WO2018124724A1 - Dispositif de balayage et procédé de balayage associé - Google Patents

Dispositif de balayage et procédé de balayage associé Download PDF

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Publication number
WO2018124724A1
WO2018124724A1 PCT/KR2017/015534 KR2017015534W WO2018124724A1 WO 2018124724 A1 WO2018124724 A1 WO 2018124724A1 KR 2017015534 W KR2017015534 W KR 2017015534W WO 2018124724 A1 WO2018124724 A1 WO 2018124724A1
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WO
WIPO (PCT)
Prior art keywords
image
measurement object
tooth
camera
setting value
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PCT/KR2017/015534
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English (en)
Korean (ko)
Inventor
홍혁기
정석원
최연식
조영창
손재기
Original Assignee
전자부품연구원
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Publication of WO2018124724A1 publication Critical patent/WO2018124724A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A61C9/004—Means or methods for taking digitized impressions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C19/00—Dental auxiliary appliances
    • A61C19/04—Measuring instruments specially adapted for dentistry
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A61C9/004—Means or methods for taking digitized impressions
    • A61C9/0046—Data acquisition means or methods
    • A61C9/0053—Optical means or methods, e.g. scanning the teeth by a laser or light beam

Definitions

  • the present invention relates to a scanner apparatus and a scanning method thereof.
  • a dental clinic or the like performs treatment and care for a patient's damaged tooth through an impression taking process of producing a plaster model of the patient's teeth.
  • X-rays such as X-rays were projected onto the affected area of the oral cavity to obtain a two-dimensional screen, or computer tomography (CT).
  • CT computer tomography
  • An object according to an embodiment of the present invention is to eliminate the need for physical movement and driving means for focusing by applying a non-driven optical system when driving a scanner device, thereby improving the operation performance of the scanner with no noise and vibration during the actual scanning process. It is an object of the present invention to provide a scanner device and a scanning method capable of more effectively securing driving reliability.
  • the present invention also provides a scanner device and a scanning method capable of precise 3D scanning according to the shape and structure of a target object by more precisely controlling the setting of the tomography interval according to the target object during tomography for 3D scanning.
  • a scanner apparatus includes a light source for irradiating light onto a measuring object, an optical system for receiving the light reflected by the measuring object, and photographing the end surface of the measuring object by the reflected light received by the optical system.
  • a camera a depth control unit for controlling the focus control of the liquid lens included in the optical system through the AC pulse and the camera, and the depth control unit includes a main control unit for controlling a focusing interval setting value for the measurement object.
  • the main controller may further include a driving controller for driving the light source and a database storing pre-standard image information of the measurement object corresponding to the cross-sectional image information of the measurement object photographed by the camera.
  • the focusing interval setting value of the depth controller may be controlled by matching the cross-sectional image information provided by the camera and pre-standard image information of the measurement object.
  • the depth controller may apply the AC pulse onto the liquid lens, and may vary at least one of the amplitude, frequency, and duty of the AC pulse according to the measurement distance of the measurement object or the appearance gradient of the measurement object. have.
  • the apparatus may further include a 3D image output unit which receives the cross-sectional image data of the measurement object obtained by the camera from the main controller and converts the cross-sectional image data into a 3D image.
  • a 3D image output unit which receives the cross-sectional image data of the measurement object obtained by the camera from the main controller and converts the cross-sectional image data into a 3D image.
  • the main control unit if the measurement object is an oral tooth, the database stores the image of the standard tooth, and compares the image obtained by the camera with the image of the standard tooth to determine the tooth type
  • the depth control unit may be controlled by a focusing interval set value set according to a range of inclination of the outer cross section of the tooth according to the tooth type.
  • the optical system may further include a polarizing filter coupled to one end.
  • a scanning method of a scanner device including: (A) irradiating light to a measurement object with a light source, (B) receiving light reflected from the measurement object, and including an optical system including a liquid lens. Scanning according to a focusing interval setting value by a depth control unit for adjusting a focus of the liquid lens; (C) a camera through a main control unit for each end face of the measurement object scanned by the optical system according to the focusing interval setting value; Photographing with; And (D) transmitting the image photographed by the camera to the 3D image output unit through the main controller and converting the image photographed by the camera into a 3D image by the 3D image output unit.
  • step (D) when the converted 3D image is indeterminately determined, the step (B) is performed by the main controller to further refine the focusing interval setting value.
