JP2006098340A - Interior portion detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interior portion detecting device of large degree of freedom for installation, in addition to light error. <P>SOLUTION: The interior portion detecting device includes: an illuminant 62 irradiating a near infrared ray and a visible ray of any wavelength in a two or more kinds of electromagnetic waves i.e., from 700nm to 1000nm, which contains at least one near infrared ray and have different wavelengths each other, to the same section of a living body one by one; an imaging sensor 65 detecting the electromagnetic wave reflected from the living body; a first memory 68 memorizing the data of image focused by the reflected electromagnetic wave; and a differential operating section 69 creating a picture image of different part from the image focused by visible ray, the electromagnetic wave other than near infrared ray, from the data of the image focused by the reflected electromagnetic wave, among the images focused by near infrared ray. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an internal detection device, and more particularly to an internal detection device capable of creating a blood vessel pattern image.

  The current personal authentication technology is represented by fingerprint authentication. A problem with fingerprint authentication is that it can be counterfeited. This is because it is easy to obtain another person's fingerprint. The reason why it is easy to obtain another person's fingerprint is that the fingerprint can be collected from the object touched with the finger. Fingerprint authentication has a problem that fingerprints may not be measured. The reason why the fingerprint cannot be measured is that the fingerprint is worn by some persons (persons engaged in occupations using fingertips such as a hairdresser). In recent years, these have become factors for developing personal authentication techniques other than fingerprint authentication.

  In Patent Document 1, a first image imaging circuit that obtains a first image by light transmitted through a subject, a second image imaging circuit that obtains a second image by reflected light from the subject, first and first Disclosed is a detection device including an arithmetic processing unit that obtains a blood vessel image of a subject by using the signal of the second image and excluding information added to the first image. According to the detection device disclosed in Patent Literature 1, it is possible to accurately detect a venous blood vessel pattern of an individual.

  In Patent Document 2, a light source that irradiates light to an imaging location of a living body, an imaging unit that detects transmitted light from the imaging location and images the living body, and a blood vessel of the living body from an image converted by the imaging unit An image calculation unit that extracts a running pattern and compares it with a pre-registered blood vessel pattern, and the amount of light emitted from the light source is optimized according to image information of the captured image An apparatus is disclosed. According to the authentication device disclosed in Patent Document 2, it is possible to prevent a decrease in the authentication rate.

  However, the invention disclosed in Patent Document 1 and the invention disclosed in Patent Document 2 have a problem that the degree of freedom of installation is greatly limited. For example, it can only be installed on the wall of a building. It cannot be mounted on a portable terminal. Such a problem arises because of the following reasons. The first reason is that the light source and the imaging element must be arranged so that the finger is always sandwiched between them. The second reason is that it is necessary to devise such that outside light (environmental light) does not enter.

In the invention disclosed in Patent Document 1 and the invention disclosed in Patent Document 2, there is also a problem that errors are increased in detected patterns. This is because normally performed image processing increases errors. Image processing is necessary because it is necessary to exclude wrinkles caused by finger bending, dirt attached to the fingers, and the influence of external light.
JP-A-11-203452 JP 2002-92616 A

  The present invention has been made to solve the problems of the embodiments, and an object of the present invention is to provide an internal detection device with a large degree of freedom in installation and with few errors.

  In order to achieve the above object, according to one aspect of the present invention, the internal detection device outputs two or more types of electromagnetic waves having at least one kind of first electromagnetic wave reflected inside the living body and having different wavelengths. Irradiating means for irradiating the same part of the living body one by one; detecting means for detecting electromagnetic waves reflected from the living body; storage means for storing image data connected by the reflected electromagnetic waves; In order to create an image of a portion different from an image connected by a second electromagnetic wave, which is an electromagnetic wave other than the first electromagnetic wave, from the image data connected by the reflected electromagnetic wave among the images connected by the first electromagnetic wave reflected internally. And creating means.

  That is, the first electromagnetic wave and the second electromagnetic wave have different wavelengths. When the wavelengths are different, the combination of the ratios of reflection for each part inside the living body may be different. The ratio of reflection in the living body itself may be different. The image connected by the first electromagnetic wave and the image connected by the second electromagnetic wave are obtained by the electromagnetic wave reflected from the living body. The creation means includes an image formed by the reflected electromagnetic wave and an image of a portion different from an image formed by the second electromagnetic wave that is an electromagnetic wave other than the first electromagnetic wave among the image formed by the first electromagnetic wave reflected inside the living body. Create from the data. Thereby, an image with few errors inside the living body can be obtained using the electromagnetic wave reflected from the living body. Since electromagnetic waves reflected from the living body are used, the degree of freedom of installation increases. As a result, it is possible to provide an internal detection device with a large degree of freedom in installation and with few errors.

