Hewlett-Packard Development Company, L.p.

Derek Wade

Tiffany Lee Greyson

John Heineck

Adam Greystone

Tyelisa C Shields

In an example, an apparatus is described that includes a transparent platen, a substrate, an array of light sources, and a sensor. The substrate is positioned on one side of the platen and has substantially uniform reflective properties. The array of light sources is positioned on an opposite side of the platen from the substrate and includes a plurality of light sources that emits light in a visible spectrum and a light source that emits light in an invisible spectrum. The sensor is positioned on the opposite side of the platen from the substrate and detects reflected portions of the light in the visible spectrum and the light in the invisible spectrum.

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Boise, ID, United States of America

Derek Wade