Terahertz imaging is making that happen. Using ultrashort bursts of terahertz radiation (between microwave and infrared) and an algorithm that can identify alpha-numeric characters and symbols, researchers at MIT and Georgia tech can now read through a stack of paper. It could also be done with X-rays but those are radioactive and rely on metals. The new system isn't and it can reflect from non-metallic inks.
This Device Can Read the Pages of a Book Without Opening It
This technique could have a lot of cool applications. Thoughts?
This Device Can Read the Pages of a Book Without Opening It
This technique could have a lot of cool applications. Thoughts?