WO2022113995A1 - 歯列画像撮影システムおよび歯列画像撮影方法 - Google Patents
歯列画像撮影システムおよび歯列画像撮影方法 Download PDFInfo
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- WO2022113995A1 WO2022113995A1 PCT/JP2021/042961 JP2021042961W WO2022113995A1 WO 2022113995 A1 WO2022113995 A1 WO 2022113995A1 JP 2021042961 W JP2021042961 W JP 2021042961W WO 2022113995 A1 WO2022113995 A1 WO 2022113995A1
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- Prior art keywords
- dentition
- image
- region
- images
- halation
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Definitions
- This disclosure relates to a dentition imaging system and a dentition imaging method.
- Patent Documents 1 and 2 disclose intraoral cameras (Patent Documents 1 and 2) having a function of irradiating the oral cavity with light as a means for observing the oral cavity.
- the subject of this disclosure is to photograph the teeth clearly.
- Multiple lighting devices that illuminate the tooth to be photographed from different directions,
- An imaging device that captures first and second dentition images in which the teeth are captured with different lighting conditions and a predetermined exposure time of the plurality of illumination devices.
- a high-luminance region extraction unit that extracts a high-luminance region in which the brightness exceeds a predetermined luminance threshold value for each of the first and second dentition images, and a high-luminance region extraction unit.
- a high-luminance region comparison unit that calculates the degree of similarity indicating the degree of similarity between the high-luminance regions of the first and second dentition images.
- the halation region specifying portion that specifies the high-luminance region of the first dentition image as the halation region, and the halation region specifying portion.
- An image compositing processing unit that extracts a trimming region in the second dentition image corresponding to the halation region of the first dentition image and executes an image compositing process of replacing the halation region with the trimming region.
- a dentition image capturing system including an dentition image output unit that outputs the first dentition image that has been image-synthesized is provided.
- Multiple lighting devices irradiate the tooth to be imaged with light from different directions.
- the lighting conditions of the plurality of lighting devices differ depending on the photographing device, and the first and second dentition images in which the teeth are captured are photographed at a predetermined exposure time.
- a high-luminance region in which the brightness exceeds a predetermined brightness threshold value is extracted for each of the first and second dentition images.
- the degree of similarity indicating the degree of similarity between the high-intensity regions of the first and second dentition images was calculated.
- the high-luminance region of the first dentition image is specified as a halation region.
- the trimming region in the second dentition image corresponding to the halation region is extracted.
- An image composition process for replacing the halation area with the trimming area is executed.
- the teeth can be clearly photographed.
- FIG. 1 Perspective view of an intraoral camera in the dental imaging system according to the first embodiment of the present disclosure.
- Cross-sectional view schematically showing the imaging optical system incorporated in the intraoral camera Schematic block diagram of the dentition imaging system according to the first embodiment of the present disclosure.
- FIG. An example flowchart showing the flow of halation removal processing
- the figure which shows the trimming process and the composition process Diagram showing a dentition image with halation removed A diagram showing a dentition image including a tooth having an inlay and its brightness distribution.
- Flow chart showing the flow of calibration process A perspective view of a portion of an intraoral camera in a dental imaging system of another embodiment.
- FIG. 1 is a perspective view of an intraoral camera in the dental imaging system according to the first embodiment of the present disclosure.
- FIG. 2 is a cross-sectional view schematically showing a photographing optical system incorporated in an intraoral camera.
- the intraoral camera 10 includes a toothbrush-like housing that can be handled with one hand, and the housing is arranged in the user's oral cavity during dentition imaging.
- the head portion 10a, the handle portion 10b gripped by the user, and the neck portion 10c connecting the head portion 10a and the handle portion 10b are included.
- the photographing optical system 12 of the intraoral camera 10 is incorporated in the head portion 10a and the neck portion 10c.
- the photographing optical system 12 includes an image pickup element 14 and a lens 16 arranged on the optical axis LA.
- the image pickup element 14 is an imaging device such as a C-MOS sensor or a CCD element, and an image of the tooth D is imaged by the lens 16.
- the image pickup device 14 outputs the signal (image data) corresponding to the imaged image to the outside.
- the lens 16 is, for example, a condensing lens, and an image of the incident tooth D is imaged on the image pickup device 14.
- the lens 16 may be a single lens or a lens group composed of a plurality of lenses.
- the photographing optical system 12 further includes a mirror 18 that reflects the image of the tooth D toward the lens 16, an infrared cut filter 20 and a complementary color filter 22 arranged between the mirror 18 and the lens 16.
- a diaphragm 24 arranged between the lens 16 and the image pickup element 14 is included.
- the mirror 18 is arranged on the optical axis LA of the photographing optical system 12 so as to reflect the image of the tooth D that has passed through the incident port 12a of the photographing optical system 12 toward the lens 16.
- the infrared cut filter 20 is a filter that cuts infrared rays contained in the light incident on the image sensor 14.
