur to guess a pattern.

Moreover, the method for preventing the sneak shot of the biometric feature according to the fifteenth aspect of the present invention is similar to the biometric feature in any of the ninth to thirteenth aspects as shown in FIG. 33, for example. It is a pattern having a spatial frequency.

With this configuration, since the spatial frequency close to the biometric feature is used for the pseudo-fingerprint, by superimposing the pattern on the original fingerprint, in addition to the correct feature point of the original fingerprint, Therefore, it is recognized as an incorrect biometric feature as a whole, and the biometric feature is not authenticated. Furthermore, since a spatial frequency close to a biometric feature is used for the pseudo fingerprint, it becomes very difficult to separate the original fingerprint from the pseudo fingerprint, and the original fingerprint cannot be estimated.

In order to solve the above-mentioned problem, the manufacturing method of the biological feature sneak shot prevention wearing device according to the sixteenth aspect of the present invention is, for example, as shown in FIG. 21 and FIG. A step (S010) of preparing a sticking device 22 for sticking the coating material 21 to the surface of the skin having a gel-like coating material and biological features (S010), and using the sticking device 22, a pattern similar to the biological features is prepared. And a step (S020 to S050) of attaching a light disturbing film made of a coating material 21 having a light disturbing film that can be authenticated by pressing a biometric feature and preventing a sneak shot of the biometric feature. Refers to a pattern that is similar to a biometric feature but is not authenticated for the biometric feature.

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

In order to solve the above problems, a manufacturing set of a biometric feature anti-sneak device for preventing voyeurism of biometric features 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. A bio-characteristic voyeurism-preventing wearing device for preventing voyeurism of a biometric feature, comprising a cream-like or gel-like coating material 21 having an adhesive and a sticking device 22 for attaching the coating material 21 to the surface of the skin having biometric features The sticking device 22 is a light disturbing film made of the coating material 21 having a pattern similar to the biometric feature, which enables authentication by pressing the biometric feature and prevents the sneak shot of the biometric feature. It is for attaching a light disturbing film, and corresponds to any one of the ninth to thirteenth items.

When configured as in this aspect, a

biometric feature sensor

10A, 10B responds normally and provides a thin film manufacturing set that prevents voyeurism of a biometric feature that makes it impossible to restore the biometric feature from a photograph taken. be able to.

Further, in the eighteenth aspect of the present invention, the manufacturing set of the biometric feature voyeurism prevention mounting tool for preventing voyeurism of the biometric feature is the seventeenth aspect, for example, as shown in FIG. 34 to FIG. A transfer tape 34 depicting a plurality of similar patterns, a stamper for pressing the similar pattern drawn on the transfer tape 34 against the surface of the biological pattern, and a pattern to be transferred among the plurality of similar patterns is the position of the stamper. And a pair of take-up

reels

31 and 32 for moving the transfer tape 34 so as to come to the center.

If comprised in this way, since the pattern of the transfer tape 34 on which the several similar pattern was drawn can be transferred to a finger one by one, the similar pattern affixed on the biological body surface using the sticking instrument 22 is applied every time. Can be different.

)

Further, the method for preventing the sneak shot of the biometric feature according to the nineteenth aspect of the present invention enables authentication by pressing the biometric feature by forming a pattern similar to the biometric feature on the surface of the skin having the biometric feature, A method of preventing voyeurization of a biometric feature, where a similar pattern refers to a pattern that is similar to a biometric feature but is not authenticated, and has a spatial frequency close to that of the biometric feature.

With this configuration, since the spatial frequency close to the biometric feature is used for the pseudo fingerprint, it becomes very difficult to separate the original fingerprint from the pseudo fingerprint, and the original fingerprint cannot be estimated.

Moreover, the manufacturing set of the biometric feature voyeurism prevention wearing tool for preventing voyeurism of the biometric feature in the twentieth aspect of the present invention includes an application material capable of forming a pattern similar to the biometric feature on the surface of the skin having the biometric feature, An application device for forming a pattern similar to the biometric feature on the surface of the skin having biometric features using the application material, and the application material and the application device prevent the voyeurism of the biometric feature in the nineteenth aspect It refers to the coating material and sticking device described in the method.

With this configuration, since the spatial frequency close to the biometric feature is used for the pseudo fingerprint, it becomes very difficult to separate the original fingerprint from the pseudo fingerprint, and the original fingerprint cannot be estimated.

ADVANTAGE OF THE INVENTION According to this invention, it can respond to a contact-type biometric feature sensor normally, and can provide the biometric feature voyeurism prevention mounting tool and voyeurism prevention method which make it impossible to restore | restore a biometric feature from the image | photographed photograph.

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 with the fingerprint sensor. It is a figure for demonstrating a minutia matching system. It is a figure which shows the example of a picked-up image and an adaptive threshold value process. It is a figure which shows the example of the fingerprint image according to photographing distance. It is a figure which shows the structural example of the fingerprint voyeurism prevention mounting tool 1 in Example 1. FIG. It is a figure which shows the example of the manufacturing method of the fingerprint voyeurism prevention mounting tool 1 in Example 1. FIG. It is a figure which shows the result of having apply | coated the pattern directly on the fingerprint surface. It is a figure which shows the influence with respect to the fingerprint sensor of a sealing material. It is a figure which shows the influence with respect to the fingerprint sensor of a film thickness. It is a figure for demonstrating the permeability | transmittance of the optical sensor with respect to various materials. It is a figure which shows the example of the sample for pattern examination. 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 the noise with respect to a fingerprint image. It is a figure for demonstrating the influence of the dot size with respect to a fingerprint image. It is a figure for demonstrating the influence of the dot arrangement | sequence with respect to 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 according to photographing distance. It is a figure which shows the average match score according to photographing distance. FIG. 6 is a diagram illustrating a procedure for producing a pseudo fingerprint in the first embodiment. It is a figure which shows the example of the stencil which has a pseudo fingerprint and was created by silk screen platemaking. It is a figure which shows the example of the external appearance of the pseudo fingerprint transferred on the surface of the finger. It is a flowchart of pseudo fingerprint production in Example 1. It is FIG. (1) for demonstrating the disturbance effect with respect to the fingerprint detection from a photograph. It is FIG. (2) for demonstrating the obstruction effect with respect to 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 property) with respect to the optical fingerprint sensor. It is a figure which shows the influence on the acquired image by the picked-up image by the mixing ratio of a coating material and a solvent. It is a figure which shows the influence on the acquisition image by a fingerprint sensor by the mixing ratio of a coating material and a solvent. FIG. 10 is a flowchart of pseudo-fingerprint production in Example 2. FIG. 10 is a flowchart of pseudo-fingerprint production in Example 3. It is a flowchart of pseudo fingerprint production in Example 4. It is a flowchart of pseudo fingerprint production in Example 5. It is FIG. (1) which shows the example of the pseudo fingerprint transfer in the present Example 10. It is FIG. (2) which shows the example of the pseudo fingerprint transfer in the present Example 10. It is FIG. (3) which shows the example of the pseudo fingerprint transfer in the present 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 a carrying case and a separate package separately. It is a figure which takes out the transfer seal | sticker from a separate package, and shows the process of transcribe | transferring a pseudo fingerprint pattern to a finger | toe. It is a figure which shows the example which sticks a transfer seal | sticker on a finger | toe and photographs. It is a figure which shows the example of a pseudo fingerprint pattern.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

[Fingerprint sensor]

FIG. 1 is a diagram for explaining the principle of a fingerprint sensor. FIG. 1A shows a capacitive fingerprint sensor, and FIG. 1B shows an optical fingerprint sensor. These are currently widely used fingerprint sensors. The capacitive fingerprint sensor 10 </ b> A measures a potential difference that changes according to the distance between the contact surface 11 and the skin 2 and maps it to the luminance of the pixel. On the other hand, the optical fingerprint sensor 10B irradiates the contact surface 11 with the light emitted 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 luminance of the pixel. .

