The Eyewriter 2.0 requires a few pieces of software for building and running.
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Additionally, the glints (reflections of the IR illuminators) of the dark frame are tracked, and these, plus the info on the pupil, is calibrated to screen position using a least squares fitting process for an equation that provides a mapping of glint/pupil position to screen position. The difference between the two allows us to isolate and track the pupil in realtime. On even frames, the pupil appears bright, since the IR light is actually bouncing off the back of your eye, like red eye effect. On even frames, it uses the center illuminator (located around the camera lens) and on odd frames it uses the 2 side illuminators. Finally, we'll setup the base for the system and go through the basics of the software.įrom a technical perspective, the 2.0 system works by strobing 3 IR illuminators every frame. Third, we'll be programming and building the arduino / cirucit to control the blinking.
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Second, we'll be hacking the PS3 eye camera to get the vertical sync (when the frame of video is being taken) and to make it sensative to IR. First, we'll be making LED illuminators for the sides of the screen and the center. The basic idea approach is that we'll be doing a few things. Thanks also to the Studio for Creative Inquiry / CMU for hosting a session for development) This fall, we've been showing off and demoing the 2.0 device - check out the eyewriter 2.0 in action - we even hooked it up to a robotic arm, to draw the artwork people make with their eyes: (The 2.0 device was designed with help and input from Takayuki Ito, Kyle McDonald, Golan Levin and students of the eyewriter collab at Parsons MFADT.
Traditional commercial eye trackers costs between $9000-$20,000, so this is a magnitude of order cheaper, and is designed to help anyone who wants or needs an eyetracker. At the moment, it costs about 200$ in parts. This eyewriter system is cheap, and completely open source. The 2.0 design, which uses a camera and LED system mounted away from the head, can be used by people whose heads are moving slightly, such as MS patients, and people who wear glasses, etc. The original eyewriter, designed for a paralyzed Graffiti artist TEMPT1, is designed to be worn on a completely motionless head. Since that first video, we've been hacking on and developing the project, and we have a new design, which we've called "eyewriter 2.0" which improves the accuracy of the device, and allow for people who's heads are moving slightly to also use an eye tracker. The original design, as shown here, featured a pair of glasses as the basis for the eyewriter design: The EyeWriter is a low-cost eye-tracking apparatus + custom software that allows graffiti writers and artists with paralysis resulting from Amyotrophic Lateral Sclerosis to draw using only their eyes.