  • step (D) the step of converting each cross-sectional image of the measurement object scanned into a three-dimensional image through a 3D image output unit and outputting the same may be repeated according to the subdivided focusing interval setting value.
  • the depth controller may apply the AC pulse onto the liquid lens, and may vary at least one of the amplitude, frequency, and duty of the AC pulse according to the measurement distance of the measurement object or the appearance gradient of the measurement object. have.
  • the scanning method of the scanner apparatus (A) irradiating the light in the oral cavity with a light source, (B) receives the light reflected from the tooth, the optical system including a liquid lens Scanning according to a focusing interval setting value by a depth control unit for adjusting a focus of the liquid lens, (C) photographing each end surface of the tooth scanned according to the focusing interval setting value with a camera, (D) the Determining a tooth type by comparing each section of the photographed tooth with a database storing standard tooth image data. (E) when the tooth type is determined, the main controller controls the depth control unit to set a focusing interval set value according to the tooth type.
  • step (E) if the tooth type is not determined, step (B) controls and scans the depth controller so that the focusing interval setting value is further divided by the main controller, and (C). Step) photographing each end surface of the tooth scanned by the camera according to the subdivided focusing interval setting value; And (D) may further comprise repeating the step of determining a tooth type by comparing each section of the photographed tooth with a database storing standard tooth image data according to the subdivided focusing interval setting value. have.
  • the depth control unit applies the AC pulse on the liquid lens, the at least one of the amplitude, frequency and duty of the AC pulse can be varied according to the shape of the measurement distance to the tooth or the appearance gradient of the measurement object. have.
  • the 3D scanner apparatus by applying a non-driven optical system to adjust the focus does not have a separate drive means according to the drive in the device can be made thin and small easily, There is an effect that can effectively secure the durability and reliability of the operation of the scanner device for reducing vibration and noise.
  • FIG. 1 is a view showing a scanner according to an embodiment of the present invention
  • FIG. 2 is a more detailed view of the control circuit of the 3D oral cavity scanner shown in FIG. 1;
  • FIG. 3 illustrates a scanning system according to another embodiment of the present invention
  • FIG. 5 is a flowchart of a scanning method for an oral cavity, which is one specific embodiment of the present invention.
  • Figure 6 illustrates the results of performing oral scanning in accordance with an embodiment of the present invention
  • FIG. 1 is a view showing a scanner according to an embodiment of the present invention
  • Figure 2 is a view showing in more detail the control circuit of the 3D oral scanner shown in Figure 1
  • Figure 3 is another embodiment of the present invention
  • the depth control unit 192 and the camera 120 to control the focus control of the camera 120 and the liquid lens included in the optical system to control the camera 120, the measurement object to the depth control unit 192 It includes; main control unit 191 for controlling the focusing interval set value for the.
  • the scanner apparatus includes a light source 110, a camera 120, a polarization filter, a lens housing, a liquid lens 150 (Liquid Lens), an optical lens 160, a probe, and a reflector. , To the main controller 191 and the depth controller 192.
  • the light source 110 irradiates light to the measurement object, and receives the light reflected by the measurement object from the optical system so that the camera 120 photographs the cross-sectional shape of the measurement object.
  • a three-dimensional final image can be output as described later.
  • the light source 110 is a device that generates light by using an LED or a laser.
  • the light source 110 may radiate light to a measurement object through a mirror, and the light source 110 directly radiates light directly to the mirror 180 through a probe 170. can do.
  • the optical system is a place where light by the light source 110 irradiated to the measurement object is reflected and incident, and may include a liquid lens that is a variable focus lens for focusing the measurement object.
  • the liquid lens focuses on the measurement object to be scanned more accurately with no noise and no vibration by adjusting the focus by no driving so that the reflected light reflected from the measurement object is incident and the camera 120 can take a cross-sectional image of the measurement object.
  • the optical system may further include the optical lens 160 and the polarization filter 130.
  • the polarization filter 130 can suppress diffuse reflection as much as possible by disposing at the end of the lens in order to minimize the scattered light according to the reflectance of the target object to be scanned.
  • the camera 120 accurately transmits the measurement of each section of the measuring object to be photographed through the focus adjustment of the liquid lens and transmits the related information to the main control unit 191 to output the 2D or 3D image of the final desired measuring object. Make it possible.
  • the depth controller 192 adjusts the focus of the liquid lens included in the optical system.
  • the focusing of the liquid lens is possible by applying a voltage, and particularly, the precision of the focusing is required for a small or more accurate scan of the object to be measured.