  The first electromagnetic wave described above preferably includes infrared rays. In addition, the second electromagnetic wave preferably includes visible light.

  That is, the first electromagnetic wave includes infrared rays. The second electromagnetic wave includes visible light. Infrared rays are reflected inside the living body. Visible light reflects very little in the living body. The creation means includes an image formed by the reflected electromagnetic wave and an image of a portion different from an image formed by the second electromagnetic wave that is an electromagnetic wave other than the first electromagnetic wave among the image formed by the first electromagnetic wave reflected inside the living body. Create from the data. Thereby, since the influence of parts other than the inside of the living body is removed, an image with fewer errors inside the living body can be obtained. As a result, it is possible to provide an internal detection device having a large degree of freedom in installation and fewer errors.

  Moreover, it is desirable that the above-described infrared rays include infrared rays having any wavelength from 700 nm to 1000 nm.

  That is, infrared rays include infrared rays having any wavelength from 700 nm to 1000 nm. Infrared rays having any wavelength from 700 nm to 1000 nm are particularly different in the combination of the ratios of reflection at a site where hemoglobin is present compared to other infrared rays. As a result, errors are extremely reduced at the site where hemoglobin is present. As a result, it is possible to provide an internal detection device that has a large degree of freedom in installation, has fewer errors, and can extremely reduce errors at a site where hemoglobin is present.

  According to another aspect of the present invention, the internal detection device applies at least one type of two or more types of electromagnetic waves having different wavelengths to the same part of the living body. Irradiation means for irradiating each type, detection means for detecting electromagnetic waves reflected from the living body, first storage means for storing image data connected by the reflected electromagnetic waves, and the first electromagnetic waves First creation means for creating a first image representing a portion different from an image connected by a second electromagnetic wave, which is an electromagnetic wave other than the first electromagnetic wave, from the image data connected by the reflected electromagnetic wave. And a second image representing a part different from the image connected by the second electromagnetic wave among the images connected by the third electromagnetic wave that can enter the inside of the living body and are different from both the first electromagnetic wave and the second electromagnetic wave. , Reflected electromagnetic waves Of the first images, the second creating means for creating from the image data to be joined, the second storing means for storing either the first image or the second image, the second of the first images And third creation means for creating an image that is common to the images and that represents a portion having different brightness between the first image and the second image.

  That is, the first electromagnetic wave and the second electromagnetic wave have different wavelengths. The second electromagnetic wave and the third electromagnetic wave also have different wavelengths. When the wavelengths are different, the combination of the ratios of reflection for each part inside the living body may be different. The ratio of reflection in the living body itself may be different. An image connected by the first electromagnetic wave, an image connected by the second electromagnetic wave, and an image connected by the third electromagnetic wave are obtained by the electromagnetic waves reflected from the living body. The first creating means connects the first image representing a portion different from the image connected by the second electromagnetic wave, which is an electromagnetic wave other than the first electromagnetic wave, among the images connected by the first electromagnetic wave. Created from image data. The second creating means represents a portion different from the image connected by the second electromagnetic wave among the images formed by the third electromagnetic wave that can penetrate into the living body and are different from both the first electromagnetic wave and the second electromagnetic wave. A second image is created from data of an image formed by reflected electromagnetic waves. The third creating means creates an image that represents a part of the first image that is common to the second image and has different brightness between the first image and the second image. Thereby, an image with few errors is obtained for each part inside the living body using the electromagnetic wave reflected from the living body. Since electromagnetic waves reflected from the living body are used, the degree of freedom of installation increases. As a result, it is possible to provide an internal detection device with a large degree of freedom in installation and with few errors.

  The first electromagnetic wave preferably includes infrared rays having a wavelength of 700 nm to 800 nm. In addition, it is desirable that the third electromagnetic wave includes infrared rays having a wavelength from 800 nm to 1000 nm.

