JP2011182993A - Dental plaque detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dental plaque detector for accurately detecting dental plaque. <P>SOLUTION: The dental plaque detector 1 includes: a camera 21 for photographing the inner part of a mouth; an LED 22 for irradiating the inner part of the mouth; an information processing part 23 for extracting tooth surface parts and plaque parts, based on a difference in color concerning data of an image photographed by the camera 21; and an announcement speaker 24 and an announcement LED 25 for announcing information related to the plaque extracted by the information processing part 23. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plaque detection device that detects plaque in the oral cavity.

  As a plaque detection device, a device that detects plaque using a fluorescent material produced by some bacteria that form plaque is known. For example, as disclosed in Patent Document 1, the plaque detection device detects a light source configured by an LED (Light Emitting Diode) that emits light having an excitation wavelength that causes a fluorescent substance to emit light, and light emitted from the fluorescent substance. And a detector configured by a photo diode sensor.

Japanese translation of PCT publication No. 2002-515276

  By the way, since the fluorescence emission intensity, which is the intensity of light emitted by the fluorescent substance in plaque, is weak, in order to increase the detection accuracy of plaque in a plaque detection device that detects plaque based on the fluorescence emission intensity It is necessary to increase the sensitivity of the photodiode sensor that detects light.

  However, when the sensitivity of the photodiode sensor is increased, the detection unit operates in response to light that does not originate from fluorescent substances in plaque such as external light that is light from the oral cavity and reflected light from the oral cavity. The possibility of false detection increases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a plaque detection device capable of accurately detecting plaque.

  In order to solve the above-mentioned problems, a dental plaque detection apparatus according to the present invention is based on a difference between colors in a camera that shoots the oral cavity, a light source that irradiates the oral cavity, and image data captured by the camera. It includes an information processing unit that extracts a part and a plaque part, and an informing unit for informing information about plaque extracted by the information processing unit.

The dental plaque detection apparatus preferably handles a color space with independent brightness parameters as the color space of the image data.
Moreover, it is preferable that the dental plaque detection apparatus handles any one of the YUV color space, the HSV color space, and the HLS color space as the color space of the image data.

  Moreover, it is preferable that the said plaque detection apparatus calculates the area ratio of the said tooth | gear surface site | part and the said plaque site | part in the data of the said image, and determines the adhesion degree of plaque based on the calculated area ratio.

  Further, the plaque detection device calculates a moving average value of each area of the tooth surface part and the plaque part based on data of a plurality of images obtained by continuous imaging, and the moving average value It is preferable to calculate the area of the plaque part relative to the area of the tooth surface part using.

  Further, the plaque detection device excludes a maximum value and a minimum value from the areas of the plurality of tooth surface parts calculated based on the data of the plurality of images, and the moving average value of the tooth surface parts. And calculating a moving average value of the plaque site by excluding the maximum and minimum values of the areas of the plurality of plaque sites calculated based on each of the data of the plurality of images. Is preferred.

Moreover, it is preferable that the said plaque detection apparatus extracts the highlight site | part of the data of the said image, and uses the information of the extracted highlight site | part for extraction of the said tooth surface site | part.
Moreover, it is preferable that the dental plaque detection apparatus excludes the image data in which the area of the tooth surface part is smaller than a predetermined value from the extraction target of the tooth surface part and the plaque part.

Moreover, it is preferable that the said plaque detection apparatus extracts the said tooth surface site | part and the said plaque site | part within the range of the depth of field in the said image.
The dental plaque detection apparatus preferably includes a video output unit for displaying an image taken by the camera.

  Moreover, it is preferable that the said plaque detection apparatus contains the cleaning part for cleaning a tooth | gear.

  According to the present invention, dental plaque can be detected with high accuracy.

1A is a configuration diagram showing the overall configuration of a plaque detection system including a plaque detection device according to an embodiment of the present invention, and FIG. 2B is a perspective view of a plaque detection device according to a modification of the embodiment. . Sectional drawing which shows typically the cross-section of the plaque detection apparatus of the embodiment. The flowchart which shows the procedure of the plaque detection using the plaque detection system of the embodiment. The schematic diagram which shows an example of the image in the oral cavity image | photographed by the plaque detection apparatus of the embodiment. The flowchart which shows the procedure of the site | part extraction process performed by the dental plaque detection apparatus of the embodiment. The flowchart which shows the procedure of the plaque degree calculation process performed by the plaque detection apparatus of the embodiment.

An embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the plaque detection device 1 is connected to an image display device 9 that is an external device, and the plaque detection device 1 and the image display device 9 constitute a plaque detection system. Note that the user of the plaque detection device 1 may be an oral subject whose plaque is detected, or may be another third party.

  The plaque detection device 1 includes a main body portion 11 that becomes a handle when a user uses the present device, and a head portion 12 provided on the main body portion 11. The head portion 12 is an oral cavity insertion portion that is inserted into the oral cavity, is provided extending from the main body portion 11, and is smaller than the main body portion 11.

  As shown in FIG. 2, the plaque detection device 1 includes a camera 21, an LED 22, an information processing unit 23, a notification speaker 24, a notification LED 25, as components built in the main body unit 11 or the head unit 12. A battery 26 and a video signal output terminal 27 are provided.

  The camera 21 built in the head unit 12 is a device including an image sensor. Specifically, a substrate 12a on which a wiring circuit is formed is provided in the head portion 12, and the camera 21 is constituted by a small camera module provided on the substrate 12a. The camera 21 takes an image of the oral cavity with an imaging device through a window 12b made of a transparent resin. The intraoral image data thus captured by the camera 21 is input to the information processing unit 23 as a video signal.

  An LED 22 built in the head unit 12 and provided around the camera 21 is a light source that irradiates the oral cavity through the window 12b. Similar to the camera 21, the LED 22 is configured by a light emitting diode provided on the substrate 12 a. The light emitted from the LED 22 to the oral cavity is light in a wavelength band near 405 nm including a wavelength of 405 nm.

  The information processing unit 23 incorporated in the main body 11 performs various signal processing and information processing based on the video signal input from the camera 21, and is attached to the tooth surface which is the tooth surface. It is an electronic circuit that detects The information processing unit 23 configured by an electronic circuit drives the notification speaker 24 and the notification LED 25 built in the main body unit 11 when the degree of plaque adhesion on the teeth is equal to or greater than a predetermined level.

  The notification speaker 24 configured by a small speaker is a notification unit that notifies the user that the degree of adhesion of plaque is greater than or equal to a predetermined level, and is a sound generation unit that notifies the user by making a sound. In addition, the notification LED 25 configured by a light emitting diode is a notification unit that notifies the user that the degree of adhesion of dental plaque is greater than or equal to a predetermined value, and is a light emitting unit that notifies by emitting light.

  The battery 26 built in the main body 11 is an internal power source for operating the plaque detection device 1 without supplying power from outside the plaque detection device 1. Further, the video signal output terminal 27 is a terminal for outputting a video photographed by the camera 21 to the video display device 9 as an electrical signal. The video signal output terminal 27 is provided on a connector 27 </ b> A built in the main body 11.

  In the dental plaque detection apparatus 1 configured as described above, the information processing unit 23 functions as a detection unit that detects plaque by analyzing an image captured by the camera 21. Hereinafter, the operation of the plaque detection apparatus 1 that detects plaque and drives the notification unit will be described in detail with reference to FIG. Note that the series of operations shown in FIG. 3 starts when the power switch 23 a provided in the electronic circuit constituting the information processing unit 23 is operated.

  As shown in FIG. 3, the plaque detection apparatus 1 for detecting plaque performs a series of operations of initialization of detection processing, image capture, image conversion, part extraction processing, plaque degree calculation processing, and notification. The series of operations shown in FIG. 3 is repeated until the power switch 23a is operated again and an instruction to stop detecting plaque is input to the plaque detecting apparatus 1.

  First, in the plaque detection apparatus 1, the internal memory (not shown) provided in the camera 21 and the information processing unit 23 is initialized (step S1), and the camera 21 starts imaging in the oral cavity. Since the camera 21 captures moving images, the intraoral area is imaged while the head unit 12 is moved within the oral cavity, whereby continuously captured images are obtained. The intraoral image captured by the camera 21 is input to the information processing unit 23 as an image signal that is an electrical signal. In addition, the video image | photographed with the camera 21 is output by the video display apparatus 9 at any time by outputting as an electrical signal from the video signal output terminal 27 which is a video output part for displaying an image.

  Next, the information processing unit 23 captures a still image for one image from the video captured by the camera 21 based on the video signal input from the camera 21 (step S2). The captured still image in the oral cavity is stored as image data in the internal memory of the information processing unit 23. In this way, the information processing unit 23 acquires data of an image photographed by the camera 21. Note that the number of times a still image is captured is counted using a counter (not shown).

