Ghost-compensation for improved stereoscopic projection

• US 20060268104A1
• Filed: 05/25/2006
• Published: 11/30/2006
• Est. Priority Date: 05/26/2005
• Status: Abandoned Application

• Current Assignee: RealD Incorporated
• Original Assignee: Real D
• Inventors: Greer, Josh, Lipton, Lenny, Cowan, Matt
• Application Number:
  US11/441,735
• Publication Number:
  US 20060268104A1
• Time in Patent Office: Days
• US Class Current: 348/42
• CPC Class Codes: G02B 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G02B 30/24 involving temporal multiplexing, e.g. using sequentially activated left and right shutters
• CPC Class Codes: G02B 30/25 using polarisation techniques
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: H04N 13/10 Processing, recording or transmission of stereoscopic or multi-view image signals
• CPC Class Codes: H04N 13/106 Processing image signals for multi-view video sequence encoding H04N19/597
• CPC Class Codes: H04N 13/15 for colour aspects of image signals
• CPC Class Codes: H04N 13/332 Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
• CPC Class Codes: H04N 13/337 using polarisation multiplexing
• CPC Class Codes: H04N 13/363 using image projection screens volumetric display H04N13/388

Abstract

A method and system for reducing ghost images in plano-stereoscopic image transmissions is provided. The method comprises establishing a plurality of expected ghosting profiles associated with a plurality of predetermined regions on a screen, and compensating for leakage in each predetermined region of a projected left and right eye images by removing an amount of ghost images leaking from the projected left eye image into the projected right eye image and vice versa. The system comprises a processor configured to receive the quantity of ghost artifacts and compute ghost compensation quantities for left eye images and right eye images. The processor is further configured to remove an amount of actual image ghost artifacts leaking from a projected left eye image into a projected right eye image and vice versa. The processor is also configured to compute ghost compensation quantities for each of a plurality of zones, each zone corresponding to a region on a screen having an expected ghosting profile associated therewith.

Claims

1. A method for reducing visual ghost artifacts in plano-stereoscopic image transmissions, comprising:

dividing a hypothetical screen representation into a plurality of regions corresponding to regions on a projection screen;

computing at least one ghost artifact coefficient depending upon expected ghosting within an associated region established by said dividing, each ghost artifact coefficient representing ghost artifacts leaking from a left eye image into a right eye image and from the right eye image into the left eye image;

applying at least one ghost artifact coefficient for a left eye projected image to a right eye projected image to form a compensated right eye projected image; and

removing the compensated right eye projected image from the right eye projected image.

2. The method of claim 1, further comprising:

performing a calibration function comprising assessing ghost artifacts using a test pattern comprising at least one right eye test image and at least one left eye test image projected to each of a right eye element and a left eye element of a selection device and establishing an expected ghosting profile based on the assessed ghost artifacts;

wherein the computing comprises computing the ghost artifact coefficients based on the expected ghosting profile.

3. The method of claim 1, further comprising:

performing a calibration function comprising computing an expected ghosting profile based on a computer model of a theatre;

wherein the computing comprises computing the ghost artifact coefficients based on the expected ghosting profile.

4. The method of claim 1, further comprising:

applying at least one ghost artifact coefficient for a right eye projected image to a left eye projected image to form a compensated left eye projected image; and

removing the compensated left eye projected image from the left eye projected image.

5. The method of claim 1, wherein said computing comprises computing ghost artifacts for a multiple of attributes associated with the left eye image and the right eye image.

7. The method of claim 1, wherein said computing, applying, and removing occur within a projector.

8. The method of claim 1, wherein said dividing produces a segmented ghosting map, and said computing is based on the segmented ghosting map.

6. The method of claim 6, wherein the multiple of attributes comprises a red attribute, a green attribute, and a blue attribute.

9. A method for reducing ghost images in plano-stereoscopic image transmissions, comprising:

establishing a plurality of expected ghosting profiles associated with a plurality of predetermined regions on a screen; and

compensating for leakage in each predetermined region of a projected left eye image and a projected right eye image by removing an amount of ghost images leaking from the projected left eye image into the projected right eye image and from the projected right eye image into the projected left eye image.

10. The method of claim 9, further comprising:

assessing ghost artifacts using a test pattern comprising at least one right eye test image and at least one left eye test image projected to each of a right eye element and a left eye element of a selection device and establishing an expected ghosting profile based on the assessed ghost artifacts;

wherein the compensating comprises compensating for leakage based on the expected ghosting profile.

11. The method of claim 9, further comprising:

computing an expected ghosting profile based on a computer model of a theatre;

wherein the computing comprises computing the ghost artifact coefficients based on the expected ghosting profile.

12. The method of claim 9, wherein said compensating comprises computing ghost artifacts for a multiple of attributes associated with the left eye image and the right eye image.

14. The method of claim 9, wherein said compensating occurs within a projector.

15. The method of claim 9, wherein said establishing produces a segmented ghosting map, and said compensating is based on the segmented ghosting map.

13. The method of claim 13, wherein the multiple of attributes comprises a red attribute, a green attribute, and a blue attribute.

16. A system for reducing ghost images in plano-stereoscopic image transmissions, comprising:

a processor configured to receive the quantity of ghost artifacts and compute ghost compensation quantities for left eye images and right eye images and further configured to remove an amount of actual image ghost artifacts leaking from a projected left eye image into a projected right eye image and from the projected right eye image into the projected left eye image;

wherein the processor is configured to compute ghost compensation quantities for each of a plurality of zones, each zone corresponding to a region on a screen having an expected ghosting profile associated therewith.

17. The system of claim 16, wherein the processor computes a compensated projected right eye image and a compensated projected left eye image, the system further comprising a screen configured to receive the compensated projected right eye image and a compensated projected left eye image and display the compensated projected right eye image and a compensated projected left eye image to a viewer.

18. The system of claim 16, further comprising:

a calibration arrangement configured to transmit a plano-stereoscopic test pattern to a screen; and

a selector device and at least one sensor configured to receive transmissions from said screen and assess a quantity of ghost artifacts received in a left eye of the selector device from a right image from the test pattern and vice versa.

19. The system of claim 16, further comprising a mathematical modeling device configured to compute a mathematical model of a theater screen arrangement, wherein said processor is further configured to compute ghost compensation quantities based on the mathematical model of the theater screen arrangement.

20. The system of claim 16, wherein said processor is configured to compute ghost compensation quantities for each of a plurality of image attributes.