Intraoral scanner with calibration function and intraoral scanning system including same

Abstract

The present invention proposes an oral scanner having a calibration function capable of performing calibration independently without a separate device for calibration by providing a calibration tool in an internal area of ​​the oral scanner that is not utilized for scanning. The oral scanner may include a housing with an internal space formed therein, a reflector disposed inside the housing to transmit light incident from a subject, a calibration unit having a preset pattern formed therein to be utilized for performing calibration, and an image sensor unit that generates an image by detecting light incident from the subject through the reflector and light incident from the calibration unit.

Description

Technology Field

[0001] The present invention relates to digital healthcare. More specifically, it relates to an oral scanner having a calibration function and an oral scanning system including the same, wherein a calibration tool is provided in an internal area of ​​the oral scanner not used for scanning, so that calibration can be performed autonomously without a separate device for calibration. Background Technology

[0002] Intraoral scanning is the process of creating a digitized 3D model by reconstructing the appearance of teeth and periodontal tissues within the oral cavity in three dimensions. Conventionally, impression taking, which involves taking a mold of the oral cavity using impression material, was used to reproduce the appearance of the oral cavity; however, with the advancement of CAD (Computer Aided Design) and CAM (Computer Aided Manufacture) technologies, it has become possible to reproduce the appearance of the oral cavity using digitized means.

[0003] The principles for implementing an oral scanner can be broadly classified into triangulation technique, confocal laser scanner microscopy (CLSM), active wavefront sampling and device methods.

[0004] As described above, errors may occur in the 3D model obtained by the oral scanner due to temperature, humidity, physical impact, etc. Accordingly, periodic calibration of the oral scanner is essential to obtain an accurate 3D model.

[0005] Generally, conventional oral scanners have had problems such as loss, contamination, or damage to the calibration kit, as the calibration kit is provided as a separate accessory for calibration work.

[0006] In addition, conventional oral scanners require periodic manual calibration, which can lead to labor loss, and there was a problem where the reliability of the device was affected if the calibration was performed by a user who was inexperienced in the task. Prior art literature

[0007] Korean Patent Publication No. 10-2018-0126177, 'Calibration device for oral scanner and oral scanner system including the same', (Published Nov. 27, 2018) The problem to be solved

[0008] One objective of the present invention is to provide an oral scanner having a calibration function that can perform calibration independently without a separate device for calibration by providing a calibration tool in an internal area of ​​the oral scanner that is not used for scanning.

[0009] Another objective of the present invention is to provide an oral scanning system capable of performing calibration independently without a separate device by providing a calibration tool in an internal area of ​​the oral scanner that is not utilized for scanning.

[0010] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0011] To achieve the technical objectives described above, the present invention proposes an oral scanner having a calibration function capable of performing calibration independently without a separate device for calibration, by providing a calibration tool in an internal area of ​​the oral scanner that is not utilized for scanning. The oral scanner may include a housing with an internal space, a reflector disposed inside the housing to transmit light incident from a subject, a calibration unit having a preset pattern formed thereon to be utilized for performing calibration, and an image sensor unit that generates an image by detecting light incident from the subject and light incident from the calibration unit through the reflector.

[0012] The calibration unit is characterized by being positioned in the light region incident from the interior region of the housing among the light incident on the image sensor unit.

[0013] To achieve the technical objectives described above, the present invention proposes an oral scanning system capable of performing calibration independently without a separate device for calibration by providing a calibration tool in an internal area of ​​the oral scanner that is not utilized for scanning. The oral scanning system may include an oral scanner comprising a housing having an internal space, a reflector disposed inside the housing and transmitting light reflected from a subject, a calibration unit having a preset pattern formed therein and utilized for performing calibration, and an image sensor unit that generates an image by detecting light reflected from the subject through the reflector and light reflected from the calibration unit, and a computing device that performs calibration based on the image generated through the light reflected and detected from the calibration unit.

[0014] Specific details of other embodiments are included in the detailed description and drawings. Effects of the invention

[0015] According to embodiments of the present invention, a calibration tool is provided in an internal area of ​​the oral scanner that is not used for scanning, so that calibration can be performed automatically when the oral scanner is idle without a separate device for calibration.

[0016] This allows for the reduction of manpower loss due to manual calibration and ensures the reliability of the calibration process.

[0017] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person skilled in the art to which the present invention pertains from the description in the claims. Brief explanation of the drawing

[0018] FIG. 1 is a configuration diagram showing an oral scanning system according to one embodiment of the present invention. FIG. 2 is a perspective view of an oral scanner according to one embodiment of the present invention. FIG. 3 is a bottom perspective view of an oral scanner according to one embodiment of the present invention. FIG. 4 is a perspective view showing the internal configuration of an oral scanner according to one embodiment of the present invention. FIG. 5 is a side view showing the internal configuration of an oral scanner according to one embodiment of the present invention. FIG. 6 is a top view showing the internal configuration of an oral scanner according to one embodiment of the present invention. FIG. 7 is an exemplary diagram showing a stereo image obtained by an oral scanner according to one embodiment of the present invention. FIG. 8 is a perspective view showing the internal configuration of an oral scanner according to another embodiment of the present invention. FIG. 9 is an illustrative diagram for explaining the optical path of an oral scanner according to another embodiment of the present invention. FIG. 10 is an exemplary diagram showing a stereo image obtained by an image sensor unit according to another embodiment of the present invention. FIG. 11 is a perspective view showing the internal configuration of an oral scanner according to another embodiment of the present invention. FIG. 12 is an illustrative diagram for explaining the optical path of an oral scanner according to another embodiment of the present invention. FIG. 13 is an exemplary diagram showing a stereo image obtained by an image sensor unit according to another embodiment of the present invention. FIG. 14 is a perspective view showing the internal configuration of an oral scanner according to another embodiment of the present invention. Figure 15 is a cross-sectional view along line aa' of Figure 14. FIG. 16 is an illustrative diagram for explaining the optical path of an oral scanner according to another embodiment of the present invention. FIG. 17 is an exemplary diagram showing a stereo image obtained by an image sensor unit according to another embodiment of the present invention. FIG. 18 is a perspective view showing the internal configuration of an oral scanner according to another embodiment of the present invention. FIG. 19 is an illustrative diagram for explaining the optical path of an oral scanner according to another embodiment of the present invention. FIG. 20 is an exemplary diagram showing a stereo image obtained by an image sensor unit according to another embodiment of the present invention. FIG. 21 is a configuration diagram showing the logical configuration of a computing device according to one embodiment of the present invention. Specific details for implementing the invention

[0019] It should be noted that technical terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Furthermore, unless specifically defined otherwise in this specification, technical terms used herein shall be interpreted in the sense generally understood by those skilled in the art to which the invention pertains, and shall not be interpreted in an overly broad or overly narrow sense. Additionally, if a technical term used in this specification is an incorrect technical term that fails to accurately express the spirit of the invention, it shall be understood as being replaced by a technical term that can be correctly understood by those skilled in the art. Moreover, general terms used in the invention shall be interpreted according to their prior definitions or the context, and shall not be interpreted in an overly narrow sense.

[0020] Additionally, singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "have" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as potentially including some of the components or steps, or including additional components or steps.

[0021] Additionally, terms including ordinal numbers, such as first, second, etc., used herein may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0022] When it is stated that one component is "connected" or "connected" to another component, it may be directly connected or connected to that other component, or there may be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0023] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols are given the same reference number, and redundant descriptions thereof will be omitted. Furthermore, in describing the present invention, if it is determined that a detailed description of related known technology may obscure the essence of the present invention, such detailed description will be omitted. Additionally, it should be noted that the attached drawings are intended only to facilitate an easy understanding of the concept of the present invention and should not be interpreted as limiting the concept of the present invention. The concept of the present invention should be interpreted as extending to all modifications, equivalents, and substitutions other than those shown in the attached drawings.

[0025] Meanwhile, conventional oral scanners provided a calibration kit in the form of a separate accessory for calibration, which led to problems such as loss, contamination, and damage to the calibration kit.

[0026] In addition, conventional oral scanners require periodic manual calibration, which can lead to labor loss, and there was a problem where the reliability of the device was affected if the calibration was performed by a user who was inexperienced in the task.

[0027] To overcome these limitations, the present invention proposes various means to perform calibration independently without the need for a separate device for calibration.

[0029] FIG. 1 is a configuration diagram showing an oral scanning system according to one embodiment of the present invention.

[0030] As illustrated in FIG. 1, the oral scanning system (700) may include an oral scanner (100) capable of scanning the three-dimensional structure inside the oral cavity of a dental patient and a computing device (600) connected to the oral scanner (100).

[0031] For example, the oral scanner (100) can be inserted into the oral cavity of a dental patient by a dental medical professional to scan the teeth non-contactually and capture multiple two-dimensional image data. Additionally, the oral scanner (100) can transmit the captured multiple two-dimensional image data to a computing device (600) or perform three-dimensional oral structure modeling based on the two-dimensional image data on its own.

[0032] The oral scanner (100) may be directly connected to a computing device (600) using a USB cable or the like, or connected via a network configured to enable wired or wireless communication. For example, depending on the installation environment, the network may be composed of an electrical connection line such as a copper cable, a wired network such as Ethernet, a wired home network (Power Line Communication), a telephone line communication device and RS-serial communication, a mobile communication network, a wireless network such as a WLAN (Wireless LAN), Wi-Fi, Bluetooth and ZigBee, or a combination thereof.

[0033] The oral scanner (100) can transmit and receive information and / or data, such as two-dimensional image data and three-dimensional oral structure model data, with the computing device (600). The oral scanner (100) and the computing device (600) may be configured to be physically separated as illustrated, but are not limited thereto. For example, the oral scanner (100) and the computing device (600) may be configured as an integrated unit.

[0034] In the following configuration, the computing device (600) can perform three-dimensional oral structure modeling based on at least two two-dimensional image data or stereo images obtained from the oral scanner (100). To perform this function, the computing device (600) may correspond to a computing device comprising a processor (e.g., CPU, GPU, AP, NPU, etc.) capable of performing image processing and three-dimensional modeling, and a memory capable of storing two-dimensional image data or three-dimensional oral structure model data. In one embodiment, the computing device (600) may be configured to transmit and receive information and / or data with the oral scanner (100). Specifically, the computing device (600) may transmit a command signal to the oral scanner (100) and receive image information of a target oral structure from the oral scanner (100).

[0035] Meanwhile, in the following description, the computing device (600) is described as controlling the overall operation of the oral scanner (100), but is not limited thereto and may be configured so that the oral scanner (100) performs some or all of the operations.

[0037] Hereinafter, an oral scanner according to one embodiment of the present invention will be described in detail.

[0038] FIG. 2 is a perspective view of an oral scanner according to one embodiment of the present invention, and FIG. 3 is a bottom perspective view of an oral scanner according to one embodiment of the present invention.

[0039] Referring to FIGS. 2 and FIGS. 3, the oral scanner (100) may be configured to be held by a user and may be configured so that at least a portion of it can be inserted into the oral cavity while held by the user.

[0040] To describe each component, the housing (10) forms the exterior of the oral scanner (100) and may be configured to accommodate the light source unit (20), the first optical system (30), the second optical system (40), the third optical system (50), and the image sensor unit (60) described later within it. The housing (10) may be formed in the shape of a long rod with one direction in the longitudinal direction, or it may be formed in any shape suitable for insertion into the oral cavity. Additionally, although the cross-section of the oral scanner (100) is depicted as being approximately rectangular, it is not limited thereto, and the cross-section may be configured to include at least one of a circular, streamlined, or polygonal shape. Furthermore, if the cross-section of the housing (10) is formed as a polygon, it may be configured to be rounded to provide a user's grip.

[0041] The housing (10) may include a first housing body (10a) and a second housing body (10b). A light source unit (20), a first optical system (30), a third optical system (50), and an image sensor unit (60) may be disposed inside the first housing body (10a), and a second optical system (40) may be disposed inside the second housing body (10b). The second housing body (10b) may be provided to be detachable from the first housing body (10a). When using the oral scanner (100), at least a portion of the oral scanner (100) may be inserted into the patient's oral cavity.

[0042] With this configuration, after using the oral scanner (100), the second housing body (10b) located in front of the oral scanner (100) can be separated from the first housing body (10a) and disinfected or washed separately.

[0043] The opening forming part (12) may be formed adjacent to one end of the housing (10). Specifically, the opening forming part (12) may be positioned adjacent to one end of the housing (10) to form an opening (12a) that connects the inside and outside of the housing (10) to the inside.

