JP2009053160A - Dental colorimetric device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dental colorimetric device capable of selecting therapeutic supporting information of prosthetic material and the like suitable for the color of patient's teeth. <P>SOLUTION: The dental colorimetric device includes a color sample information storage section 114, where a plurality of information groups including colorimetric information, which, while having stereoscopic teeth figuration, is acquired from denture mold color samples with layered structure responding to the sites and therapeutic supporting information are memorized according to the sites, an imagery data acquisition section for acquiring imagery data of patient's teeth, a site setting section 81 for configuring target sites, a comparative information extraction section 82 for extracting the information group coordinated with target sites, a teeth information extraction section 83 for extracting colorimetric information for target sites based on the imagery data of patient's teeth, a color comparison section 84 for comparing colorimetric information extracted of a plurality of information groups with colorimetric information of target sites of patient's teeth, and an information selecting section 85 selecting at least one information group based on comparison result. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dental colorimetric device that assists in selecting a prosthetic material and the like when a cavity formed in a patient's tooth is compensated.

Conventionally, a composite resin has been used as a prosthetic material for filling a cavity formed in a tooth by caries or the like. When filling the composite resin, for example, the doctor visually compares the color of the patient's tooth with the color of the color sample, and selects the color sample having the color closest to the patient's tooth. Each color sample is provided with a table that specifies the recommended combination color of the composite resin to be filled, and the doctor selects the color of the composite resin to be filled with reference to the table corresponding to the selected color sample and treats it. Do. Here, the color sample is, for example, a material in which different colored ceramics are processed into a tooth shape.
In addition, in order to reduce the burden on the doctor related to the selection of the color swatches described above, a technology for automatically selecting the color swatch that has the closest color tone to the tooth, thereby supporting the color selection of the prosthetic material Has been proposed.

For example, in Japanese Patent Laid-Open No. 2002-90223, a large number of reference templates composed of a number of combinations of different layer thicknesses and color schemes are photographed, and numerical values relating to predetermined parameters obtained from the image data are stored in a database. Then, a color determination device that measures and determines the layer structure of the prosthetic material based on the image of the patient's tooth by comparing the color data of the patient's tooth and the color data of the reference template stored in the database is proposed. Has been.
JP 2002-90223 A

  However, in the invention disclosed in Patent Document 1, since the database is accumulated based on the image data acquired from the planar color sample, the inside of the translucent layer due to the three-dimensional shape of the tooth itself. The prosthetic material cannot be selected in consideration of light wraparound or color reflection, and treatment marks stand out against the assumption when treatment is performed using the actually selected prosthetic material. was there.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a dental colorimetric device capable of selecting treatment support information such as a prosthetic material suitable for the color of a patient's tooth. .

In order to solve the above problems, the present invention employs the following means.
In the present invention, a plurality of information groups including colorimetric information and treatment support information acquired from a tooth-type color sample having a three-dimensional tooth shape and a layer structure corresponding to a part are associated with the part. Storage means, image data acquisition means for acquiring image data of a patient's tooth, and part setting means for setting a target part for comparing the color of the patient's tooth and the color of the tooth type color sample And comparison information extraction means for extracting the information group associated with the target part from the storage means, and colorimetric information on the target part set by the part setting means based on image data of the patient's teeth A color ratio for comparing the colorimetric information of the plurality of information groups extracted by the comparison information extraction unit and the colorimetric information of the patient's teeth extracted by the tooth information extraction unit There is provided a dental colorimetric apparatus comprising: means for selecting at least one information group from among a plurality of information groups extracted by the information extracting means based on a comparison result by the color comparing means. .

According to the present invention, colorimetric information is acquired from a tooth-type color sample having a three-dimensional tooth shape and a layer structure corresponding to a part, and this colorimetric information and treatment support information are associated with each part. And stored in the storage means. Then, the information group associated with the target part set by the part setting means is extracted by the comparison information extracting means, and the colorimetric information of the patient's tooth in the target part is extracted by the tooth information extracting means, and the color It is transferred to the comparison means. The color comparison unit compares the color measurement information of the tooth type color sample in the target part with the color measurement information of the patient's tooth, and at least one information group is selected by the information selection unit based on the comparison result. In this way, in the present invention, colorimetric information is obtained from a tooth-type color sample having a three-dimensional tooth shape and a layer structure corresponding to the part, so that light in the translucent layer of the tooth itself can be obtained. It is possible to obtain colorimetric information in consideration of wraparound or color reflection. Thereby, the reproducibility of the color of the tooth-type color sample can be improved, and it is possible to select appropriate treatment support information that matches the color of the patient's tooth.
The treatment support information refers to, for example, various information necessary for a doctor to fill a prosthesis material into a cavity formed in a patient's tooth. For example, the layer structure of each part of a tooth-type color sample , Material information of each layer, thickness, and the like.

  The dental colorimetric device includes a display unit that displays an image of the patient's tooth, and an input unit, and the part setting unit is arranged on the image displayed on the display unit via the input unit. The part to which the comparison region specified by the user belongs may be set as the target part.

  In the dental colorimetric apparatus, the part setting means may specify the position of the cavity in the image data of the patient's tooth and set the part to which the cavity belongs as a target part.

  By doing in this way, since a target part is set up automatically, it becomes possible to reduce a burden of users, such as a doctor.

  In the dental colorimetric device, the part is subdivided into a plurality of small areas, and the colorimetric information constituting the information group is stored in the storage means in units of the small areas, and the comparing means May compare the colorimetric information of the information group in the target part and the colorimetric information of the patient's teeth for each small region in the target part.

  Since the colorimetric information is compared for each small region in this way, the accuracy of color comparison can be improved.

  In the dental colorimetric device, the plurality of small regions may include a region of interest to be treated and a region around the region of interest.

  By doing in this way, color comparison can be performed for each of the region of interest to be treated in the target region and the surrounding region. Since an actual tooth has a structure including a translucent layer, light from a region around the region of interest may cause a unique color in the region to be reflected in the region of interest. Therefore, by comparing the colorimetric information not only in the region of interest but also in the surrounding region, it is possible to obtain colorimetric information in which the influence of the inherent color and layer structure in the surrounding region is taken into account. As a result, it is possible to improve the accuracy of selecting appropriate treatment support information that matches the color of the patient's teeth.

  In the dental colorimetric apparatus, color sample image data is obtained by photographing a tooth-type color sample having a tooth shape and a layer structure corresponding to a part, and the colorimetric information is obtained from the color sample image data. It is good also as acquiring.

  In the dental colorimetric device, a cavity is formed in each part of the tooth-shaped color sample having an actual tooth shape, and the prosthetic material is filled with a layer structure corresponding to the part with respect to the cavity, after the prosthetic material is filled The colorimetric information may be acquired in association with the treatment support information from the tooth type color sample.

  As described above, since the cavity is actually filled with the prosthetic material in the cavity and the colorimetric information is obtained from the filled tooth mold color sample in association with the treatment support information. It is possible to select treatment support information suitable for a treatment form that forms a cavity.

  In the dental colorimetric device, the color sample image data may be acquired by performing imaging in a state where the tooth type color sample is mounted on a pseudogingiva.

