# US 9,519,991 B2 · Method for displaying optically determined surface geometries

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- Number: US 9,519,991 B2
- Document ID: US9519991B2
- Status: Granted
- Kind: B2
- Application number: 14/372,282
- Filed: 2013-02-04
- Published: 2015-01-08
- Granted: 2016-12-13
- Earliest claimed: 2012-02-06
- Assignees: A. Tron3D GmbH
- Applicants: Jurgen Jesenko
- Inventors: Jurgen Jesenko
- Web page: https://patentgrep.com/patent/US9519991B2

## CPC

- G06T 15/00: Three-dimensional [3D] image rendering
- A61B 5/1077: {Measuring of profiles}
- A61B 5/1079: {using optical or photographic means}
- A61B 5/7221: {Determining signal validity, reliability or quality (preventing, reducing or removing noise induced by motion artefacts A61B5/7207; noise originating from a therapeutic or surgical apparatus A61B5/7217)}
- A61B 5/742: {using visual displays (displays for heart-related electrical signals, e.g. ECG, A61B5/339)}
- A61C 9/0053: {Optical means or methods, e.g. scanning the teeth by a laser or light beam}
- G01B 11/25: by projecting a pattern, e.g. {one or more lines,} moiré fringes on the object (G01B11/255 takes precedence {; image analysis for depth or shape recovery G06T7/50})
- G01B 11/2513: {with several lines being projected in more than one direction, e.g. grids, patterns}
- G01B 21/04: by measuring coordinates of points
- G01B 21/047: {Accessories, e.g. for positioning, for tool-setting, for measuring probes}
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

In a method for displaying at least one property of an optically determined surface geometry of at least one three-dimensional object, in particular a tooth, on a display, in particular a computer screen, a defined region of the surface geometry is monitored to ascertain whether a defined criterion has been fulfilled. An amount of optically determined data of the defined region is a criterion. A number of defined regions of the surface geometry are assigned a property when all the regions of the number meet the criterion. The property is displayed graphically in a defined manner, wherein different properties are graphically displayed in a differing manner.

## Claims

### Claim 1

A method for displaying at least one property of an optically determined surface geometry of a tooth on a computer screen, the method comprising the steps of:
repeatedly scanning the tooth using a stereometry camera, checking the surface geometry of the tooth, and determining whether one of plural defined criteria is satisfied for each voxel of the surface geometry of the tooth, each voxel being a volume pixel representing a smallest unit within a computational three-dimensional volume, said checking including updating of optically determined data of each voxel,
wherein at least a first of the defined criteria is a first sum of the updatings of the optically determined data of each specific voxel, and a second of the defined criteria is a second sum of the updatings of the optically determined data of each specific voxel;
assigning at least a first property to voxels satisfying the first criteria, and assigning a second property to voxels satisfying the second criteria, to thereby define all of the voxels are divided into respective sets with a first set of voxels that each satisfy the first criteria and a second set of voxels that each satisfy the second set of criteria; and
graphically displaying the surface geometry on the tooth on the computer screen, with at least the voxels of the first set assigned with the first property being graphically displayed differently from the voxels of the second set assigned with the second property.

### Claim 2 (depends on 1)

The method of claim 1, wherein the voxels of the first set assigned with the first property are graphically displayed in a first color and the voxels of the second set assigned with the second property are graphically displayed in a second color.