Disclosed are an energy spectrum modulation apparatus, a material
discrimination method and a device thereof, as well as an image
processing method are disclosed, which can discriminate the material in
large- and medium-sized objects such as cargo containers, air cargo
containers, etc. by using X-rays having different energy levels. The
energy spectrum modulation apparatus comprises a first energy spectrum
modulation part for modulating a first ray having a first energy
spectrum, and a second energy spectrum modulation part coupled to the
first energy spectrum modulation part and for modulating a second ray
having a second energy spectrum different from the first energy spectrum.
The present invention can be used in the non-opening inspection for
large-sized container cargo at places such as Customs, ports and
airports.