|
As it is well-known, the passive THz camera allows seeing concealed object without contact with a person and this
camera is non-dangerous for a person. Obviously, efficiency of using the passive THz camera depends on its
temperature resolution. This characteristic specifies possibilities of the detection for concealed object: minimal size of
the object; maximal distance of the detection; image quality. Computer processing of the THz image may lead to many
times improving of the image quality without any additional engineering efforts. Therefore, developing of modern
computer code for its application to THz images is urgent problem. Using appropriate new methods one may expect
such temperature resolution which will allow to see banknote in pocket of a person without any real contact. Modern
algorithms for computer processing of THz images allow also to see object inside the human body using a temperature
trace on the human skin. This circumstance enhances essentially opportunity of passive THz camera applications for
counterterrorism problems.
We demonstrate opportunities, achieved at present time, for the detection both of concealed objects and of clothes
components due to using of computer processing of images captured by passive THz cameras, manufactured by various
companies. Another important result discussed in the paper consists in observation of both THz radiation emitted by
incandescent lamp and image reflected from ceramic floorplate.
We consider images produced by THz passive cameras manufactured by Microsemi Corp., and ThruVision Corp., and
Capital Normal University (Beijing, China). All algorithms for computer processing of the THz images under
consideration in this paper were developed by Russian part of author list.
Keywords: THz wave, passive imaging camera, computer processing, security screening, concealed and forbidden objects,
reflected image, hand seeing, banknote seeing, ceramic floorplate, incandescent lamp.
|