  In the dental colorimetric device, the color sample image data may be acquired by performing imaging in a state where adjacent teeth are arranged on both sides of the tooth type color sample.

  In this way, it is possible to photograph the tooth-type color sample in a state substantially equivalent to that in the actual oral cavity. Thereby, it is possible to further improve the reliability of the colorimetric information.

  In the dental colorimetric device, after filling the prosthetic material in a layer structure corresponding to the site in the cavity formed in the patient's tooth, the patient's individual color sample image data is acquired and acquired by photographing the tooth. Colorimetric information may be acquired from the color sample image data, the colorimetric information and information related to the treatment may be associated with each other, and the information group may be created and stored in the storage unit.

  In this way, the patient's own teeth after the prosthetic material is filled in the cavity are imaged, and the colorimetric information obtained from the image data is associated with the information on the treatment actually performed to create an information group. Therefore, it is possible to make various information constituting the information group highly reliable information. This makes it possible to perform treatment with treatment support information that matches the patient's teeth.

  According to the present invention, it is possible to select treatment support information such as a prosthetic material suitable for the color of a patient's tooth.

Hereinafter, an embodiment of a dental colorimetric system of the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIGS. 1 and 4, the dental color measurement system according to the first embodiment of the present invention includes an imaging device 1, a cradle 2, a dental color measurement device 3, and a display device 4. ing.

The imaging device 1 includes a light source 10, an imaging unit 20, an imaging control unit 30, a display unit 40, and an operation unit 50 as main components as shown in FIG.
The light source 10 is disposed in the vicinity of the tip of the photographing apparatus 1 and emits illumination light having four or more different wavelength bands for illuminating the subject. For example, the light source 10 includes seven light sources 10a to 10g that emit light in different wavelength bands. Each of the light sources 10a to 10g includes four LEDs. As shown in FIG. 2, the central wavelengths of the light sources 10a are about 450 nm, the light source 10b is about 465 nm, the light source 10c is about 505 nm, and the light source 10d is about 525 nm. The light source 10e is about 575 nm, the light source 10f is about 605 nm, and the light source 10g is about 630 nm. The emission spectrum information of the LED is stored in the LED memory 11 and used in the dental color measuring device 3 described later.

  These light sources 10a to 10g are provided in a plurality of groups, for example. Each group is disposed at a position facing the imaging unit 20. The arrangement is not particularly limited, and for example, four LEDs may be arranged in the order of short wavelength, reverse order or random arrangement, or the like. In addition to the arrangement in which the LEDs are divided into a plurality of groups, all the LEDs may be arranged so as to form one ring surrounding the imaging unit 20. In addition, as long as the LED arrangement does not hinder imaging by the imaging unit 20 described later, an appropriate arrangement such as a linear arrangement, a ring arrangement, a cross arrangement, a rectangular arrangement, or a random arrangement is adopted. It is possible. The light emitting element of the light source 10 is not limited to an LED, and for example, a semiconductor laser such as an LD (laser diode) or other light emitting elements can be used.

  In the imaging apparatus 1, an illumination optical system for irradiating illumination light from the light source 10 onto the subject surface substantially uniformly is provided on the subject side of the light source 10. A temperature sensor 13 for detecting the temperature of the LED is provided in the vicinity of the light source 10.

  The imaging unit 20 includes an imaging lens 21, an RGB color imaging device 22, a signal processing unit 23, and an AD converter 24. The imaging lens 21 forms a subject image irradiated with the light source 10. The RGB color image sensor 22 captures a subject image formed by the imaging lens 21 and outputs an image signal. The RGB color image pickup element 22 is constituted by, for example, a CCD, and the sensor sensitivity is such that it substantially covers the visible wide area. This CCD may be a monochrome type or a color type. The RGB color image sensor 22 is not limited to a CCD, and a CMOS type or other various image sensors can be widely used.

  The signal processing unit 23 performs gain correction, offset correction, and the like on the analog signal output from the RGB color image sensor 22. The A / D converter 24 converts the analog signal output from the signal processing unit 23 into a digital signal. A focus lever 25 for adjusting the focus is connected to the imaging lens 21. The focus lever 25 is for manually adjusting the focus, and a position detection unit 26 for detecting the position of the focus lever 25 is provided.

  The imaging control unit 30 includes a CPU 31, an LED driver 32, a data I / F 33, a communication I / F controller 34, an image memory 35, and an operation unit I / F 36. Each of these units is connected to the local bus 37 and is configured to be able to exchange data via the local bus 37.

  The CPU 31 controls the imaging unit 20, records the subject spectral image acquired and processed by the imaging unit 20 in the image memory 35 via the local bus 37, and outputs it to the LCD controller 41 described later. The LED driver 32 controls light emission of various LEDs included in the light source 10. The data I / F 33 is an interface for receiving the contents of the LED memory 11 provided in the light source 10 and the information of the temperature sensor 13. The communication I / F controller 34 is connected to a communication I / F contact 61 serving as a connection point with the outside, and has a function for realizing communication compliant with USB 2.0, for example. The operation unit I / F 36 is connected to various operation buttons provided in the operation unit 60 described later, and functions as an interface for transferring an input instruction input via the operation unit 50 to the CPU 31 via the local bus 37. The image memory 35 temporarily records image data captured by the imaging unit 20. In the present embodiment, the image memory 35 has a memory capacity capable of recording at least seven spectral images and one RGB color image.

  The display unit 40 includes an LCD controller 41 and an LCD 42. The LCD controller 41 causes an LCD (liquid crystal display) 42 to display an image based on the image signal transferred from the CPU 31, for example, an image currently captured by the imaging unit 20 or an already captured image. At this time, if necessary, the image pattern stored in the overlay memory 43 may be superimposed on the image acquired from the CPU 31 and displayed on the LCD 42. Here, the image pattern recorded in the overlay memory 43 is, for example, a horizontal line that captures the entire tooth horizontally, a cross line that intersects this, an imaging mode, an identification number of the tooth to be imaged, or the like. .

  The operation unit 50 includes various operation switches and operation buttons for a user to input an instruction to start a spectral image shooting operation and to input an instruction to start and end a moving image shooting operation. Specifically, a shooting mode changeover switch 51, a shutter button 52, a viewer control button 53, and the like are provided. The shooting mode switch 51 is a switch for switching between normal RGB shooting and multiband shooting. The viewer control button 53 is a switch for performing operations such as changing the image displayed on the LCD 42.

  Moreover, the imaging device 1 is equipped with a lithium battery 60 as a storage battery. The lithium battery 60 is used to supply power to each unit included in the imaging apparatus 1 and is connected to a connection contact 62 that is a contact for charging. Further, a battery LED 63 for notifying the charging state of the lithium battery is provided. In addition, the imaging apparatus 1 is provided with a power LED 64 for notifying the camera state and an alarm buzzer 65 for notifying danger during photographing.