- the filter of each color pixel (RGB) of the image pickup device 14 such as a CCD element or a C-MOS sensor has total transparency, infrared rays are recognized as white light.
- the infrared cut filter 20 cuts infrared rays from the light before it enters the image sensor 14.
- the complementary color filter 22 is a filter that selectively transmits light having a predetermined wavelength.
- the complementary color filter 22 selectively transmits light having a wavelength of, for example, 430 nm to 460 nm, and cuts light having other wavelengths.
- the aperture 24 is a plate-shaped member having a through hole on the optical axis LA of the photographing optical system 12, and realizes a deep depth of focus. As a result, it is possible to focus on the depth direction in the oral cavity and obtain a dentition image with a clear outline.
- the complementary color filter 22 since the complementary color filter 22 is included in the photographing optical system 12, the fluorescent line is effectively processed by the aperture 24.
- the intraoral camera 10 is equipped with a plurality of first and second LEDs 26A to 26D as a lighting device that irradiates the tooth D to be photographed with light at the time of photographing.
- the first to fourth LEDs 26A to 26D are, for example, white LEDs.
- the first to fourth LEDs 26A to 26D are arranged so as to surround the incident port 12a.
- the translucent cover 28 that covers the first to fourth LEDs 26A to 26D and the incident port 12a is provided so that the gums G and the like do not come into contact with the first to fourth LEDs 26A to 26D and the illumination light is insufficient. It is provided on the head portion 10a.
- the intraoral camera 10 has a composition adjusting mechanism 30 and a focusing adjusting mechanism 32 as shown in FIG.
- the composition adjustment mechanism 30 includes a housing 34 that holds the image pickup device 14 and the lens 16, and an actuator 36 that moves the housing 34 in the extending direction of the optical axis LA.
- the angle of view is adjusted, that is, the size of the dentition imaged on the image sensor 14 is adjusted.
- the composition adjusting mechanism 30 automatically adjusts the position of the housing 34 so that, for example, the entire tooth is captured in the captured image. Further, the composition adjusting mechanism 30 adjusts the position of the housing 34 so as to obtain the angle of view desired by the user based on the operation of the user.
- the focus adjustment mechanism 32 is composed of a lens holder 38 that is held in the housing 34 of the composition adjustment mechanism 30 and holds the lens 16, and an actuator 40 that moves the lens holder 38 in the extending direction of the optical axis LA.
- the actuator 40 adjusts the focus, that is, the focus.
- the focus adjusting mechanism 32 automatically adjusts the position of the lens holder 38 so as to focus on the tooth located in the center of the captured image, for example. Further, the focus adjusting mechanism 32 adjusts the position of the lens holder 38 based on the operation of the user.
- the components of the photographing optical system 12 excluding the mirror 18 may be provided on the handle portion 10bc of the intraoral camera 10.
- FIG. 3 is a schematic configuration diagram of the dentition imaging system according to the first aspect of the present disclosure.
- the dentition image capturing system 100 generally photographs a dentition using an intraoral camera 10 and executes image processing on the captured image. It is configured to do.
- the dental imaging system 100 includes an intraoral camera 10, a mobile terminal 70, and a cloud server 80.
- the mobile terminal 70 is, for example, a mobile phone capable of wireless communication provided with a touch screen 72 capable of displaying, for example, a dentition image as an input device and an output device.
- the mobile terminal 70 functions as a user interface of the dental imaging system 100.
- the cloud server 80 is a server capable of communicating with the mobile terminal 70 via the Internet or the like, and provides an application for using the intraoral camera 10 to the mobile terminal 70. For example, the user downloads the application from the cloud server 80 and installs it on the mobile terminal 70. Further, the cloud server 80 acquires the dentition image taken by the intraoral camera 10 via the mobile terminal 70.
- the dentition imaging system 100 has a central control unit 50 as a main part for controlling the system, an image processing unit 52 for image processing the dentition image from the image pickup element 14, and LED control for controlling a plurality of LEDs 26A to 26D.
- a unit 54, an actuator 36 of the composition adjusting mechanism 30, and a lens driver 56 for controlling the actuator 40 of the focus adjusting mechanism 32 are included.
- the dentition imaging system 100 has a wireless communication module 58 that wirelessly communicates with the mobile terminal 70, and a power supply control unit 60 that supplies power to the central control unit 50 and the like.
- the central control unit 50 of the dentition imaging system 100 is mounted on the handle unit 10b of the intraoral camera 10.
- the central control unit 50 includes a controller 62 such as a CPU or MPU that executes various processes described later, and a memory 64 such as a RAM or ROM that stores a program for causing the controller 62 to execute various processes. Includes.
- the memory 64 stores dentition images (data) taken by the image sensor 14 and various setting data.
- the image processing unit 52 is mounted on the handle unit 10b of the intraoral camera 10, and the dentition image taken by the image pickup element 14 based on the control signal from the controller 62 of the central control unit 50.
- Data is acquired, image processing is executed on the acquired dentition image, and the dentition image after the image processing is output to the central control unit 50.
