Generating sub-frames for projection based on map values generated from at least one training image

• US 20080024469A1
• Filed: 07/31/2006
• Published: 01/31/2008
• Est. Priority Date: 07/31/2006
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Luo, Huitao, Damera-Venkata, Niranjan, An Chang, Nelson Liang
• Application Number:
  US11/496,358
• Publication Number:
  US 20080024469A1
• Time in Patent Office: Days
• US Class Current: 345/204
• 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 of displaying an image with a display system includes generating a plurality of map values based on at least one training image. A first image frame is received. A plurality of sub-frames corresponding to the first image frame are generated based on a geometric relationship between a reference coordinate system and a plurality of projectors, and based on the plurality of map values. The plurality of sub-frames are projected onto a target surface with the plurality of projectors, thereby producing a resulting image on the target surface.

Claims

1. A method of displaying an image with a display system, the method comprising:

generating a plurality of map values based on at least one training image;

receiving a first image frame;

generating a plurality of sub-frames corresponding to the first image frame based on a geometric relationship between a reference coordinate system and a plurality of projectors, and based on the plurality of map values; and

projecting the plurality of sub-frames onto a target surface with the plurality of projectors, thereby producing a resulting image on the target surface.

2. The method of claim 1, wherein generating the plurality of map values comprises:

generating a plurality of training sub-frames based on the at least one training image;

identifying a plurality of sets of pixels in the at least one training image, each set of pixels corresponding to a pixel in one of the training sub-frames; and

computing a set of map values for each identified set of pixels.

3. The method of claim 2, wherein the plurality of sets of pixels in the at least one training image are identified by geometrically mapping points in the training sub-frames to corresponding points in the at least one training image.

4. The method of claim 3, wherein each of the plurality of sets of pixels in the at least one training image is a window of pixels around a mapped point in the at least one training image.

5. The method of claim 2, wherein the plurality of training sub-frames are generated in an iterative process based on maximization of a probability that a simulated image is the same as the at least one training image, and wherein the simulated image is defined as a summation of up-sampled, filtered, and geometrically transformed training sub-frames.

6. The method of claim 1, wherein the at least one training image comprises at least one white noise image.

7. The method of claim 1, wherein the at least one training image comprises at least one impulse image.

8. The method of claim 1, wherein generating the plurality of sub-frames comprises:

identifying a plurality of sets of pixels in the first image frame, each identified set of pixels corresponding to a pixel in one of the sub-frames;

identifying a plurality of sets of the map values, each identified set of map values corresponding to one of the identified sets of pixels; and

filtering the identified plurality of sets of pixels in the first image frame with the identified plurality of sets of map values, thereby generating sub-frame pixel values for the plurality of sub-frames.

9. The method of claim 8, wherein the plurality of sets of pixels in the first image frame are identified by geometrically mapping points in the plurality of sub-frames to corresponding points in the first image frame.

10. The method of claim 9, wherein each of the plurality of sets of pixels in the first image frame is a window of pixels around a mapped point in the first image frame.

11. The method of claim 1, and further comprising:

storing the plurality of map values in at least one look-up table.

12. The method of claim 11, wherein the at least one look-up table comprises one look-up table for each of the plurality of projectors.

13. The method of claim 11, wherein the at least one look-up table is addressed by positions of pixels in the plurality of sub-frames.

14. A system for displaying an image, the system comprising:

a plurality of projection devices;

a buffer adapted to receive a first image frame;

a sub-frame generator configured to define a plurality of sub-frames corresponding to the first image frame based on a geometric relationship between a reference coordinate system and the plurality of projection devices, and based on a plurality of stored map values that are computed during a training phase of the system; and

wherein the plurality of projection devices are adapted to project the plurality of sub-frames onto a target surface, thereby producing a resulting image on the target surface.

15. The system of claim 14, wherein the plurality of map values are computed by generating a plurality of training sub-frames based on at least one training image, identifying a plurality of sets of pixels in the at least one training image, each set of pixels corresponding to a pixel in one of the training sub-frames, and computing a set of map values for each identified set of pixels.

16. The system of claim 15, wherein the plurality of training sub-frames are generated by the sub-frame generator in an iterative process based on maximization of a probability that a simulated image is the same as the at least one training image.

17. The system of claim 16, wherein the simulated image is defined as a summation of up-sampled, filtered, and geometrically transformed training sub-frames.

18. The system of claim 14, wherein the sub-frame generator is configured to define the plurality of sub-frames by identifying a plurality of sets of pixels in the first image frame, each identified set of pixels corresponding to a pixel in one of the sub-frames, identifying a plurality of sets of the map values, each identified set of map values corresponding to one of the identified sets of pixels, and filtering the identified plurality of sets of pixels in the first image frame with the identified plurality of sets of map values, thereby generating sub-frame pixel values for the plurality of sub-frames.

19. The system of claim 14, and further comprising:

a plurality of look-up tables for storing the map values, wherein each of the look-up tables corresponds to one of the projection devices.

20. A method of generating sub-frames for display by a display system, the method comprising:

receiving a plurality of training images during a training phase of the display system;

generating a plurality of sets of training sub-frames during the training phase, each set of training sub-frames corresponding to one of the training images;

generating a plurality of map values during the training phase based on the plurality of sets of training sub-frames;

receiving a first image frame during a normal operation phase of the display system; and

generating a plurality of sub-frames during the normal operation phase based on the plurality of map values, the plurality of sub-frames corresponding to the first image frame and configured to be projected by a corresponding plurality of projectors to produce a resulting image.