The battery LED 63 includes, for example, three LEDs of red, yellow, and green, notifies that the charging capacity of the lithium battery 60 is sufficient by lighting in green, and in other words, indicates that the battery capacity is low by lighting in yellow. The fact that charging is necessary is notified, and the fact that the battery capacity is extremely low by lighting in red, in other words, the fact that urgent charging is required is notified.
The power LED 64 includes, for example, two LEDs of red and green, and notifies that the preparation for shooting is completed by lighting in green, and that the preparation for shooting (initial warming, etc.) is in progress by blinking green. Then, it is notified that the battery is being charged by lighting in red.
The alarm buzzer 65 notifies that the captured image data is invalid by warning.

  The cradle 2 that supports the imaging device 1 described above includes a color chart 100 for calibrating the imaging unit 20, a micro switch 101 for confirming whether the imaging device 1 is mounted at a normal position, The power supply 102 for turning on / off the power, the power lamp 103 which is turned on / off in conjunction with the on / off of the power switch 102, and the light on / off in conjunction with the microswitch 101, the imaging apparatus 1 A mounting lamp 104 for notifying whether or not the camera is mounted at the normal position is provided.

  For example, when the imaging apparatus 1 is mounted at a normal position, the mounting lamp 104 is lit green, and when it is not mounted, the mounting lamp 104 is lit red. In addition, the cradle 2 is provided with a power connection connector 105 to which an AC adapter 106 is connected. Then, when the charging capacity of the lithium battery 60 included in the imaging device 1 is reduced and the yellow or red of the battery LED 63 is lit, charging of the lithium battery is started when the imaging device 1 is mounted on the cradle. It is configured as follows.

  In the imaging device 1 of the dental colorimetry system configured in this way, illumination light of four or more wavelength bands (illumination light of four or more primary colors) is sequentially irradiated onto the subject, and the number of wavelength bands of the illumination light is determined. In addition to multiband imaging for capturing the same number of subject spectral images as still images, it is also possible to capture RGB images. As one of the methods for capturing RGB images, as in a normal digital camera, there is no illumination light of the seven primary colors, and an RGB color CCD having an object illuminated by natural light or room light is used. Imaging is performed. Also, each of one or more illumination lights from the seven primary colors can be selected as RGB three-color illumination lights, and these can be sequentially irradiated to capture a frame sequential still image. ing.

Among these imaging modes, RGB imaging is used when imaging a wide area, such as when imaging the entire patient's face or when imaging the entire jaw. On the other hand, multiband imaging is used when measuring the color of one or two teeth of a patient accurately, that is, when measuring the color of teeth.
The tooth color measurement processing by multiband imaging, which is a characteristic part of the present invention, will be described below.

[Multiband shooting]
First, the imaging device is lifted from the cradle 2 by a doctor, and a contact cap is attached to an attachment port (not shown) provided on the projection port side of the housing of the imaging device. The contact cap is formed in a substantially cylindrical shape from a flexible material.

  Subsequently, when the photographing mode is set to the “colorimetry mode” by the doctor, the subject image is displayed on the LCD 42 as a moving image. While confirming the image displayed on the LCD 42, the doctor positions the patient's tooth to be measured at an appropriate position in the imaging range, and performs focus adjustment using the focus lever 25. At this time, since the contact cap is formed in a shape that guides the tooth to be measured to an appropriate photographing position, positioning can be easily performed.

  When the doctor presses the shutter button 52 in a state where the positioning and focus adjustment have been performed, a signal to that effect is transferred to the CPU 31 via the operation unit I / F 36, and multiband imaging is executed under the control of the CPU 31. Is done.

  In multi-band imaging, the LED driver 32 sequentially drives the light sources 10a to 10g, so that LED irradiation light having different wavelength bands is sequentially irradiated onto the subject. The reflected light of the subject is imaged on the surface of the RGB imaging element 22 of the imaging unit 20 and is captured as an RGB image. The captured RGB image is transferred to the signal processing unit 23. The signal processing unit 23 performs predetermined image processing on the input RGB image signal and selects predetermined one-color image data corresponding to the wavelength bands of the light sources 10a to 10g from the RGB image signal. Specifically, the signal processing unit 23 selects B image data from the image signals corresponding to the light sources 10a and 10b, selects G image data from the image signals corresponding to the light sources 10c to 10e, and selects the light sources 10f and 10f. R image data is selected from the image signal corresponding to 10g. In this manner, the image processing unit 23 selects image data having a wavelength that substantially matches the center wavelength of the irradiation light.

The image data selected by the signal processing unit 23 is transferred to the A / D converter 24 and recorded in the image memory 35 via the CPU 31. As a result, an image of a color selected from the RGB image corresponding to the center wavelength of the LED is recorded in the image memory 35 as multiband image data. That is, the multiband image data is data obtained by capturing an image of a color corresponding to the center wavelength of each primary color included in the illumination light from the light source 10 for each of a plurality of primary colors. When photographing, the CPU 31 controls the irradiation time of the LED, the irradiation intensity, the electronic shutter speed of the image sensor, etc. so that the photographing of each wavelength is properly exposed, and the temperature change during the photographing is severe. In this case, the alarm buzzer 65 sounds and issues a warning.
Further, a tooth image is further photographed without irradiating the LED, and is recorded in the image memory 35 as external light image data.

Subsequently, when the imaging is finished and the imaging device 1 is placed on the cradle 2 by the doctor, the calibration image data is measured.
The calibration image data is measured by photographing the color chart 100 by the same procedure as the above-described multiband photographing. As a result, the multiband image data of the color chart 100 is recorded in the image memory 35 as color chart image data.
Subsequently, the color chart 100 is shot in a state where the LED is not lit at all (under dark), and this image data is recorded in the image memory 35 as dark current image data. Note that this dark current image data may be obtained by performing image capturing a plurality of times and averaging the image data.

  Subsequently, signal correction using the external light image data and dark current image data recorded in the image memory 35 is performed on each of the multiband image data and the color chart image data. The signal correction for the multiband image data is performed, for example, by subtracting the signal value of the external light image data for each pixel from the image data of the multiband image data, thereby removing the influence of external light during shooting. be able to. Similarly, signal correction for color chart image data is performed, for example, by subtracting the signal value of dark current image data for each pixel from the image data of color chart image data, and the darkness of the CCD, which changes with temperature. Current noise removal can be performed.

FIG. 3 shows an example of the signal correction result for the color chart image data. In FIG. 3, the vertical axis indicates the sensor signal value, the horizontal axis indicates the input light intensity, the solid line indicates the original signal before correction, and the broken line indicates the signal after signal correction.
The multiband image data and the color chart image data after the signal correction is performed in this manner are used for the dental colorimetric device 3 via the local bus 37, the communication I / F controller 34, and the communication / I / F contact 61. And recorded in the multiband image memory 110 in the dental colorimetric device 3 shown in FIG.

  Note that the multiband image data and dark current image data of the color chart 100 are not recorded in the image memory 35 in the image pickup apparatus 1, but the local bus 37, the communication I / F controller 34, and the communication / I / F contact point. The configuration may be such that the data is directly transmitted to the dental colorimetric device 3 via 61 and recorded in the multiband image memory 110 in the dental colorimetric device 3. In this case, the signal correction described above is performed in the dental color measuring device 3.

[Dental color measuring device]
As shown in FIG. 4, the dental colorimetric device 3 is composed of, for example, a personal computer, and multiband image data and color chart image data output via the communication I / F contact 61 of the imaging device 1. And processing the multiband image data in various ways to create image data with advanced color reproduction of the subject's teeth and treatment of prosthetics suitable for the cavity of the patient's teeth Support information is selected, and the selected treatment support information is displayed on the monitor 4. The dental colorimetric device 3 is connected to the input device 5 and selects treatment support information suitable for the patient's teeth based on information input via the input device 5 by the user.

  The dental colorimetric device 3 includes an RGB image memory 111 that records RGB color image data input from the imaging device 1, a multiband image memory (image data acquisition means) 110 that stores multiband image data, and multiband image data. The chromaticity calculation unit 70 for calculating the chromaticity of the color sample information, the color sample information storage unit (storage means) 114 in which the color sample information is stored, and the color sample information stored in the color sample information storage unit 114 A color sample selection unit 80 that selects treatment support information suitable for the color of the tooth, an image display control unit 115 that controls the display content of the monitor 4, and a color that generates color image data based on signals from the chromaticity calculation unit 70 An image filing unit 113 in which various parameters such as the image creation processing unit 112 and the imaging apparatus 1 are stored as a main configuration.

The multiband image memory 110 is for holding multiband image data and color chart image data acquired by the imaging apparatus 1. The RGB image memory 111 is for holding RGB color image data acquired by the imaging apparatus 1.
The chromaticity calculation unit 70 includes a spectrum estimation calculation unit 71, an observation spectrum calculation unit 72, and a chromaticity value calculation unit 73.

  In the chromaticity calculation unit 70, the spectrum estimation calculation unit 71 uses the multiband image data and the color chart image data held in the multiband image memory 110, and uses the spectrum of the multiband image data (in this embodiment, the spectral spectrum). (Reflectance spectrum) estimation processing and the like are performed.

  The observation spectrum calculation unit 72 multiplies the tooth spectrum calculated by the spectrum estimation calculation unit by the illumination light S (λ) to be observed to obtain the spectrum of the subject under the illumination light to be observed. S (λ) is a light source for observing the color of the tooth, such as a D65 or D55 light source or a fluorescent light source, and this data is stored in the image filing unit 113 in advance.

The chromaticity value calculator 73 calculates L ^* a ^* b ^* which is a chromaticity value from the spectrum of the subject under the illumination light to be observed. Specifically, the chromaticity value calculation unit 73 averages the chromaticity values L ^* a ^* b ^* for each tooth part, and associates the result with the part to display the image display control unit 115 and the color sample selection unit 80. Output to. In this embodiment, as shown in FIG. 5, each part is set to three parts, a gum part, a center part, and a cutting edge part.

  On the other hand, the spectrum G (x, y, λ) of the subject under illumination light to be observed is sent to the color image creation processing unit 112. The color image creation processing unit 112 creates RGB2 (x, y), which is RGB image data to be displayed on the monitor 4, and outputs it to the image display control unit 115. Note that the color image creation processing unit 112 may perform image processing such as contour enhancement.

Next, the color sample information storage unit 114 will be described.
In the color sample storage unit 114, colorimetric information (in this embodiment, average chromaticity value) and treatment support information acquired based on a tooth-type color sample having a tooth shape and a layer structure corresponding to the site. Is stored for each tooth color sample in association with each part. In the present embodiment, as described above, the tooth is divided into three parts including a gum part, a central part, and a cutting edge part (see FIG. 5).

The information stored in the color sample information storage unit 114 is acquired as follows.
First, a large number of tooth type color samples having an actual tooth shape and a layer structure corresponding to each part are prepared. This color sample simulates the structure of a human tooth. For example, the gum part is formed in a two-layer structure, the central part is formed in a three-layer structure, and the incision part is formed in a four-layer structure. The combinations of thickness and color are different from each other.

  Subsequently, multi-band image data is acquired by photographing these tooth-shaped color samples with the imaging device 1 described above. The acquired multiband image data is recorded in the multiband image memory 110 in the dental colorimetric device 3 together with the color chart image data, and then transferred to the chromaticity calculation unit 70. In the chromaticity calculation unit 70, each process is performed using the multiband image data and color chart image data of the tooth-type color sample, and RGB color image data under a predetermined illumination is created by the color image creation processing unit 112. The average chromaticity value in each part is calculated by the chromaticity value calculation unit 73. The RGB color image data of the tooth type color sample and the average chromaticity value of each part are transferred to the color sample selection unit 80.

  On the other hand, the ID number of the tooth shape color sample and treatment support information are input from the input device 5 simultaneously with the photographing of the tooth shape color sample. The treatment support information refers to various information necessary for a doctor to fill a prosthesis material into a cavity formed in a patient's tooth. For example, the layer structure of each part of a tooth-type color sample, It consists of material information, thickness, etc.

The color sample selection unit 80 receives the average chromaticity value (colorimetric information) received from the chromaticity calculation unit 70, the RGB color image data received from the color image creation processing unit 112, and the tooth pattern color received from the input device 5. A set of color sample information relating to the tooth type color sample is created by associating the sample ID number with the treatment support information, and this is stored in the color sample information storage unit 114.
FIG. 6 is a diagram illustrating an example of a set of color sample information identified by the ID number “0001” stored in the color sample information storage unit 114. In the present embodiment, the average chromaticity value for each part in the set of color sample information and the treatment support information are defined as a set of information. In this embodiment, since the tooth is divided into three parts including a gum part, a center part, and a cutting edge part, one set of color sample information is composed of three information groups.

Next, the color sample selection unit 80 will be described with reference to FIG. FIG. 7 is a functional block diagram of the color sample selection unit 80. As shown in FIG. 7, the color sample selection unit 80 includes a part setting unit (part setting unit) 81 that sets a target part for comparing a patient's tooth and a color sample, and an information group associated with the target part. Corresponding to the target part set by the part setting part 81 from the average chromaticity value of each part of the patient's tooth and the comparison information extracting part (comparison information extracting means) 82 that extracts the color sample information from the color sample information storage part 114 A tooth information extracting unit (tooth information extracting means) 83 for extracting an average chromaticity value, and an average chromaticity value of a plurality of information groups extracted by the comparison information extracting unit 82 and the patient information extracted by the tooth information extracting unit 83 A color comparison unit (color comparison unit) 84 that compares the average chromaticity values of the teeth, and at least one of a plurality of information groups extracted by the comparison information extraction unit 82 based on the comparison result by the color comparison unit 84 Information selection to select information group Parts and a (information selecting means) 85.
The information group selected by the information selection unit 85 is output to the image display control unit 115 together with the RGB color image of the color sample.
The image display control unit 115 displays information input from each unit on the monitor 4.

Next, the process executed by the dental color measuring device 3 according to this embodiment will be described in detail.
First, the patient's teeth are imaged by the imaging device 1 in a multiband, and the multiband image data is transferred to the dental colorimetric device 3 together with the color chart image data and recorded in the multiband image memory 110. The multiband image data and the color chart image data captured in the multiband image memory 110 are transferred to the chromaticity calculation unit 70.

In the chromaticity calculation unit 70, first, spectrum estimation calculation unit 71 performs spectrum (in this embodiment, spectrum of spectral reflectance) estimation processing and the like.
As shown in FIG. 8, the spectrum estimation calculation unit 71 includes a conversion table creation unit 711, a conversion table 712, an input γ correction unit 713, a pixel interpolation calculation unit 714, an in-plane unevenness correction unit 715, a matrix calculation unit 716, and a spectrum. An estimation matrix creating unit 717 is provided.
The input γ correction unit 713 and the pixel interpolation calculation unit 714 are individually provided for each of the multiband image data and the color chart image data. Specifically, an input γ correction unit 713a and a pixel interpolation calculation unit 714a are provided for multiband image data, and an input γ correction unit 713b and a pixel interpolation calculation unit 714b are provided for color chart image data. .

  In the spectrum estimation calculation unit 71 having such a configuration, the multiband image data and the color chart image data are respectively transferred to the separately provided input γ correction units 713a and 713b, and after the input γ correction is performed. The pixel interpolation calculation units 714a and 714b perform image interpolation calculation processing. The signals after these processes are transferred to the in-plane unevenness correction unit 715, where the in-plane unevenness correction processing of the multiband image data using the color chart image data is performed. Thereafter, the multiband image data is transferred to the matrix calculation unit 716, and the spectral reflectance is calculated using the matrix created by the spectrum estimation matrix creation unit 717.

Hereinafter, each image processing performed in each unit will be specifically described.
First, a conversion table 712 is created by the conversion table creation unit 711 as a pre-stage of input γ correction. Specifically, the conversion table creation unit 711 has data in which the input light intensity is associated with the sensor signal value, and creates the conversion table 712 based on these data. The conversion table 712 is created from the relationship between the input light intensity and the output signal value. For example, as shown by the solid line in FIG. 9A, the input light intensity and the sensor signal value are approximately proportional to each other. Created to be

  Each input γ correction unit 713a, 713b performs input γ correction on the multiband image data and color chart image data by referring to the conversion table 712. This conversion table is created so that an input light intensity D corresponding to the sensor value A at the present time is obtained, and an output sensor value B corresponding to the input light intensity D is output. As a result, the conversion table shown in FIG. It becomes like this. In this way, when the input γ correction is performed on the multiband image data and the color chart image data, the corrected image data is transferred to the pixel interpolation calculation units 714a and 714b, respectively.

  In the pixel interpolation calculation units 714a and 714b, pixel interpolation is performed by applying a low-pass filter to each of the multiband image data and color chart image data after the input γ correction. FIG. 10 shows an example of a low-pass filter applied to the R signal and the B signal. FIG. 11 shows a low-pass filter applied to the G signal. By multiplying each multiband image data by such a low-pass filter for pixel interpolation, for example, an image of 144 pixels × 144 pixels is changed to an image of 288 pixels × 288 pixels.

The multiband image data g _k (x, y) that has undergone the image interpolation calculation is transferred to the in-plane unevenness correction unit 715. The in-plane unevenness correction unit 715 corrects the luminance at the center of the screen of the multiband image data using the following equation (1).

In the above equation (1), c _k (x, y) is color chart image data, g _k (x, y) is multiband image data after input γ correction, and (x ₀ , y ₀ ) is the center pixel position. , Δ (= 5) is the area average size, and g ′ _k (x, y) is the multiband image data after in-plane unevenness correction (where k = 1,..., N (number of bands)). The in-plane unevenness correction is performed on each image data of the multiband image data.

The multiband image data g ′ _k (x, y) after the in-plane unevenness correction is transferred to the matrix calculation unit 716. The matrix calculation unit 716 performs spectrum (spectral reflectance) estimation processing using the multiband image data g ′ _k (x, y) from the in-plane unevenness correction unit 715. In this spectrum (spectral reflectance) estimation process, spectral reflectance is estimated at 1 nm intervals in a wavelength band from 380 nm to 780 nm. That is, in this embodiment, a 401-dimensional spectral reflectance is estimated.

In general, a heavy and expensive spectroscopic measuring instrument is used to obtain the spectral reflectance for each wavelength. However, in this embodiment, since the subject is limited to teeth, the subject has a certain amount. By utilizing the feature, the 401-dimensional spectral reflectance is estimated with a small number of bands.
Specifically, a 401-dimensional spectrum signal is calculated by performing a matrix operation using the multiband image data g ′ _k (x, y) and the spectrum estimation matrix Mspe.

  The spectrum estimation matrix Mspe is created by the spectrum estimation matrix creation unit 717 based on the spectral sensitivity data of the camera, the LED spectrum data, and the statistical data of the subject (tooth). The creation of the spectrum estimation matrix is not particularly limited, and a well-known method can be used. For example, one example is described in detail in S. K. Park and F. O. Huck “Estimation of spectral reflectance curves from multispectrum image data”, Applied Optics, 16, pp 3107-3114 (1977).

  Note that the spectral sensitivity data of the camera, the LED spectrum data, the subject (tooth) statistical data, and the like are stored in advance in the image filing unit 113 shown in FIG. When the spectral sensitivity of the camera changes depending on the position of the sensor, spectral sensitivity data may be acquired according to the position, or the center position may be appropriately corrected and used. .

  When the spectral reflectance is calculated by the spectrum estimation calculation unit 71, the calculation result is transferred to the observation spectrum calculation unit 72 shown in FIG. 4 together with the multiband image data.

  The observation spectrum calculation unit 72 calculates the spectrum of the subject under the illumination light to be observed by multiplying the tooth spectrum obtained by the spectrum estimation calculation unit 71 by the illumination light S (λ) to be observed. S (λ) is a light source for observing the color of the tooth, such as a D65 or D55 light source or a fluorescent light source, and this data is stored in the image filing unit 113 in advance. The spectrum of the subject under the illumination light to be observed, obtained by the observation spectrum calculator 72, is transferred to the chromaticity value calculator 73.

The chromaticity value calculation unit 73 calculates a chromaticity value L ^* a ^* b ^* from the spectrum of the subject under illumination light to be observed, and further, the chromaticity value L ^* a ^* b ^{* for} each tooth part ^. And the result is output to the color sample selection unit 80 and the image display control unit 115 in association with the region.

  On the other hand, the spectrum G (x, y, λ) of the subject under illumination light to be observed is sent to the color image creation processing unit 112. The color image creation processing unit 112 creates RGB2 (x, y), which is RGB image data to be displayed on the monitor, and outputs it to the image display control unit 115.

When the RGB color image data and the average chromaticity value L ^* a ^* b ^* of each part of the patient's tooth are input, the image display control unit 115 displays these information on the monitor 4. FIG. 12 is a diagram showing an example of the display screen, and an RGB color image of the patient's teeth is displayed at the upper left of the approximate center of the screen.

  The user sets a comparison area for comparison with the tooth color sample on the RGB color image of the patient's tooth displayed on the monitor 4 by operating the input device 5. As a result, the comparison area A is set on the RGB color image of the patient's teeth displayed on the monitor 4 as shown in FIG. 13, and the position information of the comparison area A is input from the input device 5 to the color sample selection unit. 80.

In FIG. 7, the part setting unit 81 of the color sample selection unit 80 determines the part to which the comparison area A belongs based on the information of the comparison area A given from the input device 5 and sets the part as the target part. For example, the color sample selection unit 80 determines a part to which the comparison area A belongs by recognizing which part of the tooth the comparison area A corresponds to by contour extraction. In this embodiment, a gum part is set as a target part.
Information on the target part set by the part setting unit 81 is transferred to the comparison information extraction unit 82 and the tooth information extraction unit 83. The comparison information extraction unit 82 extracts the gum group information group from the color sample information storage unit 114, and outputs the extracted information group to the color comparison unit 84. In addition, the tooth information extraction unit 83 extracts an average chromaticity value corresponding to the gum from the average chromaticity value of each part of the patient's tooth transferred from the chromaticity value calculation unit 73, and the color comparison unit 84. Output to.

Color comparison unit 84, the comparison information extracting each average chromaticity value information group input from the unit 82 ^L * ^a * ^{b *} average chromaticity inputted from the tooth information extraction unit 83 value ^L * ^a * ^{b *} Color difference ΔE is calculated, and the calculated color difference ΔE is associated with the information group and output to the information selection unit 85. The color difference ΔE is given by the following equation (2).

In the above ^{(2), L *, a} *, b * average chromaticity values of the gums of the patient's ^{teeth, L'*, a'*, b'} * is the average chroma value of the information groups.

  The information selection unit 85 selects the information group having the smallest color difference ΔE as the optimum information group, outputs the selected information group to the image display unit 115, and outputs the RGB color sample information to which the information group belongs. Color image data is acquired from the color sample information storage unit 114, and RGB color image data of the acquired tooth pattern color sample is output to the image display control unit 115.

The image display control unit 115 includes the RGB color image data of the tooth type color sample input from the color sample selection unit 80 and the average chromaticity value L ^* a ^* b ^* , color difference ΔE, treatment support information, and the like constituting the information group. Various information is displayed on the monitor 4. FIG. 14 shows an example of the monitor screen. As shown in FIG. 14, the RGB color image data of the tooth pattern color sample of the information group selected by the information selection unit 85 is displayed along with the RGB color image of the patient's tooth, and the target part, that is, the gum part Treatment support information is displayed. In FIG. 14, the treatment support information is shown as a list. For example, the layer structure in the tooth-type color sample may be shown more clearly as shown in FIG. 15, or as shown in FIG. It is good also as displaying the cross-sectional view of and showing the structure of each layer etc. clearly. Note that the display example is just an example, and any information may be used as long as it notifies the user of the treatment support information. Further, as shown in FIG. 17, the RGB color image of the patient's tooth and the RGB color image of the tooth type color sample may be displayed adjacent to each other. Displaying in this way facilitates detailed comparison of color tones.

  As described above, according to the dental color measurement device according to the present embodiment, an image of a tooth-type color sample is obtained by photographing a tooth-type color sample having a tooth shape and a layer structure corresponding to the part. The chromaticity average value of each part is calculated based on this image, and the chromaticity average value and the treatment support information of the tooth type color sample are associated with each part in the color sample information storage unit 114. Remember. Then, the information group of the part (target part) to which the comparison region set on the tooth image of the tooth pattern color sample patient belongs is extracted from the color sample information storage unit 114, and the patient's tooth in the extracted information group An information group that approximates the colorimetric information in the target region is selected. In this way, since the information group such as the chromaticity average value is created based on the image of the tooth-type color sample having a three-dimensional tooth shape and a layer structure corresponding to the part, the three-dimensional shape of the tooth It is possible to select treatment support information in consideration of light wraparound or color reflection in the translucent layer. Thus, treatment such as filling of the prosthetic material based on the selected treatment support information is performed, so that the color of the cavity after treatment can be a natural color that is familiar with the surrounding colors.

In the present embodiment, the information group close to the color of the patient's tooth is selected based on the average chromaticity value. However, the above example is an example, and the selection is based on other colorimetric information. Also good. For example, instead of the average chromaticity value, the information group may be selected based on a spectrum (in this embodiment, spectral reflectance) obtained by the chromaticity calculation unit 70.
In this case, the color sample information storage unit 114 stores the spectral reflectance acquired by the spectrum estimation calculation unit 71 (see FIG. 4) instead of the average chromaticity value.
The selection of the information group is performed based on, for example, a spectrum determination value Jvalue obtained based on the following equation (3).

In the above equation (3), Jvalue is a spectrum judgment value, C is a normalization coefficient, n is a statistical number (the number of λ used for calculation), λ is a wavelength, and f ₁ (λ) is a spectral sensitivity of a patient's tooth. The spectrum value, f ₂ (λ) is the spectral sensitivity spectrum value in the information group of the tooth color sample, and E (λ) is the determination sensitivity correction value. In the present embodiment, weighting relating to spectral sensitivity according to λ is performed by E (λ).

In this way, the spectral reflectance of each tooth-type color sample is substituted into f ₂ (λ) in the above equation (3), and the respective spectrum determination values Jvalue are calculated. And it is good also as selecting the information group of a tooth-type color sample when the smallest spectrum judgment value Jvalue is shown. Further, the number of tooth type color samples to be selected is not limited to one, and it is also possible to select all information groups in which a preset number or difference is within a certain range.

Further, in the present embodiment, as shown in FIG. 5, the tooth is divided into three regions of a gum part, a central part, and a cutting edge part. However, the present invention is not limited to this, and for example, as shown in FIG. 18. In class III,
It is good also as carrying out another division like IV class and V class.

  Further, in the present embodiment, a single tooth-type color sample is photographed by the imaging device 1, but instead, as shown in FIG. 19, the tooth-type color sample and the pseudo-adjacent sample are formed on the rubber pseudo-gingiva. It is good also as attaching a tooth | gear and imaging | photography in this state. By photographing the tooth-type color sample under the same conditions as in the actual oral cavity, it is possible to acquire color sample image data that takes into account the red reflection by the gingiva, the shadow of the adjacent teeth, and the like. By acquiring colorimetric information such as average chromaticity values using such color sample image data, it becomes possible to select a group of information closer to the color of the patient's teeth and to obtain more appropriate treatment support information It becomes possible.

In this embodiment, the average chromaticity value of each part is used as the colorimetric information. However, the chromaticity value at the center position of the part may be adopted as the colorimetric information instead of the average. The color space for obtaining colorimetric information is not limited to the L ^* a ^* b ^* color space. For example, luminance, saturation, and hue in the VCH space may be used, and X, Y, and Z values in the XYZ space may be used. It is good also as using.

Further, the tooth type color sample may be further classified into anterior teeth, molar teeth, canines, etc., or may be classified according to the age of children, adults, elderly people, and the like. This is also because the layer structure, particularly the layer thickness, differs depending on these.
In the present embodiment, the comparison region is designated on the RGB color image of the patient's teeth displayed on the monitor 4 and the target region is set based on the comparison region. Is not limited to this example. For example, the target part itself may be directly designated from the input device 5.