- the image processing unit 52 is composed of, for example, a circuit, and executes image processing such as noise removal and AWB (Auomatic White Balance) processing on the dentition image, for example.
- the controller 62 transmits the dentition image output from the image processing unit 52 to the mobile terminal 70 via the wireless communication module 58.
- the mobile terminal 70 displays the transmitted dentition image on the touch screen 72, thereby presenting the dentition image to the user.
- the LED control unit 54 is mounted on the handle unit 10b of the intraoral camera 10, and the first to fourth LEDs 26A to 26D are turned on and off based on the control signal from the controller 62.
- the LED control unit 54 is composed of, for example, a circuit.
- the controller 62 transmits a control signal to the LED control unit 54 so as to light the first to fourth LEDs 26A to 26D based on the received signal.
- the lens driver 56 is mounted on the handle portion 10b of the intraoral camera 10 and adjusts the focus with the actuator 36 of the composition adjusting mechanism 30 based on the control signal from the controller 62 from the central control unit 50. It controls the actuator 40 of the mechanism 32.
- the lens driver 56 is composed of, for example, a circuit.
- the controller 62 of the central control unit 50 transmits a control signal to the lens driver 56 so as to perform composition adjustment and focus adjustment based on the received signal.
- the controller 62 calculates the control amount of the actuators 36 and 40 required for composition adjustment and focus adjustment based on the dentition image from the image processing unit 52, and the control signal corresponding to the calculated control amount is the lens. It is transmitted to the driver 56.
- the wireless communication module 58 is mounted on the handle portion 10b of the intraoral camera 10 and wirelessly communicates with the mobile terminal 70 based on the control signal from the controller 62.
- the wireless communication module 58 executes wireless communication with the mobile terminal 70 in accordance with existing communication standards such as WiFi and Bluetooth.
- a dentition image showing the tooth D is transmitted from the intraoral camera 10 to the mobile terminal 70, or an operation signal is transmitted from the mobile terminal 70 to the intraoral camera 10 via the wireless communication module 58.
- the power supply control unit 60 is mounted on the handle unit 10b of the intraoral camera 10, and is mounted on the central control unit 50, the image processing unit 52, the LED control unit 54, the lens driver 56, and the wireless communication module 58. , Distributes the power of the battery 66.
- the power supply control unit 60 is composed of, for example, a circuit.
- the battery 66 is a rechargeable secondary battery, and is wireless by an external charger 69 connected to a commercial power source via a coil 68 mounted on the intraoral camera 10. It will be charged.
- FIG. 4 is an example of a dentition image in which halation occurs on the surface of the tooth.
- the surface of the tooth D is saliva or wet, and the illumination light from the first to fourth LEDs 26A to 26D causes halation H on the surface of the tooth D. sell.
- the surface portion of the tooth D where the halation H is generated is unclear and its state cannot be confirmed. Therefore, the dentition imaging system 100 according to the first embodiment is configured to be able to create a dentition image from which the halation H is removed.
- the dentition image taking system 100 is configured to take a plurality of necessary dentition images.
- FIG. 5 is a timing chart of the shooting operation of a plurality of dentition images necessary for creating a dentition image from which halation is removed. Further, FIG. 6 shows a plurality of dentition images obtained by the photographing operation shown in FIG.
- each of the plurality of dentition images P1 to P4 is photographed under different lighting conditions. Further, a plurality of dentition images P1 to P4 are photographed at a predetermined exposure time TEX .
- the user first holds the intraoral camera 10 with one hand and the mobile terminal 70 with the other hand.
- the user adjusts the position of the head portion 10a of the intraoral camera 10 so that the tooth D to be imaged is reflected on the touch screen 72 of the mobile terminal 70 with the first to fourth LEDs 26A to 26D turned on. do.
- the intraoral camera 10 is fixed in the oral cavity by bringing the head portion 10a of the intraoral camera 10 into contact with the gum G in the vicinity of the tooth D to be imaged.
- the user executes an operation related to the start of shooting on the touch screen 72. Based on the operation, the imaging start signal is transmitted from the mobile terminal 70 to the central control unit 50 of the intraoral camera 10.
- the controller 62 of the central control unit 50 controls the LED control unit 54 to light the first to fourth LEDs 26A to 26D one by one in order.
- the first LED 26A is turned on (ON) and the remaining LEDs are turned off (OFF).
- the central control unit 50 acquires the first dentition image P 1 (stored in the memory 64)
- the second LED 26B is turned on in order to capture the second dentition image P 2 .
- the third LED 26C is turned on, the remaining LEDs are turned off, and the third dentition image P 3 is photographed.
- the controller 62 returns the first to fourth LEDs 26A to 26D to the state before the start of shooting via the LED control unit 54, and notifies the user of the end of shooting via the mobile terminal 70.
- the composition is substantially the same, the illumination direction is different, and a plurality of images (4 images in the case of the present embodiment) taken at a predetermined exposure time TEX are dentition images P.
- the controller 62 of the central control unit 50 executes a process of removing halation H of the dentition image P1. The process will be described with reference to FIG. 7.
