Projected image light pen
First Claim
Patent Images
1. A system for providing interaction with a projected video image, comprising:
- means for generating a video image;
means for projecting an enlarged version of the video image;
a light pen for generating a spot on the projected image; and
image comparison means for causing the video image generating means to respond to differences between the video image and the projected image;
wherein the image comparison means compares the combination of the projected image and the spot to the video image.
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Abstract
A technique for interaction with a projected video image with a light pen and/or target marks on the projection screen in which light reflected from the projected image is compared with the video image to detect the position of a spot positioned on the projected image by the light pen and/or the reflection of the target marks. The computer used to generate the video image is then caused to position a cursor in the video image in response to the spot position and/or otherwise modify the generated and/or projected video image.
127 Citations
14 Claims
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1. A system for providing interaction with a projected video image, comprising:
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means for generating a video image; means for projecting an enlarged version of the video image; a light pen for generating a spot on the projected image; and image comparison means for causing the video image generating means to respond to differences between the video image and the projected image; wherein the image comparison means compares the combination of the projected image and the spot to the video image. - View Dependent Claims (2, 3, 4)
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5. A system for providing interaction with a projected video image, comprising:
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means for generating a video image; means for projecting an enlarged version of the video image; a projection screen on which the enlarged version of the video image is projected; target marks on the projection screen; and image comparison means for causing the video image generating means to respond to differences between the video image and the projected image; wherein the image comparison means compares the combination of the projected image and the targets to the video image. - View Dependent Claims (6, 7)
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8. A method of providing interaction with a projected video image, comprising the steps of:
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generating a video image; projecting an enlarged version of the video image; generating a spot on the projected image; comparing the combination of the projected image and the spot to the video image; and modifying the video image generated in response to differences between the video image and the projected image. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification