FCM_User Reference Manual.pdf.pdf - 第232页
Pr oduc t Ch ang e Ov er User Re f eren ce Manu al 4022 591 960 82 6-40 FCM M ult ifle x 02.02 SCREEN 6- 34 ■ Rea d the [Av erage grey leve l in area] v alue for ba dmark and its ba ckgro und ■ Use a value in be tw een a…
4022 591 96082 User Reference Manual
02.02 FCM Multiflex 6-39
Product Change Over
NOTE: It is possible - but not recommended - to set the >/LJKW /HYHO@ and
>7KUHVKROG@ manually as in nearly all cases the correct settings will be
supplied automatically by selecting >7HDFK@.
Before setting the threshold value for the binary algorithm, first the grey levels of
the fiducial and its background have to be determined. Proceed as follows:
■ Select
[Measure Greylevel] to determine the grey levels of the fiducial and its
background
SCREEN 6-33
■ Select with the tracker ball and the sliders successively a spot with a repre-
sentative grey level in the fiducial and one in the background
Product Change Over
User Reference Manual 4022 591 96082
6-40 FCM Multiflex 02.02
SCREEN 6-34
■ Read the [Average grey level in area] value for badmark and its background
■ Use a value in between as the
[Threshold] level to be set
NOTE: In demanding situations some try-outs may be required, e.g. reset camer-
aposition (if background is out of view), selection of another badmark etc.
Area of Interest
The [Area of Interest] determines where the system will look for the badmark. It
should cover a part of the bad mark and the background.
For spot-type badmarks:
■ Select
[Area of Interest]
SCREEN 6-35
4022 591 96082 User Reference Manual
02.02 FCM Multiflex 6-41
Product Change Over
FIGURE 6-14 Area of interest for spot-type badmark detection
■ Toggle with
<F5> between [Move] and [Resize] as necessary
■ Position and resize the area of interest with the arrow keys or by means of the
tracker ball and the scroll bars
The X and Y value indicate the centre of the search area with respect to the centre
of the BVM camera.
For fiducial-type badmarks:
■ Select
[Area of Interest]
The [Area of Interest] determines where the system will look for the badmark.
In this way “confusing” elements - like certain print patterns - can be avoided.
NOTE: It is recommended to make the area of interest not larger then necessary,
for a large area of interest will increase the time required for a meas-
urement.