[0044] The opening forming portion (12) can be configured so that light generated or reflected inside the housing (10) is irradiated to the outside through the opening (12a), and external light can be introduced into the inside of the housing (10). In one embodiment, when the oral scanner (100) is inserted into the oral cavity, the opening (12a) can be configured to face the tooth requiring scanning.

[0046] Hereinafter, the internal configuration of an oral scanner according to one embodiment of the present invention will be described in detail.

[0047] FIG. 4 is a perspective view showing the internal configuration of an oral scanner according to one embodiment of the present invention, FIG. 5 is a side view showing the internal configuration of an oral scanner according to one embodiment of the present invention, FIG. 6 is a top view showing the internal configuration of an oral scanner according to one embodiment of the present invention, and FIG. 7 is an exemplary diagram showing a stereo image obtained by an oral scanner according to one embodiment of the present invention.

[0048] Referring to FIGS. 4 to 7, the oral scanner (100) may include a light source unit (20), a first optical system (30), a second optical system (40), a third optical system (50), and an image sensor unit (60).

[0049] The light source unit (20) may be configured to generate light. The light generated by the light source unit (20) may be configured to pass through optical systems. In this case, the light irradiated from the light source unit (20) may correspond to pattern light or structured light. The light pattern may be a fringe pattern, a linear pattern, a dot pattern, or any shape of pattern. For example, the light source unit (20) may irradiate a pattern that changes according to a preset time. When the pattern light is irradiated onto a subject (S), such as a tooth in the oral cavity, a deformation of the pattern may occur according to the three-dimensional structure of the surface of the subject (S). Thus, the three-dimensional structure of the subject (S) can be identified and modeled based on information regarding the deformation of the pattern projected onto the surface of the subject (S) or the change in the position of feature points.

[0050] The light source unit (20) may be positioned inside the housing (10). Specifically, the light source unit (20) may be configured to irradiate light onto the first optical system (30) described later. The aperture (12a) or the second optical system (40) may be positioned adjacent to one end of the housing (10), and the light source unit (20) may be positioned adjacent to the other end of the housing (10). Additionally, the light source unit (20) may be positioned at any intermediate point between one end and the other end of the housing (10). The positioning of the light source unit (20) is not limited, and this is satisfied if the light generated from the light source unit (20) is irradiated toward the first optical system (30) or the second optical system (40), preferably the first optical system (30).

[0051] The first optical system (30) may be configured to reflect light irradiated from the light source unit (20) toward the second optical system (40). The first optical system (30) may reflect light irradiated along the irradiation axis (LS) so that it moves along the width direction (X2) or along a first optical path (L1) spaced apart from the width direction (X2) and the height direction (X3). The width direction (X2) may refer to the left-right width direction perpendicular to the length direction (X1) of the oral scanner (100). The height direction (X3) may refer to the up-down height direction perpendicular to the length direction (X1) of the oral scanner (100). The width direction (X2) may be defined as the left-right direction, and the height direction (X3) may be defined as the up-down direction. For convenience of explanation, the length direction (X1) may be defined as the first direction, the width direction (X2) as the second direction, and the height direction (X3) as the third direction.

[0052] The first optical system (30) may include a first reflector (32) and a second reflector (34). The first reflector (32) may be configured to reflect light irradiated from the light source (20) toward the second reflector (34). The first reflector (32) may be positioned on the upper inner side of the housing (10). Additionally, the second reflector (34) may be configured to reflect light reflected by the first reflector (32) toward the second optical system (40). The second reflector (34) may be positioned spaced apart from the first reflector (32).

[0053] Light irradiated from the light source unit (20) can be reflected toward the second optical system (40) via the first reflector (32) and the second reflector (34) of the first optical system (30). The first reflector (32) of the first optical system (30) can form an irradiation axis (LS) with the light source unit (20), and the second reflector (34) of the first optical system (30) can form a first optical path (L1) with the second optical system (40). An optical path refers to the region through which light passes, or the central axis of the path through which light travels in space, and may be defined as an optical axis.

[0054] The light source unit (20) is positioned spaced apart from the first light path (L1), and the first and second reflective units (32, 34) may be configured to be tilted so that light emitted from the light source unit (20) can move along the set first light path (L1) to the second optical system (40). The tilted arrangement of the first and second reflective units (32, 34) will be explained again later.

[0055] The second optical system (40) reflects light irradiated from the second reflector (34) of the first optical system (30) toward the subject (S), and the light reflected from the subject (S) can be reflected by the second optical system (40) toward the third optical system (50).

[0056] The second optical system (40) may include at least one reflective part. This may be defined as the third reflective part (42). For example, the second optical system (40) may be at least one mirror. In one embodiment, the second optical system (40) may be placed at or around the opening (12a). For example, the second optical system (40) may be fixedly placed on the inner surface of the housing (10) adjacent to the opening (12a).

[0057] The third optical system (50) may be configured to reflect light reflected from the outside to the second optical system (40) to the image sensor unit (60). Specifically, the third optical system (50) may reflect light reflected from the subject (S) by the second optical system (40) toward the image sensor unit (60). The third optical system (50) may include one or more reflective parts or mirrors for reflecting light.

[0058] The first to third optical systems (30, 40, 50) may be arranged to be aligned along a reference line (AL) passing through the first optical path (L1). The reference line may be defined as a reference axis. As the first to third optical systems (30, 40, 50) are aligned along the reference line (AL), the travel distance of the light can be minimized. By doing so, the light that is scattered as it passes through the optical systems is minimized, thereby minimizing aberrations and obtaining clear and high contrast even to the periphery of the object, thus improving optical performance.

[0059] Additionally, the first to third optical systems (30, 40, 50) may be placed on a virtual plane through which a reference line (AL) passes. The reference line (AL) may refer to an extension line extending from the first optical path (L1). An image sensor unit (60) may also be placed on the plane. The virtual plane is arranged so that the reference line (AL) passes through it, and the plane may refer to a plane extending in the height direction from the reference line (AL). In this embodiment, the plane may be configured to pass through the center of the oral scanner (100).

[0060] The third optical system (50) may be positioned adjacent to the second reflective portion (34) of the first optical system (30). Specifically, the third optical system (50) may be positioned adjacent to the other side of the reflective surface where light is reflected from the second reflective portion (34) of the first optical system (30).