FIG. 2 shows an example of a fingerprint image acquired by the fingerprint sensor. 2A shows the fingerprint 3 obtained by the capacitive method, and FIG. 2B shows the fingerprint 3 obtained by the optical method. In any case, the luminance distribution is minimum at the ridge 13 of the fingerprint 3 and maximum at the valley 14 (see FIG. 1), so that the fine unevenness of the fingerprint can be mapped with high contrast close to binarization. In FIG. 1 (a), the capacitance between the contact surface 11 and the valley 14 _{C air,} and the capacitance of the passivation film (silicon oxide film) 17 of the sensor surface and _{C ox,} the capacitance at ridge 13 _{C ox,} The potential difference is V _ridge , 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 10 </ b> A detects a difference in capacitance between a finger and an electrode. Materials such as rubber, plastic, and silicon that can be employed as the material for the thin film used in the biometric feature sneak shot mounting tool 1 in this embodiment have a relative dielectric constant of about 2.0 to 5.0. On the other hand, the relative dielectric constant of air is about 1.0, and the difference in capacitance between the case where the detection pixel is through air (the valley line) and the case where the detection pixel is not (the ridge line) is clear. The use of does not interfere with the distinction between ridges and valleys. The optical fingerprint sensor 10B detects a difference in 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 the ridge 13 is incident on the inside of the skin, 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, light is transmitted through the thin film and does not hinder the distinction between the ridge 13 and the valley 14.

[Acquisition of fingerprints from captured images]

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

FIG. 4 shows an example of a captured image and adaptive threshold processing. 4A shows a photographed image (fingerprint image), and FIG. 4B shows a photographed image (fingerprint image) after adaptive threshold processing. A fingerprint image taken by a digital camera is an image obtained by sampling a shadow created by minute irregularities of a fingerprint by ambient light using an optical sensor (camera image sensor). From the viewpoint of obtaining fingerprint data, it is inferior to a contact fingerprint sensor.

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

Therefore, it is difficult to directly restore the fingerprint from the captured fingerprint image. However, adaptive thresholding can be used to effectively reduce global shading due to ambient light and minute noise below the ridge interval. Can be removed.

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

FIG. 5 shows an example of a fingerprint image for each shooting distance. FIG. 5A is a fingerprint image when the shooting distance is 1.5 m, FIG. 5B is a shooting distance of 3 m, and FIG. Table 1 shows the estimation results of the ridge interval by photographing distance. Two ridges can be distinguished if the distance between the ridges is horizontal or vertical, 2 pixels, and if the angle is 45 degrees, it can be distinguished by 2.82 pixels. It can be said that a fingerprint may be detected from the image.

In the present embodiment, a finger mounting tool for preventing fingerprint voyeurism will be described. The fingerprint anti-camera device 1 in this embodiment has a transparent base portion 4 applied to the finger surface and an opaque disturbance portion 5 printed on the surface of the base portion 4.

[Biological features voyeurism 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 anti-camera device 1 and FIG. 6B is a diagram illustrating a configuration example of the fingerprint anti-camera device 1. The fingerprint anti-camera device 1 has a transparent base portion 4 applied to the finger surface and an opaque disturbance portion 5 printed on the surface of the base portion 4. The disturbance part 5 is patterned. The base part 4 is in close contact with the skin 2 to smooth out the unevenness of the fingerprint 3, and the opaque disturbance part 5 obstructs the details of the fingerprint 3, thereby hindering detection of feature points.

In FIG. 6B, the base portion 4 covers the irregularities on the surface of the skin 2 and makes the surface flat. The water-soluble acrylic resin as the material of the base part 4 becomes creamy when dissolved in water, so that when applied to the finger surface, the unevenness of the surface of the skin 2 can be covered and the surface can be leveled and flattened. A pattern of the disturbance portion 5 is formed on the flattened surface. When the base portion 4 comes into contact with the ridge 13 of the fingerprint 3 without fail, an air layer is formed at the valley line 14. This air layer is necessary for the fingerprint sensor to distinguish between the fingerprint ridges 13 and valleys 14 (see FIG. 1). On the other hand, if extra bubbles other than the valley line 14 enter between the skin and the base portion 4, the whole becomes white and the ridge 13 and the valley line 14 cannot be distinguished (see FIG. 9).

The biometric feature voyeurism prevention wearing device 1 includes a base portion 4 that is transparent in the visible light region and covers the biometric feature 3 region, and a disturbing portion 5 that has light scattering characteristics in the visible light region and covers the biometric feature 3 region. Is provided. Preferably, the base portion 4 is a thin film that is formed in contact with the biometric feature 3 region, and the disturbing portion 5 is a thin film that is formed in contact with the base portion 4. Moreover, it is preferable that the base part 4 covers the whole biometric feature 3 region, and the disturbance part 5 may cover a part of the biometric feature 3 region or the whole.

FIG. 7 is a diagram illustrating an example of a method of manufacturing the fingerprint voyeurism prevention wearing tool 1 in the first embodiment. FIG. 7A shows a base material application process, FIG. 7B shows a disturbance part material application process, and FIG. 7C shows a disturbance part transfer process. First, a water-soluble acrylic resin as a base material (base material) is applied to the finger surface with a brush. Next, it is soaked in a cosmetic puff with an acrylic paint (dissolving material of the zinc resin in an acrylic resin solvent) as a disturbing substance (the material of the disturbing part). Then, the pattern 4 is transferred to the fingertip using a stencil sheet in which the pattern 4 for nail art is drawn (drilled).

Since the acrylic paint is compatible with the acrylic resin, the pattern can be easily transferred. FIG. 6A is an appearance of the fingerprint anti-camera device 1. The pattern is transferred to the fingertip. The pattern is a repetitive pattern and is suitable for covering many feature points of the fingerprint.

The conditions of the fingerprint voyeurism prevention wearing tool 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 a photograph taken and a photograph subjected to arbitrary image processing after photographing.

In addition, the material for manufacturing the fingerprint anti-camera device 1 in Example 1 is transparent in the visible light region, has a base material that covers the three biometric features, and has light scattering characteristics in the visible light region. A disturbing substance covering feature 3.

Here, the characteristics of the base part 4 and the disturbance part 5 will be described.

The disturbance unit 5 is required to have a reflectivity that prevents recognition of the biometric feature region by the transmitted visible light and does not prevent transmission of the light source of the optical biometric feature sensor. This is because if the visible light transmittance 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 unit 4 and the disturbance unit 5 are required to have a refractive index that does not change the refractive characteristics of the optical prism 12 of the optical biometric sensor 10B. This is because if the optical glass used for the optical prism 12 deviates from the refractive index of the optical glass, the optical path of the measuring light is changed. The refractive index of the acrylic resin used for the base part 4 is 1.49, for example, and the refractive index of zinc oxide used for the disturbance part 5 is 2.0, for example. 1 to 5 is preferable, and 1 to 3 is more preferable.

The base portion 4 and the disturbance portion are required to have a relative dielectric constant that does not interfere with the measurement of the capacitance by the capacitance type biometric feature sensor 10A. This is because if the dielectric constant of silicon used for the coating of the sensor deviates, an influence such as a change in capacitance occurs. 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 difference from the relative

dielectric constants

2 and 4, 1.7 to 7 is preferable, and 2 to 5 is more preferable. Further, it is preferable that the base unit 4 is in close contact with the living body and does not leave bubbles during authentication by the contact-type biometric feature sensor. Further, the base part 4 can be deformed following the movement of the living body 2, that is, flattened along the contact surface when the living body comes into contact with an object, and becomes the shape of the living body when not in contact. It is preferable that no wrinkles or cracks occur that obstruct the operation.