- FIG. 7 is an example flowchart showing the flow of halation removal processing.
- the predetermined luminance threshold value is, for example, a value near the luminance of the surface portion of the tooth where specular reflection is generated, which is obtained experimentally or theoretically in advance.
- FIG. 8 is a diagram showing a plurality of luminance distribution images showing the extracted high luminance region.
- each of the plurality of luminance distribution images BP 1 to BP 4 shows the extracted high luminance region AB (cross-hatching).
- the luminance distribution image BP 1 corresponds to the dental row image P 1
- BP 2 corresponds to P 2
- BP 3 corresponds to P 3
- BP 4 corresponds to P 4 .
- step S110 it is determined whether or not the high-luminance region AB exists in all of the plurality of dentition images. If the high-luminance region AB is present in at least one of the dentition images, the process proceeds to step S120. If this is not the case, that is, if the high-luminance region AB does not exist in all the dentition images, the process proceeds to step S200.
- step S120 the parameter k is set to 1 by the controller 62.
- step S130 the controller 62 calculates a degree of similarity, which is a numerical value indicating the degree of similarity between the high-luminance region AB of the dental image P 1 and the high-luminance region AB of the dental image P k + 1 . That is, the controller 62 functions as a high-luminance region comparison unit of the dentition imaging system 100 by operating according to the program stored in the memory 64.
- the similarity of the high-luminance regions A and B is calculated using, for example, template matching.
- template matching include SSD (Sum of Squared Difference), SAD (Sum of Absolute Difference), and NCC (Normalized Cross-Correlation).
- the sum of squares of the differences between the dentition image P 1 and the luminance values of the pixels of the luminance distribution images BP 1 and BP k + 1 corresponding to P k + 1 is calculated using the following mathematical formula 1.
- the reciprocal of the calculated value R SSD is taken as the degree of similarity between the high-luminance regions.
- T (i, j) is the luminance distribution of the pixel of the brightness distribution image BP 1 corresponding to the dentition image P 1
- I (i, j) is the luminance distribution corresponding to the dentition image P k + 1 . It is the luminance value of the pixel of the image BP k + 1 .
- the sum of the absolute values of the differences between the dentition image P 1 and the luminance values of the pixels of the luminance distribution images BP 1 and BP k + 1 corresponding to P k + 1 is calculated using the following mathematical formula 2.
- the reciprocal of the calculated value R SAD is defined as the degree of similarity between the high-luminance regions.
- T (i, j) is the luminance distribution of the pixel of the brightness distribution image BP 1 corresponding to the dentition image P 1
- I (i, j) is the luminance distribution corresponding to the dentition image P k + 1 . It is the luminance value of the pixel of the image BP k + 1 .
- the normalized cross-correlation of the luminance values of the dentition image P 1 and the luminance distribution images BP 1 and BP k + 1 corresponding to P k + 1 , respectively, is evaluated using the following mathematical formula 3.
- the evaluation value RNCC calculated using the formula 3 is a numerical value in the range of ⁇ 1.0 to +1.0, and the closer it is to +1.0, the higher the degree of similarity.
- T (i, j) is the luminance distribution of the pixel of the brightness distribution image BP 1 corresponding to the dentition image P 1
- I (i, j) is the luminance distribution corresponding to the dentition image P k + 1 . It is the luminance value of the pixel of the image BP k + 1 .
- step S140 the controller 62 determines the dentition image P1. It is determined whether or not there is a high-luminance region AB whose similarity is smaller than that of a predetermined similarity threshold. If present, the process proceeds to step S150. If not, the process proceeds to step S170.
- FIG. 9 shows a luminance distribution image showing a high luminance region in which the similarity is smaller than a predetermined similarity threshold value.
- the controller 62 identifies the region as a region AH (halation region) in which halation occurs in the dental image P1. That is, the controller 62 functions as a halation area specifying unit of the dentition imaging system 100 by operating according to the program stored in the memory 64.
- FIG. 10 is a diagram showing a trimming process and a compositing process.
- FIG. 11 shows a dentition image in which halation is partially removed by a trimming process and a compositing process.
- step S160 the controller 62 extracts the region Atri (trimming region) of the dentition image P k + 1 corresponding to the halation region A H of the dentition image P 1 .
- step S170 an image composition process is executed in which the halation region AH of the dental row image P1 is replaced with the trimming region Atri of the dental row image P k + 1 . That is, the controller 62 functions as a composition processing unit of the dentition imaging system 100 by operating according to the program stored in the memory 64.
- steps S160 and S170 as shown in FIG. 11, a dentition image P1 from which a part of halation H is removed is obtained (see FIG. 6).
- step S180 the parameter k is incremented by +1 by the controller 62.
- step S190 the controller 62 determines whether or not the parameter k is n-1.
- the parameter n is the number of dentition images.
- step S200 the controller 62 determines the dentition.