  That is, the first electromagnetic wave includes infrared rays having a wavelength from 700 nm to 800 nm. The third electromagnetic wave includes infrared rays having a wavelength from 800 nm to 1000 nm. An infrared ray having a wavelength from 700 nm to 800 nm has a lower ratio of reflection in a vein than an infrared ray having a wavelength from 800 nm to 1000 nm. An infrared ray having a wavelength of 800 nm to 1000 nm has a lower reflection rate in the artery than an infrared ray having a wavelength of 700 nm to 800 nm. Thereby, an image with few errors in an artery and a vein can be obtained using electromagnetic waves reflected from a living body. Since electromagnetic waves reflected from the living body are used, the degree of freedom of installation increases. As a result, it is possible to provide an internal detection device that has a high degree of freedom in installation and that has few errors in the artery and vein.

  In addition, the infrared light having a wavelength of 800 nm to 1000 nm described above preferably includes an electromagnetic wave having a wavelength difference of 100 nm or more with respect to the first electromagnetic wave.

  That is, the third electromagnetic wave includes an electromagnetic wave having a wavelength difference of 100 nm or more with respect to the first electromagnetic wave. This increases the possibility that the combination of reflection ratios is different. When the possibility increases, the difference in lightness between the artery and the vein is higher in the image obtained by the electromagnetic wave reflected from the living body. As the brightness difference increases, the number of image errors decreases. As a result, it is possible to provide an internal detection device with a high degree of freedom in installation and with fewer errors in arteries and veins.

  The internal detection device according to the present invention can increase the degree of freedom of installation and reduce errors.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<First Embodiment>
The internal detection device according to the first embodiment of the present invention will be described below.

  Referring to FIG. 1, the internal detection device according to the present embodiment includes a light source 62, a regulator 63, a drive unit 64, an image sensor 65, a sensor control unit 66, and an AD (Analog-to-Digital). ) A converter 67, a first memory 68, a difference calculation unit 69, a second memory 70, and a main control unit 71 are included. The light source 62 irradiates the human body (finger, palm, etc.) 61 with electromagnetic waves. In the case of the present embodiment, the light source 62 irradiates two types of electromagnetic waves, which are at least one type of first electromagnetic wave reflected inside the living body and have different wavelengths, one by one on the same part of the living body. The first type of the two types of electromagnetic waves is visible light (wavelength 400 to 700 nm, for example, 400 nm as an example). The second type is near infrared (wavelength 700 to 1200 nm, for example, 1000 nm as an example). The light source 62 according to the present embodiment can irradiate two types of electromagnetic waves by including two types of LEDs (Light-Emitting Diodes). The LED is suitable as an electromagnetic wave generation source of the internal detection device according to the present embodiment. This is because an LED can generate only an electromagnetic wave having a specific wavelength. The adjuster 63 adjusts the intensity of the electromagnetic wave emitted from the light source 62. The adjuster 63 according to the present embodiment can independently adjust two types of electromagnetic waves of the light source 62. The drive unit 64 controls the type and generation timing of the electromagnetic wave emitted by the light source 62. The image sensor 65 detects electromagnetic waves reflected from the human body 61 that is a living body. The image sensor 65 according to the present embodiment is a known CCD (Charge-Coupled Device). Such an image sensor can detect electromagnetic waves from visible light (wavelength of about 400 nm) to near infrared light (wavelength of about 1200 nm). There is no need to provide a different image sensor for each type of electromagnetic wave. The image sensor 65 according to the present embodiment is made of silicon. The image sensor 65 according to the present embodiment is a monochrome type image sensor. This is because in the present embodiment, it is not necessary to simultaneously detect electromagnetic waves having two or more types of wavelengths. In particular, when it is desired to obtain a polygonal image, a plurality of image sensors may be used (a case where a plurality of image sensors are used will be described later). The image sensor 65 according to the present embodiment does not include an infrared cut filter. This is because it is necessary to detect near infrared rays. The sensor control unit 66 directly controls the image sensor 65. The AD converter 67 converts the output (analog output) of the image sensor 65 into a digital output. The first memory 68 stores data of an image formed by reflected visible light and near infrared light. The difference calculation unit 69 performs processing on the data stored in the first memory 68. Specific processing contents will be described later. The second memory 70 stores data obtained as a result of processing by the difference calculation unit 69. The main control unit 71 controls the drive unit 64, the sensor control unit 66, and the difference calculation unit 69, respectively.

  Referring to FIG. 2, the program executed by the internal detection device according to the present embodiment has the following control structure for extracting a blood vessel pattern image.