[0061] The third optical system (50) may include a fourth reflector (52) and a fifth reflector (54). A pair of fourth reflectors (52) may be provided, and the pair of fourth reflectors (52) may reflect light reflected from the second optical system (40) toward the fifth reflector (54). The second optical system (40) may form a pair of second optical paths (L2) with the third optical system (50). Specifically, the pair of second optical paths (L2) may be formed by the second optical system (40) and the pair of fourth reflectors (52) of the third optical system (50). Since the pair of fourth reflectors (52) are configured to be spaced apart from each other, the pair of second optical paths (L2) may be configured to spread apart in the width direction (X2) from each other. A pair of second optical paths (L2) may be formed identically in the height direction, but are not limited thereto. The centerlines of the pair of second optical paths (L2) may be arranged parallel to the first optical path (L1).

[0062] The second reflector (34) of the first optical system (30) can be positioned between a pair of fourth reflectors (52). Specifically, the second optical system (40) and the pair of fourth reflectors (52) can form a square area (BA), and the second reflector (34) of the first optical system (30) can be positioned in the square area (BA). Through this, the second reflector (34) of the first optical system (30) can be positioned so as not to interfere with light reflected from the second optical system (40) toward the pair of fourth reflectors (52) of the third optical system (50). Through this configuration, the first optical path (L1) and the pair of second optical paths (L2) can be positioned so as not to interfere with each other, and the components inside the housing (10) can be positioned more densely.

[0063] A pair of fourth reflectors (52) can form a gap between them. By forming a gap between the pair of fourth reflectors (52), light reflected by the fourth reflectors (52) and irradiated from the fifth reflector (54) can pass through the gap and reach the image sensor (60). Here, the position and direction of each of the pair of fourth reflectors (52) can be set so that the two images of the subject (S) detected by the image sensor (60) by the two reflective surfaces of the fifth reflector (54) do not overlap, and each image is fully visible.

[0064] A pair of fifth reflectors (54) may be provided, and the pair of fifth reflectors (54) may be configured to reflect light reflected from a pair of fourth reflectors (52) toward the image sensor unit (60). Specifically, the pair of fifth reflectors (54) may each reflect light reflected from a pair of fourth reflectors (52) toward the image sensor unit (60). The light reflected from the pair of fifth reflectors (54) may pass through a gap formed between the pair of fourth reflectors (52) and reach the image sensor unit (60). Here, the position and direction of each of the pair of fifth reflectors (54) may be set so that the two images of the subject (S) reflected by the fifth reflectors (54) and detected by the image sensor unit (60) do not overlap, and each image is fully visible.

[0065] A pair of fifth reflectors (54) may be connected to each other at one corner. For example, a pair of fifth reflectors (54) may be configured in the form of adjacent triangular prisms as shown in the drawings.

[0066] In one embodiment, the first optical system (30), the second optical system (40), or the third optical system (50) may each be fixedly positioned at a predetermined location inside the housing (10). In this case, a driving unit for adjusting the angle of the first optical system (30), the second optical system (40), or the third optical system (50) may not be installed inside the housing (10). As such, since there is no need to place other electronic or mechanical components in the area where the first optical system (30), the second optical system (40), and the third optical system (50) are placed inside the housing (10), the components inside the housing (10) can be densely arranged. Therefore, since the optimal structure of the housing (10) can be designed from the dense structure of the first optical system (30), the second optical system (40), and the third optical system (50), an oral scanner (100) with a small volume and free scanning operation within the oral cavity can be realized.

[0067] In one embodiment, the angle formed by a pair of fourth reflectors (52) is a double angle, i.e., an angle smaller than 180 degrees, and the angle formed by a pair of fifth reflectors (54) is a double angle, i.e., an angle larger than 180 degrees.

[0068] The image sensor unit (60) may be configured to detect light reflected from the third optical system (50). Specifically, the image sensor unit (60) may be configured to detect light reflected from the third optical system (50) and passing through the lens assembly (90) and the sensor reflection unit (94). In one embodiment, the image sensor unit (60) may be configured to acquire two stereo images from the light reflected from the third optical system (50). Specifically, the image sensor unit (60) may acquire images of two lights reflected by the fifth reflection unit (54) of the third optical system (50) together. In this way, the oral scanner (100) can acquire two stereo images through the third optical system (50) using only one image sensor unit (60). The two stereo images acquired from the image sensor unit (60) may be used for 3D oral structure modeling executed by a processor.

[0069] In this embodiment, the fourth and fifth reflective parts (52, 54) are described as each having one reflective surface, but the fourth and fifth reflective parts (52, 54) may include two or more reflective surfaces (n). In this case, the stereo images obtained from the image sensor part (60) can obtain 2n stereo images.

[0070] The image sensor unit (60) may be placed inside the housing (10). Specifically, the image sensor unit (60) may be placed adjacent to the other end of the housing (10). The image sensor unit (60) may be configured so that light reflected from the fifth reflection unit (54) of the third optical system (50) is incident thereon.

[0071] Through these configurations, light irradiated from the light source unit (20) can be reflected in the direction of the second optical system (40) by the first reflector (32) and the second reflector (34) of the first optical system (30), and the light reflected from the second reflector (34) can be reflected in the direction of a subject (S) located outside the housing (10) through the second optical system (40) and the aperture (12a). Additionally, the light reflected from the subject (S) can be reflected in the direction of the fourth reflector (52) of the third optical system (50) by the second optical system (40). The light reflected by the fourth reflector (52) can be reflected in the direction of the image sensor unit (60) by the fifth reflector (54).

[0072] Referring to FIG. 7, the image sensor unit (60) may be configured to detect light reflected from the third optical system (50). The image sensor unit (60) may be configured to acquire two stereo images (Ia, Ib) from the light reflected from the third optical system (50). Specifically, the image sensor unit (60) may acquire two stereo images (Ia, Ib) that are each reflected by a pair of fifth reflectors (54) of the third optical system (50). Based on the two stereo images (Ia, Ib) acquired in this way, the processor may extract depth data and, based on this, perform 3D modeling of the oral structure of the subject (S).

[0074] Hereinafter, the configuration of an oral scanner according to another embodiment of the present invention will be described.

[0075] FIG. 8 is a perspective view showing the internal configuration of an oral scanner according to another embodiment of the present invention, FIG. 9 is an illustrative diagram for explaining the optical path of an oral scanner according to another embodiment of the present invention, and FIG. 10 is an illustrative diagram showing a stereo image obtained by an image sensor unit according to another embodiment of the present invention.

