A linescan projector and camera can be offset from each other around a display, such as the linescan projector being at the top of the display and the camera being at the side of the display. The linescan projector can sweep vertical lines horizontally, and the camera can capture horizontal images at different vertical locations. A processor can construct an image of a user’s face that appears to have been taken from a middle of the screen, creating the appearance that the user is looking directly into the camera.
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Russell, Andrew Ian, "Linescan Projector and Camera Offset From Each Other Around Display for Creating Image that Appears to be Captured from Middle of Display", Technical Disclosure Commons, (May 12, 2017)