[Base part]

FIG. 8 shows the result of applying the pattern directly to the fingerprint surface. FIG. 8A is an external view, and FIG. 8B is a fingerprint image. The base part 4 is used to level the unevenness of the ridges and valleys of the fingerprint and flatten the pattern to be printed on the surface. When the pattern was applied directly on the surface of the fingerprint 3, the ink soaked into the valley of the fingerprint, and the fingerprint was emphasized.

FIG. 9 shows the influence of the seal material (the material of the base portion 4) on the fingerprint sensor. FIG. 9A is an external view, and FIG. 9B is a fingerprint image. The base part 4 must adhere to the finger surface. If a gap or a bubble other than a bubble derived from the concave portion of the biometric feature 3 is generated between the finger and the finger, the portion of the fingerprint 3 does not touch the contact surface of the fingerprint sensor, and the read image is lost. This is why it is difficult to achieve with a simple seal.

FIG. 10 shows the influence of the film thickness on the fingerprint sensor. FIG. 10A is a photographed image (three types of thin, middle and thick) by the capacitive sensor 10A (see FIG. 1), and FIG. 10B is a photographed image by the optical sensor 10B (see FIG. 1). Thin, medium, and thick). The thickness of the base part 4 affects the trade-off relationship between the recognition rate of the fingerprint sensor and the obstruction effect on the photograph. If the base portion 4 is too thick, the electrostatic capacitance fingerprint sensor blurs the image and blurs the details. In an optical fingerprint sensor, a bubble-like defect occurs. On the other hand, when the base part 4 is too thin, the unevenness of the fingerprint cannot be leveled completely. There is a possibility of creating shadows in the pattern.

FIG. 11 is a diagram for explaining the transparency of the optical sensor with respect to various materials. 11 (a) is water, FIG. 11 (b) is tissue paper, FIG. 11 (c) is plastic, FIG. 11 (d) is PET (polyethylene terephthalate) (0.2 mm thickness), FIG. 11 (e). ) Is an example of PET (0.5 mm thickness), and FIG. 11F is an example of PET (0.7 mm thickness). In FIGS. 11A to 11C, a material is present at a part of the fingertip. The total reflection condition breaks down due to the presence of moisture, resulting in dark lines. In addition, total reflection occurs due to the air layer, resulting in a bright line. In addition, when the material is not in close contact with the contact surface, the air layer causes image obscuration and white stripes. In FIGS. 11D to 11F, the thickness is changed using 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 a pattern is superimposed on the surface of the fingertip, a thin film is interposed between the contact surface of the fingerprint sensor and the finger. The presence of this thin film should not interfere with the determination of ridges and valleys by the fingerprint sensor.

FIG. 12 shows an example of a pattern examination sample. 12A shows a sample painted with light gray, FIG. 12B shows a sample painted with the average color of the skin, and FIG. 12C shows a sample painted with the surrounding color. In each of FIGS. 12A to 12C, the left is a photographed image, and the right is an image after adaptive threshold processing. The design of the pattern to be printed on the surface must be designed to take into account its direct impact on feature point detection and to be resistant to any image processing. Therefore, we examined the optimum pattern density by simulation of superimposing a dot pattern of variable size on the fingerprint image and matching with the template by the fingerprint sensor. The dot density was 10 lines, 20 lines, and 40 lines (the number of dots per inch), and the dot size was adjusted so that the pattern coverage was 20%, 40%, and 60%. In addition, three types of painting methods were set for the same pattern (see FIGS. 12A to 12C), and the difference in match score was compared.

FIG. 13 is a diagram for explaining the influence of the fill color. FIG. 13A shows a sample painted with white, and FIG. 13B shows the result painted with a color close to the skin. In both FIG. 13A and FIG. 13B, the left is an external view, and the right is an image after adaptive threshold processing. The printed pattern must be resistant to not only the photographed photo but also any image processing using it. The effect of noise on fingerprint recognition is minimized when the pattern brightness is the same as the skin color. In FIG. 13B, it can be seen that the edge of the pattern is clearly weakened and the pattern itself has disappeared in part.

FIG. 14 shows an example of the matching result of the sample pattern. FIG. 14A shows a sample painted with light gray, FIG. 14B shows a sample painted with the average color of the skin, and FIG. 14C shows a sample painted with the surrounding color. The dot density was 10 lines, 20 lines, and 40 lines (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 a template image acquired in advance by a fingerprint sensor is performed, and a match score of 48 or more is regarded as a match. This numerical value is a criterion for determining the same fingerprint at FAR (acceptance rate of others: probability of misrecognizing others as the principal) 0.01%. If feature point extraction fails, the match score is set to zero.

With light gray, voyeurism can be effectively blocked in all cases, but when the skin is painted with the average color or surrounding colors, there are many cases where the blocking fails. If the coverage is low, the interference will fail in most cases, and even with the same coverage, the greater the number of lines (ie, 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 essential.

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

Table 2 shows the determination result of the size requirement, and Table 3 shows the determination result of the density requirement. There are three types of dot patterns that simultaneously satisfy these two requirements: 10 lines 40%, 10 lines 60%, and 20 lines 60%. This generally agrees with the matching result of 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 (kernel size used for the Gaussian filter) (see FIG. 17).

FIG. 15 is a diagram for explaining the effect of noise on a fingerprint image. FIG. 15A shows a case where the dot is darker than the skin, FIG. 15B shows a case where the dot and the skin have the same brightness, and FIG. 15C shows a case where the dot is brighter than the skin. In both cases, the dot pattern is superimposed on the fingerprint image, and adaptive threshold processing is performed. This dot pattern (filter) functions as a kind of edge detector and enhances the contrast gap of the image.

This dot pattern (noise) has the following three effects on feature point detection.

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

(2) The original feature point disappears. When there is a feature point around the dot, the ridge is divided or connected to the two rings described above, so that a 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 as k√2 / 2.

(3) 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 if 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 a dot is on one ridge, and FIG. 16B shows a case where a dot is on two ridges. When a dot is on one ridge, it is away from other ridges, and has no effect on feature point detection. When the dot is on two or more ridges, ambiguity occurs in the connection of the ridges, so that a positive interference effect on the detection of feature points can be expected. Therefore, in order to produce a disturbing effect, r> h is a necessary condition where the dot radius is r and the ridge interval is h.

FIG. 17 is a diagram for explaining the influence of dot arrangement on fingerprint detection for a fingerprint image. The effect of noise extends over an area wider than the dot radius. In the minutia matching method, even a part of feature points can be accurately matched, so that it is necessary to influence the noise over the entire image.

If the dot density is 10 lines, 20 lines, and 40 lines (number of dots per inch), the dot radius is r, the filter kernel size is k, and the dot spacing is d, the noise influence 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 a prototype used for evaluation. FIG. 18A is an external view, and FIG. 18B is a design pattern. Based on the examination so far, a prototype of biometric jamming prevention device (BiometricJamer) was created and its effectiveness was evaluated for four subjects.

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

(1) The surface of the finger (right thumb) not wearing the prototype is scanned with a fingerprint sensor and registered as a template.

(2) Photograph the same finger using a digital camera and perform matching with template (1).

(3) Wear a prototype on the same finger, shoot using a digital camera, and match with template (1).

(4) A process of painting the pattern portion with the surrounding average color is performed on the photographed image (3), and matching with the template (1) is performed.

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

FIG. 19 shows an example of the number of matches by shooting distance. FIG. 19A shows an example of the authentication result by the capacitance method, and FIG. 19B shows 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 mounted is zero. FIG. 20 shows the average match score for each shooting distance. FIG. 20A shows an example of the authentication result by the capacitance method, and FIG. 20B shows 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 mounted is 0.

Without the prototype, all subjects succeeded in matching fingerprints from the captured images. The longest match distance is 3 m, which is not difficult for a voyeur to take a picture without his / her awareness.

