WO2013141502A1

WO2013141502A1 - Three-dimensional dental scanner and scanning method using same

Info

Publication number: WO2013141502A1
Application number: PCT/KR2013/001813
Authority: WO
Inventors: 추상완
Original assignee: Choo Sang Wan
Priority date: 2012-03-22
Filing date: 2013-03-06
Publication date: 2013-09-26
Also published as: KR101176770B1

Abstract

The present invention relates to a three-dimensional (3D) dental scanner and to a scanning method using same. The 3D dental scanner includes: a digital projector for forming a predetermined pattern with the light emitted by a light source and illuminating the target in the mouth with the patterned light; a camera for sensing a two-dimensional (2D) image formed by the patterned light that is reflected off the target in the mouth; an optical system for controlling the patterned light emitted onto the target in the mouth from the digital projector and the patterned light that is reflected off the target; a processor for transmitting predetermined pattern information to the digital projector, controlling the digital projector and the camera, and receiving the 2D image information captured by the camera; and a housing for accommodating the digital projector, the camera, the optical system, and the processor, wherein the patterned light is produced on the basis of predetermined programmed pattern image information.

Description

Dental 3D Scanner and Scanning Method Using the Same

The present invention relates to a dental three-dimensional scanner and a scanning method using the same, in more detail, the pattern is easy to manufacture, the pattern can be configured in various ways according to the desired shape, dental 3 excellent in the accuracy of the three-dimensional image A dimensional scanner and a scanning method using the same.

Dental 3-Dimensional scanner is a device for acquiring the same image information as the actual image of the subject by deriving a three-dimensional image from a two-dimensional image obtained by photographing a subject having a three-dimensional shape such as intraoral teeth to be. Dental three-dimensional scanner is used to obtain a three-dimensional image of the shape of the teeth and oral tissue during dental treatment, such as dental restoration, prosthetics.

Conventionally, in the dental prosthesis treatment, a lost-wax casting method in which a dental prosthetic treatment is performed through an impression acquisition process of manufacturing a plaster model of a patient's teeth is generally used. However, such a lost-wax casting method may cause infection by a material for casting, it is difficult to manufacture a prosthesis, and there is a problem in that a difference in shape between a prosthesis and a conventional tooth is large.

Therefore, recently, in order to solve this problem, the use of the so-called Cerec system (Cerec system), which measures the teeth and gums in the oral cavity using a three-dimensional camera and designs and manufactures the dental prosthesis using the CAD / CAM system, has increased. The trend is. However, the Serek system uses a pattern mask in the lens portion of the three-dimensional camera to obtain a three-dimensional image of the oral teeth and gums. The pattern mask is a panel having a predetermined pattern shape, and is manufactured by forming a desired pattern on one surface of a glass plate, and photographing a subject with a 3D camera while moving the pattern mask from side to side. And a 3D image is derived from the plurality of 2D images. However, in the case of using a conventional pattern mask, since the desired pattern must be formed directly on the glass plate, it is difficult to form a pattern, and in order to use another pattern in addition to the manufactured pattern, a separate pattern mask must be manufactured, and the cost of manufacturing the pattern mask is high. There was a problem of high and long time. In addition, when using such a pattern mask, it is difficult to accurately measure the 3D image of the desired teeth and gums, there was a problem that the accuracy of the 3D image of the original teeth and gums is low.

1 is a schematic cross-sectional view of a conventional 3D camera. As shown in FIG. 1, a conventional 3D camera includes a housing 1, a light source 2, a pattern mask 3, an aperture 4; 5, a prism 6, and an image sensor 7. do. That is, the light emitted from the light source 2 passes through the pattern mask 3 and emits light having a desired pattern to the aperture 4. In addition, the emitted light is refracted through the prism 1 and then irradiated onto the subject S. FIG. Then, the irradiated light is reflected by the subject S, and the reflected light is refracted by the prism 1 and reaches the image sensor 7 through the aperture 5. This image acquisition process is subjected to a plurality of image acquisition process, the pattern mask 3, the desired pattern is formed in this process is continuously acquired while moving in the horizontal direction by a separate power transmission. Then, the two-dimensional image obtained from the image sensor 7 is converted into three-dimensional image data by using a triangulation method.

