Method and apprartus thereof for detecting a hidden image in...

Details Method and apprartus thereof for detecting a hidden image in... Method and apprartus thereof for detecting a hidden image in...

2006-07-11

2006-07-11

Chawan, Sheela (Department: 2624)

Image analysis

Pattern recognition

Template matching

C359S009000, C359S035000, C369S103000, C369S044370, C356S450000

Reexamination Certificate

active

07076100

ABSTRACT:
An apparatus for detecting a hidden image, which is formed in a first area of a hologram, is disclosed. The apparatus has a laser device for generating a laser beam and projecting the laser beam to the hologram, and a sensing device for sensing light that reflects from the hologram. When the laser beam is emitted to the hologram at a first incident angle, at least one diffractive beam is generated by diffraction of the laser beam. The sensing device is capable of outputting a responding signal according to the characteristics of the diffractive beam. Additionally, if the laser beam is emitted to the hologram at an incident angle, which is not equal to the first incident angle, the diffractive beam cannot be generated so that the sensing device does not output the responding signal.

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