When the prototype was attached, detection of feature points failed for 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 painted image exhibited a higher disturbing effect than the previous simulation. This is due to the fact that the process of removing the border line fringes is insufficient in the process of detecting the filled area from the photographed image. In other words, the result was that most were not authenticated.

Table 5 shows an example of the authentication result by the fingerprint sensor. (A) shows the authentication result of the capacitance method, and (b) shows the authentication result of the optical method. Next, the prototype created this time was installed, and it was verified whether legitimate fingerprint authentication by the fingerprint sensor succeeded. For each type of fingerprint sensor, the template and authentication images were read 3 times each, and a total of 9 matches were performed, and the number of successes and the maximum and minimum values of the match score were tabulated. Table 5 shows the results.

Matching was successful in all trials for 3 out of 4 people. The large variation in the match score is a result of the unstable placement of the finger with respect to the fingerprint sensor, and this is also the case with normal fingerprint authentication. The number of successful subjects B was particularly low as a result of unstable finger placement when reading the template, and since only a portion of them was always matched, the overall match score was low. That is, most of the results were authenticated.

As described above, according to the present embodiment, it is possible to provide a biometric sneak shot preventing wearing device that makes it impossible to restore a biometric feature from a photographed photo while reacting normally to a contact-type biometric feature sensor.

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

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

In the first embodiment, an example in which the biometric feature voyeurism prevention mounting tool has printed the pattern of the disturbing portion 5 on the surface of the base portion 4 has been described. Or the example which is a glove is demonstrated.

That is, a finger sack or gloves is used to make it difficult for the wearing tool to come off the finger. A finger sack or glove is used for the base part 4 and a pattern of the disturbing part 5 is printed on the surface thereof. Printing is not limited to transfer, and general-purpose printing such as printing, screen printing, and inkjet printing can also be used. Other configurations are the same as in the first embodiment, and as in the first embodiment, the biometric feature sneak shot that makes it impossible to restore the biometric feature from the photographed photo while reacting normally to the contact-type biometric feature sensor. Preventive wearing equipment can be provided.

In the third embodiment, an example in which the biometric feature sneak shot prevention wearing device is a finger sack or a glove in which a pattern is embedded will be described.

In the second embodiment, the example in which the pattern is formed on the surface of the finger sack or glove has been described. In this example, an example in which the pattern is embedded in the finger sack or glove will be described. That is, a case where a finger sack or a glove is manufactured with a pattern sandwiched between two sheets. Printing on one sheet is not limited to transfer, and general-purpose printing such as print printing, screen printing, and ink jet printing can also be used.

Other configurations are the same as in the first embodiment, and the biometric feature voyeurism that makes it impossible to restore the biometric feature from the photographed photograph while reacting normally to the contact-type biometric feature sensor as in the first embodiment. Wearing equipment can be provided.

In the fourth embodiment, a case where the biometric feature is a palm print will be described.

The palm pattern is also a pattern unique to a living body, like a fingerprint, and has irregularities due to ridges and valleys. Therefore, in order to prevent voyeurism, like a fingerprint, the biometric feature voyeurism prevention wearing tool is transparent in the visible light region, has a base part 4 that covers the biometric feature 3 region, and has light scattering characteristics in the visible light region. And a disturbance unit 5 that covers the biometric feature 3 region.

Therefore, as in the first embodiment, it is possible to provide a biometric sneak shot preventing wearing device that makes it impossible to restore a biometric feature from a photographed photo while reacting normally to a contact-type biometric feature sensor.

Application to Example 2 and Example 3 is also possible.

FIG. 21 shows a manufacturing procedure of the biological feature sneak shot prevention wearing tool in this embodiment. In this embodiment, an example in which the base layer is not used will be described. FIG. 21A is a diagram showing a process of preparing a paint, FIG. 21B is a diagram showing a process of applying the paint to a silicon rubber sheet, and FIG. It is a figure which shows a process.

First, an application material and a sticking device are prepared. The coating material is a cream-like or gel-like paint having light scattering characteristics in the visible light region. For example, a paint obtained by mixing a water-soluble acrylic paint with an acrylic solvent is used. The interference effect increases as the concentration increases. However, when the concentration is increased, acrylic paints are quick-drying and finish quickly. If the concentration is too high, the paint becomes dry and difficult to apply. Here, the acrylic paint is used as a material for experiments, and a material safe for the human body is preferable. Therefore, there is a possibility of improvement / change at a practical level. Examples of materials that are safe for the human body include silicone rubber, latex, and artificial skin for medical use.

The affixing device 22 is a device for affixing an application material on the surface of the skin having biological characteristics. For example, a transfer plate (stencil) that attaches the coating material 21 to the surface of the skin having biological features through a plurality of micropores, and the coating material 21 transferred through the plurality of micropores has a pattern similar to the biological features. A plurality of micropores are arranged so as to form By arranging a plurality of minute holes, a pattern of the stencil 22, that is, a pseudo fingerprint pattern is formed. The physical properties necessary as an appropriate coating material for using the transfer plate (stencil) are the same as those of the ink used for the silk screen, and are as follows.

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

-If the film thickness is several μm to 100 μm: thicker than 100 μm, the fingerprint sensor may not react normally. If the thickness is less 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, a stencil 22 having a pseudo fingerprint pattern is overlaid on the paint 21 applied to the surface of the silicone rubber sheet 23. Next, when the finger 24 is put 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 made by silk screen plate making. The pseudo-fingerprint pattern of the stencil 22 is created by modifying a pattern in which a fingerprint is taken in by a computer program, for example. The stencil 22 is created, for example, by making a pseudo fingerprint on a silk screen.

FIG. 23 shows an example of the appearance of the pseudo fingerprint transferred to the surface of the finger 24. The base layer is not undercoated on the surface of the finger 24, 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 soap or the like.

FIG. 24 shows a flowchart of pseudo fingerprint production in the present embodiment. First, the coating material 21 and the sticking device 22 are prepared (S010). The coating material 21 is a cream-like or gel-like material having light scattering characteristics in the visible light region, and for example, a water-soluble acrylic paint mixed with an acrylic solvent can be used. Moreover, since the coating material 21 is affixed on the surface of the skin having biological characteristics, the coating material 21 is required to have quick drying properties and adhesion to the skin. The affixing device 22 is a device for affixing the coating material 21 to the surface of the skin having biological characteristics. For example, the stencil for affixing the paint as the coating material 21 to the surface of the skin having biological characteristics through a plurality of micropores. 22 can be used. Here, the stencil 22 is provided with a plurality of micropores so that the coating material 21 transferred through the plurality of micropores forms a pattern similar to the biometric feature.

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 downward 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.

FIG. 25 and FIG. 26 are diagrams (No. 1) and (No. 2) for explaining the interference effect on fingerprint detection from a photograph. FIG. 25 shows an example using the pattern of FIG. 18, and FIG. 26 shows an example of this embodiment. The method using the pattern of FIG. 18 is a method in which the detection of a fingerprint by a photograph is failed by superimposing a geometric shape as noise. FIG. 25A is an example of a photographed image, and FIG. 25B is an enlarged view of the binarized image. According to this method, ridges are fragmented by edge enhancement and feature points are concealed in the pattern area, which is effective for obstruction. On the other hand, it is necessary to increase the pattern area as a countermeasure against pattern cancellation by image processing. In other words, it is preferable to make the detection of a fingerprint by a photograph fail by increasing the area of the geometric pattern.

