EP2812649A1 - Vorrichtung zum erfassen der dreidimensionalen geometrie von objekten und verfahren zum betreiben derselben - Google Patents

Vorrichtung zum erfassen der dreidimensionalen geometrie von objekten und verfahren zum betreiben derselben

Info

Publication number
EP2812649A1
EP2812649A1 EP13708646.8A EP13708646A EP2812649A1 EP 2812649 A1 EP2812649 A1 EP 2812649A1 EP 13708646 A EP13708646 A EP 13708646A EP 2812649 A1 EP2812649 A1 EP 2812649A1
Authority
EP
European Patent Office
Prior art keywords
handpiece
camera
power supply
operated
projector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13708646.8A
Other languages
German (de)
English (en)
French (fr)
Inventor
Christoph Nowak
Horst Koinig
Jürgen Jesenko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
A Tron3d GmbH
Original Assignee
A Tron3d GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by A Tron3d GmbH filed Critical A Tron3d GmbH
Priority to EP18199891.5A priority Critical patent/EP3467432B1/de
Publication of EP2812649A1 publication Critical patent/EP2812649A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • A61C9/006—Optical means or methods, e.g. scanning the teeth by a laser or light beam projecting one or more stripes or patterns on the teeth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
    • A61B5/1076—Measuring physical dimensions, e.g. size of the entire body or parts thereof for measuring dimensions inside body cavities, e.g. using catheters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
    • A61B5/1077—Measuring of profiles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
    • A61B5/1079—Measuring physical dimensions, e.g. size of the entire body or parts thereof using optical or photographic means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4538—Evaluating a particular part of the muscoloskeletal system or a particular medical condition
    • A61B5/4542—Evaluating the mouth, e.g. the jaw
    • A61B5/4547—Evaluating teeth
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/022—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of tv-camera scanning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2513—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object with several lines being projected in more than one direction, e.g. grids, patterns
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
    • G01B21/042—Calibration or calibration artifacts
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G06T7/0012—Biomedical image inspection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/189—Recording image signals; Reproducing recorded image signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/194—Transmission of image signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/204—Image signal generators using stereoscopic image cameras
    • H04N13/207—Image signal generators using stereoscopic image cameras using a single 2D image sensor
    • H04N13/221—Image signal generators using stereoscopic image cameras using a single 2D image sensor using the relative movement between cameras and objects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/204—Image signal generators using stereoscopic image cameras
    • H04N13/254—Image signal generators using stereoscopic image cameras in combination with electromagnetic radiation sources for illuminating objects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/02—Operational features
    • A61B2560/0204—Operational features of power management
    • A61B2560/0209—Operational features of power management adapted for power saving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2213/00—Details of stereoscopic systems
    • H04N2213/001—Constructional or mechanical details