  In step 100 (hereinafter, step is abbreviated as S), the main control unit 71 outputs a signal indicating that the visible light reflected from the human body 61 is detected to the driving unit 64 and the sensor control unit 66. The drive unit 64 outputs a signal that matches the intensity of visible light to the adjuster 63. The adjuster 63 adjusts the intensity of visible light emitted from the light source 62. When the intensity is adjusted, the drive unit 64 causes the light source 62 to generate visible light. Visible light generated by the light source 62 irradiates the human body 61. The sensor control unit 66 outputs a signal indicating that the visible light reflected from the human body 61 is detected to the image sensor 65. The image sensor 65 detects visible light emitted from the light source 62 and reflected from the human body 61.

  In S102, the main control unit 71 outputs a signal to the effect that the near infrared ray reflected from the human body 61 is detected to the drive unit 64 and the sensor control unit 66. The drive unit 64 outputs a signal representing the intensity of near infrared rays to the adjuster 63. The adjuster 63 adjusts the intensity of near infrared rays generated by the light source 62. The drive unit 64 causes the light source 62 to generate near infrared rays. The light source 62 irradiates the human body 61 with near infrared rays. The sensor control unit 66 outputs a signal indicating that the near-infrared ray reflected from the human body 61 is detected to the image sensor 65. The image sensor 65 detects near infrared rays that are emitted from the light source 62 and reflected from the human body 61. The AD converter 67 converts the data output from the image sensor 65 into digital data. The first memory 68 stores the data output from the AD converter 67.

  In S104, the main control unit 71 outputs a signal indicating that the reflected visible light image is compared with the reflected near-infrared image to the difference calculation unit 69. The difference calculation unit 69 reads the reflected visible light image data and the reflected near-infrared image data from the first memory 68. When the data is read, the difference calculation unit 69 compares the reflected visible light image with the reflected near-infrared image.

  In S <b> 106, the difference calculation unit 69 generates an image of a portion of the reflected visible light that is different from an image formed by the visible light that is an electromagnetic wave other than the near infrared from the image formed by the near infrared reflected from the human body 61. Created from image data and reflected near-infrared image data. For this purpose, the difference calculation unit 69 corrects the near-infrared image data so as to remove a portion common to the reflected visible light image from the reflected near-infrared image. At this time, in order to surely remove the common part, the intensity of the electromagnetic wave, the time for continuing the irradiation of the electromagnetic wave, and the time for the image sensor 65 to detect the electromagnetic wave in S100 and S102 are adjusted in advance. These values are predetermined by the manufacturer of the internal detection device. In S108, the difference calculation unit 69 causes the second memory 70 to store the reflected near-infrared image (from which the image has been removed in S106).

  The operation of the internal detection device based on the above-described structure and flowchart will be described.

  The light source 62 irradiates the human body 61 with visible light. The image sensor 65 detects visible light emitted from the light source 62 and reflected from the human body 61 (S100). FIG. 4 shows how visible light is reflected. All visible light 81 is reflected from the surface of the finger 14. When the image is captured, the light source 62 irradiates the human body 61 with near infrared rays. The image sensor 65 detects near-infrared rays that are emitted from the light source 62 and reflected from the human body 61 (S102). FIG. 5 shows how near infrared rays are reflected. A part of the near infrared ray 91 penetrates from the surface of the finger 14 to a depth of several mm. The rest is reflected by the surface of the finger 14. Near infrared rays 91 that have entered the blood vessel 15 of the finger 14 are absorbed by hemoglobin or the like. All other near infrared rays are reflected. The detection of electromagnetic waves in S100 and S102 is performed in a short time (0.1 seconds in the case of the present embodiment). This is to suppress the influence of the moving human body 61. Referring to FIG. 3, an image (1) representing the image detected at S100 and an image (2) representing the image detected at S102 are shown. In the image (2), dirt 16 and wrinkles 17 of the finger 14 appear. In the image (1), in addition to the dirt 16 and the wrinkles 17, blood vessels 15 appear. The reason why such a difference appears is the difference in the reflected position as shown in FIGS.

