# US 12,004,921 B2 · Scan guide providing method and image processing device therefor

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- Number: US 12,004,921 B2
- Document ID: US12004921B2
- Status: Granted
- Kind: B2
- Application number: 17/436,889
- Filed: 2020-03-03
- Published: 2022-05-26
- Granted: 2024-06-11
- Earliest claimed: 2019-03-29
- Assignees: Osstemimplant Co., Ltd.
- Applicants: Osstemimplant Co., Ltd.
- Inventors: Sulho Kim
- Web page: https://patentgrep.com/patent/US12004921B2

## CPC

- A61C 9/0053: {Optical means or methods, e.g. scanning the teeth by a laser or light beam}
- A61B 5/0064: {Body surface scanning}
- A61B 5/0077: {Devices for viewing the surface of the body, e.g. camera, magnifying lens}
- A61B 5/0088: {for oral or dental tissue}
- A61B 5/4547: {Evaluating teeth}
- A61B 5/743: {Displaying an image simultaneously with additional graphical information, e.g. symbols, charts, function plots}
- A61C 9/0046: {Data acquisition means or methods}
- G06T 1/0007: {Image acquisition}
- G06T 7/0012: {Biomedical image inspection}
- G06T 7/50: Depth or shape recovery
- G06T 2207/10028: Range image; Depth image; 3D point clouds
- G06T 2207/30036: Dental; Teeth
- 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)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

Disclosed are a scan guide providing method and an image processing device therefor. A scan guide providing method according to an embodiment comprises the steps of: displaying, on a scan screen, a guide scan path for providing a scanning strategy of an intraoral scanner; tracking a user scan path actually scanned, along the guide scan path, by the intraoral scanner; and displaying the tracked user scan path together with the guide scan path.

## Claims

### Claim 1

A scan guide providing method comprising:
displaying, on a scan screen, a guide scan path providing a scanning strategy of an intraoral scanner;
tracking a user scan path scanned through the intraoral scanner along the guide scan path; and
displaying the tracked user scan path together with the guide scan path,
wherein the tracking of the user scan path comprises:
creating a depth image by reconstructing a two-dimensional (2D) image acquired through scanning by the intraoral scanner;
connecting central points or main points of objects constituting the depth image; and
generating the user scan path by detecting intersection points from the central points or main points on the objects to a position on a surface of a three-dimensional (3D) object and connecting the detected intersection points.

### Claim 2 (depends on 1)

The scan guide providing method of claim 1, wherein the displaying of the guide scan path on the scan screen comprises displaying, on a screen, guide scan paths set in advance for respective manufacturers of intraoral scanners.

### Claim 3 (depends on 1)

The scan guide providing method of claim 1, wherein the displaying of the guide scan path on the scan screen comprises rotating the guide scan path according to a user's manipulation or moving the guide scan path to the same viewpoint as a position actually photographed by the intraoral scanner and displaying the guide scan path on a screen.

### Claim 4 (depends on 1)

The scan guide providing method of claim 1, wherein the displaying of the guide scan path on the scan screen comprises rotating the guide scan path in real time and displaying the guide scan path on a screen in synchronization with a position actually photographed by the intraoral scanner.

### Claim 5 (depends on 1)

The scan guide providing method of claim 1, wherein the tracking of the user scan path further comprises correcting the user scan path by connecting points spaced a predetermined distance from the detected intersection points.

### Claim 6 (depends on 1)

The scan guide providing method of claim 1, wherein the tracking of the user scan path comprises generating the user scan path by connecting the central points on objects constituting a three-dimensional (3D) image acquired through scanning by the intraoral scanner.

### Claim 7 (depends on 1)

The scan guide providing method of claim 1, wherein the displaying of the tracked user scan path together with the guide scan path comprises equalizing a scale of the tracked user scan path with a scale of the guide scan path and displaying the user scan path to match the guide scan path.

### Claim 8 (depends on 1)

The scan guide providing method of claim 1, further comprising displaying the user scan path on image data acquired through scanning by the intraoral scanner.

### Claim 9 (depends on 1)

The scan guide providing method of claim 1, further comprising:
providing a user interface through which whether to display a scan guide or not is set by a user; and
providing a user interface through which a transparency of the scan guide is set by the user.

### Claim 10 (depends on 1)

The scan guide providing method of claim 1, further comprising:
comparing and analyzing the user scan path and the guide scan path to each other; and
providing at least one of a comparison and analysis result and a warning signal generated as the result.

### Claim 11

An image processing device comprising:
a data acquisition unit configured to acquire, from an intraoral scanner, image data acquired by scanning an inside of a user's mouth or an intraoral model;
an output unit configured to display the image data acquired from the intraoral scanner and a guide scan path providing a scanning strategy of the intraoral scanner; and
a control unit configured to receive and image-process the image data acquired by the data acquisition unit and providing the guide scan path to the output unit,
wherein the control unit configures a screen by tracking a user scan path scanned through the intraoral scanner along the guide scan path and matching the tracked user scan path to the guide scan path, and
the output unit displays the user scan path on the screen together with the guide scan path, and
wherein the control unit creates a depth image by reconstructing a two-dimensional (2D) image acquired through scanning by the intraoral scanner, connects central points or main points on objects constituting the depth image, and generates the user scan path by detecting intersection points from the central points or main points on the objects to a position on a surface of a three-dimensional (3D) object and connecting the detected intersection points.

### Claim 12 (depends on 11)

The image processing device of claim 11, wherein the output unit rotates the guide scan path according to a user's manipulation or moves the guide scan path to the same viewpoint as a position actually photographed through the intraoral scanner and displays the guide scan path on the screen.

### Claim 13 (depends on 11)

The image processing device of claim 11, wherein the output unit rotates the guide scan path in real time and displays the guide scan path on the screen in synchronization with a position actually photographed by the intraoral scanner.

### Claim 14 (depends on 11)

The image processing device of claim 11, wherein the output unit displays, on the screen, a user interface through which whether to display a scan guide or not is set by a user and a user interface through which a transparency of the scan guide is set by the user.

### Claim 15 (depends on 11)

The image processing device of claim 11, wherein the control unit corrects the user scan path by connecting points spaced a predetermined distance from the detected intersection points.

### Claim 16 (depends on 11)

The image processing device of claim 11, wherein the control unit generates the user scan path by connecting the central points on objects constituting a three-dimensional (3D) image acquired through scanning by the intraoral scanner.

### Claim 17 (depends on 11)

The image processing device of claim 11, wherein the control unit equalizes a scale of the tracked user scan path with a scale of the guide scan path and matches the user scan path to the guide scan path.

### Claim 18 (depends on 11)

The image processing device of claim 11, wherein the output unit displays the user scan path on image data acquired through scanning by the intraoral scanner.

### Claim 19 (depends on 11)

The image processing device of claim 11, wherein the control unit compares and analyzes the user scan path and the guide scan path to each other and provides at least one of a comparison and analysis result and a warning signal generated as a result.