  • by applying an AC pulse to the liquid lens for more effective scanning of the measurement object it is possible to continuously or continuously control the fine focusing.
  • the depth control unit 192 may also be implemented through electrical control of the focal adjustment of the liquid lens intermittently changing. If the applied voltage is DC, it may be fixed to the lens housing 140 shown in FIG. 1 and thus may be insensitive to a slight change in the voltage, thereby applying an AC type pulse.
  • the AC pulse is a pulse capable of varying the amplitude (0V ⁇ 60V), the frequency (240Hz ⁇ 3.9KHz), the duty (0 ⁇ 100%).
  • the AC pulse by applying any one of the amplitude, frequency, and duty of the AC pulse, it is possible to appropriately adjust the focal length, the focusing precision and the duration of the focus maintenance for the measurement object.
  • the measurement object is a tooth in the oral cavity, there is a remarkable difference in the inclination of the side surfaces of various related teeth, and since it is a very narrow measurement in the oral cavity, it is necessary to appropriately adjust the accuracy of the focus adjustment and the waveform of the applied voltage. will be.
  • the depth controller 192 may adjust the focusing interval setting value of the target measurement object through the focusing interval setting value by the main controller 191 together with the focusing control of the liquid lens.
  • the focusing interval setting value will be described later.
  • the main controller 191 controls the camera 120 and may control a focusing interval setting value for the measurement object to be scanned through the depth manufacturing that controls the focus adjustment of the liquid lens.
  • the main controller 191 includes a drive controller for driving the light source 110, that is, a constant voltage / constant current controller, and is a pre-standard for the measurement object corresponding to the cross-sectional image information of the measurement object photographed by the camera 120. It may include a database for storing the image information.
  • the standard image information of the measurement object may be standard data of the measurement object to be scanned, that is, data of a standard shape of each tooth in the case of oral teeth.
  • it is possible to output more precise and reliable three-dimensional images by storing in advance a general and standard information image of a measurement object to be scanned, and matching this data with image information that is actually photographed in the scanning process. It is.
  • standard data about the tooth may be stored in a database.
  • the image information of the standard tooth can obtain an optimized precise scan image that matches the characteristics of the measurement object by effectively setting a large or small focusing method or focusing interval in consideration of the shape and appearance of the tooth.
  • the optical system can scan the measurement object according to the focusing interval setting value.
  • the focusing intervals are set small, and the incisor and the molar are smoothly changed, so setting the focusing intervals is larger than the canine, thereby increasing the accuracy and reliability of the scan.
  • Each cross-sectional image of the measurement object taken by the camera 120 is finally transmitted to the 3D image output unit through the main controller 191.
  • the plurality of related cross-sectional images may be converted into three-dimensional images to output a final scanned image.
  • the main controller 191 includes a camera 120 controller for controlling the camera 120 and a constant voltage / constant current controller for driving the light source 110.
  • the controllers are controlled by the MCU.
  • the cross-sectional images of the measurement object generated by the camera 120 are input through the camera 120 interface and then transferred to the 3D image output unit through the main controller 191.
  • the depth controller 192 may include a D / A converter, a bias circuit, a frequency generator, a DC / DC converter, and a full-bridge switching circuit.
  • the depth controller 192 applies an AC pulse other than DC to the liquid lens 150 to adjust the focal length of the liquid lens 150.
  • the focal length of the liquid lens 150 controlled by the depth controller 192 corresponds to the depth of the cross section of the measurement object.
  • the depth controller 192 transmits the depth information to the main controller 191, and the main controller 191 transmits the depth information together when transferring the measured object cross-sectional images generated by the camera 120 to the 3D image output unit. .
  • the 3D image output unit lists cross-sectional images of the measurement object according to depth information to generate an image of the 3D measurement object.
  • the 3D image output unit may be driven by a PC as well as other computing devices.
  • the 3D image output unit may control the depth controller 192 through the main controller 191. Accordingly, the 3D image output unit may operate the liquid lens 150 in the step mode or the sweep mode, and control the focal length of the liquid lens 150 (that is, the depth of the measurement object cross-sectional image) from 0 to 4096 steps. have.
  • a scanning system may include a scanner 100, a system body 200, a processor 300, and a 3D printer 400.
  • the processor body 300 is accommodated in the system body 200, a display is provided, and the scanner 100 and the 3D printer 400 are connected.
  • the processor 300 executes the above-described 3D image output unit and displays an image of a three-dimensional measurement object on a display.
  • the 3D printer 400 may produce a product or an object having a desired three-dimensional shape through a three-dimensional image of a desired measurement object.