  When the electromagnetic wave is detected, the difference calculation unit 69 compares the reflected visible light image with the reflected near-infrared image (S104). As shown in image (1) and image (2) in FIG. 3, dirt 16 and wrinkles 17 appear in the image detected by the image sensor 65. This is because not only visible light but also near infrared light is reflected on the surface of the human body 61. All of the visible light is reflected by the surface of the human body 61. The blood vessel 15 appears in the image (1), and the blood vessel 15 does not appear in the image (2). The difference calculation unit 69 removes an image common to the reflected visible light image from the reflected near-infrared image (S106). Thereby, the image of the stain | pollution | contamination 16 and the eyelid 17 in an image (1) is removed. Image (3) is an image after they are removed. Only the blood vessel 15 appears clearly.

  When the image is removed, the difference calculation unit 69 stores the reflected near-infrared image from which the image has been removed in S106 in the second memory 70 (S108).

  As described above, the internal detection device according to the present embodiment can extract the blood vessel pattern of the human body. Visible light or infrared light reflected from the finger is used to extract the blood vessel pattern. Since reflected visible light or infrared light is used, a light source or an image sensor can be installed on one side of a finger (such as the belly side of the finger). Since there is no need to use transmitted light, the degree of freedom of installation is increased. Furthermore, the internal detection device according to the present embodiment detects visible light and infrared light, respectively. The blood vessel pattern is extracted by simply comparing an image obtained by visible light and an image obtained by infrared rays. Advanced image processing is unnecessary. There are fewer errors in the extracted blood vessel pattern. The influence of external light (ambient light) is also eliminated. As a result, it is possible to provide an internal detection device with a large degree of freedom in installation and with few errors.

  The human body 61 in contact with the guide 51 may be imaged. FIG. 6 is a diagram illustrating a process of extracting a blood vessel image when the reflected light from the human body 61 in contact with the guide 51 is detected. The guide 51 in this modification is processed according to the shape of the finger 14. Since the guide 51 restricts the movement of the human body 61, the influence of the movement of the human body 61 is suppressed. The guide 51 may be a frame that simply fixes the periphery of the finger 14.

  Further, the human body 61 may be a part other than the finger or palm of the human body such as the back of the hand. Moreover, the electromagnetic wave which the light source 62 irradiates may be three or more types. The image sensor 65 may be a complementary metal oxide semiconductor (CMOS) imager. In addition, the light source 62 may be a combination of a halogen lamp and an optical filter so as to extract an electromagnetic wave having a specific wavelength from electromagnetic waves in a wide wavelength range emitted from the halogen lamp.

  Further, as described above, a polygonal image may be obtained using a plurality of image sensors. In the case of using a plurality of image sensors, referring to FIG. 7, the internal detection device further includes an image sensor 72 and an AD converter 73. The internal detection device includes a difference calculation unit 74 instead of the difference calculation unit 69. The image sensor 72 detects electromagnetic waves reflected from the human body 61. The AD converter 73 converts the output (analog output) of the image sensor 72 into a digital output. The image sensor 65 and the image sensor 72 are arranged so as to detect electromagnetic waves reflected in different directions from the same part of the human body 61, respectively (in the case of FIG. 7, the image sensor 65 is arranged at the lower left of the human body 61, The sensor 72 is disposed at the lower right of the human body 61). In this case, the electromagnetic waves are detected at the same time (the timing for detecting the electromagnetic waves is not particularly limited). Since electromagnetic waves are detected at the same time, the sensor control unit 66 can control the image sensor 65 and the image sensor 72. In addition to the same process as the difference calculation part 69, the difference calculation part 74 performs one of the following processes. The first process is a process of forming data of one image by joining together the image data of the electromagnetic waves detected by the image sensor 65 and the image sensor 72. The second process is a process of forming three-dimensional image data of the reflected electromagnetic wave from the electromagnetic wave image data detected by the image sensor 65 and the image sensor 72 (specifically, the three-dimensional image data is The procedure for forming the image may be a procedure in which a human recognizes a solid using two eyes). Which of the first process and the second process is performed is arbitrarily determined by the designer of the internal detection device. At this time, the image data used in S106 is image data formed by the difference calculation unit 74 by either the first process or the second process. The other hardware configuration and processing flow are the same as described above. Thereby, compared with the case where one image sensor is used, the range which can detect the reflected electromagnetic wave among the human bodies 61 can be expanded, or the information obtained from a part of human body 61 can be increased.

<Second Embodiment>
An internal detection device according to the second embodiment of the present invention will be described below.