[0076] Meanwhile, the oral scanner (200) according to another embodiment of the present invention has substantially the same configuration as the oral scanner (100) according to one embodiment of the present invention, except for some configurations. Therefore, repetitive descriptions are omitted, and the same reference numerals are assigned to identical configurations.

[0077] Meanwhile, in the above description regarding FIGS. 1 to 7, the reflector included in the second optical system (40) was defined as the fourth reflector (42), but in the following description, it will be described as the reflector (42).

[0078] As illustrated in FIGS. 8 and 9, an oral scanner (102) according to another embodiment of the present invention may include a housing (10), a light source unit (20), a reflector unit (42), an image sensor unit (60), and a calibration unit (170).

[0079] The calibration unit (170) may be composed of at least one specimen (171). Here, the specimen (171) may be placed inside the housing (10). Specifically, the specimen (171) may be placed on the inner surface of the second housing body (10b), such that the pattern surface of the specimen faces the image sensor unit (60) and forms an optical path for calibration.

[0080] The specimen (171) may be provided to form a vertical surface with the inner surface of the second housing body (10b), and may also be provided in a shape tilted at a certain angle toward the image sensor part.

[0081] The light path incident on the image sensor unit (60) may include a light area (A) that is incident by reflection from the subject and used for scanning, and a light area (B) that is incident by reflection on the inner surface of the second housing body (10b) excluding the light area (A).

[0082] The specimen (171) can be placed in the light region (B) that is reflected and incident on the inner surface of the second housing body (10b). The light reflected from a part of the inner surface of the second housing body (10b) is detected by the image sensor unit (60) but is not substantially utilized for oral scanning.

[0083] Accordingly, the specimen (171) is placed in the light area (B) that is reflected and incident on the inner surface of the second housing body (10b), thereby enabling calibration to be performed using light that is not substantially used for scanning.

[0084] A specimen (171) may have a pre-set pattern formed for calibration. Specifically, the specimen (171) may include at least one specimen having a pattern formed of one or more pre-set colors. For example, the specimen (171) may be a checker board in which a pattern of squares composed of multiple colors is arranged according to a certain rule.

[0085] FIG. 9 is an example diagram showing the light path incident on the image sensor unit (60).

[0086] The light path incident on the image sensor unit (60) may include a first light region (A) that is reflected from the subject and incident through the reflection unit (42), and a second light region (B) that is reflected and incident on the inner surface of the second housing body (10b).

[0087] The first light region (A) includes light reflected from the subject and incident through the reflection part (42), so it can be substantially utilized for scanning the subject. On the other hand, the second light region (B) includes light reflected from the inner surface of the second housing body (10b), so it is detected by the image sensor part (60) but may not be substantially utilized for scanning the subject.

[0088] Accordingly, an oral scanner (200) according to another embodiment of the present invention places a specimen (171) in a second light area (B) that is not substantially utilized for scanning a subject, thereby enabling self-calibration without a separate procedure or device for calibration.

[0089] Referring to FIG. 10, two stereo images (Ia, Ib) acquired by the image sensor unit (60) may include a first region (A) that detects light on a subject and a second region (B) that detects light on a specimen (171). At this time, as shown in (a), the first region (A) may be formed at the center of each of the stereo images (Ia, Ib), and the second region (B) may be formed at the lower part of the first region (A). However, it is not limited thereto, and as shown in (b), the second region (B) may be formed at the upper part of the first region (A) when the image is inverted.

[0090] In FIG. 9, the specimen (171) is shown as being provided on the upper inner surface of the second housing body (10b), but it can be provided at various locations on the inner surface of the second housing body (b), such as the left and right sides and the lower side, as long as it is out of the light area (A) from the subject.

[0092] Hereinafter, the configuration of an oral scanner according to another embodiment of the present invention will be described.

[0093] FIG. 11 is a perspective view showing the internal configuration of an oral scanner according to another embodiment of the present invention, FIG. 12 is an illustrative diagram for explaining the optical path of an oral scanner according to another embodiment of the present invention, and FIG. 13 is an illustrative diagram showing a stereo image obtained by an image sensor unit according to another embodiment of the present invention.

[0094] Meanwhile, the oral scanner (300) according to another embodiment of the present invention has substantially the same configuration as the oral scanner (100) according to one embodiment of the present invention, except for some configurations. Therefore, repetitive descriptions are omitted, and the same reference numerals are assigned to identical configurations.

[0095] As illustrated in FIGS. 11 and 12, an oral scanner (202) according to another embodiment of the present invention may include a housing (10), a reflector (42), an image sensor (60), and a calibration unit (270).

[0096] The calibration unit (270) may be composed of at least one specimen (271). Here, the specimen (271) may be placed inside the housing (10). Specifically, the specimen (271) may be placed on the inner surface of the second housing body (10b) and may be placed parallel to the first optical path (L1) between the reflection unit (42) and the image sensor unit (60). That is, the specimen (271) may be placed in close contact with the upper surface of the second housing body (10b) while being placed parallel to the upper surface of the second housing body (10b). Through this, the specimen (271) can provide a calibration image of a relatively large size despite the narrow space of the second housing body (10b), thereby increasing the calibration accuracy.

[0097] Referring to FIG. 13, two stereo images (Ia, Ib) acquired by the image sensor unit (60) may include a first region (A) that detects light on a subject and a second region (B) that detects light on a specimen (271). At this time, as shown in (a), the first region (A) may be formed at the center of each of the stereo images (Ia, Ib), and the second region (B) may be formed at the lower part of the first region (A). However, it is not limited thereto, and as shown in (b), the second region (B) may be formed at the upper part of the first region when the image is inverted.

[0099] FIG. 14 is a perspective view showing the internal configuration of an oral scanner according to another embodiment of the present invention, FIG. 15 is a cross-sectional view along line aa' of FIG. 14, FIG. 16 is an illustrative diagram for explaining the optical path of an oral scanner according to another embodiment of the present invention, and FIG. 17 is an illustrative diagram showing a stereo image acquired by an image sensor unit according to another embodiment of the present invention.

[0100] Meanwhile, the oral scanner (400) according to another embodiment of the present invention has substantially the same configuration as the oral scanner (100) according to one embodiment of the present invention, except for some configurations. Therefore, repetitive descriptions are omitted, and the same reference numerals are assigned to identical configurations.

