EP0935737A1 - Procede pour accroitre la precision de la mesure tridimensionelle d'objets - Google Patents

Procede pour accroitre la precision de la mesure tridimensionelle d'objets

Info

Publication number
EP0935737A1
EP0935737A1 EP97938789A EP97938789A EP0935737A1 EP 0935737 A1 EP0935737 A1 EP 0935737A1 EP 97938789 A EP97938789 A EP 97938789A EP 97938789 A EP97938789 A EP 97938789A EP 0935737 A1 EP0935737 A1 EP 0935737A1
Authority
EP
European Patent Office
Prior art keywords
pattern
coded
projected
areas
line
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Withdrawn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
EP97938789A
Other languages
German (de)
English (en)
Inventor
Rüdger Rubbert
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.)
Orametrix GmbH
Original Assignee
SYRINX MED TECH GmbH
Syrinx Medical Technologies 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 SYRINX MED TECH GmbH, Syrinx Medical Technologies GmbH filed Critical SYRINX MED TECH GmbH
Publication of EP0935737A1 publication Critical patent/EP0935737A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01B11/2536—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 using several gratings with variable grating pitch, projected on the object with the same angle of incidence

Definitions

  • the invention relates to a method for increasing the significance of the three-dimensional measurement of objects by means of optical recordings, projected patterns and triangulation calculation, in which a coded pattern is projected onto the object in order to avoid manifolds when evaluating the image data
  • the prior art includes electronic image converters, for example, CCD arrays stored in output signals immediately after digitization. or can be evaluated
  • an object is projected onto an object with spatial dimensions, for example a uniform line pattern results in a distorted line pattern when the viewing direction is different from the projection direction, depending on the surface shape of the object. If the object is depicted from this viewing direction by means of suitable optics on a CCD array, digitized If the image signals are made available to a data processing unit, it is possible to identify the lines at various points in the image and, with knowledge of the optical beam path and taking into account the geometric design of the projected line pattern, to calculate 3D coordinates using triangulation
  • the object is achieved according to the invention in that the pattern areas projected for the purpose of three-dimensional measurement of objects with spatial extensions according to the triangulation method are coded in such a way that the assignment to the corresponding area of the projected pattern can be recognized on the basis of a partial image section Beam path, the geometric design of the projected pattern and knowledge of the position of the corresponding pattern section in the image recording can be determined by means of a simple triangulation calculation, absolute 3D coordinates
  • the formation of the coded pattern compared to a simple stripe pattern may reduce the number of 3D information that can be calculated
  • the information associated with the individual images is compressed and the 3D information is successively completed, be it to supplement the information missing due to undercuts in individual images, or to represent larger objects than is possible due to the limitations of the field of view of the recording unit in a single image is
  • coded are areas of the projected pattern that can be significantly differentiated with regard to their geometric design and / or extension and / or their other, for example, colored design.
  • the lines according to the invention can advantageously, for. B. can be encoded by varying the stroke width within the respective line.
  • binary other discrete and analog encodings can be used.
  • - secondly - the contrast data of the digitized image information in the memory of a data processing unit are flat, that is, they are organized in rows and columns and represent - thirdly - the column data, for example the image information in the direction of the plane, which is spanned between the recording and projection device, can be automated evaluation the data in a suitable algorithm for the purpose of calculating the absolute 3D coordinates in such a way that the contrast data along an image column are checked for agreement with the pattern sequence dark / light / dark.
  • the corresponding statistical and numerical methods such as cross correlation, Wiener- Filters etc. also known for the subpixel evaluation.
  • the course and the formation of the line in the adjacent columns can be examined via edge tracking.
  • the line itself can thus be examined with regard to its formation and thus its coding.
  • the result is - firstly - the column position at which the line with its pattern focus was recorded and - secondly - the corresponding one Line segment decoded, so the line segment can be uniquely assigned to the corresponding pattern location in the undistorted and projection-based pattern. From this information, the 3D coordinates for a corresponding point on the surface of the object under consideration can be determined using triangulation calculation
  • the exact three-dimensional digital description possible with the above method makes it possible to dispense with spatial impressions (such as plaster casts) for the documentation of findings in three-dimensional content or for the computer-assisted preparation of therapeutic agents (such as toothing, dentures, Implants).
  • spatial impressions such as plaster casts
  • therapeutic agents such as toothing, dentures, Implants
  • the lines can be different from the variation of short and long line segments with single or double line widths along a line analogous to the Morse code If lines now fall into a shadowed area, absolute 3D coordinates can still be calculated for each visible line segment that contains the complete coding, without information about other lines or
  • the segments with different black components can be arranged in a linear or concentric manner
  • a color coding of the pattern can be carried out particularly advantageously according to the invention. If lines are used as a pattern, according to the invention, for example, each line can advantageously be designed in a different color each line must be clearly identified, provided that the color content of the recorded
  • color is understood to mean a selection of spectral lines and spectral ranges of visible, infrared and / or ultraviolet light. In the sense of this definition, it is irrelevant whether the color by
  • black is used synonymously for essentially unilluminated and / or for essentially no retroreflective or transmitted-radiation component due to absorption
  • the line width along the respective line is alternately in single or double width in a regularly repeated sequence
  • Line width executed in such a way that in a defined line section the length ratio of the pieces with single and double line width is different from line to line.
  • the embodiment shown in FIG. 1 is characterized in that, due to the special design of the pattern, a high density of the calculable support points can be achieved
  • FIG. 2 shows an arrangement of concentric pattern elements, the individual elements being coded in such a way that - firstly - the inner circle in 90 ° segments is blackened differently, - secondly - the outer concentric ring is blackened differently in 90 ° segments and - thirdly - the
  • the outer concentric ring pattern is configured differently from the higher-level element arrangement.
  • the embodiment shown in FIG. 2 is characterized in addition to the coding of the sample parts in that a) a high level of significance of the coding can be achieved by the three mentioned possibilities of different training of the individual sample element, and in this respect
  • Pattern recognition algorithms are suitable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Image Processing (AREA)