FIG. 26 shows an example according to this embodiment. By superimposing a pseudo fingerprint as noise, an erroneous fingerprint is recognized and the detection of the fingerprint (the person's original fingerprint) is obstructed. FIG. 26A is an example of a photographed image, and FIG. 26B is an enlarged view of the binarized image. According to this method, it is possible to prevent pattern cancellation by filtering (removing a pattern having the feature by grasping the feature of the pattern) with a spatial frequency close to that of a regular fingerprint. That is, by superimposing a pattern similar to the original fingerprint, a false feature point is added to the captured fingerprint in addition to the correct feature point of the original fingerprint, so that it is recognized as an incorrect biometric 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 interference effect on fingerprint detection. If advanced analysis technology is used, the features of the pseudo biometric feature pattern may be grasped and the biometric feature and the pseudo biometric feature pattern may be separated, that is, the biometric feature may be estimated. In order to prevent this, it is preferable to use a pseudo-biological feature pattern having a similar repetition frequency. In this way, by convolution of the biometric feature pattern with the biometric feature, a new feature point is generated at the original feature point so that the biometric feature cannot be recognized. Since it becomes difficult to separate the pseudo biometric feature pattern, it is possible to prevent the biometric feature from being estimated.

The interval 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, 0.4 × 500 / 25.4 = 7.874 pixels, and the spatial frequency is the reciprocal of 0.127 (1 / Pixel). Therefore, although different depending on the person, for example, the effect can be expected by setting the interval between the pseudo fingerprints within 0.4 mm ± 20%.

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

FIG. 28 shows an example of the optical sensor 10B. FIG. 28A is a schematic diagram illustrating a sensor configuration, and FIG. 28B is a diagram illustrating an example of a detected fingerprint. The optical sensor 10B maps the total reflection light at the boundary between the prism 12 and the air layer to an 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 (possibility) of detecting the pattern of the pseudo fingerprint. Therefore, in order to reduce the influence of the pseudo fingerprint, it is necessary to examine the material of the paint (paint) 21 and the application method (thinning, etc.).

FIG. 29A is a diagram showing the influence on the acquired image due to photography by the mixing ratio of the paint and the solvent. 29A (a)-(d) shows a photograph of a finger obtained by using a prototype of a fingerprint voyeurism prevention wearing device and transferring the same pseudo-fingerprint pattern with varying opacity. Shown in 29A (e)-(h). The latter scales the photograph 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 influence on the acquired image by the fingerprint sensor due to the mixing ratio of the paint and the solvent. Images obtained by the capacitive fingerprint sensor for each sample shown in FIG. 29A are shown in FIGS. 29B (a)-(d). Since ink adheres mainly to the convex portions (ridges) of the fingerprint, the distance between the skin and the electrode changes depending on whether the pattern is superimposed on the ridges. As a result, the fragmentary colors on the ridges Appears as unevenness. Since there is no effect on the concave portions (valley lines) of the fingerprint, the characteristics of the fingerprint are not greatly changed, and there is no problem in performing proper fingerprint authentication.

Images obtained by the optical fingerprint sensor for the same samples are shown in FIGS. 29B (e)-(h). Since the image is bright in air-interrupted portions such as bubbles and gaps and dark in other portions, the contrast between the line on the pseudo fingerprint pattern and the outline is high, and noise appears more noticeably than in the capacitive method. As the opacity increases, the degree to which the concave portions (valley lines) of the fingerprint are concealed increases, and the fingerprint recognition rate tends to decrease in the optical method that is sensitive to surface irregularities as compared with the capacitance method.

Tables 6 and 7 are tables showing matching results related to fingerprint authentication. For each sample shown in FIG. 29A and FIG. 29B, an experiment of fingerprint matching was performed using an image obtained by binarizing a photograph taken and an image obtained by a fingerprint sensor. For each sample, three fingerprint images (capacitance method and optical method) and three photographic input images were prepared. A total of nine matchings were performed on each of the three input images with respect to the three registered images acquired in advance by the fingerprint scanner. For matching, commercial fingerprint recognition software VeriFinger is used, and when the match score is 48 or more, it is determined that the match is FAR 0.01%.

For each sample, Table 6 shows the number of matches for nine matching trials. In the matching from the captured image, it can be seen that when the opacity is 8%, all trials are matched as in the case without the pseudo fingerprint pattern, and the expected interference effect is not obtained. In other cases, the number of matches is zero, and it can be seen that fingerprint recognition from the photographed image can be effectively prevented. On the other hand, in the matching with the image acquired by the fingerprint sensor, in almost all cases, it matches in all trials, and it can be seen that legitimate authentication by the fingerprint sensor is not hindered. However, in the sample with opacity of 39%, the number of matches is reduced by the optical fingerprint sensor, and there is an upper limit in setting the opacity. For each sample, the maximum match score for 9 matching trials is shown in Table 7. For the photographed photos, the visibility of the pseudo-fingerprint pattern properly affects the match score. Contrary to the intuition, the image obtained by the fingerprint sensor has a higher match score as the opacity is higher. This is a result of the gradation correction and blurring caused by the contrast correction of the fingerprint sensor, which affects the detection of feature points.

Based on the above results, it is desirable that the opacity is at least about 15% in order to make the fingerprint recognition from the photograph fail, and at the same time, the opacity is about 30% at the maximum for successful fingerprint authentication by the fingerprint sensor. Is desirable. That is, it was found that 15% to 30% is a preferable range.

As described above, according to the present embodiment, it is possible to provide a method for preventing a sneak shot of a biometric feature that reacts normally with the biometric feature sensor and makes it impossible to restore the biometric feature from the photographed image.

In Example 6, the application device for applying the application material is a skin having a biometric feature by placing the application material on the tips of a plurality of projections and pressing the plurality of projections on the surface of the skin having a biometric feature. An example of a transfer plate for applying a coating material to the surface of the substrate will be described.

FIG. 30 shows a flowchart of pseudo fingerprint production in the present embodiment. First, the coating material 21 and the application 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. The sticking device 22A (not shown), for example, places the coating material 21 on the tips of a plurality of protrusions and presses the plurality of protrusions against the surface of the skin having biological characteristics to apply the coating material on the surface of the skin having biological characteristics. A stamper 22A to be attached can be used. Here, a plurality of protrusions are arranged on the transfer 22A by pressing a plurality of protrusions on the stamper 22A. The lower the height of the protrusion, the better it is to draw a fine pseudo-fingerprint pattern. However, at least when the protrusion is pressed against the skin and when the paint is placed on the protrusion, a height that does not adhere to any part other than the protrusion is required.

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 pseudo-fingerprint is transferred to the surface of the finger 24 in the same manner as in the fifth embodiment. As in the fifth embodiment, the biometric feature sensor responds normally and the biometric feature cannot be restored from the photographed image. It is possible to provide a biometric feature sneak shot prevention method.

In Example 7, an example in which the application tool for applying the application material is a finger sack that applies the application material to the surface of the skin having biological features through a plurality of micropores will be described.

FIG. 31 shows a flowchart of pseudo fingerprint production in the present embodiment. First, the coating material 21 and the sticking device 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 sack 22B for sticking a coating material to the surface of the skin having biological characteristics through a plurality of micropores can be used. Here, the plurality of micro holes are arranged in the finger sack 22B so that the coating material transferred through the plurality of micro holes forms a pattern similar to the biometric feature.

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

The pseudo-fingerprint is transferred to the surface of the finger 24 in the same manner as in the fifth embodiment. As in the fifth embodiment, the biometric feature sensor responds normally and the biometric feature cannot be restored from the photographed image. It is possible to provide a method for preventing voyeurism of biometric features.

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

FIG. 32 shows a flowchart of pseudo fingerprint production in the present embodiment. First, the coating material 21 and the sticking device 22C (not shown) are prepared (S013). As the coating material 21, for example, an ultraviolet curable resin can be used. For example, the application tool 22C applies the application material 21 to the surface of the skin having biological characteristics, and then applies the application material 21 by irradiating the application material 21 on the surface of the skin with ultraviolet rays through a plurality of micropores. An attached stencil 22C can be used. Here, in the stencil 22C, the plurality of micropores are arranged in the stencil 22C so that the coating material that is cured by the ultraviolet rays passing through the plurality of micropores forms a pattern similar to the biometric feature.