  Referring to FIG. 8, the internal detection device according to the embodiment of the present invention includes a light source 82 instead of light source 62 according to the first embodiment. The light source 82 irradiates the human body 61 with three types of electromagnetic waves. The first type of the three types of electromagnetic waves is visible light. The second type is the first near infrared ray. The wavelength of the first near infrared ray is 750 nm. The wavelength of the first near infrared ray is included in the range of 700 nm to 800 nm. The third type is the second near infrared ray. The wavelength of the second near infrared ray is 950 nm. The wavelength of the second near infrared ray is included in the range of 800 nm to 1000 nm. The wavelength difference between the first near-infrared light and the second near-infrared light is 100 nm or more. This is because the meaning of using three kinds of wavelengths is lost when the difference in wavelength is reduced. As a result, the light source 82 irradiates two or more types of electromagnetic waves, which are the first near-infrared rays reflected at the inside of the human body 61, at least one type of which is a living body, with different wavelengths, one by one on the same part of the living body. can do. The light source 82 is a combination of a halogen lamp and an optical filter. This optical filter can shield the electromagnetic waves emitted by the halogen lamp so that the generation timings of the three types of electromagnetic waves described above are different. In the present embodiment, this optical filter is controlled by the drive unit 64. The intensity of the electromagnetic wave is controlled by the adjuster 63. Other hardware configurations are the same as those in the first embodiment. The function about them is the same. Therefore, detailed description thereof will not be repeated here.

  Referring to FIG. 9, the program executed by the internal detection device has the following control structure with respect to blood vessel pattern extraction. In the flowchart shown in FIG. 9, the process shown in FIG. 2 is given the same step number. These processes are the same. Therefore, detailed description thereof will not be repeated here.

  In S202, the main control unit 71 outputs a signal indicating that the first near-infrared ray reflected from the human body 61 is detected to the drive unit 64 and the sensor control unit 66. The drive unit 64 outputs a signal representing the intensity of the first near infrared ray to the adjuster 63. The adjuster 63 adjusts the electromagnetic wave intensity of the light source 82. The drive unit 64 causes the light source 82 to irradiate the first near infrared ray. The sensor control unit 66 causes the image sensor 65 to detect the first near infrared ray reflected from the human body 61. The image sensor 65 outputs the detected data. The AD converter 67 converts the analog data output from the image sensor 65 into digital data. The first memory 68 stores the digital data output from the AD converter 67.

  In S <b> 204, the main control unit 71 outputs a signal indicating that the second near infrared ray reflected from the human body 61 is detected to the drive unit 64 and the sensor control unit 66. The drive unit 64 outputs a signal representing the intensity of the second near infrared ray to the adjuster 63. The adjuster 63 adjusts the electromagnetic wave intensity of the light source 82. The drive unit 64 causes the light source 82 to irradiate the second near infrared ray. The sensor control unit 66 causes the image sensor 65 to detect the second near infrared ray reflected from the human body 61. The image sensor 65 outputs the detected data. The AD converter 67 converts the analog data output from the image sensor 65 into digital data. The first memory 68 stores the digital data output from the AD converter 67.

  In S206, the main control unit 71 outputs a signal indicating that the reflected visible light image is compared with the reflected first near-infrared image to the difference calculation unit 69. The difference calculation unit 69 reads the reflected visible light image and the reflected first near-infrared image from the first memory 68. When the image is read, the difference calculation unit 69 compares the reflected visible light image with the reflected first near-infrared image.

  In S208, the main control unit 71 outputs a signal indicating that the reflected visible light image and the reflected second near-infrared image are compared to the difference calculation unit 69. The difference calculation unit 69 reads the visible light image reflected from the first memory 68 and the reflected second near-infrared image. When the image is read, the difference calculation unit 69 compares the reflected visible light image with the reflected second near-infrared image.

  In S210, difference calculation unit 69 corrects the data of the second near-infrared image so as to remove the portion common to the visible light image from the second near-infrared image. The difference calculation unit 69 stores the image data after the image is removed in the second memory 70.

  In S212, the difference calculation unit 69 reads from the second memory 70 the first near-infrared image (image (4)) from which the image has been removed in S106. The difference calculation unit 69 reads the second near-infrared image (image (5)) from which the image has been removed in S210 from the second memory 70. When the image is read, the difference calculation unit 69 compares the image (4) with the image (5).

