20
z
For plastic MT (1’’ and ½’’). Put the MT with its working surface (of brown
colour) facing down
(facing MOV) . It should be noted that when using ½’’ MT, it is
inserted into a paper cartridge beforehand . It means that the ½’’ MT is put with its
working surface (of brown colour) facing down while the paper cartridge is located on
top of MT .
z
Straighten MT holding it by its edges and insert it into the mouth of the tape receiving
magazine (Figure 3, pos .1) . Insert MT into the tape receiving magazine to a depth of
30 mm (until blocked) . The red LED (Figure 3, pos . 4) lights up confirming the state
“MT in the buffer” and the electric motor starts to capture the tape . Insert the tape
further inside the tract until it is captured by the drive shaft of OMB . The green LED
(Figure 3, pos . 4) lights up confirming the state “MT in the tract”) .
Release MT strip
and it will move forward automatically.
z
Wait for approximately 5 seconds to load the potentially informative sector of the
magnetic copy into MOV zone . Start stitching process by corresponding software
command . Stitching process is confirmed by green LED blinking (Figure 3, pos . 4)
with the meaning “MT in the tract” . The first visualization sub-frame appears on the PC
screen .
z
Control the quality of stitching visually . When signs of low quality of magnetic copying
are observed (due to MT non-contact with tested surface, MT or scanner warp during
copying, etc .), it is possible to stop stitching process with “Eject MT” command . As soon
as MT is returned to the buffer, extract it, demagnetize, and make another magnetic
copy in conformity with paragraph 2 .2 .2 .3 .
z
In case of satisfactory magnetic copy quality, stitching can be continued until the end
of the informative sector and be stopped with “Eject MT” command, or wait for OMB
termination in automatic mode (“MT end” led comes on) .
z
As soon as the OMB receives the command “Eject MT”, used MT automatically returns to
the buffer – to the tape-receiving magazine or to the bunker – (to the closest location) .
The green LED “MT in the tract” is fading indicating that MT stopped moving . The
red LED “MT in the buffer” comes on .
Do not remove an MT strip from the tape-
receiving magazine until it fully stops and the led “MT in the tract” is off!
z
Take the MT by its edges and remove it from the buffer . The red LED “MT in the buffer”
will go out . It is required to demagnetize the used magnetic copy for its further use
and place it into the Combination Magnetic Scanner case or store it for future use .
Processing and analyzing magnetic copy stitching
z
Rotate the stitched copy and match it with the original, using manipulation functions:
image rotation and flipping .
z
Evaluate the quality of stitching visually . If the quality is satisfactory, save the initial
file and start processing and analyzing . If the quality is unsatisfactory, repeat magnetic
copy stitching or make a new magnetic copy .
z
Process the stitched image using software functions . In general the following functions
give the most effective results: threshold processing with the possibility of brightness
levels band spreading, image differentiation and spatial filtering .
z
Examine magnetic copy stitching:
{
visually determine signs of number digits alteration, such as traces of
mechanical processing taking the form of traces or flutes (Figure 4: 2
nd
,
4
th
and 6
th
digit positions); original number fragments (Figure 4: 2
nd
and
6
th
digit positions); non-ferromagnetic materials fragments (Figure 4: 4
th
digit position); welded seams and borders of pressing in (Figure 4: 4
th
digit
position);
{
additional investigated features are: deviation of form and arrangement of
digits in the number; different intensity (clearness) of the number digits
contour; non-uniformity or absence of the object surface texture processing .
It should be taken into account that the last two features can result from
a poor quality copying (magnetic tape poor fitting to the surface);
{
compare digits images with specimen VINs or with repeating symbols in
examined number;
Extraction of a used magnetic copy
Содержание 7505M
Страница 2: ......
