System and method for display grid characterization, calibration, and verification

• US 7,075,552 B2
• Filed: 07/07/2004
• Issued: 07/11/2006
• Est. Priority Date: 08/25/2003
• Status: Expired due to Fees

• Current Assignee: Remote Director, LLC
• Original Assignee: Integrated Color Solutions, Inc.
• Inventors: Herbert, Franz H., Caldwell, Daniel G.
• Primary Examiner(s): Tung, Kee M.
• Assistant Examiner(s): CASCHERA, ANTONIO A
• Application Number:
  US10/886,465
• Publication Number:
  US 20060007240A1
• Time in Patent Office: 734 Days
• Field of Search: 345 11- 34, 345/589, 345/617
• US Class Current: 345/589
• CPC Class Codes: G06F 3/1446 display composed of modules, e.g. video walls
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2370/027 Arrangements and methods specific for the display of internet documents

Abstract

This invention is directed to a system and method for creating characterization information and a correction map from a first display grid that can be transmitted and used by a second display grid. Computer readable instructions embodied in a computer readable medium calibrate a first display grid and create an ICC color profile and correction map from said calibration information, such that an image to be displayed across an entire display grid which is segmented into portions corresponding to each display device in the display grid is displayed with uniform luminance and color across the entire display grid. The invention can then store the correction map and characterization information and send the information to a second display device for it to use. Alternatively, the calibration or characterization information can be associated with an image file and sent to a second location for display.

Claims

1. A system of calibrating a display grid having a plurality of display devices comprising:

a computer readable medium; and

,

a set of computer readable instructions embodied in said computer readable medium for initializing lookup table values representing default luminance levels of said first display device, measuring the output of each one of said plurality of display devices of said display grid, determining a gray ramp for each display of said display grid from said output measurements, mapping said gray ramp to L* of CIELAB color model of said first display device, adjusting said lookup table values of each display of said display grid according to said gray ramp mapping and L*, determining a pixel array according to said lookup tables for each of said display devices of said display grid, extrapolating said pixel array into a correction map for each of said display devices of said display grid so that said correction map can be used to display an image with consistent luminance and color across said display grid.

2. The system of claim 1 wherein said computer readable instructions include instructions for receiving an electronic image to be displayed across said display grid and segmenting said electronic image into segments corresponding to at least one display device of said display grid.

3. The system of claim 2 wherein said computer readable instructions include instructions for modifying at least one segment of said electronic image according to said correction map.

4. The system of claim 1 wherein said computer readable instructions include instructions for transmitting luminance information for use by a second display grid.

5. The system of claim 4 wherein said computer readable instructions include instructions for receiving information representing a determination of said second display grid'"'"'s ability to utilize said luminance information.

6. The system of claim 5 wherein said computer readable instructions include instructions for notifying a user if said second display grid cannot utilize said luminance information.

7. The system of claim 1 wherein said correction map includes pixel multipliers for each pixel of each display device.

8. A system for calibrating a display grid comprising:

a computer readable medium;

a plurality of display devices in communications with said computer readable medium; and

,

a set of computer readable instructions embodied in said computer readable medium for initializing lookup table values representing default luminance levels of each one of said display devices of said display grid, segmenting said display devices into a plurality of grid areas, measuring the output of said grid areas according to said initial lookup table values, determining a grey ramp according to said output measurements, mapping said gray ramp to L* of CIELAB color model of said first display device, adjusting said lookup table values according to said gray ramp mapping and L*, extrapolating said lookup table values into a correction map so that said correction map can be used to display an image with consistent color and luminance across said display grid.

9. The system of claim 8 wherein said correction map includes pixel multipliers for each pixel of each display device.

10. The system of claim 8 wherein said computer readable instructions include instructions for receiving an electronic image to be displayed across said display grid and segmenting said electronic image into segments corresponding to at least one display device of said display grid.

11. The system of claim 10 wherein said computer readable instructions include instructions for modifying at least one segment of said electronic image according to said correction map.

12. The system of claim 8 wherein said computer readable instructions include instructions for transmitting luminance information for use by a second display grid.

13. The system of claim 12 wherein said computer readable instructions include instructions for receiving information representing a determining of said second display grid'"'"'s ability to utilize said luminance information.

14. The system of claim 13 wherein said computer readable instructions include instructions for notifying a user if said second display grid cannot utilize said luminance information.