User`s manual

Binarization Level
Briefly, the binurizution level controls the luminance
threshold at which the SLS differentiates the inspected
object from its background. Its value ranges from 0 to 255.
The lower the value, the closer the binarization level is to
the background luminance level; the higher the value, the
closer the binarization level is to the inspected object’s
luminance level.
In effect, the SLS ignores everything in the Line Image that
falls below the binarization level. It looks for the inspected
object at or above that level only.
In the View Image display, increasing the value of the
binarization level moves the binarization level indicator
upward. Figure 6.14 (page 6-16) shows the position of the
indicator when the binarization value is set to 56. This
value is relative to the position of the background probe.,
which is located at 23.9% of the FOV. The binarization
level “rides” the background probe as the probe detects
variations in the background luminance. Thus, the value of
the binarization level always remains 56 units (in this case)
above the background luminance.
In Figure 6.15, page 6-18, the binarization level indicator is
in approximately the same vertical position as it is in
Figure 6.14 (page 6-16), but its value is 138. This is true
because the background probe is set to 0% of the FOV,
which disables the probe. Thus, the binarization level has
an absolute value of 138 [where 0 is at the base of the Line
Image, and 255 is at the top), and it does not vary with
changes in the background luminance level.
Background Probe
The background probe (or “light” probe) can measure the
luminance anywhere within the FOV, and its position is
indicated as a percentage of the FOV. Normally, it should
be set to a point on the FOV that is appropriate for
monitoring the background luminance level.
When the probe position value is set to O%, it is flush with
the left edge of the Line Image. In this position, the probe is
disabled, and the binarization level isfixed. This is shown
in Figure 6.15 (page 618).
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