Definitions

  • the invention relates to a device for detecting the
  • a handpiece having an optical device with at least one camera and at least one light source.
  • the invention further relates to a method for operating a device for detecting the three-dimensional geometry of objects, in particular teeth, with a handpiece, the at least one position sensor for detecting the change in the spatial position of the handpiece and an optical device with at least one camera for recording Images and having at least one light source for a projector.
  • a device of the type mentioned is known for example from AT 508 563 B.
  • the scope of the invention extends to the inclusion of digital dental and Kieferabrange, the help in the diagnosis, the
  • a position sensor is for example from the
  • the object of the invention is to improve such devices so that they are to operate with the lowest possible power supply.
  • the aim is a value of 500mA or 900mA, for example.
  • This object is achieved in a method of the type mentioned in that is determined by the position sensor in the handpiece, how large a change in the spatial position of the device, and it is determined from how many shots are made by the camera in a defined time unit.
  • Fiber optic cable or many deflecting mirrors avoided. It will be between the light source, so anything that can emit light, for example, the end of a fiber optic cable, and the means for generating the light, such as a laser or the
  • a means for generating the light with a lower power can be used to illuminate the object sufficiently, which is a
  • the rigid mounting of all elements of the optical device means that it is not possible to focus the optics of the camera. All calibrations of the optical device thus take place in advance. It is particularly important to achieve an optimal adjustment of the aperture. A smaller aperture is good for a larger depth of field, with larger aperture less illumination is needed for a sufficiently good recording.
  • Depth information can be obtained.
  • the blurred areas can therefore be used as another source of information.
  • blurred dots, areas, lines or the like can be drawn sharply and thus incorporated into the regular, for example stereometric, process of obtaining three-dimensional data.
  • the scanner is arranged in the course of calibration, for example, over a plane plane at various known distances. Distances that change in increments of 50 ⁇ m have proven to be particularly suitable for this purpose. However, other distances can be used for calibration. In general, the expert in the choice of distances or their changes to the resolution of the means used to capture the two-dimensional images oriented. The better changes in the captured two-dimensional image can be detected, the less changes in the distances between scanner and plane are useful in the course of calibration.
  • Calibration recordings are made of a preferably flat surface.
  • the distances hereby change in steps of preferably 50 ⁇ m.
  • the center axes of the field angles of the cameras are preferably in the calibration recordings
  • Brightness history stored from brightest to darkest areas of points, areas, lines or the like therefore, it is no longer necessary to assume a statistical brightness curve in order to sharpen the images, but one can read off probable edges from an empirical table created during the calibration.
  • the edges selected at the sharpening mark therefore have a much greater accuracy than edges selected by conventional methods.
  • Table is chosen, even before the actual evaluation of the two-dimensional images are estimated how far the subject area was away from the camera, as for
  • the power supply is interrupted on the recording side. So be
  • the handpiece has at least one position sensor, in particular one
  • Acceleration sensor, a magnetic field sensor and / or a tilt sensor determines how large the change in the spatial position of the device is, and determines from this how many pictures are to be taken by the camera in a defined time unit. This avoids the need for more images to be taken from one and the same place with less movement than is necessary for optimal detection of the geometry.
  • the frame rate of the recorded images can be changed, preferably the image rate is between 1 and 30 images per second. Additionally or alternatively, according to a preferred embodiment of the method, the frame rate may also be adjusted depending on whether a larger or smaller power supply is available. This means that more light pulses can be emitted and recorded with a larger power supply than with a lower power supply.
  • optical element in a preferred embodiment form, the optical
  • Setup at least one projector for the projection of patterns.
  • the projection of patterns enhances the possibilities for Capture of the three-dimensional geometry.
  • the field angle of the camera and the field angle of the projector cover each other to at least 50%, preferably at least 80%, more preferably at least 90%.
  • the field angle is the cone-shaped area in which the projection or the recording takes place.
  • the device has an optionally rechargeable electrical energy store. This can fulfill several functions according to the invention.
  • the device can serve as the sole energy source of the device.
  • the device makes sense if the device further has a data memory or a possibility of wireless data transmission. So the device can be moved completely freely without cables.
  • the data is stored, it is expedient to connect the subsequent transmission of the data, for example via a USB connection, with a charging of the energy store.
  • the energy storage a Alternatively, according to the invention, the energy storage a
  • Be auxiliary power source of the device This can be switched on if necessary.
  • it is first determined how much current of the device is available.
  • it is provided in particular that it is determined whether 500mA or 900mA are available to the device, ie whether the device is connected to a USB 2.0 or a USB 3.0 port. If you want to operate the device in a mode that requires 900mA power supply, but has only a power supply of 500mA available, the energy storage system is drawn according to the method as an additional source of energy.
  • a Power supply can be realized for example 500mA or 900mA.
  • two cameras are preferred in one
  • the data captured by the camera become without further
  • Processing or processing forwarded to a processing unit or a storage medium.
  • a processing unit or a storage medium For a processor or chip that usually performs this processing or processing.
  • the further processing in the arithmetic unit can be carried out at least partially in the CPU, but it has been shown that it is particularly with regard to the speed of the
  • Data processing makes sense to process part of the data collected for the acquisition or calculation of the three-dimensional geometry in the GPU. So it is possible the data,
  • Three-dimensional representation on a display or a file available on a storage medium for example, a 3D file in STL format
  • the device may comprise a thermovoltaic element according to a preferred embodiment. With this can be obtained in accordance with a preferred embodiment of the method from the heat which arises during operation, electrical energy. This can then directly to the operation of the
  • Device can be used, on the other hand but, in particular when cooling the device and an energy storage with the energy obtained are fed.
  • Fig. 1 shows a schematic representation of a
  • Fig. 2 shows a schematic view of the underside of a
  • Fig. 1 shows an exemplary embodiment of the
  • a handpiece 1 in which an optical device 2 is located, which contains a light source 3, a projector 4, a first camera 5, a second camera 6 and a mirror 7.
  • a light source 3 In front of the mirror is located in the housing 15 of the handpiece 1, a recess. This is for hygienic reasons and to protect the handpiece in the first
  • the light source 3 is an LED.
  • a means of producing light (not in the drawing).
  • the projector 4 is used to project patterns onto the object. Depending on how the geometry is detected, it can be either regular patterns, such as stripes, or irregular patterns, such as irregular shapes
  • Point pattern, act After the projector 4, the light beam 8 strikes the mirror 7 and is deflected via this onto the object 9 whose geometry is to be detected.
  • the object 9 is a tooth.
  • Object are aligned can also be on the mirror 7
  • the cameras 5, 6 pick up the pattern projected onto the tooth 9, from which the geometry of the tooth 9 is later calculated.
  • the device may be physically connected both to a cable 14 and wirelessly.
  • a wireless connection for example, Bluetooth or WLAN
  • an optionally rechargeable energy store 11 is provided in the handpiece 1. Im dargestellen
  • the drawing also shows a position sensor 12. With this can be determined, how large the spatial movement of the handpiece 1 is.
  • the position sensor 12 for example, an acceleration sensor, a geomagnetic sensor or a
  • Fig. 2 shows a schematic view of the underside of an embodiment of the invention. In this case, two areas 17 are shown, in which a thermovoltai cal element could be placed.
  • thermovoltaic element is arranged directly on the underside, ie the side on which the cover 13 is located, in the vicinity of the optical device 2. This is advantageous because the optical device 2, in particular the projector 4, produces the most heat during operation and this can be used with the least possible losses.
  • this has the advantage that it can be sized larger, but then a heat conductor, which conducts the heat from the optical device 2 to the thermovoltaic element, necessary. Even with a positioning of the
  • thermovoltaic element in the second region 17 is a thermovoltaic element
  • thermovoltaic element Mounting on the underside of the handpiece 1 makes sense, so that according to a preferred embodiment of the invention facing outward, heat-emitting side of the thermovoltaic element is not covered by the hand of the user.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Dentistry (AREA)
  • Medical Informatics (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Pathology (AREA)
  • Biophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Epidemiology (AREA)
  • Optics & Photonics (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Rheumatology (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Electromagnetism (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Quality & Reliability (AREA)
  • Theoretical Computer Science (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
EP13708646.8A 2012-02-06 2013-02-04 Vorrichtung zum erfassen der dreidimensionalen geometrie von objekten und verfahren zum betreiben derselben Withdrawn EP2812649A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18199891.5A EP3467432B1 (de) 2012-02-06 2013-02-04 Verfahren zum betreiben einer vorrichtung zum erfassen der dreidimensionalen geometrie von objekten

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012100953.8A DE102012100953B4 (de) 2012-02-06 2012-02-06 Vorrichtung zum Erfassen der dreidimensionalen Geometrie von Objekten und Verfahren zum Betreiben derselben
PCT/AT2013/000017 WO2013116880A1 (de) 2012-02-06 2013-02-04 Vorrichtung zum erfassen der dreidimensionalen geometrie von objekten und verfahren zum betreiben derselben

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP18199891.5A Division EP3467432B1 (de) 2012-02-06 2013-02-04 Verfahren zum betreiben einer vorrichtung zum erfassen der dreidimensionalen geometrie von objekten

Publications (1)

Publication Number Publication Date
EP2812649A1 true EP2812649A1 (de) 2014-12-17

Family

ID=47845657

Family Applications (3)

Application Number Title Priority Date Filing Date
EP13708646.8A Withdrawn EP2812649A1 (de) 2012-02-06 2013-02-04 Vorrichtung zum erfassen der dreidimensionalen geometrie von objekten und verfahren zum betreiben derselben
EP13708647.6A Active EP2812650B1 (de) 2012-02-06 2013-02-04 Verfahren zum betreiben einer vorrichtung zum erfassen der dreidimensionalen geometrie von objekten
EP18199891.5A Active EP3467432B1 (de) 2012-02-06 2013-02-04 Verfahren zum betreiben einer vorrichtung zum erfassen der dreidimensionalen geometrie von objekten

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP13708647.6A Active EP2812650B1 (de) 2012-02-06 2013-02-04 Verfahren zum betreiben einer vorrichtung zum erfassen der dreidimensionalen geometrie von objekten
EP18199891.5A Active EP3467432B1 (de) 2012-02-06 2013-02-04 Verfahren zum betreiben einer vorrichtung zum erfassen der dreidimensionalen geometrie von objekten

Country Status (7)

Country Link
US (3) US20150002649A1 (enrdf_load_html_response)
EP (3) EP2812649A1 (enrdf_load_html_response)
KR (1) KR20140128336A (enrdf_load_html_response)
BR (1) BR112014018895A8 (enrdf_load_html_response)
CA (1) CA2863798A1 (enrdf_load_html_response)
DE (1) DE102012100953B4 (enrdf_load_html_response)
WO (2) WO2013116880A1 (enrdf_load_html_response)

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EP2812650B1 (de) 2019-07-24
CA2863798A1 (en) 2013-08-15
KR20140128336A (ko) 2014-11-05
EP3467432A1 (de) 2019-04-10
US10166090B2 (en) 2019-01-01
EP2812650A1 (de) 2014-12-17
WO2013116881A1 (de) 2013-08-15
DE102012100953B4 (de) 2020-01-09
US20150282902A1 (en) 2015-10-08
WO2013116880A1 (de) 2013-08-15
US9861456B2 (en) 2018-01-09

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