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  • Touch Screen coffee table DIY with 32" TV and low cost CCD sensor

    So, two ideas, have you looked into these?1: since a normal page is twice as wide as the CCD sensor, that means the flatbed scanner had to have a way to warp 8.5 inches of image into a 4 inch strip and then warp it back out afterward. It would seem then that you could use some sort of lenses or something to focus the image of the entire line of LEDs into the 4 inch sensor bar to get a full view of the LED bar.2: Seems like putting one of these on each axis (so like sensors on the bottom and right of the TV, LEDs on the top and left) would allow complete multitouch, because the worst case scenario is that you have a right triangle of points, so each axis is missing one point, but the other axis catches it. You'd probably have to halve your speed this way, but maybe not, you might be ab...see more »So, two ideas, have you looked into these?1: since a normal page is twice as wide as the CCD sensor, that means the flatbed scanner had to have a way to warp 8.5 inches of image into a 4 inch strip and then warp it back out afterward. It would seem then that you could use some sort of lenses or something to focus the image of the entire line of LEDs into the 4 inch sensor bar to get a full view of the LED bar.2: Seems like putting one of these on each axis (so like sensors on the bottom and right of the TV, LEDs on the top and left) would allow complete multitouch, because the worst case scenario is that you have a right triangle of points, so each axis is missing one point, but the other axis catches it. You'd probably have to halve your speed this way, but maybe not, you might be able to judge the strength of the shadows in each area to do both axes at the same time.

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