In step S3, the information processing unit 23 determines whether or not a still image has been captured a predetermined number of times after the initialization.
If it is determined in step S3 that a still image has not been captured a predetermined number of times, step S2 is repeated. That is, a still image is captured a predetermined number of times, and data of a plurality of images in the oral cavity are stored in the internal memory of the information processing unit 23.

  If it is determined in step S3 that a still image has been captured a predetermined number of times, the processes in and after step S4 are executed. For example, the information processing unit 23 can capture a still image for one image at an interval of 25 milliseconds, and when it is determined that the still image has been captured 20 times, the operation after step S4 is executed. Is done.

  When data of a plurality of images is obtained, the information processing unit 23 serving as an image conversion unit performs image conversion (image processing) on each image (step S4). Specifically, the information processing unit 23 converts captured still image data (that is, capture data) from, for example, RGB format data to HSV format data. The data in the HSV format is a data format conforming to the HSV color space, which is a color space composed of three components of hue (H), saturation (S), and lightness (V). The information processing unit 23 handles each degree of hue, saturation, and brightness with numerical values in the range of 0 to 255. The HSV color space is a color space whose brightness is independent as a brightness parameter and is a color space which is a component other than brightness, compared to each component constituting the RGB color space, which is a color space where the brightness parameter is not independent. Degree and lightness are components that are less related to brightness.

  Following step S4, the information processing unit 23, which is a part information processing unit, extracts each part in the oral cavity in the still image by performing part extraction processing from the still image as shown in FIG. 4 (step S5). The part extraction process in step S5 will be described in detail with reference to FIG.

  In the part extraction process shown in FIG. 5, first, a plaque part B which is a part of plaque in a still image is extracted (step S11). Specifically, the information processing unit 23 analyzes each pixel constituting the still image and, for example, the hue value is in the range of 15 to 20, and both the saturation and lightness values are the same. More than 128 parts are extracted as plaque site B.

  Next, the information processing section 23 extracts a tooth surface part A1 that is a part of the tooth surface in the still image (step S12). Specifically, the information processing unit 23 analyzes each pixel constituting the still image and, for example, the hue value is in the range of 10 to 60, and both the saturation and the brightness values are the same. More than 80 parts are extracted as tooth surface part A1. In step S12, the information processing section 23 excludes the dental plaque part B extracted in step S11 from the still image and extracts the tooth surface part A1.

  Further, the information processing section 23 extracts a highlight part A2 that is a part that is difficult to identify as a tooth surface in the still image (step S13). Specifically, the information processing unit 23 analyzes each pixel in the still image and, for example, regardless of the hue value, the saturation value is less than 80 and the brightness value is 200 or more. The part is extracted as the highlight part A2. In step S13, the information processing section 23 excludes the plaque part B extracted in step S11 and the tooth surface part A1 extracted in step S12 from the still image, and extracts the highlight part A2.

  Then, the extracted tooth surface part A1 and highlight part A2 are extracted as the tooth surface part X in the still image. That is, the highlight part A2 is also extracted as a part of the tooth surface part X. In this way, the information processing unit 23 extracts the plaque site B from the image based on the color difference in the capture data in step S11, and in steps S12 and S13, based on the color difference in the capture data The surface part X is extracted from the image.

  In the information processing unit 23, a plurality of images are analyzed in order to calculate the degree of plaque adhesion, and the tooth surface part X and the plaque part B are extracted from each of the plurality of still images. The operation ends.

  Note that the information processing unit 23 extracts the tooth surface part X and the plaque part B from the still image within the range of the depth of field in the still image. That is, since the plaque site B is difficult to be extracted in a so-called out-of-focus area, the out-of-focus area in the still image is excluded from the analysis target.

  As shown in FIG. 1, when the process of step S5 (that is, steps S11 to S13) is completed, the information processing unit 23, which is a plaque degree calculation unit, calculates the extracted tooth surface part X and the plaque part B. The area ratio R is calculated, and the degree of plaque adhesion on the teeth is calculated (step S6). The plaque degree calculation process in step S6 will be described in detail with reference to FIG.

  In the plaque degree calculation process shown in FIG. 6, first, the information processing section 23 calculates the area of the tooth surface part X (step S21), and then calculates the area of the plaque part B (step S22). The area of the tooth surface part X is calculated by counting the number of pixels constituting the tooth surface part X in the image from which the part X is extracted. Similarly, the area of the plaque site B is calculated by counting the number of pixels constituting the plaque site B in the image from which the site B is extracted.

  As described above, the moving average of the plurality of tooth surface portions X extracted from each of the plurality of still images is calculated as the area of the tooth surface portion X in step S21. Similarly, the moving average of the plurality of plaque sites B extracted from each of the plurality of still images is calculated as the area of the plaque site B in step S22.

  If the area of the tooth surface part X extracted from one still image is equal to or less than a predetermined value, the tooth surface is not used without using the areas of the tooth surface part X and the plaque part B extracted from the still image. The average area of site X and plaque site B is calculated. That is, as a result, image data in which the area of the tooth surface part X is smaller than a predetermined value is excluded from extraction targets of the tooth surface part X and the plaque part B for detecting plaque.

  Further, in the calculation of the average area in steps S21 and S22, data having the maximum area of the tooth surface part X and data having the maximum area of the dental plaque part B are excluded from the data of a plurality of images. Further, data having the smallest area of the tooth surface part X and data having the smallest area of the plaque part B are excluded from the data of the plurality of images. That is, the moving average value is calculated by excluding the maximum and minimum values of the areas of the plurality of tooth surface portions X calculated based on the data of the plurality of images. Further, the moving average value is calculated by excluding the maximum and minimum values of the areas of the plurality of plaque sites B calculated based on the data of the plurality of images. In this way, for the calculation of the area ratio R, data having an average area of the tooth surface part X and data having an average area of the dental plaque part B are used.

  Then, the information processing unit 23 calculates the area ratio R of the tooth surface part X and the plaque part B by calculating the value of the ratio of the area of the plaque part B to the area of the tooth surface part X (step) S23). Specifically, in step S23, the value obtained by dividing the number of pixels of the tooth surface part X, which is the sum of the number of pixels of the tooth surface part A1 and the number of pixels of the highlight part A2, by the number of pixels of the plaque part B. Is calculated as an area ratio R.

  As shown in FIG. 1, when the process of step S6 (that is, steps S21 to S23) is completed, the information processing unit 23 determines whether or not plaque has been detected based on the degree of plaque calculated in step S6. Judgment is made (step S7). Specifically, it is determined whether or not the area ratio R calculated in step S23 is larger than a determination value (for example, 0.005).

  In step S7, when the area ratio R is larger than the determination value, it is determined that plaque is adhered to the tooth surface. In this case, the information processing unit 23 drives the notification speaker 24 and the notification LED 25 to notify the user that dental plaque is attached. On the other hand, when the area ratio R is smaller than the determination value, step S2 and subsequent steps are repeated.

According to this embodiment, the following effects can be obtained.
(1) The plaque detection apparatus 1 extracts the tooth surface part X and the plaque part B based on the color difference in the data of the still image data captured by the camera 21, the LED 22, and the camera 21. including. For this reason, it is possible to detect plaque without being based on the intensity of light emitted by the fluorescent substance in plaque (ie, fluorescence emission intensity), compared to the case of detecting plaque based on fluorescence emission intensity, Even when the optical environment is not stable, plaque can be detected with high accuracy. In addition, since the plaque detection device 1 includes a notification speaker 24 and a notification LED 25 for notifying information about plaque extracted by the information processing unit 23 (that is, detection result of plaque), the plaque detection device 1 Can immediately know the detection result of plaque.

  (2) The plaque detection apparatus 1 handles the HSV color space, which is a color space with independent brightness parameters, as the color space of image data. The HSV color space is a color space whose brightness is independent as a brightness parameter. Therefore, even when the oral cavity is dark or the tooth surface or gingiva is excessively illuminated, the specific color can be extracted with high accuracy, and the extraction accuracy of the tooth surface part X and the plaque part B is improved. be able to. Further, since the color of gingiva, which is a similar color in the HSV color space, and the emission color of the fluorescent substance in the plaque are easily distinguished, the extraction accuracy of the plaque site B can be improved. As a result, plaque detection accuracy can be increased.

  (3) The plaque detection apparatus 1 calculates the area ratio R between the tooth surface part X and the plaque part B in the image data, and determines the degree of plaque adhesion based on the calculated area ratio R. For this reason, compared with the detection result of the plaque based only on the area of the plaque part B, the false detection due to the noise in the still image can be reduced and the plaque can be detected with high accuracy. That is, when the degree of plaque adhesion is determined based only on the area of the plaque site B, if noise occurs in the plaque site B in the still image, the plaque adheres due to this noise. The degree may not be determined properly. Therefore, according to the present invention, it is possible to detect dental plaque with high accuracy by reducing false detection caused by noise in an image as compared with the case where dental plaque is detected based only on the area of the plaque site B. it can.

  (4) The plaque detection apparatus 1 calculates a moving average value of the areas of the tooth surface part X and the plaque part B based on data of a plurality of images obtained by continuous imaging, and this moving average The area of the plaque site B relative to the area of the tooth surface site X is calculated using the value. For this reason, compared with the case where the degree of plaque adhesion is determined based on the area ratio R between the tooth surface part X and the plaque part B extracted from one still image, false detection due to noise in the image It is possible to detect dental plaque with high accuracy.

  (5) The plaque detection apparatus 1 excludes the maximum value and the minimum value of the areas of the plurality of tooth surface portions X calculated based on the data of the plurality of images, and the moving average value of the tooth surface portions X Is calculated. Further, the moving average value of the plaque site B is calculated by excluding the maximum and minimum values of the areas of the plurality of plaque sites B calculated based on the data of the plurality of images. That is, among the plurality of still images, a still image in which the area of the extracted tooth surface part X is not average, or a still image in which the area of the extracted dental tooth part B is not average is the tooth surface part X and the plaque. It is not used to determine the degree of plaque adhesion based on the area ratio R with the part B. Therefore, even when a plurality of image data includes image data that is inappropriate for photographing, this data is excluded and plaque can be accurately detected.

  (6) The plaque detection apparatus 1 extracts the highlight part A2 of the image data, and uses the extracted information on the highlight part A2 to extract the tooth surface part X. Although it is difficult to distinguish the color of the highlight part A2 in the still image, such a highlight part A2 reflects light from saliva on the tooth surface and light in a prosthesis such as a silver tooth covering the tooth surface. There is a high possibility that it is caused by the reflection of light. Accordingly, the highlight part A2 in the image is extracted as a part of the tooth surface part X, so that the degree of plaque adhesion is not determined to be high when the degree of plaque adhesion is low for the whole tooth. A simple area ratio R can be calculated.

  (7) The plaque detection apparatus 1 excludes image data in which the area of the tooth surface part X is smaller than a predetermined value from the extraction target of the tooth surface part X and the plaque part B. When the area of the tooth surface part X is small, it may be determined that the degree of adhesion of the plaque is high even if the degree of adhesion of the plaque is low due to noise in the still image. For this reason, detection of dental plaque based on a predetermined area or less of the tooth surface portion X is prohibited, so that false detection due to noise in the image can be further reduced and dental plaque can be detected with high accuracy.

  (8) The plaque detection apparatus 1 extracts the tooth surface part X and the plaque part B within the range of the depth of field in the still image. That is, the tooth surface part X and the plaque part B are not extracted outside the range of the depth of field in the still image (so-called out-of-focus area). Therefore, the extraction accuracy of the tooth surface part X and the plaque part B can be further enhanced.

  (9) The plaque detection apparatus 1 includes a video signal output terminal 27 for displaying a video that is an image taken by the camera 21. For this reason, the user of the dental plaque detection apparatus 1 can easily grasp the intraoral site imaged by the camera 21 by referring to the image displayed using the video signal output terminal 27. . Then, care such as cleaning of the detected plaque can be easily performed.

(Other embodiments)
-As shown in FIG.1 (b), the plaque detection apparatus 1 may further be provided with the brushing part 28 for brushing the tooth | gear surface. The brushing unit 28 shown in FIG. 1B is composed of bundled fibers provided in the head unit 12. The brushing unit 28 is a cleaning unit that cleans the teeth by brushing the surface of the teeth, and the plaque detection device 1 is configured as a brush. According to such a configuration, the user of the plaque detection device 1 can immediately wipe out the detected plaque using the plaque detection device 1.

  The plaque detection apparatus 1 may include a small monitor (not shown) as the video output unit. According to such a configuration, the user of the plaque detection device 1 refers to the image displayed using the small monitor without using the video display device 9, and thereby the effect described in (9) above. Can be obtained.

  The calculation method of the area ratio R may be changed as appropriate, and plaque may be detected based on the tooth surface part X and the plaque part B extracted from one still image. Even in such a case, the degree of plaque adhesion can be determined based on the area ratio R between the tooth surface part X and the plaque part B, and the detection result of the plaque can be notified.