- the image P1 is output (displayed) via the touch screen 72 of the mobile terminal 70. That is, the touch screen 72 of the mobile terminal 70 functions as a dental image output unit of the dental imaging system 100.
- step S200 the process of step S200 is completed, the halation removal process is completed.
- FIG. 11 shows a dentition image from which halation has been removed.
- halation H is removed except for a part in the dental row image P1 (see FIG. 6).
- the remaining halation HR is the halation that occurs even if the lighting direction is changed. It can be estimated that this halation HR is caused by multiple reflections of the inlay packed in the tooth D. Therefore, the halation removal process is not executed on the halation HR , and the inlay appears on the dentition image P1.
- the high-luminance region AB of the dental image P1 whose similarity with each of the high -luminance regions AB of the other dental images P2 to P4 is larger than the predetermined similarity threshold value is It is presumed that the inlay is a region where it can exist, and that region is left as it is without image composition processing. As a result, in the dentition image in which the tooth D having the inlay is shown, the unnatural situation in which the inlay is not shown is suppressed.
- the teeth can be clearly photographed.
- the dentition imaging system according to the second embodiment is an improved form of the dentition imaging system according to the first embodiment described above, and is particularly suitable for photographing a dentition image including a tooth having an inlay. Is. Therefore, the second embodiment will be described with a focus on different points.
- FIG. 12 shows a dentition image including a tooth having an inlay and its brightness distribution.
- the luminance distribution shown in FIG. 12 shows the luminance distribution on the straight line XX passing through the gingiva, the tooth, the inlay, the tooth, and the gingiva in order in the tooth image P5.
- the brightness of the gingiva is the lowest and the brightness of the inlay is the highest.
- the exposure time of a plurality of dentition images required for the halation removing process as shown in FIG. 6 is shortened from the predetermined exposure time TEX .
- the dentition imaging system according to the second embodiment performs the following calibration process before capturing a plurality of dentition images required for the halation removal process.
- FIG. 13 is a flowchart showing the flow of the calibration process.
- step S300 the controller 62 acquires two dentition images for calibration processing from the image sensor 14.
- the two dentition images are taken under different lighting conditions and with different exposure times. Both of these exposure times may be different from the predetermined exposure time EX , or one of them may be the same.
- One dentition image is taken, for example, with only the first LED 26A lit.
- the other dentition image is taken, for example, with only the third LED 26C lit.
- step S310 the controller 62 extracts a high-luminance region AB exceeding a predetermined luminance threshold value in each of the two dentition images.
- step S320 the controller 62 determines whether or not the high-luminance region AB exists in the two dentition images. If present, the process proceeds to step S330. If this is not the case, the probability of whiteout occurring in the teeth when a plurality of dentition images required for the halation removal process are taken is low, so the calibration process is terminated.
- step S330 the controller 62 calculates the similarity between the high-brightness regions AB of the two dentition images.
- step S340 the controller 62 determines whether or not there is a high-luminance region AB whose similarity is larger than the predetermined similarity threshold value. If present, the process proceeds to step S350. If this is not the case, it is highly possible that the inlay does not exist, and the calibration process is terminated.
- step S350 the controller 62 determines whether or not the brightness values of the high-luminance regions AB of the two dentition images are different. If they are different, the process proceeds to step S360. If not, the process proceeds to step S400, and the controller 62 determines that the image sensor 14 has an abnormality. That is, the controller 62 functions as an imaging device abnormality determination unit of the dental imaging imaging system. The reason why such an abnormality determination can be performed is that even though the two dentition images are taken at different exposure times, the brightness values of the high-luminance regions A and B are not different and are the same. be. In order to determine the abnormality of the image pickup device with high accuracy, it is preferable that the difference in exposure time between the two dentition images is large.
- step S360 the controller 62 shortens the predetermined exposure time TEX when capturing a plurality of dentition images required for the halation removal process. That is, the high-luminance regions AB having high similarity and different luminance values are regions in which there is a high possibility that an inlay in which specular reflection is likely to occur exists. Therefore, in order to suppress whiteout in the inlay included in the plurality of dentition images required for the halation removal process, the predetermined exposure time TEX is shortened.
- step S370 the controller 62 identifies the high-luminance regions AB having high similarity and different luminance values as regions in which the inlay exists.
- step S380 the controller 62 identifies the type of inlay based on the color information (information that can be obtained from the dentition image such as color and gloss) of the high-luminance region AB specified as the region where the inlay exists. do. Therefore, the memory 64 stores color information such as colors and glosses of various types of inlays prepared in advance. By referring to the information in the memory 64, the controller 62 identifies the type of inlay in the high brightness region AB .
- step S390 the controller 62 stores the specified inlay type information in the memory 64.
- the information on the type of the inlay is output together with the dentition image when the inlay appears in the dentition image from which halation is removed as shown in FIG.
- the teeth can be clearly photographed as in the first embodiment described above.
- the intraoral camera may be configured with, for example, a 360 degree camera.
- the head portion 10a of the intraoral camera 10 shown in FIG. 1 may be configured to be rotatable 360 degrees with respect to the neck portion 10c, and a panoramic dentition image may be acquired.