  • FIG. 4 is a flowchart provided to explain a scanning method according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a scanning method for an oral cavity, which is one specific embodiment of the present invention.
  • step S10 of irradiating light onto a target object to be scanned through the light source 110 First, step S10 of irradiating light onto a target object to be scanned through the light source 110.
  • the depth controller 192 adjusts the focus of the liquid lens according to the focusing interval setting value.
  • the depth controller 192 may apply a voltage for adjusting the focus of the liquid lens.
  • the depth controller 192 may apply an AC pulse, and may measure at least one of an amplitude, a frequency, and a duty of the AC pulse to measure the measurement distance or the measurement object. It has already been described above that it can be varied depending on the shape of the appearance gradient of the object.
  • each end surface of the measurement object scanned by the optical system is photographed by the camera 120 through the main controller 191 according to the focusing interval setting value.
  • the main controller 191 may include a controller for driving the light source 110, control the camera 120, and control a focusing interval setting value by the depth controller 192 for adjusting the focus of the liquid lens.
  • the focusing interval setting value may have a fixed value basically fixed by the information about the first target measurement object, and may be adjusted in an appropriate range as will be described later.
  • the image photographed by the camera 120 is transmitted to the 3D image output unit through the main controller 191 and is converted into a 3D image by the 3D image output unit (S40).
  • the 3D image output unit By transmitting the cross-sectional image information according to the depth of the measurement object through the focus control of the liquid lens to the 3D image output unit by the main control unit 191, the three-dimensional scan image is finally output.
  • the depth control unit 192 in step (B) is performed.
  • the process returns to the step of scanning according to the focusing interval setting value and drives the process again.
  • the main controller 191 causes the depth controller 192 to newly set a smaller focusing interval setting value than before (S60).
  • the final 3D scanned image through the conversion of the 3D image can obtain a clearer and more precise image.
  • Determination of the scanned image by the 3D image output unit can be made by a practical user, or by setting a setting value for specific information of the image, and automatically focusing interval when the element falls below or significantly exceeds the reference value. By setting the setting value smaller or larger, scanning can be realized at an optimal focusing interval setting value suitable for the measurement object.
  • the output image by the 3D image output unit is a desired image
  • the final 3D scan image is naturally output and the related process is terminated.
  • (A) is a step (S110) of irradiating the light in the oral cavity with the light source (110).
  • the optical system including the liquid lens is scanned by the depth control unit 192 for adjusting the focus of the liquid lens in accordance with the focusing interval set value (S120) .
  • the optical system may include a polarizing filter 130 to minimize scattered light according to its reflectivity.
  • the focusing interval setting value is initially set in an appropriate range, and it is easy to convert and output related image data into a 3D image. As described below, the focusing interval setting value can be adjusted within an appropriate range.
  • the existing standard image information of the tooth is previously stored in a database, and the type of the tooth is determined by comparing and analyzing the cross-sectional image photographed by the camera 120. Determining the type of teeth is to appropriately set the range of depth of focusing according to the type of teeth.
  • the focusing interval set value already set by the standard image information may be appropriately applied according to the type of the tooth.
  • the main controller 191 corrects and scans the focusing interval setting value set according to the tooth type to an optimal focusing interval setting value through the depth control unit 192.
  • the main controller 191 includes a database storing not only the control of the camera 120 but also standard image information of the teeth, and compares the cross-sectional image information of the camera 120 with the standard image information to set an appropriate focusing interval setting value. Control may be performed through the depth controller 192.
  • the camera 120 photographs the cross section of the tooth that has been corrected and scanned through the optimal focusing interval setting value (S160).
  • S160 optimal focusing interval setting value
  • step (E) If, in step (E), the type of tooth cannot be determined, that is, when the cross-sectional image information is not correct by the camera 120 or the type of tooth cannot be specified,
  • the scanning value may be subdivided to adjust the setting value so that the wrongly scanned portion may be normally scanned. If not incorrectly scanned, the tomography section may be further subdivided so as to correct this even when the area between the respective images is formed too wide.
  • the scanning process is performed again with the segmented tomography section, thereby obtaining a more accurate 3D image of the tooth.
  • 6 illustrates the results of performing 3D oral scanning according to an embodiment of the present invention.
  • 6 is a three-dimensional combined image using Cloud Point data, which is just before obtaining 3D data.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Epidemiology (AREA)
  • Dentistry (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Endoscopes (AREA)