[0101] As illustrated in FIGS. 14 and 15, an oral scanner (400) according to another embodiment of the present invention may include a housing (10), a reflector (42), an image sensor (60), and a calibration unit (370).

[0102] The calibration unit (370) may be composed of at least one specimen (371). Here, the specimen (371) may be placed inside the housing (10). Specifically, the specimen (371) may be placed on the inner surface of the second housing body (10b) and positioned perpendicularly to the first optical path (L1) between the reflection unit (42) and the image sensor unit (60).

[0103] As illustrated in FIGS. 15 and 16, the specimen (371) may be formed along the inner surface of the second housing body (10b). That is, the specimen (371) may be formed along the inner surface of the second housing body (10b) so that an opening may be formed in the center through which light can travel between the reflector (42) and the image sensor (60). At this time, a preset pattern for calibration may be printed on the surface of the specimen (371) facing the image sensor (60).

[0104] Referring to FIG. 17, two stereo images (Ia, Ib) acquired by the image sensor unit (60) may include a first region (A) that detects light on a subject and a second region (B) that detects light on a specimen (371). At this time, as shown in (a), the first region (A) may be formed at the center of each of the stereo images (Ia, Ib), and the second region (B) may be formed in a shape surrounding the first region (A). Through this, the specimen (371) can be supported to utilize a relatively large area among the areas that are not substantially utilized for scanning for calibration.

[0106] FIG. 18 is a perspective view showing the internal configuration of an oral scanner according to another embodiment of the present invention, FIG. 19 is an illustrative diagram for explaining the optical path of an oral scanner according to another embodiment of the present invention, and FIG. 20 is an illustrative diagram showing a stereo image obtained by an image sensor unit according to another embodiment of the present invention.

[0107] Meanwhile, the oral scanner (500) according to another embodiment of the present invention has substantially the same configuration as the oral scanner (100) according to one embodiment of the present invention, except for some configurations. Therefore, repetitive descriptions are omitted, and the same reference numerals are assigned to identical configurations.

[0108] As illustrated in FIGS. 18 and 19, an oral scanner (202) according to another embodiment of the present invention may include a housing (10), a reflector (42), an image sensor (60), and a calibration unit (470).

[0109] The calibration unit (470) may be configured to include a reflector (471) and at least one specimen (472).

[0110] The reflector (471) is positioned on the inner surface of the second housing body (10b) to reflect light incident from the specimen (472) to a preset position. At this time, the reflector (471) may be positioned at a certain angle tilted on the second housing body (10b) so that the light incident from the specimen (472) and the light reflected to the image sensor unit (60) can form an angle of intersection.

[0111] By providing a reflector (471) between the specimen (471) and the image sensor unit (60), a relatively long focal length between the image sensor unit (60) and the specimen (472) can be secured.

[0112] At least one specimen (472) may be positioned on the light path incident from the first housing body (10a) or the second housing body (10b) to the image sensor unit (60) through the reflector (471). For example, a plurality of specimens (472) may be arranged at the bottom of the second housing body (10b) so as to face the reflector (471).

[0113] In addition, by using a reflector (471), a light path for calibration can be secured even if the position of the specimen (472) is provided inside the first housing body (10a).

[0114] Referring to FIG. 20, two stereo images (Ia, Ib) acquired by the image sensor unit (60) may include a first region (A) that detects light on a subject and a second region (B) that detects light on a specimen (371). At this time, as shown in (a), the first region (A) may be formed at the center of each of the stereo images (Ia, Ib), and the second region (B) may be formed at the lower part of the first region (A). However, it is not limited thereto, and as shown in (b), the second region (B) may be formed at the upper part of the first region (A) when the image is inverted.

[0116] FIG. 21 is a configuration diagram showing the logical configuration of a computing device according to one embodiment of the present invention.

[0117] As illustrated in FIG. 21, a computing device (600) according to one embodiment of the present invention may be configured to include a communication unit (605), an input / output unit (610), a control unit (615), and a storage unit (625).

[0118] Since the components of such a computing device (600) merely represent functionally distinct elements, two or more components may be implemented as a single integrated unit in an actual physical environment, or a single component may be implemented as a separate unit in an actual physical environment.

[0119] To explain each component, the communication unit (605) can transmit and receive data with the oral scanner according to the various embodiments described above.

[0120] Specifically, the communication unit (605) can receive an image of a subject from an oral scanner. Here, the image may be an image generated based on light reflected from the subject after irradiating light onto teeth and periodontal tissues within the oral cavity. Additionally, the communication unit (605) may transmit a guide signal to the oral scanner according to the state of the oral scanner. Here, the guide signal may be a signal instructing the output of one or more of light, sound, and vibration.

[0121] With the following configuration, the input / output unit (610) can receive or output various types of data required or generated during the oral scanning process.

[0122] Specifically, the input / output unit (610) can receive a scan target range related to oral scanning. In this case, the scan target range is a range where scanning must be performed to create a model of the teeth and periodontal tissues in the oral cavity.

[0123] Additionally, the input / output unit (610) can output an image being scanned by an oral scanner in real time. In this case, the image being scanned may be any one of the screens regarding the upper jaw, lower jaw, and occlusion of the patient, but is not limited thereto. Also, the input / output unit (610) can output a composite image generated by oral scanning. In this case, the composite image is a model of the teeth and periodontal tissues in the oral cavity generated by synthesizing one or more scanned images.

[0124] With the following configuration, the control unit (615) can generate an oral model of the subject based on an image reflected from the subject (A) and detected by the image sensor unit.

[0125] Specifically, when images scanned by an oral scanner are received continuously, the control unit (615) can reconstruct the continuously received images to create a single three-dimensional model.

[0126] For example, the control unit (615) can extract a feature point for each of the continuously received images and align the images by 3D matching corresponding feature points among the extracted feature points. Then, the oral model generation unit (215) can reconstruct the aligned images to generate a single 3D model. Meanwhile, if there is a difference in illumination between the images, the control unit (615) can additionally perform brightness correction work, etc., before reconstruction.

[0127] In addition, the control unit (615) can perform calibration of the image sensor unit based on an image detected by the image sensor unit and reflected from the specimen according to the various embodiments described above.

[0128] Specifically, the control unit (615) can extract the RGB (Red, Green, Blue) values ​​of an image of at least one specimen detected from the image sensor unit, and correct the color of the image sensor unit by comparing the extracted RGB values ​​with the RGB values ​​of a previously stored reference image.