Next, the paint 21 is applied to the finger surface (S023). Next, the stencil 22C is overlaid on the applied paint 21 (S033). Next, ultraviolet rays are irradiated through the micropores of the stencil 22C to cure the portion irradiated with the ultraviolet rays in the coating material 21 (S043). Next, when a 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).

In Example 9, an example in which the base layer is used in Example 5 will be described. When the base layer is inserted between the pseudo biometric features, the biometric features are easily pasted. On the other hand, the pattern becomes thick, and biometric feature authentication becomes somewhat difficult. In the ninth embodiment, the base layer corresponds to the base portion 4 of the first to fourth embodiments. The light disturbing film corresponds to the disturbing portion 5 of the first to fourth embodiments.

FIG. 33 shows a flowchart of pseudo fingerprint production in the present embodiment. First, a base layer material 25 (not shown), a coating material 21, and a sticking device 22 are prepared (S015). The coating material 21 and the sticking device 22 are the same as those in the fifth embodiment. The base layer material 25 is transparent in the visible light region, becomes a cream when dissolved in water, adheres to the skin, and smoothes the unevenness of the biological features. For example, a water-soluble acrylic resin having a visible light reflectance of, for example, 4% (lower is preferable because of higher transparency) and a relative dielectric constant of 2.7 to 4.5 can be used. Moreover, since it affixes on the surface of the skin which has a biological feature, it is calculated | required that the base layer material 25 has quick-drying property and adhesiveness to skin.

Next, the base layer material 25 is applied to the finger surface (S018). The subsequent steps (S020) to (S050) are the same as in the fifth embodiment.

The base layer can also be applied to the sixth to eighth embodiments. Also in these cases, after the step (S015) of preparing the base layer material 25 (not shown), the coating material 21 and the application tool 22 (S015), the step of applying the base layer material 25 to the finger surface (S018) is performed. Moreover, what is necessary is just to follow the process after the process which prepares the coating material 21 and the sticking instrument 22 of Example 6 thru | or Example 8. Also in these cases, the pseudo-fingerprint is transferred to the surface of the finger 24 in the same manner as in the fifth embodiment. As in the first embodiment, the biometric feature sensor reacts normally and the biometric feature from the photographed photograph is taken. It is possible to provide a method for preventing the voyeurism of a biometric feature that makes it impossible to restore the image.

In this embodiment, an example in which the sticking device is a tattoo seal will be described. The coating material is ink for tattoo sealing or ink applied to a tattoo seal. The transfer procedure is, for example, as follows. First, prepare a tattoo sticker and ink. A commercially available tattoo seal can be used, and consists of a printed base sheet and an adhesive sheet. As the ink, a commercially available ink for a printing apparatus can be used, and printing can be performed on a printing base sheet using these printing apparatuses.

Next, the pseudo fingerprint pattern is printed on the printing base sheet. For example, printing is performed with a commercially available printing device. The pseudo-fingerprint pattern is a pattern similar to the original fingerprint and is a pattern that enables authentication by pressing the original fingerprint and prevents sneak shot of the original fingerprint. Here, a similar pattern refers to a pattern that is similar to a biometric feature but is not authenticated for the biometric feature. Next, the printing base sheet on which the pseudo fingerprint pattern is printed is dried and attached to the pressure-sensitive adhesive sheet to which the pressure-sensitive adhesive is applied. Next, the printing base sheet is peeled off from the adhesive sheet, and the printing base sheet is attached so that the surface on which the pseudo fingerprint pattern is printed is directed to the surface of the finger having the fingerprint.

Next, rubbing the back side of the printed base sheet so that it is in close contact with the finger, and if water or cloth or paper is applied to the back side, the ink penetrates the finger together with water, and the pseudo fingerprint pattern is transferred to the finger surface. The Next, the printed base sheet is peeled off from the finger.

The pseudo-fingerprint is transferred to the surface of the finger 24 in the same manner as in the fifth embodiment. As in the first embodiment, the biometric feature sensor responds normally and the biometric feature cannot be restored from the photographed image. It is possible to provide a method for preventing voyeurism of biometric features.

34 to 36 show examples (No. 1 to No. 3) of pseudo fingerprint transfer in this embodiment. In this embodiment, a description will be given of an example in which a similar pattern that is attached to the surface of a living body using a sticking device is different for each attachment.

In FIG. 34, the sticking device has a transfer tape 34 having a plurality of pseudo fingerprint patterns drawn by a plurality of micro holes, and a stamper 30 for pressing the pseudo fingerprint pattern drawn on the transfer tape 34 against the surface of the skin having the fingerprint. Then, the stamper 30 having the ink stand 33 for supplying 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 is located at the position of the stamper 30. An example in which a pair of take-up

reels

31 and 32 for moving 34 is provided in the box 35A will be described. Since the ink is provided in the box 35A, the ink can be prevented 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, a transfer tape 34 having a pseudo fingerprint pattern formed by a plurality of micro holes is pressed against a finger by a stamper 30 and ink as a coating material is pushed out from the micro holes to transfer the pseudo fingerprint pattern to the finger.

FIG. 34A is a diagram showing a state at the time of winding a tape depicting a pseudo fingerprint pattern in the sticking device, and FIG. 34B is a diagram showing a situation at the time of pseudo fingerprint transfer of the sticking device. In FIG. 34A, a tape 34 on which a pseudo fingerprint pattern is drawn is wound around a pre-use tape take-up reel 32 before use. Tape 34 is typically flat. The pattern to be transferred is moved to the position of the stamper 30 using the pair of take-up

reels

31 and 32. At this position, the tape 34 is exposed. After use, the tape 34 is wound around 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, for example, as a different pattern for each pasting, even if the previous pattern is known, the pattern is changed so as not to be voyeurized as much as possible. In FIG. 34B, when the pattern of the tape 34 is transferred to the finger, the transfer ink base 33 is pressed against the finger by the stamper 30 with the tape 34 interposed therebetween. As a result, the pseudo fingerprint pattern drawn on the tape 34 is transferred to the finger. With this configuration, since the transfer tape 34 and the stamper 30 on which a plurality of patterns are formed are used, continuous transfer processing can be performed.

FIG. 35 shows an example (part 2) of pseudo-fingerprint transfer in this embodiment. In this embodiment, an example of a stamper in which the sticking device has a protrusion is shown. FIG. 35A shows an example in which the transfer tape 34 is sealed in the box, and FIG. 35B shows an example in which the transfer seal 39 is sealed in the bag. In FIG. 35A, in order to prevent ink drying, the transfer tape 34, the tape take-up mechanism (roller 37), and the ink base 33 containing the ink are housed in a sealed box 35B. 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. A pattern to be transferred is moved to a position facing the ink base 33 (that is, a position facing the lid 36) by using a 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 take-up mechanism (roller) 37, and the ink base 33 are accommodated in the sealed box 35B, it is possible to prevent the ink from drying. In FIG. 35B, the pseudo fingerprint pattern has protrusions, and the transfer sheet 39 with the ink attached to the tips of the protrusions is sealed in a package (bag) 38. In use, when the transfer sheet 39 is removed 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, the drying of the ink can be prevented. Continuous transfer can also be performed by sequentially transferring the transfer sheet 39 to transfer.