Moreover, it is good also as setting an object site | part automatically. For example, the cavity may be specified in the image data of the tooth of the patient in which the cavity is formed, and the part to which the cavity belongs may be set as the target part. Since the color of the cavity is different from the surrounding colors, it is possible to easily identify the cavity by performing image processing such as edge detection.
In the present embodiment, the chromaticity value of each part of the tooth mold color sample is acquired by photographing the tooth mold color sample with the photographing apparatus 1. Is not limited to this example. For example, the spectroscope may measure the chromaticity value of the tooth color sample for each part, and the average chromaticity value in each part may be transferred to the color sample selection unit 80.

  Further, in the present embodiment, a tooth-type color sample having an actual tooth shape was used, but in addition to this, a cavity is formed in each part, and the prosthetic material is formed with a layer structure corresponding to the part with respect to the cavity. It is good also as acquiring colorimetric information from the tooth-type color sample after filling and prosthetic material filling. Here, the color measurement information may be acquired from color sample image data obtained by photographing the tooth mold color sample after filling the prosthetic material, or the color measurement information of the tooth mold color sample is known. In some cases, the user may input directly from the input device 5.

  In this configuration, the user forms a cavity in the tooth color sample and fills the cavity with a prosthetic material. Next, the color inside and outside the cavity is compared by the user or the dental colorimetric device 3 in the vicinity of the boundary of the cavity. When the colors inside and outside the cavity are almost the same, colorimetric information of the tooth-shaped color sample after filling the prosthetic material and treatment support information such as the layer structure of the filled prosthetic material are stored in the color sample information storage unit 114. Remembered. If the color inside and outside the cavity does not match, the user refills the cavity with the prosthetic material and the colors inside and outside the cavity are compared again. These operations are repeated until the color inside and outside the cavity matches.

  Thus, by actually filling the cavity formed in the tooth type color sample with the prosthetic material and obtaining the color measurement information in association with the treatment support information from the tooth type color sample after filling, the patient's It is possible to select treatment support information suitable for a treatment form that forms a cavity in a tooth. In addition, since the cavity formed in the tooth-shaped color sample is filled with prosthetic materials used in actual clinical practice, it simulates the prosthetic filling technique performed in clinical practice and is closer to the patient's teeth after treatment. Can be obtained. Further, a large number of tooth type color samples are created by changing the position, shape, and color distribution of the cavity, and the color sample information storage unit 114 stores colorimetric information and treatment support information of each tooth type color sample. You can also. Thereby, treatment support information suitable for various symptoms and various tooth colors of patients can be selected.

[Second Embodiment]
Hereinafter, a dental colorimetric apparatus according to a second embodiment of the present invention will be described.
In the dental colorimetric apparatus according to the present embodiment, as shown in FIG. 20, each part composed of a gum part, a central part, and a cutting edge part is subdivided into a plurality of small areas, and colorimetric information ( For example, chromaticity values and spectral reflectances are acquired and stored in the color sample information storage unit 114 in association with each part.

In such a dental colorimetric device, when multiband image data of a patient's teeth is input, an average color for each of the small regions in the chromaticity value calculation unit 73 of the chromaticity calculation unit 70 (see FIG. 4). The degree values are calculated, and these values are transferred to the color sample selection unit 80 in association with the small areas.
On the other hand, on the display screen as shown in FIG. 13, when the comparison area A is designated by the user, the target part setting unit 81 (see FIG. 7) of the color sample selection unit 80 selects the part to which the comparison area belongs as the target part. And the set target part information and comparison area information are transferred to the comparison information extraction unit 82 and the tooth information extraction unit 83.

  For example, as shown in FIG. 21, when a part of the gum is designated by the user as the comparison region C, the gum is set as the target region, and the information of the comparison region C is compared with the comparison information extraction unit 82 and It is transferred to the tooth information extraction unit 83.

  The comparison information extraction unit 82 extracts the information group associated with the gum part from the color sample information storage unit 114, and outputs the extracted information group to the color comparison unit 84 together with the information on the comparison area. On the other hand, the tooth information extraction unit 83 extracts the average chromaticity value of the small region belonging to the comparison region from the average chromaticity value of each small region of the patient's tooth input from the chromaticity value calculation unit 73, Is output to the color comparator 84.

The color comparison unit 84 extracts the average chromaticity value of the small region belonging to the comparison region from each information group input from the comparison information extraction unit 82 and inputs the average chromaticity value of each small region from the tooth information extraction unit 83. It compares with the average chromaticity value of each small area | region made. Specifically, the average chromaticity values at the same position are compared, and a color difference is obtained for each small area. The color difference is calculated based on the above equation (2).
Thereby, for example, as shown in FIG. 21, when the comparison area is composed of six small areas, six color differences are obtained. When the color comparison unit 84 calculates the color difference for each small area, the color difference is transferred to the information selection unit 85 together with the information group.

  The information selection unit 85 selects an information group having the smallest color difference input from the color comparison unit 84 as an optimum color sample. In the present embodiment, since a plurality of color differences are input for one information group, an optimal information group is selected using statistical means such as a least square method. The information selection unit 85 acquires RGB color image data of the color sample information to which the selected information group belongs from the color sample information storage unit 114, and outputs the RGB color image data and the selected information group to the image display unit 115. To do.

As described above, according to the dental color measurement device according to the present embodiment, each part is subdivided into a plurality of small areas, and color comparison is performed for each small area, so that color comparison is performed in more detail. Is possible. This makes it possible to present more suitable treatment support information to the doctor.
The size of the small area is not limited. For example, each pixel may be set as a small area.

  Further, the plurality of small regions may include a region of interest to be treated and a region around the region of interest. The surrounding area may be divided into a plurality of areas, or may be a single area surrounding the region of interest. In this way, color comparison can be performed for each of the region of interest and the surrounding region of the target portion. Since an actual tooth has a structure including a translucent layer, light from a region around the region of interest may cause a unique color in the region to be reflected in the region of interest. Therefore, when comparing a patient's tooth with a tooth-type color swatch, the area of interest itself is affected by the color and layer structure of the area itself, even though the color and layer structure of the area of interest itself are different. As a result, the colorimetric information in the region of interest may be approximated in several ways. Therefore, if an information group only for a region of interest is acquired, an appropriate treatment support information may be selected because the information group of the surrounding region is not taken into consideration. In this case, when the patient's teeth are actually filled with a prosthetic material, the colorimetric information of the filled part may be different from the colorimetric information measured in advance in the tooth-type color sample. Therefore, by comparing the colorimetric information not only in the region of interest but also in the surrounding region, it is possible to obtain colorimetric information in which the influence of the inherent color and layer structure in the surrounding region is taken into account. As a result, it is possible to improve the accuracy of selecting appropriate treatment support information that matches the color of the patient's teeth.

  Further, in the present embodiment, the calorimetric information of the small areas belonging to the comparison area is compared with each other, but by comparing the calorimetric information with respect to all the small areas belonging to the target part, at least One information group may be selected.

In the present embodiment, the target region and the comparison region may be automatically set. For example, the cavity may be specified in the image data of the tooth of the patient in which the cavity is formed, and the part to which the cavity belongs may be set as the target part. Since the color of the cavity is different from the surrounding colors, it is possible to easily identify the cavity by performing image processing such as edge detection. In addition, a predetermined number of small regions located around the cavity in the specified target region may be automatically set as comparison regions. Thus, by automatically setting the target region and the comparison region, it is possible to reduce the burden on the user such as a doctor.
Thus, by setting the periphery of the cavity as a comparison region, it becomes possible to make the color of the cavity portion after treatment substantially the same color as the periphery. As a result, the treatment mark can have a natural finish.

[Third Embodiment]
Hereinafter, a dental colorimetric apparatus according to a third embodiment of the present invention will be described.
In the dental colorimetric apparatus according to the present embodiment, in addition to the information group acquired based on the above-described tooth type color sample, information obtained by the following method is also handled as color sample information.
First, a doctor performs treatment by filling the resin into the cavity formed in the patient's teeth (step SA1 in FIG. 22). Subsequently, the patient's teeth after the resin filling treatment are photographed by the imaging device 1, and the acquired multi-band image data of the patient's own teeth is acquired (step SA2). The multiband image data is subjected to various processes in the chromaticity calculation unit 70, and an average chromaticity value or the like is output to the color sample selection unit 80 (step SA3).

  Further, the doctor inputs the current treatment information as treatment support information from the input device 5 (step SA4). For example, layer structure, layer thickness, treatment site, layer material information, etc. are input as treatment support information. The input information is transferred to the color sample selection unit 80. The color sample selection unit 80 associates the average chromaticity value input from the chromaticity calculation unit 70 with the treatment support information obtained from the input device 5 and stores it in the color sample information storage unit 114 as color sample information (step S110). SA5).

  As described above, according to the dental colorimetric device according to the present embodiment, it is possible to use an image of a patient's own tooth after resin filling as color sample information, and thus more appropriate resin filling. It becomes possible to select a recipe. As a result, it is possible to perform treatment with treatment support information that matches the patient's teeth.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

1 is a block diagram illustrating a schematic configuration of an imaging device and a cradle according to a first embodiment of the present invention. It is a figure which shows the spectrum of the light source shown in FIG. It is a figure explaining signal correction. 1 is a block diagram illustrating a schematic configuration of a dental colorimetric device according to a first embodiment of the present invention. It is the figure which showed each site | part set to a tooth. It is the figure which showed an example of color sample information. It is a functional block diagram of the color sample selection part which concerns on the 1st Embodiment of this invention. It is a figure which shows the schematic internal structure of the spectrum estimation calculating part shown in FIG. It is a figure explaining input gamma correction. It is a figure which shows an example of the low-pass filter applied to R signal and B signal in pixel interpolation calculation. It is a figure which shows an example of the low pass filter applied to G signal in pixel interpolation calculation. It is the figure which showed an example of the display screen of a monitor. FIG. 13 is a diagram showing a display screen when a comparison area is designated on the display screen shown in FIG. 12. It is a figure which shows the screen on which the information group selected by the color sample selection part was displayed. It is the figure which showed the other display mode of treatment assistance information. It is the figure which showed the other display mode of treatment assistance information. It is the figure which showed the other display mode of treatment assistance information. It is the figure which showed the other setting aspect of the site | part. It is the figure which showed an example of arrangement | positioning of the tooth type color sample at the time of imaging | photography. It is a figure for demonstrating a small area | region. It is a figure for demonstrating handling of the small area | region when a comparison area | region is set to the gum part. It is the flowchart shown about the process sequence in the case of using the data of a patient's own tooth as color sample information.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Cradle 3 Dental colorimetric device 4 Monitor 5 Input device 70 Chromaticity calculation part 71 Spectrum estimation calculation part 72 Observation spectrum calculation part 73 Chromaticity value calculation part 80 Color sample selection part 81 Site setting part 82 Comparison information extraction Unit 83 tooth information extraction unit 84 color comparison unit 85 information selection unit 110 multiband image memory 112 color image creation processing unit 114 color sample information storage unit 115 image display control unit

Claims (10)

A plurality of information groups including colorimetric information and treatment support information acquired from a tooth-type color sample having a three-dimensional tooth shape and a layer structure corresponding to the part are stored in association with the part. Storage means
Image data acquisition means for acquiring image data of a patient's teeth;
A site setting means for setting a target site for comparing the color of the tooth of the patient and the color of the tooth type color sample;
Comparison information extraction means for extracting the information group associated with the target part from the storage means;
Tooth information extraction means for extracting colorimetric information on the target part set by the part setting means based on the image data of the patient's tooth;
Color comparison means for comparing the colorimetric information of the plurality of information groups extracted by the comparison information extraction means with the colorimetric information of the patient's teeth extracted by the tooth information extraction means;
A dental colorimetric apparatus comprising: information selection means for selecting at least one information group from among a plurality of information groups extracted by the information extraction means based on a comparison result by the color comparison means. Display means for displaying an image of the patient's teeth;
Input means, and
The dental colorimetry according to claim 1, wherein the part setting unit sets, as the target part, a part to which a comparison region designated by a user via the input unit belongs on the image displayed on the display unit. apparatus.   The dental colorimetric device according to claim 1, wherein the part setting unit specifies a position of a cavity in the image data of the patient's tooth and sets the part to which the cavity belongs as the target part. The part is subdivided into a plurality of small areas, and the colorimetric information constituting the information group is stored in the storage means in units of the small areas.
The said comparison means compares the colorimetric information of the said information group in the said object site | part with the colorimetric information of the said patient's tooth for every small area | region in the said object site | part. Dental colorimetric device.   The dental colorimetric device according to claim 4, wherein the plurality of small regions include a region of interest to be treated and a region around the region of interest.   The color sample image data is obtained by photographing a tooth type color sample having a tooth shape and a layer structure corresponding to a part, and the colorimetric information is obtained from the color sample image data. The dental colorimetric device according to claim 5.   A cavity is formed in each part of the tooth-shaped color sample having an actual tooth shape, the prosthetic material is filled into the cavity with a layer structure corresponding to the part, and the measurement is performed from the tooth-shaped color sample after filling the prosthetic material. The dental colorimetric apparatus according to claim 1, wherein color information is acquired in association with the treatment support information.   The dental colorimetric device according to claim 6 or 7, wherein the color sample image data is acquired by performing imaging in a state where the tooth type color sample is attached to a pseudogingival.   The dental colorimetric apparatus according to any one of claims 6 to 8, wherein the color sample image data is acquired by performing imaging in a state where adjacent teeth are arranged on both sides of the tooth type color sample.   After filling the cavity formed in the patient's tooth with a prosthetic material in a layer structure corresponding to the site, the patient's individual color sample image data is obtained by photographing the tooth, and the acquired color sample image data is measured. The dental colorimetry according to any one of claims 1 to 9, wherein color information is acquired, the information group is created by associating the colorimetric information with information related to the treatment, and stored in the storage unit. apparatus.

Images