  The converted data converted from the RGB format data is not limited to the HSV format data, and may be YUV format data or HLS format data. The YUV format data is a data format conforming to the YUV color space, which is a color space composed of three components: luminance (Y), color difference from red (U), and color difference from blue (V). The HLS format data is a data format conforming to the HLS color space, which is a color space composed of three components of hue (H), saturation (S), and luminance (L).

  That is, the color space handled as the color space of the image data may be a YUV color space or an HLS color space. Even in such a configuration, the colors in the still image data are separated into components constituting these color spaces, and the tooth surface portion X and the plaque portion B are based on the components constituting the color space. By extracting, the effect according to said (2) and (3) can be acquired.

  Note that the YUV color space is a color space in which the luminance is independent as a brightness parameter, and the color difference, which is a component other than the luminance, is a component that is less related to the brightness than the components constituting the RGB color space. It is. In addition, the HLS color space is a color space whose brightness is independent as a brightness parameter, and the hue and saturation, which are components other than the brightness, are related to brightness compared to the components constituting the RGB color space. Is a small component.

  In the above embodiment, the part extraction process may be performed without performing the image conversion. That is, the tooth surface part X and the plaque part B may be extracted from the still image based on the components constituting the RGB color space.

  -It is good also as a structure which alert | reports the detection result of plaque by the video display apparatus 9. FIG. That is, the notifying unit for notifying the detection result of plaque may be configured by a video output unit such as the video signal output terminal 27 or a small monitor (not shown) provided in the plaque detecting device 1.

  The plaque detection device 1 may be configured to include only the notification speaker 24 or only the notification LED 25 as the notification unit. That is, the plaque detection device 1 only needs to include at least one notification unit.

  DESCRIPTION OF SYMBOLS 1 ... Dental plaque detection apparatus, 9 ... Video display apparatus, 11 ... Main-body part, 12 ... Head part, 12a ... Board | substrate, 12b ... Window, 21 ... Camera, 22 ... LED (light source), 23 ... Information processing part, 23a ... Power switch, 24 ... informing speaker (notifying unit), 25 ... informing LED (informing unit), 26 ... battery, 27 ... video signal output terminal (video output unit), 28 ... brushing unit (cleaning unit).

Claims (11)

A camera for photographing the intraoral area, a light source for irradiating the intraoral area, an information processing unit for extracting a tooth surface part and a plaque part based on a color difference in image data photographed by the camera, And a notifying part for notifying information on the plaque extracted by the part. The plaque detection device according to claim 1,
A dental plaque detecting apparatus, wherein a color space having independent brightness parameters is handled as a color space of the image data. In the plaque detection apparatus according to claim 1 or 2,
A dental plaque detection apparatus, wherein any one of a YUV color space, an HSV color space, and an HLS color space is handled as a color space of the image data. In the plaque detection apparatus according to any one of claims 1 to 3,
A plaque detecting apparatus, wherein an area ratio between the tooth surface part and the plaque part in the image data is calculated, and a degree of adhesion of the plaque is determined based on the calculated area ratio. In the plaque detection device according to claim 4,
A moving average value of each area of the tooth surface part and the plaque part is calculated based on data of a plurality of images obtained by continuous imaging, and the area of the tooth surface part is calculated using the moving average value. The plaque detection apparatus characterized by calculating the area of the said plaque part with respect to. In the plaque detection apparatus according to claim 5,
The moving average value of the tooth surface portion is calculated by excluding the maximum value and the minimum value of the areas of the plurality of tooth surface portions calculated based on the data of the plurality of images, and the plurality of images A plaque detecting apparatus, wherein a moving average value of the plaque part is calculated by excluding a maximum value and a minimum value among areas of the plurality of plaque parts calculated based on each of the data. In the plaque detection apparatus according to any one of claims 1 to 6,
A plaque detection apparatus characterized by extracting a highlight portion of the image data and using the extracted highlight portion information for extraction of the tooth surface portion. In the plaque detection apparatus according to any one of claims 1 to 7,
The plaque detection apparatus, wherein data of the image having an area of the tooth surface portion smaller than a predetermined value is excluded from extraction targets of the tooth surface portion and the plaque portion. In the plaque detection apparatus according to any one of claims 1 to 8,
The dental plaque detecting device, wherein the tooth surface part and the plaque part are extracted within a range of depth of field in the image. In the plaque detection apparatus according to any one of claims 1 to 9,
A dental plaque detection apparatus comprising a video output unit for displaying an image photographed by the camera. In the plaque detection device according to any one of claims 1 to 10,
A dental plaque detection apparatus comprising a cleaning unit for cleaning teeth.

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