[0129] That is, the control unit (615) can pre-store RGB values ​​for a reference image of a specimen taken at the time of manufacturing, and can perform color correction so that the RGB values ​​of an image of at least one specimen detected by the image sensor unit have the RGB values ​​of the pre-stored reference image.

[0130] Additionally, the control unit (615) can estimate parameter values ​​of the image sensor unit based on an image of at least one specimen and monitor the state of the image sensor unit based on the estimated parameter values.

[0131] Specifically, the control unit (615) can extract internal parameters and external parameters of the image sensor unit through an image of at least one specimen detected from the image sensor unit.

[0132] Here, internal parameters may include focal length, center of image, lens distortion, etc. External parameters may include the position and orientation of the image sensor unit (150).

[0133] For example, the control unit (615) can identify corners based on the size and number of specimens in an image of a specimen acquired by the image sensor unit. Here, the control unit (615) can identify corners of the specimen through a reference image corresponding to the specimen, the number of internal corners per row and column of the specimen, and an output array of detected corners.

[0134] Subsequently, the control unit (615) can identify a feature point corresponding to a corner based on a feature point located at the top or bottom of the specimen. Here, a corner may refer to an edge of the grid, or it may refer to a vertex where the corners constituting the grid meet. For example, the control unit (615) can determine the corners of the grids using at least one of a geometric classifier and a neural network model.

[0135] Subsequently, the control unit (615) can determine a homography matrix through the identified corner. Here, the homography matrix may refer to a matrix representing the relationship between the real 3D coordinate system and the image coordinate system. Then, the control unit (615) can extract internal parameters and external parameters for calibration of the image sensor unit based on the homography matrix.

[0136] Meanwhile, distortion in the parameter values ​​of the image sensor unit may occur due to distortion of the image sensor unit itself, structural distortion of the optical system, etc. Accordingly, the control unit (615) can determine the state of the oral scanner based on the extracted internal parameters and external parameters of the image sensor unit.

[0137] In one embodiment, if the difference between the extracted parameter value and the parameter value of the reference image exceeds a preset value, the control unit (615) determines that the cause of the abnormal state of the oral scanner is an internal factor of the image sensor unit and can correct the parameter value of the image sensor unit based on the parameter value of the reference image.

[0138] That is, the control unit (615) can perform calibration by correcting the parameter value of the image sensor unit based on the parameter value of the reference image when it is determined that the difference between the extracted parameter value and the parameter value of the reference image is within a calibrated range through self-parameter correction of the image sensor unit.

[0139] Additionally, if the difference between the estimated parameter value and the parameter value of the reference image exceeds a preset value, the control unit (615) determines that the cause of the abnormal state of the oral scanner is an external factor of the image sensor unit and can output a guide signal corresponding to the type of external factor.

[0140] That is, if the control unit (615) determines that calibration is impossible through self-parameter correction of the image sensor unit based on the difference between the extracted parameter value and the parameter value of the reference image, it can output a guide signal that allows the user to perform a separate calibration.

[0141] For example, if the control unit (615) determines that the abnormal condition of the oral scanner is caused by an optical system, which is one of the external factors, it can transmit a guide signal to the oral scanner that enables it to output a voice such as "Calibration of the optical system is required."

[0142] In another embodiment, the control unit (615) can estimate the state of the oral scanner by inputting the extracted parameter value into a pre-machine-learned artificial intelligence (AI) model based on the parameter value of the image sensor unit and the state information pair data corresponding to the parameter value.

[0143] That is, the control unit (615) can estimate the state of the oral scanner as one of internal factors and external factors through an artificial intelligence model capable of estimating the state of the oral scanner. Furthermore, the control unit (615) can estimate the type of state of the oral scanner through the artificial intelligence model.

[0144] The function of the control unit (615) described above is implemented in the computing device (600) as described above, but all or part thereof may also be implemented through a module provided inside the oral scanner.

[0146] As described above, preferred embodiments of the present invention have been disclosed in this specification and drawings; however, it is obvious to those skilled in the art that other variations based on the technical spirit of the present invention are possible in addition to the embodiments disclosed herein. Furthermore, although specific terms have been used in this specification and drawings, they are used merely in a general sense to facilitate the explanation of the technical content of the present invention and to aid in understanding the invention, and are not intended to limit the scope of the present invention. Accordingly, the detailed description above should not be interpreted restrictively in any respect and should be considered illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included within the scope of the present invention. Explanation of the symbols

[0148] 100, 200, 300, 400, 500: Oral scanner 10 : Housing 20 : Light source 30: 1st optical system 40: 2nd optical system 50: Third optical system 60: Image sensor section 170, 270, 370, 470: Calibration section 171, 271, 371, 472: Psalms 471 : Reflector 600: Oral Scanning System