However, such a three-dimensional scanner using a conventional 3D camera and a scanning method using the same have low image accuracy, difficulty in producing a pattern mask, difficult pattern mask control for obtaining a 3D image, and difficulty in miniaturizing a device. there was.

In order to solve the problems of the prior art, the present inventors do not need to manufacture and use a separate pattern mask, and can variously configure the pattern according to a desired shape, and can obtain various fine pattern images. The dental 3D scanner and the scanning method using the same have been developed.

An object of the present invention is to provide a dental three-dimensional scanner and a scanning method using the same that does not need to manufacture and use a separate pattern mask.

Another object of the present invention is to provide a dental three-dimensional scanner and a scanning method using the same that can be configured in a variety of patterns according to the desired form.

Another object of the present invention is to provide a dental three-dimensional scanner and a scanning method using the same that can obtain a variety of fine pattern image.

Another object of the present invention is to provide a dental three-dimensional scanner excellent in the accuracy of the three-dimensional image and a scanning method using the same.

The above and other objects of the present invention can be achieved by the present invention described below.

Dental three-dimensional scanner according to the present invention comprises a digital projector for forming a predetermined pattern in the light emitted from the light source to irradiate the pattern light to the subject in the oral cavity; A camera for sensing a two-dimensional image formed by reflected light reflected by the patterned light to the subject in the oral cavity; An optical system for controlling patterned light emitted from the digital projector to the intraoral subject and reflected light reflected by the patterned light to the intraoral subject; A processor for transmitting predetermined pattern information to the digital projector, controlling the digital projector and the camera, and receiving 2D image information sensed by the camera; And a housing accommodating the digital projector, a camera, an optical system, and a processing unit, wherein the pattern light is implemented from programmed predetermined pattern image information.

Here, the optical system is characterized in that it further comprises an optical component for adjusting the path of the patterned light and reflected light at the end of the housing.

The housing is characterized by consisting of a housing for receiving a digital projector, a camera and an optical system and a separate housing for separately receiving a processing unit.

The digital projector may further include a storage unit capable of storing predetermined pattern information.

The storage unit may be a removable storage device detachable from the digital projector.

The 3D scanner may further include a computer capable of transmitting predetermined pattern information stored in a processing unit or converting 2D image information received in the processing unit into 3D image information.

Each of the processing unit and the computer further includes a wireless transmission device, wherein predetermined pattern information stored in the computer is wirelessly transmitted to the processing unit, and two-dimensional image information received from the processing unit is wirelessly transmitted to the computer.

In addition, the scanning method using a dental three-dimensional scanner according to the present invention, the step of transmitting a predetermined pattern image information programmed by the computer to the digital projector including a light source (S10); The digital projector emitting a pattern light including a pattern image implemented from the predetermined pattern image information to an intraoral subject through an optical system (S20); Acquiring 2D image information by photographing the light reflected by the emitted pattern light from the subject in the oral cavity and passing through the optical system (S30); Receiving, by the processor, the acquired 2D image information and transmitting the same to the computer (S40); And converting the two-dimensional image information transmitted to the computer into a three-dimensional image (S50), wherein the steps S10 to S50 are performed by a dental three-dimensional scanner and a computer. A digital projector may include: a digital projector that forms a predetermined pattern in light emitted from a light source and emits pattern light to an intraoral subject; A camera for sensing a two-dimensional image formed by reflected light reflected by the patterned light to the subject in the oral cavity; An optical system for controlling patterned light emitted from the digital projector to the intraoral subject and reflected light reflected by the patterned light to the intraoral subject; A processor for transmitting predetermined pattern information to the digital projector, controlling the digital projector and the camera, and receiving 2D image information sensed by the camera; And a housing accommodating the digital projector, the camera, the optical system, and the processing unit.

