Image like that can be obtained by
taking a picture of the CRT screen. The result of filtering
with gaussian frequency filter from Fig. 4c) is in Fig. 4d).
The line-structure is corrected but the output image is
slightly blurred.
The Image Processing Application’s fourth subunit is
the Noise Addition. The list of available noise fields and
their parameters with the description can be found in the
first part of this paper.