FIG. 36 shows an example (part 3) of pseudo-fingerprint transfer in this embodiment. In this embodiment, an example in which a transfer seal 43 on which a pseudo fingerprint pattern is drawn is attached to a finger is shown. 36 (a) shows a tape winding type (part 1), FIG. 36 (b) shows a tape winding type (part 2), and FIG. 36 (c) shows a transfer seal 43 depicting a pseudo fingerprint pattern on two sheets. An example in which the sheet is held between (protective sheet 41 and release sheet 42) is shown. In FIG. 36 (a), a plurality of transfer seals 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 diamond 40 are housed in a small-sized case (box) 35C, and the pre-use tape take-up reel 32 and the post-use tape take-up reel are used. Between the reels 31, one transfer seal on which one pseudo fingerprint pattern is drawn is exposed. 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 is at the exposed position. When the finger is pressed against the exposed pseudo fingerprint pattern, the transfer seal 43 depicting the pseudo fingerprint pattern is peeled off from the transfer tape and attached to the finger. Since the adhesive is adhered to both surfaces 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. 36B, the shape of the case (box) 35D is a raindrop type, and the transfer tape 34 is rotated along the shape of the raindrop using a roller 37 (not shown) and exposed at the tip of the raindrop. When the finger is pressed against the exposed pseudo fingerprint pattern, the transfer seal 43 depicting the pseudo fingerprint pattern is peeled off from the transfer tape 34 and attached to the finger. In FIG. 36C, the transfer seal 43 on which the pseudo fingerprint pattern is drawn is held between the protective sheet 41 and the release sheet 42. When the protective sheet 41 is peeled from the release sheet 42, the transfer seal 43 depicting the pseudo fingerprint pattern is exposed. When the finger is pressed against the transfer seal 43, the transfer seal 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 a separate package. The transfer seal 43 is held between two

sheets

41 and 42 of a separate package (the transfer seal 43 is held between a protective sheet 41 and a release sheet 42), and a plurality of separate packages are carried in a case 44. Carry it in. The use of the carrying case 44 is convenient because a large number of separate packages can be carried, and the pseudo-fingerprint pattern can be changed at an appropriate time. By placing the transfer seal 43 in the carrying case 44, the ink attached to the transfer seal 43 can be prevented from drying.

FIG. 38 shows the carrying case 44 and the separate package separately. FIG. 38 (a) shows a separate package and transfer seal 43, and FIG. 38 (b) shows a carrying case 44. FIG. Variations of the pattern of the protective sheet 41 (front side) of the separate package are shown in the right column of FIG. For example, aluminum paper is used for the protective sheet 41. In the middle row, a transfer seal 43 is placed on a release sheet (back surface) 42. For the release sheet 42, for example, vinyl paper is used. FIG. 38B 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 process of taking out the transfer seal 43 from the separate package and transferring the pseudo fingerprint pattern to the finger. 39A is a step of peeling the protective sheet 41 from the separate package, FIG. 39B is a step of taking out the transfer seal 43 from the separate package, and FIG. 39C is a state where a finger is pressed against the transfer seal 43. The process of transferring a pseudo fingerprint pattern to a 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. 40A shows a state where the transfer seal 43 is attached to the finger and then peeled off from the finger, and FIG. 40B shows a photographed pattern. In the photographed pattern, a pseudo fingerprint pattern of the transfer seal 43 appears strongly, and a voyeurism blocking effect is obtained.

In the eleventh embodiment, the case where the base layer is not formed on the finger surface has been described. However, a base layer that is transparent in the visible light region and covers the biological feature region may be formed. In other words, Example 11 is a sheet to be attached to the surface of the skin having biological features, which is transparent to the visible light region and covers the biological feature region on one side; And a disturbance portion of a predetermined pseudo-biological feature pattern having a light scattering characteristic in the visible light region; and a sheet. When the base layer is inserted between the finger surface and the pseudo fingerprint pattern, the pseudo fingerprint pattern is easily transferred. For example, a base layer may be formed on the finger surface as described with reference to FIG. 7A before the pattern transfer operation described with reference to FIGS. Further, in the case of the transfer tape 34, the transfer sheet 39, or the transfer seal 43 shown in FIGS. 35 and 36, a base layer is formed on the pseudo fingerprint pattern, and if the finger is pressed, the base layer is transferred together with the pseudo fingerprint pattern. Is done.

FIG. 41 shows an example of a pseudo fingerprint pattern. 41A shows a kernel size k = 3 (about 0.15 mm), FIG. 41B shows a kernel size k = 11 (about 0.5 mm), and FIG. 41C shows a kernel size k = 99 (about 5 mm). ) Example. The kernel size is an index that represents the range of affected pixels, and the numbers in parentheses are values converted to mm units. 41 (a), (b), and (c) in this order, the width of the line representing the fingerprint increases and the kernel size also increases. When k = 3, high frequency noise of the optical sensor is dominant, and when k = 99, color unevenness due to blood flow is dominant. Since the average interval between human fingerprints is about 7 pixels, it can be estimated that k = 7 is optimal. When the spatial frequency difference between the original fingerprint and the pseudo fingerprint pattern is large, there is a possibility that the influence of the pseudo fingerprint pattern can be removed by a filter operation. On the other hand, if the spatial frequency of the pseudo fingerprint pattern is set to the same level as that of the original fingerprint, such a filter operation becomes difficult.

Furthermore, in order to enhance the obstruction effect of the biometric feature sneak shot prevention according to the present invention, the following may be mentioned.

(A) A micro-order bead is embedded in a seal or finger sack having a pseudo fingerprint pattern. In the μ order, no irregularities appear on the surface of the seal or finger sack. However, if a photograph is taken, the fingerprint pattern on the surface cannot be photographed correctly due to the reflected light from the beads. For this purpose, the beads are required to have a high reflectivity, which causes a strong gloss on the photographed fingerprint and enhances the disturbing effect. Fingerprint ridges and valleys are on the order of 0.1 mm in size, 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 finger sack. 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 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 example.

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

For example, in the first to fourth embodiments, the example in which the pattern covers a part of the biometric feature has been described, but it may be a monochromatic pattern that covers the entire biometric feature. Moreover, when the base part 4 also has the function of the disturbance part 5, or the case where it produces with the mixture of a base part and a disturbance part is assumed. In Examples 1 to 4, the base part is an example of a water-soluble acrylic resin, and the disturbing part is an acrylic paint. However, the base part is transparent in the visible light region, and the disturbing part is in the visible light region. If it has, you may use these materials.

For example, in the fifth to eleventh embodiments, an example in which the biometric feature is a fingerprint has been described, but a pseudo palm print / pseudo vein print can be similarly applied to a palm print / vein print. The pseudo biometric feature may be created by modifying an existing biometric feature, or a pattern similar to the biometric feature may be created by a computer. In the fifth to eleventh embodiments, the example in which the pseudo biometric feature pattern covers a part of the biometric feature has been described. However, the biometric feature may be misidentified by covering the entire biometric feature. The coating material is not limited to white, and may be other colors such as skin color or translucent as long as visible light is reflected. Further, the base layer material is not limited to transparent, and may be other colors such as skin color as long as visible light is transmitted, or may be translucent. In Examples 5 to 11, an example in which the coating material is an acrylic material has been described. However, as long as 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 may be used. May be used. Moreover, although the example which set the distance which can voyeur with a camera to 5 m was demonstrated, you may think that it changes with the performance of a camera. In addition, since the skin color changes with race and sunburn, it is considered that there is a range of colors.

The present invention is used for preventing biometric feature voyeurism.