- the first to fourth LEDs 26A to 26D which are lighting devices that irradiate the tooth to be imaged with light from different directions, are one as shown in FIG.
- a lighting condition for capturing one dentition image there may be a lighting condition in which two or more lighting devices are lit. Further, there may be a lighting condition in which all the lighting devices irradiate light or a lighting condition in which all the lighting devices are turned off.
- the first to fourth LEDs 26A to 26D are ON / OFF controlled, but the embodiment of the present disclosure is not limited to this.
- the lighting device may be, for example, a lighting device in which the amount of light can be adjusted.
- a lighting device with an adjustable amount of light it is possible to further increase the lighting conditions when photographing the teeth, and it is possible to increase a plurality of dentition images having different lighting conditions required for the halation removal process. Halation removal accuracy is improved by using a large number of dentition images.
- the light intensity of the lighting device may be adjusted automatically or manually before taking a plurality of dentition images having different lighting conditions required for the halation removal process.
- the brightness around the entrance of the intraoral camera may be measured using an illuminance sensor, and the amount of light of the lighting device may be adjusted based on the measurement result.
- the distance from the intraoral camera to the tooth to be imaged may be measured using a distance measuring sensor, and the amount of light of the lighting device may be adjusted based on the measurement result.
- the user may be able to adjust the amount of light of the lighting device through the touch screen 72 while checking the dentition image through the touch screen 72 of the mobile terminal 70.
- all of the first to fourth LEDs 26A to 26D output white light.
- some lighting devices may irradiate with ultraviolet light. When irradiated with ultraviolet light, plaque appears clearly in the dentition image. This makes it possible to check plaque using a dentition image.
- the head portion 10a of the intraoral camera 10 may be sterilized by ultraviolet light.
- a head cover that covers the entire head portion 10a is prepared.
- the inner surface of the head cover is mirror-finished.
- the ultraviolet light is reflected on the inner surface of the mirror-finished head cover and is irradiated on the head portion 10a.
- the head portion 10a is sterilized by ultraviolet light.
- the intraoral camera 10 With respect to the irradiation light of the lighting device, the intraoral camera 10, particularly a part of the head portion 10a and the neck portion 10c entering the oral cavity, is a film having high light absorption (for example, black paint) so as to suppress the reflection of light. ) Is preferred. As a result, the light reflected by the intraoral camera 10 is suppressed from being projected onto the teeth, that is, the occurrence of halation is suppressed. It was
- the user may be able to adjust the white balance of the dentition images.
- the user may be able to adjust the white balance through the touch screen 72 while checking the dentition image through the touch screen 72 of the mobile terminal 70.
- the intraoral camera may be subjected to anti-fog treatment. Since the humidity in the oral cavity is high, the components of the photographing optical system 12 such as the image sensor 14 and the lens 16 may get wet due to the humidity. As a countermeasure, for example, the transmissive surface of the lens 16 and the reflective surface of the mirror 18 may be water-repellent. Further, for example, the air around the image sensor 14 and the lens 16 may be warmed so as not to get wet (so that dew condensation does not occur). A heater may be used as a heat source for warming the air.
- the air may be heated by the exhaust heat from the electronic component supplied and driven from the battery 66.
- the dentition image may be determined that the lens 16 or the cover 28 is wet, and the user may be notified of this.
- the head portion 10a of the intraoral camera 10 Is in contact with the gum G.
- the position fixing of the head portion 10a of the intraoral camera 10 in the oral cavity is not limited to this.
- the neck portion 10c may be provided with a seating surface such as a flat surface or a concave surface on which the upper lip or the lower lip is seated.
- a spacer is provided in the intraoral camera 10 in order to acquire a plurality of dentition images with different lighting conditions required for the halation removal process in a better condition, and in order to make it easier to photograph the back teeth or the outer surface close to the back teeth. You may.
- FIG. 14 is a perspective view of a part of the intraoral camera in the dental imaging system of another embodiment.
- the head portion 210a of the intraoral camera 210 is provided with spacers 210d extending in the extending direction of the optical axis LA of the photographing optical system and having round ends at both ends.
- spacers 210d By arranging the spacer 210d between the gum near the back teeth and the inner portion of the cheek facing the back teeth, a space is formed between the cheeks and the outer surface of the back teeth. As a result, an appropriate distance for photographing is secured between the incident port 212a of the photographing optical system and the outer surface of the back teeth.
- the spacer 210d is preferably removable from the head portion 210a in consideration of photographing teeth other than the back teeth.
- the dentition imaging system may teach the user such as the photographing procedure.
- an intraoral image for example, an illustration
- the position of the target tooth to be imaged next by the user is taught using the intraoral image.
- the head portion 10a of the intraoral camera 10 is aligned with the tooth taught by the user, the type, shooting direction, angle of view, etc. of the tooth are determined based on the dentition image, and an appropriate shooting direction, angle of view, etc. are determined. Teach the user.