  In S214, difference calculation unit 69 removes an image that is common to image (5) and appears brighter than image (5) from image (4). When the image is removed, the difference calculation unit 69 stores the image data after removing the image in the second memory 70 as the image data of the arterial pattern. The difference calculation unit 69 removes an image that is common to the image (5) and appears darker than the image (5) from the image (4). The difference calculation unit 69 stores the image data after the image is removed in the second memory 70 as vein pattern image data. As a result, the difference calculation unit 69 creates an image that represents a part of the image (4) that is common to the image (5) and that has different brightness between the image (4) and the image (5).

  The operation of the internal detection device based on the above-described structure and flowchart will be described.

  The image sensor 65 detects the first near infrared ray reflected from the human body 61 (S202). When the first near infrared ray is detected, the image sensor 65 detects the second near infrared ray (S204). The detection from the detection of visible light to the detection of the second near infrared ray is performed in a short time (within 0.1 seconds in the case of the present embodiment). Referring to FIG. 10, images (1) to (3) representing images connected by the electromagnetic waves detected at this time are shown. Image (1) represents an image formed by the first near infrared rays. Image (2) represents an image formed by visible light. Image (3) represents an image formed by the second near infrared ray.

  When the electromagnetic wave is detected, the difference calculation unit 69 compares the visible light image with the second near-infrared image (S206). When the comparison is performed, the difference calculation unit 69 corrects the data of the first near-infrared image so as to remove the portion common to the visible light image from the first near-infrared image (S106). . Thereby, the difference calculation part 69 reflected the image showing the part different from the image which the visible light which is electromagnetic waves other than the reflected 1st near infrared rays connected among the reflected images of the 1st near infrared rays. It is created from the data of the image that the electromagnetic wave connects. Image (4) in FIG. 10 shows a first near-infrared image from which a portion common to the visible light image is removed.

  The difference calculation unit 69 compares the visible light image with the second near-infrared image (S208). When the comparison is performed, the difference calculation unit 69 corrects the data of the second near-infrared image so as to remove the portion common to the visible light image from the second near-infrared image (S210). . As a result, the difference calculation unit 69 can enter the inside of the living body, and among the images formed by the reflected second near-infrared light that is different from both the reflected first near-infrared light and the visible light, the image connected by the visible light is An image representing a different part is created from data of an image formed by reflected electromagnetic waves. An image (5) shown in FIG. 10 shows a second near-infrared image in which a portion common to the visible light image reflected at this time is removed.

  The difference calculation unit 69 compares the image (4) and the image (5) (S212). With reference to FIG. 11, the reason why a difference appears between the image (4) and the image (5) will be described. FIG. 11 is a diagram showing the absorptance of hemoglobin flowing through blood vessels with respect to light (wavelength: 600 nm to 1000 nm). The horizontal axis in FIG. 11 indicates the wavelength of light. The vertical axis represents the absorption rate. This figure shows that hemoglobin absorbs infrared light. Due to the property that this hemoglobin absorbs infrared rays, near-infrared rays irradiated to a portion without blood vessels are reflected. The reflected near infrared ray is detected by the image sensor 65. Near-infrared rays irradiated to a part where a blood vessel is present are absorbed. It is not detected by the image sensor 65. As a result, a portion without blood vessels appears brightly in the image detected by the image sensor 65. In the image detected by the image sensor 65, a portion having a blood vessel appears dark. Moreover, the absorption rate of oxygenated hemoglobin and the absorption rate of reduced hemoglobin differ depending on the wavelength of near infrared rays. For near infrared rays in the range from 700 nm to 800 nm (particularly around 750 nm), the absorption rate of reduced hemoglobin is higher than that of oxyhemoglobin. For near infrared rays in the range from 800 nm to 1000 nm, the absorption rate of oxyhemoglobin is higher than the absorption rate of reduced hemoglobin. Oxyhemoglobin is oxygen-containing hemoglobin. Oxyhemoglobin is abundant in arterial blood. Reduced hemoglobin is hemoglobin that does not contain oxygen. Reduced hemoglobin is abundant in venous blood. As a result, in the near-infrared image in the range from 700 nm to 800 nm (particularly around 750 nm), the artery image appears brighter than the vein image. In the near infrared image in the range from 800 nm to 1000 nm, the vein image appears brighter than the arterial image. Thereby, a difference appears in the image (4) and the image (5). By comparing image (4) and image (5), a diagram of the arterial pattern is obtained. A diagram of the vein pattern is also obtained. When the wavelength images are compared, the difference calculation unit 69 creates a vein pattern diagram (S214). An image (6) of FIG. 10 shows a vein pattern. The difference calculation unit 69 creates an arterial pattern image. An image (7) shown in FIG. 10 shows a diagram of an arterial pattern.