Abstract

Un dispositif de balayage selon un mode de réalisation de la présente invention comprend : une source de lumière pour émettre de la lumière vers un objet à mesurer ; un système optique pour recevoir la lumière réfléchie par l'objet à mesurer ; une caméra pour photographier une section transversale de l'objet à mesurer au moyen de la lumière réfléchie reçue par le système optique ; une unité de réglage de profondeur pour commander un réglage de mise au point pour une lentille liquide incluse dans le système optique au moyen d'une impulsion CA ; et une unité de commande principale pour commander la caméra et régler une valeur de réglage d'intervalle de mise au point sur l'objet à mesurer dans l'unité de réglage de profondeur. Selon un mode de réalisation de la présente invention, le dispositif de balayage tridimensionnel peut conférer efficacement une durabilité et une fiabilité opérationnelle au dispositif de balayage pour réduire la vibration et le bruit dus à un non-entraînement étant donné qu'un système optique sans entraînement est appliqué pour le réglage de mise au point.
PCT/KR2017/015534 2016-12-29 2017-12-27 Dispositif de balayage et procédé de balayage associé WO2018124724A1 (fr)

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KR1020160182911A KR101878081B1 (ko) 2016-12-29 2016-12-29 스캐너 장치 및 그 스캐닝 방법
KR10-2016-0182911 2016-12-29

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KR102049847B1 (ko) * 2018-11-21 2019-11-28 주식회사신도리코 3차원 스캐너

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Publication number Priority date Publication date Assignee Title
JP2009525503A (ja) * 2006-02-01 2009-07-09 バリオプテイツク 多相液体組成物およびそれを組み込んだエレクトロウェッティングにより駆動される可変焦点光学レンズ
KR20100087629A (ko) * 2009-01-28 2010-08-05 파나소닉 주식회사 구강 내 측정 장치 및 구강 내 측정 시스템
KR20140142999A (ko) * 2013-06-05 2014-12-15 윤상룡 구강용 영상촬영장치
KR20160038923A (ko) * 2014-09-30 2016-04-08 전자부품연구원 무구동 광학계를 구비하는 구강 스캐너 및 이를 이용한 구강 스캐닝 방법
KR101648970B1 (ko) * 2015-04-22 2016-08-19 한국광기술원 압전소자 기반의 패턴 모듈과 가변 초점 렌즈를 이용한 3차원의 구강 스캔 장치

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