- the intraoral camera 10 photographs the teeth.
- the head portion 10a is configured to be rotatable with respect to the neck portion 10c, and a motor for rotating the head portion 10a is mounted on the intraoral camera 10, so that the shooting direction can be adjusted without the intervention of the user. can.
- the type of tooth can be specified by performing image recognition on the image of the tooth reflected in the dentition image. As a result, when the user aligns the head portion 10a with respect to a tooth different from the tooth to be imaged next, the mistake can be pointed out to the user.
- the dentition imaging system 100 is composed of a toothbrush-shaped intraoral camera 10 and a mobile terminal 70, as shown in FIGS. 1 and 3. Further, the intraoral camera 10 is equipped with LEDs 26A to 26D which are lighting devices, an image sensor 14 which is an image pickup device, a controller 62 which executes halation removal processing, and the like. Then, the mobile terminal 70 outputs the dentition image.
- the embodiments of the present disclosure are not limited to this.
- the controller that executes the halation removal process may be in the mobile terminal. That is, the CPU, MPU, or the like mounted on the mobile terminal executes the halation removal process of the dentition image.
- a personal computer may be used instead of the mobile terminal, and the intraoral camera may be connected to the personal computer by USB or the like.
- the camera equipped with a lighting device and a photographing device, and at least a part of which enters the oral cavity is not limited to the toothbrush-shaped intraoral camera.
- the form of the camera does not matter as long as the portion provided with the incident port of the lighting device or the photographing optical system can be freely moved in the oral cavity.
- the photographing optical system including the photographing device and the lighting device may be mounted on the head portion of the electric toothbrush.
- the dentition imaging system includes a plurality of lighting devices that irradiate the tooth to be imaged with light from different directions, and lighting conditions of the plurality of lighting devices.
- the brightness exceeds a predetermined brightness threshold for each of the photographing device that captures the first and second dentition images in which the teeth are captured and the first and second dentition images that are different and have a predetermined exposure time.
- the high-brightness region extraction unit that extracts the high-brightness region, and the high-brightness region comparison unit that calculates the degree of similarity indicating the degree of similarity between the high-brightness regions of the first and second dentition images, and the similarity.
- the degree When the degree is smaller than the predetermined similarity threshold value, it corresponds to the halation area specifying portion that specifies the high-brightness region of the first dentition image as the halation region and the halation region of the first dentition image.
- An image composition processing unit that extracts a trimming area in the second dentition image and replaces the halation area with the trimming area, and an image composition processing unit that performs image composition processing, and the first dentition image that has undergone image composition processing. It includes a dentition image output unit to be output.
- the dentition image taking method is, in a broad sense, a dentition image taking method for taking a dentition image including a tooth to be taken, and the dentition image is taken by a plurality of lighting devices.
- the teeth are irradiated with light from different directions, and the lighting conditions of the plurality of lighting devices differ depending on the photographing device, and the first and second dentition images in which the teeth are captured are photographed at a predetermined exposure time.
- a high-brightness region in which the brightness exceeds a predetermined brightness threshold is extracted, and the degree of similarity between the high-brightness regions of the first and second dentition images is obtained.
- the indicated similarity is calculated, and when the similarity is smaller than the predetermined similarity threshold, the high-brightness region of the first dentition image is specified as the halation region, and the second corresponding to the halation region.
- the trimming region in the dentition image of 2 is extracted, an image synthesizing process of replacing the halation region with the trimming region is executed, and the first dentition image processed by the image synthesizing is output.
- the present disclosure is applicable to devices, systems, and methods that capture the dentition and output the dentition image.
Abstract
Description
撮影対象の歯牙に対してそれぞれ異なる方向から光を照射する複数の照明デバイスと、
前記複数の照明デバイスの照明条件が異なり且つ所定の露光時間で前記歯牙が写る第1および第2の歯列画像を撮影する撮影デバイスと、
前記第1および第2の歯列画像それぞれについて輝度が所定の輝度しきい値を超えている高輝度領域を抽出する高輝度領域抽出部と、
前記第1および第2の歯列画像の高輝度領域間の類似の程度を示す類似度を算出する高輝度領域比較部と、
前記類似度が所定の類似度しきい値に比べて小さい場合、前記第1の歯列画像の高輝度領域をハレーション領域として特定するハレーション領域特定部と、
前記第1の歯列画像のハレーション領域に対応する前記第2の歯列画像におけるトリミング領域を抽出し、前記ハレーション領域を前記トリミング領域に差し換える画像合成処理を実行する画像合成処理部と、
画像合成処理された前記第1の歯列画像を出力する歯列画像出力部と、を含む歯列画像撮影システムが提供される。
撮影対象の歯牙を含む歯列画像を撮影する歯列画像撮影方法であって、
複数の照明デバイスによって撮影対象の歯牙に対してそれぞれ異なる方向から光を照射し、
撮影デバイスによって前記複数の照明デバイスの照明条件が異なり且つ所定の露光時間で前記歯牙が写る第1および第2の歯列画像を撮影し、
前記第1および第2の歯列画像それぞれについて輝度が所定の輝度しきい値を超えている高輝度領域を抽出し、
前記第1および第2の歯列画像の高輝度領域間の類似の程度を示す類似度を算出し、
前記類似度が所定の類似度しきい値に比べて小さい場合、前記第1の歯列画像の高輝度領域をハレーション領域として特定し、
前記ハレーション領域に対応する前記第2の歯列画像におけるトリミング領域を抽出し、
前記ハレーション領域を前記トリミング領域に差し換える画像合成処理を実行し、
画像合成処理された前記第1の歯列画像を出力する、歯列画像撮影方法が提供される。
図1は、本開示の実施の形態1に係る歯列画像撮影システムにおける口腔内カメラの斜視図である。図2は、口腔内カメラに組み込まれた撮影光学系を概略的に示す断面図である。
本実施の形態2に係る歯列画像撮影システムは、上述の実施の形態1に係る歯列画像撮影システムの改良形態であって、特にインレーを備える歯牙を含む歯列画像の撮影に適した形態である。したがって、異なる点を中心にして、本実施の形態2について説明する。
Claims (8)
- 撮影対象の歯牙に対してそれぞれ異なる方向から光を照射する複数の照明デバイスと、
前記複数の照明デバイスの照明条件が異なり且つ所定の露光時間で前記歯牙が写る第1および第2の歯列画像を撮影する撮影デバイスと、
前記第1および第2の歯列画像それぞれについて輝度が所定の輝度しきい値を超えている高輝度領域を抽出する高輝度領域抽出部と、
前記第1および第2の歯列画像の高輝度領域間の類似の程度を示す類似度を算出する高輝度領域比較部と、
前記類似度が所定の類似度しきい値に比べて小さい場合、前記第1の歯列画像の高輝度領域をハレーション領域として特定するハレーション領域特定部と、
前記第1の歯列画像のハレーション領域に対応する前記第2の歯列画像におけるトリミング領域を抽出し、前記ハレーション領域を前記トリミング領域に差し換える画像合成処理を実行する画像合成処理部と、
画像合成処理された前記第1の歯列画像を出力する歯列画像出力部と、を含む歯列画像撮影システム。
- 前記第1および第2の歯列画像に高輝度領域が含まれない場合、前記歯列画像出力部が前記第1の歯列画像を出力する、請求項1に記載の歯列画像撮影システム。
- 前記撮影デバイスが、異なる照明条件の下で且つ互いに異なる露光時間で第3および第4の歯列画像を撮影し、
前記高輝度領域抽出部が、前記第3および第4の歯列画像の高輝度領域を抽出し、
前記高輝度領域比較部が、前記第3および第4の歯列画像の高輝度領域の類似度を算出し、
前記第3および第4の歯列画像の高輝度領域間の類似度が前記所定の類似しきい値に比べて大きい場合、前記撮影デバイスが、前記所定の露光時間を短縮して前記第1および第2の歯列画像を撮影する、請求項1または2に記載の歯列画像撮影システム。
- 前記第3および第4の歯列画像の高輝度領域の輝度値が同一である場合、前記撮影デバイスに異常が生じていると判定する撮影デバイス異常判定部を、さらに含む、請求項3に記載の歯列画像撮影システム。
- 類似度が前記所定の類似しきい値に比べて大きい高輝度領域をインレーが存在する領域と特定し、前記高輝度領域の色情報と予め用意された複数の種類のインレーの色情報とに基づいて、インレーの種類を特定するインレー種類特定部を、さらに含む、請求項1から4のいずれか一項に記載の歯列画像撮影システム。
- 前記照明デバイスと前記撮影デバイスが、歯ブラシ状の筺体に組み込まれている、請求項1から5のいずれか一項に記載の歯列画像撮影システム。
- 前記歯列画像出力部が、歯列画像を表示可能なスクリーンを備える携帯端末である、請求項6に記載の歯列画像撮影システム。
- 撮影対象の歯牙を含む歯列画像を撮影する歯列画像撮影方法であって、
複数の照明デバイスによって撮影対象の歯牙に対してそれぞれ異なる方向から光を照射し、
撮影デバイスによって前記複数の照明デバイスの照明条件が異なり且つ所定の露光時間で前記歯牙が写る第1および第2の歯列画像を撮影し、
前記第1および第2の歯列画像それぞれについて輝度が所定の輝度しきい値を超えている高輝度領域を抽出し、
前記第1および第2の歯列画像の高輝度領域間の類似の程度を示す類似度を算出し、
前記類似度が所定の類似度しきい値に比べて小さい場合、前記第1の歯列画像の高輝度領域をハレーション領域として特定し、
前記ハレーション領域に対応する前記第2の歯列画像におけるトリミング領域を抽出し、
前記ハレーション領域を前記トリミング領域に差し換える画像合成処理を実行し、
画像合成処理された前記第1の歯列画像を出力する、歯列画像撮影方法。
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