Panasonic PV500 User Manual page 69

Setting Offset
What is Offset?
Set which brightness in camera gray values is used as 0 for inspection gray values when converting
the camera gray values to the inspection gray values (0 to 255).
The brightness in the camera gray values (in the range of 0 to
[Offset]) is regarded as 0 for the inspection gray value.
Set a larger value to inspect brighter part by limiting the brightness of
dark parts.
Offset setting range: 0 to 1000 (Initial value: 0)
[Indication of setting]
Specify the range that is not used for inspection.
To make the data for 5% of darker parts be 0, set 50.
(Value 1 is equivalent to 0.1%.)
Example) Even when the usage range is the same as shown in the above figure, change the offset
values when the upper and lower positions are different. For the left case in the figure, set the offset
value to 50 "not to use the upper and lower 5% of data". For the right case, set the offset value to 0 "to
use only the data for 90% of darker area".
The larger [Camera Gain] is set, the whole image will be brighter.
By setting [Offset], noises in the area that camera gray value is small can be removed. If it is set too large,
the camera gray value below the offset will be 0, and the image will blur from the darker part. Set the value
carefully checking the image.
Offset: Small Large
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