Method and system for placing three-dimensional models

• US 20020094134A1
• Filed: 01/12/2001
• Published: 07/18/2002
• Est. Priority Date: 01/12/2001
• Status: Abandoned Application

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Nafis, Christopher Allen, Miller, James Vradenburg, Linthicum, Steven Eric, Lorensen, William Edward
• Application Number:
  US09/681,119
• Publication Number:
  US 20020094134A1
• Time in Patent Office: Days
• US Class Current: 382/285
• CPC Class Codes: G01C 11/06 by comparison of two or more pictures of the same area
• CPC Class Codes: G06T 17/10 Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes
• CPC Class Codes: G06T 19/20 Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
• CPC Class Codes: G06T 2219/2021 Shape modification

Abstract

A method and system for creating three-dimensional models comprises the steps of generating a three-dimensional object model from a plurality of digital images of an object, creating three-dimensional coordinates from the plurality of images, identifying coordinates on a CAD model of a part which correspond to the three-dimensional coordinates, calculating a transformation matrix between the three-dimensional coordinates and the coordinates on the CAD model, and applying the transformation matrix to the CAD model to position, scale, and orient the CAD model in the object model, thus creating a composite model.

Claims

1. A method for creating at least one three-dimensional model comprising the steps of:

generating a three-dimensional object model from a plurality of images of an object, wherein the images also contain a part which is at least partially visible;

creating at least three three-dimensional coordinates from the plurality of images;

identifying coordinates on an accessed computer aided design (CAD) model of the part which correspond to each of the three-dimensional coordinates;

calculating a transformation matrix between the respective ones of the three-dimensional coordinates and the coordinates on the CAD model; and

applying the transformation matrix to the CAD model to place the CAD model in the object model thus creating a composite model.

2. The method of claim 1 further comprising the step of:

storing the CAD model with transformed values in a storage device, the transformed values resulting from the applying step.

3. The method of claim 1 further comprising the step of:

storing the composite model in a storage device.

4. The method of claim 1, wherein the plurality of images are created by at least one digital camera.

5. The method of claim 1, wherein the images are created by scanning photographs of the object.

6. The method of claim 1 further comprising the step of:

reducing the error in the transformation matrix by a applying an error reducing algorithm.

7. The method of claim 6, wherein the error reducing algorithm is a least squares algorithm.

8. The method of claim 1 further comprising the step of:

transforming the composite model into a preferred reference frame, wherein all coordinates on the composite model are calculated relative to a preferred reference point of the object.

9. The method of claim 1, wherein the step of generating the three-dimensional object model from the plurality of digital images of the object comprises:

matching points and features of the plurality of digital images to create the three-dimensional object model.

10. A system for creating three-dimensional models comprising:

a photogrammetry system for generating a three-dimensional object model from a plurality of images of an object acquired from an image acquisition device, wherein the images also contain a part which is at least partially visible, wherein the photogrammetry system is operatively connected to the image acquisition device;

a computer system, operatively connected to the photogrammetry system, the computer system comprising;

at least one processor;

a user interface;

a monitor;

logic configured to create three or more three-dimensional coordinates from the plurality of images;

logic configured to access a CAD model of the part;

logic configured to identify coordinates on the CAD model which correspond to the three-dimensional coordinates;

logic configured to calculate a transformation matrix between the three-dimensional coordinates and the coordinates on the CAD model; and

logic configured to apply the transformation matrix to the CAD model thus placing the CAD model in the object model and creating a composite model.

11. The system of claim 10 further comprising:

a storage device, wherein the storage device is operatively connected to the computer system.

12. The system of claim 11, wherein the storage device is integrated with the computer system.

13. The system of claim 10, wherein the image acquisition device is at least one digital camera.

14. The system of claim 10, wherein the image acquisition device is a scanner.

15. The system of claim 10, wherein the computer system further comprises:

logic configured to reduce the error in the transformation matrix.

16. The system of claim 15, wherein the logic configured to reduce the error in the transformation matrix further comprises:

a least squares algorithm.

17. The system of claim 10, wherein the computer system further comprises:

logic configured to transform the composite model into a preferred reference frame, wherein all coordinates on the composite model are calculated relative to a preferred reference point of the object.

18. The system of claim 10, wherein the photogrammetry system is integrated with the computer system.

19. A system for creating three-dimensional models comprising:

an image acquisition device;

a photogrammetry system for generating a three-dimensional object model from a plurality of images of an object acquired from the image acquisition device, wherein the images also contain a part which is at least partially visible, wherein the photogrammetry system is operatively connected to the image acquisition device;

a computer system, operatively connected to the photogrammetry system, the computer system comprising;

at least one processor;

a user interface;

a monitor;

means for creating three or more three-dimensional coordinates from the plurality of images;

means for accessing a CAD model of the part;

means for identifying coordinates on the CAD model which correspond to the three-dimensional coordinates;

means for calculating a transformation matrix between the three-dimensional coordinates and the coordinates on the CAD model; and

means for applying the transformation matrix to the CAD model thus placing the CAD model in the object model and creating a composite model.