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Start with a glass table and place it under an overhead light. Use onion paper (or some other semitransparent paper) and regular pens/pencils. Put a digital camera under the table point up at the bottom of the paper. As the participant draws on the paper, their shadow may indeed be be captured by the camera, but the point of the writing tool, and any opaque ...


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You might want to consider a traditional classroom solution of using a document camera. Picture an old school overhead projector, but instead of projecting the image on the wall, it transmit digitally and you can put it up on a digital screen. Once it's in digital format, you can use any screen capture software to record this. Yes, the writers hand will ...


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I did a very simplistic test of this. I did not implement a software solution. Rather, I simply captured a video of myself gazing, for a few seconds at a time, at each corner of the screen of an iPad 2. I cropped the video to my eyes only, and examined it manually. Using the pupil and "screen glint", I could very easily determine which corner I had been ...


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The iPad Air 2's front camera has 1.2MP resolution, or 1280x960 pixels. Let's make some assumptions: The horizontal field of view is 60° Users hold their tablets about 450mm from their eyes Eyeballs are about 24mm in diameter So, at the distance of a user's eyeball, one pixel covers (450mm * tan(60 / 1280))mm = 0.37mm. Let's see how much an eyeball ...



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