CN-122003202-A - Image processing method, image processing apparatus, and program

Abstract

An image processing method displays a tartar region based on an image obtained by photographing a tooth and tartar having a fluorescence reaction caused by irradiating the tooth with light of a wavelength band including blue light, wherein a natural tooth region in the tooth region is detected based on the image (S201 to S206), a tartar region is detected based on the image (S207), and the tartar region is displayed only in the natural tooth region (S105). For example, in the image processing method, the 1 st region may be detected in the detection of the natural tooth region, and the natural tooth region may be detected based on the 1 st region, wherein the 1 st region is (i) a region having a luminance value equal to or greater than a1 st threshold value set in advance in all pixel regions of the image, or (ii) a region having a green pixel value equal to or greater than a2 nd threshold value set in advance in all pixel regions of the image.

Inventors

• History of Hamazaki
• OHTSUKA YOSHIO
• Nan Qiaokuan

Assignees

• 松下知识产权经营株式会社

Dates

Publication Date

20260508

Application Date

20241004

Priority Date

20231012

Claims (8)

1. 1. An image processing method for displaying a dental plaque region based on an image obtained by photographing a tooth and dental plaque having a fluorescence reaction caused by irradiating light of a wavelength band including blue light to the tooth, wherein, Based on the image, a natural tooth region in the region of the tooth is detected, Based on the image, a tartar region is detected, Is limited to the natural tooth area and shows a tartar area.
2. 2. The image processing method according to claim 1, wherein, In the detection of the natural tooth region, a1 st region is detected, and the natural tooth region is detected based on the 1 st region, wherein the 1 st region is (i) a region having a luminance value equal to or greater than a1 st threshold value set in advance in all pixel regions of the image, or (ii) a region having a green pixel value equal to or greater than a2 nd threshold value set in advance in all pixel regions of the image.
3. 3. The image processing method according to claim 2, wherein, In the detection of the natural tooth region, a region in which the difference between the green pixel value, the red pixel value, and the blue pixel value in the 1 st region is smaller than a3 rd threshold value set in advance is detected as the natural tooth region.
4. 4. An image processing method according to claim 2 or 3, wherein, In the detection of the region of the natural tooth, Based on the hue of the image, a gingival area is detected, The natural tooth region is detected as a region excluding the gum region from the 1 st region.
5. 5. An image processing method according to claim 2 or 3, wherein, In the detection of the natural tooth region, a region obtained by excluding a region having an area smaller than a predetermined area from the 1 st region is detected as the natural tooth region.
6. 6. An image processing method according to claim 2 or 3, wherein, In the detection of the natural tooth region, a region in which the boundary of the 1 st region is expanded outward by a predetermined amount is detected as the natural tooth region.
7. 7. An image processing apparatus for displaying a dental plaque region based on an image obtained by capturing a dental plaque and a dental plaque having a fluorescence response caused by irradiation of light of a wavelength band including blue light to the dental plaque, comprising: A natural tooth region detection unit that detects a natural tooth region in a region of the tooth based on the image; a tartar region detection unit for detecting a tartar region based on the image, and And a display unit for displaying the dental plaque region only in the natural dental region.
8. 8. A program for causing a computer to execute the image processing method according to claim 1.

Description

Image processing method, image processing apparatus, and program Technical Field The present disclosure relates to an image processing method, an image processing apparatus, and a program. Background Devices for detecting tartar based on an image obtained by capturing teeth in the oral cavity are known. For example, patent document 1 discloses a technique of storing a care site of an oral cavity and an amount of dental calculus detected in correspondence with the care site. Further, patent document 2 discloses a technique of correcting a tooth image. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2013-042906 Patent document 2 Japanese patent application laid-open No. 2009-37414 Disclosure of Invention Problems to be solved by the invention In such a device for detecting tartar, it is desirable to improve the detection accuracy of tartar. Accordingly, the present disclosure provides an image processing method or an image processing apparatus capable of improving detection accuracy of tartar. Means for solving the problems An image processing method according to an embodiment of the present disclosure displays a tartar region based on an image obtained by capturing a tooth and tartar in a fluorescence reaction caused by irradiation of light of a wavelength band including blue light to the tooth, wherein a natural tooth region in a region of the tooth is detected based on the image, a tartar region is detected based on the image, and the tartar region is displayed only in the natural tooth region. Effects of the invention The present disclosure can provide an image processing method or an image processing apparatus capable of improving detection accuracy of tartar. Drawings Fig. 1 is a perspective view of an intraoral camera in an intraoral camera system of an embodiment. Fig. 2 is a cross-sectional view schematically showing an imaging optical system of an intraoral camera incorporated in the intraoral camera system of the embodiment. Fig. 3 is a schematic configuration diagram of an intraoral camera system according to an embodiment. Fig. 4 is a diagram showing a flow of operations in the intraoral camera system according to the embodiment. Fig. 5 is a functional block diagram of the mobile terminal according to the embodiment. Fig. 6 is a flowchart of the image generation process of the embodiment. Fig. 7 is a diagram showing an example of an RGB image (4 th RGB image) according to the embodiment. Fig. 8 is a view showing an example of the 1 st natural tooth area according to embodiment. Fig. 9 is a view showing an example of a gum region according to the embodiment. Fig. 10 is a view showing an example of the 2 nd natural tooth area according to embodiment. Fig. 11 is a view showing an example of the 1 st tartar region of the embodiment. Fig. 12 is a diagram showing an example of a mask image according to the embodiment. Fig. 13 is a view showing an example of the 2 nd tooth region according to the embodiment. Fig. 14 is a diagram showing an example of a display image according to the embodiment. Detailed Description When blue light is irradiated into the oral cavity for the purpose of detecting dental calculus, the blue light is reflected on the surface of a prosthesis made of gold, silver, or the like. Thus, light of a red wavelength included in blue light may be erroneously detected as red fluorescence from tartar. In addition, when a user photographs the tooth surface with a hand-held intraoral camera, it is difficult to distinguish red fluorescence of tartar from reflected light on the surface of the prosthesis. In view of the above problems, the present disclosure detects a natural tooth region other than an artificial tooth region such as a prosthesis, and enables tartar detection only in the natural tooth region. This can prevent false detection of tartar due to a prosthesis or the like. An image processing method according to an embodiment of the present disclosure displays a tartar region based on an image obtained by capturing a tooth and tartar in a fluorescence reaction caused by irradiation of light of a wavelength band including blue light to the tooth, wherein a natural tooth region in a region of the tooth is detected based on the image, a tartar region is detected based on the image, and the tartar region is displayed only in the natural tooth region. This makes it possible to suppress false detection of dental calculus such as a prosthesis. Therefore, the image processing method can improve the detection accuracy of tartar. For example, in the image processing method, a1 st region may be detected in the detection of the natural tooth region, and the natural tooth region may be detected based on the 1 st region, wherein the 1 st region is (i) a region having a luminance value equal to or greater than a1 st threshold value set in advance in all pixel regions of the image, or (ii) a region having a green pixel value equal to or greater tha