The step S10 may include a storage unit for storing the predetermined pattern image information by the digital projector, and further comprising storing the programmed predetermined pattern image information transmitted from the computer by the storage unit of the digital projector. do.

In the step S40, the processing unit and the computer each further include a wireless transmission device, predetermined pattern information stored in the computer is wirelessly transmitted to the processing unit, and the 2D image information received by the processing unit is wirelessly transmitted to the computer. do.

Dental three-dimensional scanner and a scanning method using the same according to the present invention does not need to manufacture and use a separate pattern mask, and has the effect of the invention can be configured in a variety of patterns according to the desired form. In addition, the present invention can obtain a variety of fine pattern image, and has the effect of the invention that the precision of the three-dimensional image is excellent.

1 is a schematic cross-sectional view of a conventional 3D camera.

Figure 2 is a cross-sectional view schematically showing the appearance of a three-dimensional dental scanner according to the present invention.

Figure 3 is a cross-sectional view schematically showing the appearance of a dental three-dimensional scanner with a detachable housing according to the present invention.

Figure 4 is a flow chart schematically showing a scanning method using a three-dimensional dental scanner according to the present invention.

The above objects, features and other advantages of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. Hereinafter, a dental three-dimensional scanner and a scanning method using the same according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

Figure 2 is a cross-sectional view schematically showing the appearance of a dental three-dimensional scanner according to the present invention, Figure 3 is a cross-sectional view schematically showing the appearance of a dental three-dimensional scanner having a detachable housing according to the present invention.

As shown in FIG. 2, the dental three-dimensional scanner according to an embodiment of the present invention includes a digital projector 10 including a light source 11, a camera 20, an optical system 30, and a housing 40. And a processing unit 50.

The digital projector 10 includes a light source 11, and forms a predetermined pattern emitted from the light source 11 to irradiate the subject light with the pattern light. The digital projector 10 can freely manufacture and replace a desired pattern by programming without processing a desired pattern on one surface of a glass plate and separately producing a pattern mask, and has the advantage of forming a fine pattern. The digital projector 10 may use a liquid crystal display (LCD) projector, a liquid crystal on silicon (LCOS) projector, or a digital light processing (DLP) projector. For example, a DLP projector uses a digital micromirror device (DMD) chip so that one micromirror corresponds to one pixel, and the micromirror adjusts a reflection angle according to a signal to implement an image. It works. When using such a digital projector there is an advantage that can provide a high-definition and high brightness image. In addition, the digital projector of the present invention may be configured to further include a storage unit (not shown) capable of storing predetermined pattern information. The storage unit may be configured to be mounted on a digital projector, but may be configured as a removable storage device such as a universal serial bus (USB) detachable from the digital projector. When the digital projector is configured to further include a storage unit, there is no need to separately receive pattern information from an external device, thereby increasing the data processing speed.

Camera 20 is a device for sensing a two-dimensional image formed by the reflected light reflected on the subject (S) by the pattern light formed by the digital projector 10, it is preferable to use a digital camera. For example, when a digital camera is used, pattern light is formed by the digital projector 10, and the pattern light is irradiated to the subject S through the optical system 30 and the lens unit 60. When the pattern light is irradiated, a pattern of a specific pattern appears on the surface of the subject S according to the three-dimensional shape of the subject, and the specific pattern pattern includes information on the three-dimensional shape of the subject S. FIG. The pattern formed on the surface of the subject S reaches the camera 20 through the optical system 30. The pattern of a specific pattern reaching the camera 20 is sensed and stored as the 2D image by a memory device such as a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS).