Abstract

L'invention concerne un procédé pour accroître la précision de la mesure tridimensionnelle d'objets par des enregistrements optiques, des modèles projetés et un calcul de triangulation. Selon ce procédé, on projette sur l'objet un modèle codé pour éviter toute multiplicité lors de l'évaluation des données vidéos. Ce procédé est particulièrement adapté aux diagnostics, à la thérapie et à la documentation dans le domaine médical.
EP97938789A 1996-09-12 1997-08-19 Procede pour accroitre la precision de la mesure tridimensionelle d'objets Withdrawn EP0935737A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1996138727 DE19638727A1 (de) 1996-09-12 1996-09-12 Verfahren zur Erhöhung der Signifikanz der dreidimensionalen Vermessung von Objekten
DE19638727 1996-09-12
PCT/DE1997/001798 WO1998011404A1 (fr) 1996-09-12 1997-08-19 Procede pour accroitre la precision de la mesure tridimensionelle d'objets

Publications (1)

Publication Number Publication Date
EP0935737A1 true EP0935737A1 (fr) 1999-08-18

Family

ID=7806439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97938789A Withdrawn EP0935737A1 (fr) 1996-09-12 1997-08-19 Procede pour accroitre la precision de la mesure tridimensionelle d'objets

Country Status (6)

Country Link
EP (1) EP0935737A1 (fr)
JP (1) JP2001505302A (fr)
CN (1) CN1231724A (fr)
AU (1) AU4111597A (fr)
DE (1) DE19638727A1 (fr)
WO (1) WO1998011404A1 (fr)

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US6413084B1 (en) 2000-04-28 2002-07-02 Ora Metrix, Inc. Method and system of scanning
US6738508B1 (en) 2000-04-28 2004-05-18 Orametrix, Inc. Method and system for registering data
US7068836B1 (en) 2000-04-28 2006-06-27 Orametrix, Inc. System and method for mapping a surface
US6532299B1 (en) 2000-04-28 2003-03-11 Orametrix, Inc. System and method for mapping a surface
US6771809B1 (en) 2000-04-28 2004-08-03 Orametrix, Inc. Method and system for registering data
US6512994B1 (en) 1999-11-30 2003-01-28 Orametrix, Inc. Method and apparatus for producing a three-dimensional digital model of an orthodontic patient
US6554613B1 (en) 2000-04-19 2003-04-29 Ora Metrix, Inc. Method and apparatus for generating an orthodontic template that assists in placement of orthodontic apparatus
US6736638B1 (en) 2000-04-19 2004-05-18 Orametrix, Inc. Method and apparatus for orthodontic appliance optimization
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US6688885B1 (en) 1999-11-30 2004-02-10 Orametrix, Inc Method and apparatus for treating an orthodontic patient
US6318995B1 (en) 2000-04-19 2001-11-20 Drametrix, Inc. Method and apparatus for bonding a bracket to a tooth
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US7471821B2 (en) 2000-04-28 2008-12-30 Orametrix, Inc. Method and apparatus for registering a known digital object to scanned 3-D model
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Also Published As

Publication number Publication date
DE19638727A1 (de) 1998-03-19
JP2001505302A (ja) 2001-04-17
AU4111597A (en) 1998-04-02
WO1998011404A1 (fr) 1998-03-19
CN1231724A (zh) 1999-10-13

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