1 Biometric feature voyeurism prevention equipment (fingerprint voyeurism prevention equipment)

2 Living body (skin)

3 Biometric features (fingerprint)

4 Base part (base layer)

5 Disturbance Department

10A Capacitive fingerprint sensor

10B optical fingerprint sensor

11 Contact surface

12 Prism

13 Fingerprint ridges

14 Fingerprint valley

15 Light source

16 Image sensor

17 Passivation film for capacitive fingerprint sensor

21 Application material (paint)

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

22A Stamper

22C finger sack

23 Silicone rubber sheet

24 fingers

25 Base layer material

30 stamp stand

31 Tape reel after use

32 Tape take-up reel before use

33 Ink stand

34 Transfer tape

35A-35D box

36 lid

37 rollers

38 packages

39 Transfer sheet

40 Winding dial

41 Protection sheet

42 Release sheet

43 Transfer seal

44 Carrying case

Claims

Comprising a disturbing portion having light scattering characteristics in the visible light region and covering the biological feature region;

The disturbing portion scatters light in the visible light region on the surface, while enabling biometric authentication by pressing biometric features;

Biometric voyeurism prevention wearing tool.
A base part transparent to the visible light region and covering the biological feature region;

The base part is a thin film formed in contact with the biological feature region, and the disturbing part is formed in a thin film contact with the base part;

The biological characteristic sneak shot prevention wearing tool according to claim 1.
The base portion is in close contact with the living body and does not leave bubbles during authentication by the contact-type biometric feature sensor;

The biological characteristic sneak shot prevention wearing tool according to claim 2.
The light scattering characteristic is a characteristic that prevents recognition of the biometric feature by visible light transmitted through the disturbance part and has a reflectance that allows the biometric feature that can be biometrically authenticated to be acquired by an optical biometric sensor;

The biological feature sneak shot preventing wearing device according to any one of claims 1 to 3.
The base part and the disturbing part have a refractive index capable of acquiring the biometric feature capable of biometric authentication by an optical biometric sensor using an optical prism;

The biological feature sneak shot preventing wearing device according to any one of claims 1 to 4.
The base unit and the disturbance unit have a relative permittivity that allows the biometric feature that can be biometrically authenticated to be acquired by a capacitive biometric sensor;

The biological feature sneak shot preventing wearing device according to any one of claims 1 to 3.
A base material that is transparent to the visible light region and covers the biological feature region;

A disturbing substance having a light scattering property in the visible light region and covering the biological feature;

Biological features Material for manufacturing anti-voyeur wearing equipment.
Using a cream-like or gel-like coating material having light scattering characteristics in the visible light region, and a sticking device for sticking the coating material on the surface of the skin having biological characteristics,

An optical disturbance film made of the coating material having a predetermined pseudo-biological feature pattern, wherein the optical disturbance film that enables authentication by pressing the biological feature and prevents voyeurism of the biological feature is used with the application device Affixing said application material on the surface of the skin having biological characteristics;

The pseudo biometric feature pattern is a pattern that makes biometric authentication based on the biometric feature impossible to establish by being superimposed on the biometric feature;

A method to prevent voyeurism of biometric features.
The affixing device is a transfer plate that affixes the coating material to the surface of the skin having biological features through a plurality of micropores, and the coating material transferred through the plurality of micropores is the pseudo-biological feature. The plurality of micropores are disposed in the transfer plate to form a pattern;

The method of preventing the sneak shot of the biometric feature according to claim 8.
The affixing device places the coating material on tips of a plurality of protrusions, presses the plurality of protrusions against the surface of the skin having biological characteristics, and affixes the coating material to the surface of the skin having biological characteristics. The plurality of protrusions are arranged on the stamper such that the coating material transferred by pressing the plurality of protrusions forms the pseudo-biological feature pattern;

The method of preventing the sneak shot of the biometric feature according to claim 8.
The affixing device is a finger sack 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 feature. The plurality of micropores are disposed in the finger sack to form a pattern;

The method of preventing the sneak shot of the biometric feature according to claim 8.
The application device applies the application material on the surface of the skin having the biological characteristics, and then applies ultraviolet light to the application material on the surface of the skin through a plurality of micropores to cure and apply the application material. A plurality of the micropores disposed in the transfer plate such that the coating material that is cured by ultraviolet light passing through the micropores forms the pseudo-biological feature pattern;

The method of preventing the sneak shot of the biometric feature according to claim 8.
The affixing device includes a transfer tape depicting a plurality of the pseudo-biological feature patterns, a stamper for pressing the pseudo-biological feature patterns depicted on the transfer tape against the surface of the skin having biometric features, and a plurality of the A pair of take-up reels for moving the transfer tape so that the pattern to be transferred among the pseudo-biological feature patterns is positioned at the stamper;

The method of preventing the sneak shot of the biometric feature according to claim 8.
The pseudo-biological feature pattern that is affixed to the surface of the living body using the affixing device is different for each affixing time;

The method of preventing the sneak shot of the biometric feature according to any one of claims 9 to 13.
The pseudo biometric feature pattern is a pattern having a spatial frequency that is difficult to separate from the biometric feature;

The method of preventing the sneak shot of the biometric feature according to any one of claims 9 to 13.
Using a cream-like or gel-like coating material having light scattering characteristics in the visible light region, and a sticking device for sticking the coating material on the surface of the skin having biological characteristics,

An optical disturbance film made of the coating material having a predetermined pseudo-biological feature pattern, wherein the optical disturbance film that enables authentication by pressing the biological feature and prevents voyeurism of the biological feature is used with the application device Affixing the coating material on the surface of the skin having biometric features to form a biometric voyeurism-preventing wearing device;

The pseudo biometric feature pattern is a pattern that makes biometric authentication based on the biometric feature impossible to establish by being superimposed on the biometric feature;

A method of manufacturing a biological feature sneak shot prevention wearing device.
A cream-like or gel-like coating material having light scattering properties in the visible light region;

An application tool for applying the application material to the surface of the skin having biological features;

A manufacturing set of biometric voyeurism prevention fittings that prevent voyeurism of biometric features;

The affixing device is an optical disturbance film made of the coating material having a predetermined pseudo-biological feature pattern, and an optical disturbance film that enables authentication by pressing the biological feature and prevents voyeurism of the biological feature is attached. A method corresponding to any one of claims 9 to 13 is realized for attaching;

A set of biometric voyeurism prevention equipment that prevents voyeurism of biometric features.
A method of enabling authentication by pressing the biometric feature and preventing voyeurism of the biometric feature by forming a predetermined pseudo-biological feature pattern on the surface of the skin having the biometric feature;

The pseudo biometric feature pattern is a pattern that makes it impossible to establish biometric authentication based on the biometric feature by being superimposed on the biometric feature, and has a spatial frequency that is difficult to separate from the biometric feature;

A method to prevent voyeurism of biometric features.
An application material capable of forming a predetermined pseudo-biological feature pattern on the surface of the skin having biological features;

A sticking device for forming the simulated biological feature pattern on the surface of the skin having biological features using the coating material;

The coating material and the sticking device refer to the coating material and the sticking device according to the method for preventing a sneak shot of a biometric feature according to claim 18;

A set of biometric voyeurism prevention equipment.
A sheet having a pasting function for pasting a cream-like or gel-like coating material having light scattering characteristics in the visible light region to the skin surface having biological characteristics,

The pasting function is a light disturbing film made of the coating material having a pseudo biological feature pattern, which enables authentication by pressing the biological feature, and prevents the sneak shot of the biological feature. Is formed on the surface of the skin having the biological characteristics.

The pseudo biometric feature pattern is a pattern that makes biometric authentication based on the biometric feature impossible to establish by being superimposed on the biometric feature;

A sheet characterized by that.
The affixing function is a transfer plate that affixes 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 applies the light disturbing film. The plurality of micropores are disposed in the transfer plate to form;

The sheet according to claim 20.
The sticking function is for placing the coating material on 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 to the surface of the skin having biological characteristics. A plurality of protrusions disposed on the transfer plate such that the coating material that is transferred by pressing the plurality of protrusions forms the light disturbing film;

The sheet according to claim 20.
A manufacturing set of a biological feature voyeurism-preventing wearing device that uses the sheet according to any one of claims 20 to 22 to attach the light disturbing film to a surface of the skin having the biological feature,

A stamper for pressing the sheet against the surface of the skin having biological features, and a pair of take-up reels for moving the sheet so that the desired pseudo-biological feature pattern is positioned at the stamper;

A production set of biometric voyeurism prevention equipment characterized by that.