The optical system 30 is an aggregate of pattern light emitted from the digital projector 10 to the subject S and a lens for controlling the reflected light reflected by the pattern light to the subject S. The pattern light and the reflected light Maintain parallel light or adjust light path. In addition, the optical system 30 may include a collimating lens capable of improving the resolution of the 2D image formed by the reflected light by preventing image collapse due to diffraction, but is not limited thereto. In addition, the optical system 30 may further include an optical component 31 capable of adjusting a path of patterned light and reflected light at the distal end of the housing 40 as shown in FIG. 2. By configuring the optical component 31 at the distal end as described above, it is possible to solve the problem due to the space constraints to photograph the teeth in the narrow intraoral space. The optical component 31 may be formed of a prism or a mirror, but is not limited thereto. In addition, the optical system 30 may be configured in a fixed form, but may be configured to mechanically control the focal length and the like to obtain more precise parallel light or adjust the optical path.

The processor 50 transmits predetermined pattern information to the digital projector 10, controls the digital projector 10 and the camera 20, and receives 2D image information sensed by the camera 20. For example, the processor 50 receives at least one patterned two-dimensional image received from the camera 20. In addition, the 3D scanner of the present invention further includes a computer 80 capable of transmitting the stored predetermined pattern information to the processing unit 50 or converting the 2D image information received by the processing unit 50 into 3D image information. Can be configured. The computer 80 means expansion of a processing unit for computer processing, but not hardware. In more detail, when the computer 80 is configured to further include the computer 80, the computer 80 is intended to expand the function of the processor, and the computer and the processor are not to be physically clearly separated from each other. That is, the processing unit and the computer of the present invention may be a computer device for information processing, and the functions performed in the processing unit may be performed in the computer. It may be performed in the processing unit 50. When the computer and the 3D scanner are interconnected, various pattern image information can be freely provided to the 3D scanner, and since the 2D image information can be converted into 3D image information, it can be usefully used as a 3D scanning system. have. In addition, the processor 50 and the computer 80 may each be configured to further include a wireless transmitter (not shown). When the processing unit 50 and the computer 80 are configured to include a wireless transmission device, the processing unit 50 and the computer 80 may be configured as a wireless transmission system such as Wi-Fi (Wireless Fidelity) or Bluetooth (Bluetooth). In addition, the processing unit 50 may further include a function of controlling the optical system when the optical system 30 is configured to be mechanically controlled.

The housing 40 is a casing that accommodates the light source 11, the digital projector 10, the camera 20, the optical system 30, and the processing unit 50, and the lens unit 60 at one end of the housing 40. When configured to include a three-dimensional scanner of the present invention when scanning the intraoral teeth by removing the inconvenience caused by spatial constraints in the oral cavity and directly irradiated pattern light on the subject (S) three-dimensional excellent accuracy It has the advantage of getting an image. In addition, the housing 40 may be configured to accommodate all of the digital projector 10, the camera 20, the optical system 30 and the processing unit 50, as shown in Figure 3, another embodiment of the present invention For example, the housing may be configured to accommodate the digital projector 10, the camera 20, the optical system 30, and the detachable housing 41 to separately accommodate the processing unit 50. In another embodiment, the processing unit 50 may be configured in a case of the computer 80. When the housing is configured to be separated as described above, when scanning the oral cavity by using the dental three-dimensional scanner of the present invention, it is possible to increase the convenience in use by reducing the volume and weight of the scanner.

As shown in FIG. 4, a scanning method using a dental three-dimensional scanner according to the present invention includes a three-dimensional image of an intraoral subject by a dental three-dimensional scanner including a digital projector, a light source, a camera, an optical system, a processor, and a housing. A system capable of accurately obtaining a three-dimensional image from a form, wherein a computer transmits programmed predetermined pattern image information to a digital projector including a light source (step S10), and the digital projector is configured to generate the predetermined pattern image information from the predetermined pattern image information. The pattern light including the implemented pattern image is passed through the optical system to the oral subject (step S20), the camera reflects the light reflected from the subject through the optical system by the emitted pattern light and the two-dimensional image Acquiring the information (step S30), the processor receives the two-dimensional image information and transmits to the computer The step (S40 step) and the step of converting the two-dimensional image information transmitted to the computer to the three-dimensional image (S50 step), the step S10 to S50 is a dental 3 according to FIG. It is carried out by a 3D scanner and a computer.

