Methods and systems for calibrating rear projection video

1. A method for calibrating a video display system, comprising:

receiving an indication that a display screen of the video display system has been tilted to expose a video projector;

generating a test image to display on the tilted display screen in order to calibrate the video projector, wherein the test image is altered to fit the tilted display screen;

projecting the test image onto the tilted display screen; and

calibrating the video projector using the test image.

2. The method of claim 1 , wherein the test image is altered by correcting trapezoidal distortion of the image displayed on the tilted display screen.

3. The method of claim 1 wherein generating the test image comprises:

retrieving the test image from memory which has been altered to fit the tilted display screen.

4. The method of claim 1 , wherein generating the test image comprises:

determining an amount to alter the test image based on an angle of tilt of the display screen; and

altering the test image based on the determined amount.

5. The method of claim 4 , further comprising:

storing the altered test image in memory.

6. The method of claim 4 , wherein the test image is altered to compensate for a trapezoidal distortion of the test image.

7. The method of claim 4 , wherein determining the amount to alter the test image comprises:

projecting an unaltered test image on the tilted display screen; and

modifying the unaltered test image until the unaltered test image fits the tilted display screen.

8. The method of claim 7 , wherein modifying the test image comprises modifying at least one dimension of the unaltered test image.

9. The method of claim 7 , wherein modifying the test image comprises:

receiving input from a user when the unaltered test image fits the tilted display screen.

10. A video system, comprising:

a video projector located in a housing;

a display screen disposed adjacent to the housing, wherein the display screen is capable of being tilted to expose the video projector;

logic for generating a test image in response to the display screen being tilted, wherein the test image is altered to fit the tilted display screen;

logic for projecting the test image onto the tilted display screen in order to calibrate the video projector; and

logic for calibrating the video projector using the test image.

11. The video display system of claim 10 , further comprising:

logic for determining an amount to alter the test image based on an angle of tilt of the display screen; and

logic for altering the test image based on the determined amount.

12. The video system of claim 11 , wherein the logic for determining an amount to alter the test image, comprises:

logic for projecting an unaltered test image on the tilted display screen; and

logic for modifying the unaltered test image until the unaltered test image fits the tilted display screen.

13. The video system of claim 12 , further comprising an input for receiving input from a user when the unaltered test image fits the tilted display screen.

14. The video system of claim 11 , further comprising a memory for storing the altered test image.

15. The video system of claim 10 , further comprising:

a memory for storing the test image.

16. The video system of claim 10 , further comprising:

a video source housed within the video projector.

17. A video system, comprising:

means for projecting video onto a display screen, wherein the display screen is capable of being tilted to expose the video projecting means;

means for generating a test image in response to the display screen being tilted in order to calibrate the video projector, wherein the test image is altered to fit the tilted display screen; and

means for calibrating the video projector using the test image.

18. The video display system of claim 17 , further comprising:

means for determining an amount to alter the test image based on an angle of tilt of the display screen; and

means for altering the test image based on the determined amount.

19. The video system of claim 18 , wherein the means for determining an amount to alter the test image, comprises:

means for projecting an unaltered test image on the tilted display screen; and

means for modifying the unaltered test image until the unaltered test image fits the tilted display screen.

20. The video system of claim 17 , further comprising:

means for storing the test image.