Originally Posted by
RichardKenner
Yes, but one way you detect something hidden on something is by imaging. So I don't see your point.
No, that is the way
a person detects something; looking at an image.
A metal detector detects metal; it beeps.
A smoke detector detects smoke; it beeps.
Taking a picture does not detect anything.
(edited to add)
In a few years the MMW technology may be able to detect explosives through spectral analysis. IMHO If this happens, and the machine is used in a mode that automatically sets off an alarm of some sort (instead of showing the operator an image) then the machine would be considered a detector.