That is, when using a dental three-dimensional scanner according to an embodiment of the present invention, by forming a predetermined pattern on the light emitted from the light source to project the pattern light to the oral subjects; A camera for sensing a two-dimensional image formed by reflected light reflected by the patterned light to the subject in the oral cavity; An optical system for controlling patterned light emitted from the digital projector to the intraoral subject and reflected light reflected by the patterned light to the intraoral subject; A processor for transmitting predetermined pattern information to the digital projector, controlling the digital projector and the camera, and receiving 2D image information sensed by the camera; And a housing for accommodating the digital projector, the camera, the optical system, and the processing unit. 3.

Step S10 of the present invention is a step of transmitting the predetermined pattern image information manufactured by the programming of the computer to the digital projector including a light source. There is no need to separately manufacture the pattern mask, there is no need to drive the pattern mask from side to side to obtain 3D image information, and there is an advantage in that a fine and accurate digital pattern can be formed. In addition, the produced predetermined pattern image is converted into pattern image information and transmitted to a digital projector including a light source. The digital projector of the S10 stage may use a liquid crystal display (LCD) projector, a liquid crystal on silicon (LCOS) projector, or a digital light processing (DLP) projector. For example, a DLP projector uses a digital micromirror device (DMD) chip so that one micromirror corresponds to one pixel, and the micromirror adjusts a reflection angle according to a signal to implement an image. By operating in such a way, there is an advantage that it is possible to provide a high quality image and a high brightness image. The digital projector may further include a storage unit that stores predetermined pattern image information. Accordingly, step S10 may further include storing programmed predetermined pattern image information transmitted from a computer to a storage unit of the digital projector. In this case, when the storage unit of the digital projector is configured as a mobile storage device, there is an advantage in that the device can be simplified since the direct transmission of pattern image information is not required.

After the step S10, the digital projector goes through the step S20 for emitting the pattern light including the predetermined pattern image implemented from the predetermined pattern image information to the intraoral subject through the optical system. In step S20, the two-dimensional image having a variety of patterns is emitted to the intraoral subject with high accuracy. Therefore, the problem of the two-dimensional image caused by physically moving the conventional pattern mask to form various pattern lights can be largely solved. have.

After operation S20, the camera photographs the light reflected by the emitted pattern light from the subject in the oral cavity and passed through the optical system to acquire two-dimensional image information, and the processing unit includes the two-dimensional image information acquired by the camera. In step S40 of receiving and transmitting to the computer, and after step S40, the step S50 of converting two-dimensional image information transmitted to the computer into a three-dimensional image. As described above, since the 2D image has high accuracy and various patterns can be formed, a 3D image having high resolution can be obtained.

In addition, the light reflected from the oral subject by the pattern light including the predetermined pattern image of step S20 and the patterned light emitted from step S30 is controlled by the optical system. That is, the amount of light, the light incident angle, the light exit angle, and the like are finely controlled by the optical system to obtain an image having an excellent resolution and accuracy.

In addition, the step S40 may be configured such that the processing unit and the computer each further include a wireless transmission device. In this case, the predetermined pattern information is wirelessly transmitted from the computer to the processing unit, and the 2D image information received from the processing unit is wirelessly transmitted to the computer. The advantage is that the configuration of the system can be simplified in that it does not necessarily have to be wired as the device is transmitted.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described specific embodiment. That is, those skilled in the art to which the present invention pertains can make many changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes, modifications and All equivalents should be considered to be within the scope of the present invention.

