Image display system configured to update correspondences using arbitrary features

• US 20080101725A1
• Filed: 10/26/2006
• Published: 05/01/2008
• Est. Priority Date: 10/26/2006
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Lin, I-Jong, Chang, Nelson, Damera-Venkata, Niranjan
• Application Number:
  US11/586,758
• Publication Number:
  US 20080101725A1
• Time in Patent Office: Days
• US Class Current: 382/286
• CPC Class Codes: G06T 7/80 Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
• CPC Class Codes: G06V 10/245 by locating a pattern; Special marks for positioning
• CPC Class Codes: H04N 9/3147 Multi-projection systems displays in general H04N9/12; video walls G06F3/1446, G09G2300/026
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A method performed by an image display system is provided. The method includes identifying a first arbitrary feature that is inherent in a first image frame and suitable for use as a first fiducial mark when the first image frame is displayed on a display surface by a display device and updating correspondence information between the display device and an image capture device using the first arbitrary feature in the first image frame and an image that is captured to include the first arbitrary feature on the display surface.

Claims

1. A method performed by an image display system, the method comprising:

identifying a first arbitrary feature that is inherent in a first image frame and suitable for use as a first fiducial mark when the first image frame is displayed on a display surface by a display device; and

updating correspondence information between the display device and an image capture device using the first arbitrary feature in the first image frame and an image that is captured to include the first arbitrary feature on the display surface.

2. The method of claim 1 further comprising:

determining a correspondence between the first arbitrary feature in the first image frame and the first arbitrary feature in the image; and

updating the correspondence information using the correspondence.

3. The method of claim 1 further comprising:

displaying the first image frame including the first arbitrary feature on the display surface; and

capturing the image to include the first arbitrary feature on the display surface.

4. The method of claim 1 further comprising:

identifying a second arbitrary feature that is inherent in the first image frame and suitable for use as a second fiducial mark when the second arbitrary feature is displayed on the display surface by the display device; and

updating the correspondence information between the display device and the image capture device using the second arbitrary feature in the first image frame and the image that is captured to include the second arbitrary feature on the display surface.

5. The method of claim 4 wherein the first arbitrary feature differs from the second arbitrary feature.

6. The method of claim 1 further comprising:

displaying a first sub-frame configured to form the first arbitrary feature on the display surface with the display device, the display device including a first projector; and

displaying a second sub-frame configured not to form the first arbitrary feature on the display surface with a second projector such that the second sub-frame at least partially overlaps with the first sub-frame on the display surface.

7. The method of claim 6 further comprising:

generating the first sub-frame to include the first arbitrary feature in a first region of the first sub-frame; and

generating the second sub-frame not to include the first arbitrary feature in a second region of the second sub-frame that is configured to overlap with the first region.

8. The method of claim 1 further comprising:

generating a second image frame for display on the display surface using the set of correspondences subsequent to updating the set of correspondences.

9. The method of claim 1 wherein the first arbitrary feature is a corner feature.

10. An image display system comprising:

a processing system configured to generate first and second sub-frames corresponding to a first image frame such that the first sub-frame includes a first region configured to cause a first feature of the first image frame to be displayed and the second sub-frame includes a second region that at least partially overlaps with the first region on the display surface and is not configured to cause the first feature to be displayed;

first and second projectors configured to simultaneously project the first and the second sub-frames onto a display surface in at least partially overlapping positions; and

an image capture device configured to capture an image to include the first feature as displayed on the display surface;

wherein the processing system is configured to update first correspondence information between the first projector and the image capture device using the first feature in the image.

11. The image display system of claim 10 wherein the processing system is configured to generate the second sub-frame to include a third region configured to cause a second feature to be displayed, and wherein the processing system is configured to generate the first sub-frame to include a fourth region that at least partially overlaps with the third region on the display surface and is not configured to cause the second feature of the first image frame to be displayed.

12. The image display system of claim 11 wherein the image capture device is configured to capture the second image to include the second feature as displayed on the display surface, and wherein the processing system is configured to update second correspondence information between the second projector and the image capture device using the second feature in the image.

13. The image display system of claim 11 wherein the processing system is configured to generate a third sub-frame to include a fifth region that at least partially overlaps with the first region on the display surface and is not configured to cause the first feature of the first image frame to be displayed and a sixth region that at least partially overlaps with the third region on the display surface and is not configured to cause the second feature of the first image frame to be displayed.

14. The image display system of claim 10 wherein the processing system is configured to generate the first and the second sub-frames using the first set of correspondences prior to updating the first correspondence information.

15. The image display system of claim 10 wherein the processing system is configured to generate third and fourth sub-frames corresponding to a second image frame using the first correspondence information subsequent to updating the first set of correspondences.

16. The image display system of claim 10 wherein the processing system is configured to identify the first feature as suitable for use as a fiducial mark.

17. A program product comprising:

a program executable by a processing system for causing the processing system to;

identify an arbitrary feature that is inherent in a image frame that is suitable for use as a fiducial mark when the image frame is displayed on a display surface; and

generate a first correspondence between the arbitrary feature in the image frame and the arbitrary feature in an image captured from the display surface;

a medium for storing the program.

18. The program product of claim 17 wherein the first correspondence identifies a configuration of a projector configured to display the image frame on the display surface and a camera configured to capture the image.

19. The program product of claim 17 wherein the program is executable by the processing system for causing the processing system to:

locate the arbitrary feature in the image using a second correspondence that identifies a configuration of a projector configured to display the image frame on the display surface and a camera configured to capture the image prior to generating the first correspondence.

20. The program product of claim 17 wherein the program is executable by the processing system for causing the processing system to:

update camera-to-projector correspondence information with the first correspondence using one of a conjugate gradient algorithm or a Newton'"'"'s approximation algorithm.