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Method and apparatus for calibrating a display using an array of cameras
| Details |
Inventors: Johnson, Michael J.; Chen, Chung-Jen; Chandrasekhar, Rajesh;
Assignee: Honeywell International Inc. (Morristown, NJ)
Primary Examiner: Kostak; Victor R.
Assistant Examiner:
Attorney, Agent or Firm: Shudy, Jr.; John G.
The present invention overcomes many of the disadvantages of the prior art by providing a display that can be calibrated and re-calibrated with a minimal amount of manual intervention. To accomplish this, the present invention provides one or more cameras to capture an image that is projected on a display screen. In one embodiment, the one or more cameras are placed on the same side of the screen as the projectors. In another embodiment, an array of cameras is provided on either or both sides of the screen for capturing a number of adjacent and/or overlapping capture images of the screen. In either of these embodiments, the resulting capture images are processed to identify any non-desirable characteristics including any visible artifacts such as seams, bands, rings, etc. Once the non-desirable characteristics are identified, an appropriate transformation function is determined. The transformation function is used to pre-warp the input video signal to the display such that the non-desirable characteristics are reduced or eliminated from the display. The transformation function preferably compensates for spatial non-uniformity, color non-uniformity, luminance non-uniformity, and/or other visible artifacts. |
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DETAILED DESCRIPTION The present invention overcomes many of the disadvantages of the prior art by providing a display that can be calibrated and re-calibrated with little or no manual intervention.
To accomplish this, the present invention provides one or more cameras for capturing an image that is shown on a display viewing surface or viewing screen.
In one illustrative embodiment, the one or more cameras are placed on the viewing side of the displays.
In another illustrative embodiment, the one or more cameras are place on the non-viewing side of the displays, for example between the backlight and an adjoining LCD or on the inside and rear of the vacuum bottle in the case of a CRT.
In one illustrative embodiment, the one or more cameras are placed on the same side of the screen as the projection display.
In another illustrative embodiment, an array of cameras is provided on either or both sides of the screen for capturing a number of adjacent and/or overlapping capture images of the screen.
In any case, the resulting capture images are processed to identify any non-desirable characteristics therein including any visible artifacts such as seams, bands, rings, etc.
Once the non-desirable characteristics are identified, an appropriate transformation function is determined.
The transformation function is used to pre-warp the input video signal to the display such that the non-desirable characteristics are reduced or eliminated from the display.
The transformation function preferably compensates for spatial non-uniformity, color non-uniformity, luminance non-uniformity, and/or other visible artifacts.
In one illustrative embodiment, a screen is provided that has a first side and a second side.
For a rear projection display, the first side may correspond to the projection side, and the second side may correspond to the viewing side.
For a front projection display, the first side may correspond to both the projection and viewing side of the screen.
In one illustrative embodiment, a projector is provided for projecting an image onto the projection side of the screen, and a camera or camera array is provided for capturing a capture image or capture image segment from the projection side of the screen
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