The scanning method using the dental three-dimensional scanner according to the present invention can configure the dental three-dimensional scanner with a wired or wireless, in particular to provide a two-dimensional pattern image, and to obtain a precise three-dimensional image from the two-dimensional pattern image It can be usefully used as a dental three-dimensional system in that it can be.

Claims

In the scanner,

A digital projector which forms a predetermined pattern on the light emitted from the light source and irradiates the pattern light to the intraoral subject;

A camera for sensing a two-dimensional image formed by reflected light reflected by the patterned light to the subject in the oral cavity;

An optical system for controlling patterned light emitted from the digital projector to the intraoral subject and reflected light reflected by the patterned light to the intraoral subject;

A processor for transmitting predetermined pattern information to the digital projector, controlling the digital projector and the camera, and receiving 2D image information sensed by the camera; And

A housing accommodating the digital projector, a camera, an optical system, and a processing unit;

Wherein the pattern light is implemented from programmed predetermined pattern image information.
The dental three-dimensional scanner of claim 1, wherein the optical system further comprises an optical component for adjusting a path of patterned light and reflected light at an end of the housing.
The dental three-dimensional scanner of claim 1, wherein the housing comprises a housing housing a digital projector, a camera, and an optical system, and a detachable housing separately housing a processing unit.
The dental three-dimensional scanner of claim 1, wherein the digital projector further comprises a storage unit capable of storing predetermined pattern information.
The dental three-dimensional scanner of claim 4, wherein the storage unit is a removable storage device detachable from the digital projector.
According to claim 1, wherein the three-dimensional scanner further comprises a computer for transmitting the predetermined pattern information stored in the processing unit or converting the two-dimensional image information received in the processing unit to the three-dimensional image information. Dimensional scanner.
The apparatus of claim 6, wherein each of the processor and the computer further includes a wireless transmitter, wherein predetermined pattern information stored in the computer is wirelessly transmitted to the processor, and two-dimensional image information received from the processor is wirelessly transmitted to the computer. Dental three-dimensional scanner, characterized in that.
Transmitting, by the computer, predetermined pattern image information to a digital projector including a light source (S10);

The digital projector emitting the pattern light including the pattern image implemented from the predetermined pattern image information to the subject in the oral cavity through the optical system (S20);

Acquiring 2D image information by photographing the light reflected by the emitted pattern light from the subject in the oral cavity and passing through the optical system (S30);

Receiving, by the processor, the acquired 2D image information and transmitting the same to the computer (S40); And

Converting the 2D image information transmitted to the computer into a 3D image (S50);

Including,

The steps S10 to S50 are performed by a dental three-dimensional scanner and a computer, the dental three-dimensional scanner comprises: a digital projector for forming a predetermined pattern on the light emitted from the light source and irradiating the patterned light onto the intraoral subject; A camera for sensing a two-dimensional image formed by reflected light reflected by the patterned light to the subject in the oral cavity; An optical system for controlling patterned light emitted from the digital projector to the intraoral subject and reflected light reflected by the patterned light to the intraoral subject; A processor for transmitting predetermined pattern information to the digital projector, controlling the digital projector and the camera, and receiving 2D image information sensed by the camera; And a housing accommodating the digital projector, the camera, the optical system, and the processing unit.
The method of claim 8, wherein the step S10 further includes a storage unit for storing the predetermined pattern image information by the digital projector, and further comprising storing the programmed predetermined pattern image information transmitted from the computer by the storage unit of the digital projector. Scanning method using a three-dimensional dental scanner, characterized in that.
The method of claim 8, wherein the step S40, the processing unit and the computer each further comprises a wireless transmission device, the predetermined pattern information stored in the computer is wirelessly transmitted to the processing unit, the two-dimensional image information received by the processing unit to the computer Scanning method using a dental three-dimensional scanner, characterized in that the wireless transmission.