Claims

Claim 1 A housing having an internal space formed therein; a reflector disposed inside the housing and transmitting light incident from a subject; a calibration unit having a preset pattern formed therein and utilized for performing calibration; and an image sensor unit that detects light incident from the subject and light incident from the calibration unit through the reflector to generate an image; wherein the calibration unit is disposed in the light region of the internal area of ​​the housing among the light incident to the image sensor unit, and the housing comprises: a first housing body having an internal space formed therein to accommodate a light source unit and the image sensor unit, with one end open; and a second housing body detachably coupled to the open end of the first housing body, having an internal space formed in communication with the first housing body and an opening formed on the path of light transmitted to the subject. An oral scanner comprising: a calibration unit disposed in the internal space of the first housing body or the second housing body, and further comprising a control unit that performs calibration based on an image generated through light reflected and detected from the calibration unit; wherein the control unit extracts parameter values ​​of the image sensor unit based on an image of at least one specimen and monitors the state of the oral scanner based on the extracted parameter values. Claim 2 A housing having an internal space formed therein; a reflector disposed inside the housing and transmitting light incident from a subject; a calibration unit having a preset pattern formed therein and utilized for performing calibration; and an image sensor unit that detects light incident from the subject and light incident from the calibration unit through the reflector to generate an image; wherein the calibration unit is disposed in a light region incident from an internal area of ​​the housing among the light incident to the image sensor unit, and the housing comprises a first housing body having an internal space formed therein and a light source unit and the image sensor unit disposed therein, with one end open; and a second housing body detachably coupled to the open end of the first housing body, having an internal space communicating with the first housing body and an opening formed on the path of light transmitted to the subject; and wherein the calibration unit is disposed on the inner surface of the second housing body and comprises at least one specimen having a pattern formed therein composed of one or more preset colors. An oral scanner comprising: a control unit that performs calibration based on an image generated through light reflected and detected from the calibration unit; wherein the control unit extracts parameter values ​​of the image sensor unit based on an image of at least one specimen and monitors the state of the oral scanner based on the extracted parameter values. Claim 3 A housing having an internal space formed therein; a reflector disposed inside the housing and transmitting light incident from a subject; a calibration unit having a preset pattern formed therein and utilized for performing calibration; and an image sensor unit that detects light incident from the subject and light incident from the calibration unit through the reflector to generate an image; wherein the calibration unit is disposed in a light region incident from an internal region of the housing among the light incident to the image sensor unit, and the housing comprises: a first housing body having an internal space formed therein to accommodate a light source unit and the image sensor unit, with one end open; and a second housing body detachably coupled to the open end of the first housing body, having an internal space communicating with the first housing body and an opening formed on the path of light transmitted to the subject; and wherein the calibration unit comprises at least one specimen having a preset pattern formed therein, provided inside the first housing body or the second housing body. The oral scanner comprises: a reflector provided on the inner surface of the second housing body and positioned opposite to the specimen to reflect light incident from the specimen to a preset position; and further comprises a control unit that performs calibration based on an image generated through light detected by being reflected from the calibration unit; wherein the control unit extracts parameter values ​​of the image sensor unit based on an image of the at least one specimen and monitors the state of the oral scanner based on the extracted parameter values. Claim 4 An oral scanner according to any one of claims 1 to 3, wherein the control unit extracts the RGB (Red, Green, Blue) values ​​of an image of at least one specimen detected from the image sensor unit, and corrects the color of the image sensor unit by comparing the extracted RGB values ​​with the RGB values ​​of a pre-stored reference image. Claim 5 An oral scanner according to any one of claims 1 to 3, wherein, when the difference between the extracted parameter value and the parameter value of the reference image exceeds a preset value, the control unit determines that the cause of the abnormal state of the oral scanner is an internal factor of the image sensor unit and corrects the parameter of the image sensor unit based on the parameter value of the reference image. Claim 6 In claim 5, the oral scanner is characterized in that the control unit estimates the state of the oral scanner by inputting the extracted parameter value into an artificial intelligence (AI) model that has undergone prior machine learning based on the parameter value of the image sensor unit and the state information pair data corresponding to the parameter value. Claim 7 An oral scanner according to any one of claims 1 to 3, wherein the control unit determines that the cause of the abnormal state of the oral scanner is an external factor of the image sensor unit when the difference between the extracted parameter value and the parameter value of the reference image exceeds a preset value, and outputs a guide signal corresponding to the type of the external factor. Claim 8 An oral scanner comprising: a housing having an internal space formed therein; a reflector disposed inside the housing and transmitting light incident from a subject; a calibration unit having a preset pattern formed therein and utilized for performing calibration; and an image sensor unit that detects light incident from the subject and light incident from the calibration unit through the reflector to generate an image; and a computing device that performs calibration based on an image generated through light reflected and detected from the calibration unit; wherein the calibration unit is disposed in a light region of the internal area of ​​the housing among the light incident to the image sensor unit, and the housing comprises: a first housing body having an internal space formed therein and a light source unit and the image sensor unit disposed therein, with one end open; and a second housing body detachably coupled to the open end of the first housing body, having an internal space formed in communication with the first housing body and an opening formed on the path of light transmitted to the subject. An oral scanning system comprising, wherein the calibration unit is disposed in the internal space of the first housing body or the second housing body, and the computing device performs calibration based on an image generated through light reflected and detected from the calibration unit, extracts parameter values ​​of the image sensor unit based on an image of at least one specimen, and monitors the status of the oral scanner based on the extracted parameter values. Claim 9 An oral scanner comprising: a housing having an internal space formed therein; a reflector disposed inside the housing and transmitting light incident from a subject; a calibration unit having a preset pattern formed therein and utilized for performing calibration; and an image sensor unit that detects light incident from the subject and light incident from the calibration unit through the reflector to generate an image; and a computing device that performs calibration based on an image generated through light reflected and detected from the calibration unit; wherein the calibration unit is disposed in a light region of the internal area of ​​the housing among the light incident to the image sensor unit, and the housing comprises: a first housing body having an internal space formed therein and a light source unit and the image sensor unit disposed therein, with one end open; and a second housing body detachably coupled to the open end of the first housing body, having an internal space formed in communication with the first housing body and an opening formed on the path of light transmitted to the subject. An oral scanning system comprising: a calibration unit disposed on the inner surface of the second housing body and having at least one specimen formed with a pattern composed of one or more preset colors; and a computing device performing calibration based on an image generated through light reflected and detected from the calibration unit, extracting parameter values ​​of the image sensor unit based on the image of the at least one specimen, and monitoring the status of the oral scanner based on the extracted parameter values. Claim 10 An oral scanner comprising: a housing having an internal space formed therein; a reflector disposed inside the housing and transmitting light incident from a subject; a calibration unit having a preset pattern formed therein and utilized for performing calibration; and an image sensor unit that detects light incident from the subject and light incident from the calibration unit through the reflector to generate an image; and a computing device that performs calibration based on an image generated through light reflected and detected from the calibration unit; wherein the calibration unit is disposed in a light region of the internal area of ​​the housing among the light incident to the image sensor unit, and the housing comprises: a first housing body having an internal space formed therein and a light source unit and the image sensor unit disposed therein, with one end open; and a second housing body detachably coupled to the open end of the first housing body, having an internal space formed in communication with the first housing body and an opening formed on the path of light transmitted to the subject. An oral scanning system comprising: a calibration unit having at least one specimen having a preset pattern formed thereon, which is provided inside the first housing body or the second housing body; and a reflector having a reflector positioned opposite to the specimen and reflecting light incident from the specimen to a preset position; wherein the computing device performs calibration based on an image generated through light reflected and detected from the calibration unit, extracts parameter values ​​of the image sensor unit based on the image of the at least one specimen, and monitors the state of the oral scanner based on the extracted parameter values. Claim 11 delete Claim 12 delete

Images