  As described above, the internal detection device according to the present embodiment can extract an arterial pattern and a vein pattern. In extracting these patterns, reflected light is used. Transmitted light is not used. Thereby, the freedom degree of an installation becomes large. As a result, an internal detection device that can increase the degree of freedom of equipment can be provided.

  The light source 82 may be an LED that can generate an electromagnetic wave having a specific wavelength.

  The pattern may be extracted using four or more types of electromagnetic wave images.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a control block diagram of the internal detection apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the procedure of control of the pattern extraction process which concerns on the 1st Embodiment of this invention. It is a figure which shows the image which the internal detection apparatus concerning the 1st Embodiment of this invention acquired. It is a schematic diagram which shows reflection of visible light. It is a schematic diagram which shows the reflection by near infrared rays. It is a figure showing the process of extracting the image of the human body which contact | connected the guide which concerns on the modification of the 1st Embodiment of this invention. It is a control block diagram of the internal detection apparatus which concerns on the modification of the 1st Embodiment of this invention. It is a control block diagram of the internal detection apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the procedure of control of the pattern extraction process which concerns on the 2nd Embodiment of this invention. It is a figure which shows the image which the internal detection apparatus based on the 2nd Embodiment of this invention acquired. It is a figure which shows the light absorbency of the hemoglobin in blood.

Explanation of symbols

  14 Finger, 15 Blood vessel, 16 Dirt, 17 皺, 51 Guide, 61 Human body, 62, 82 Light source, 63 Adjuster, 64 Drive unit, 65, 72 Image sensor, 66 Sensor control unit, 67, 73 AD converter, 68 First memory, 69, 74 Difference calculation unit, 70 Second memory, 71 Main control unit, 81 Visible light, 91 Near infrared ray.

Claims (6)

An irradiating means for irradiating two or more types of electromagnetic waves, which are at least one type of first electromagnetic wave reflected inside the living body and having different wavelengths, one by one on the same part of the living body;
Detection means for detecting electromagnetic waves reflected from the living body;
Storage means for storing image data connected by the reflected electromagnetic wave;
Data of an image formed by connecting the reflected electromagnetic wave to an image of a portion different from an image formed by connecting a second electromagnetic wave, which is an electromagnetic wave other than the first electromagnetic wave, among images formed by the first electromagnetic wave reflected inside the living body. An internal detection device comprising: creation means for creating from The first electromagnetic wave includes infrared;
The internal detection device according to claim 1, wherein the second electromagnetic wave includes visible light.   The internal detection device according to claim 2, wherein the infrared rays include infrared rays having any wavelength from 700 nm to 1000 nm. An irradiating means for irradiating two or more types of electromagnetic waves, which are at least one type of first electromagnetic wave reflected inside the living body and having different wavelengths, one by one on the same part of the living body;
Detection means for detecting electromagnetic waves reflected from the living body;
First storage means for storing image data connected by the reflected electromagnetic wave;
A first image representing a portion different from an image connected by a second electromagnetic wave, which is an electromagnetic wave other than the first electromagnetic wave, among images connected by the first electromagnetic wave is obtained from data of an image connected by the reflected electromagnetic wave. First creating means for creating;
A second image representing a portion different from an image connected by the second electromagnetic wave among images connected by a third electromagnetic wave that can enter the living body and is different from both the first electromagnetic wave and the second electromagnetic wave. Second creation means for creating from the data of the image connected by the reflected electromagnetic wave;
Second storage means for storing either the first image or the second image;
A third creation unit for creating an image that represents a part of the first image that is common to the second image and that has different brightness between the first image and the second image; , Internal detection device. The first electromagnetic wave includes an infrared ray having a wavelength of 700 nm to 800 nm,
The internal detection device according to claim 4, wherein the third electromagnetic wave includes an infrared ray having a wavelength of 800 nm to 1000 nm.   6. The internal detection device according to claim 5, wherein the infrared light having a wavelength of 800 nm to 1000 nm is an electromagnetic wave having a wavelength difference of 100 nm or more with respect to the first electromagnetic wave.

Images