Rockwell Automation 5370-CBPK Color CVIM BLISTER-PAK Option - Manual (Page 56)

Chapter 6
Adjusting Blister Windows
6–14
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– White / + Black –– This function replaces a layer of white pixels at the
boundary between black and white objects with a layer of black pixels.
This function is a relatively coarse filter.
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+White / –Black –– This function replaces a layer of black pixels at the
boundary between black and white objects with a layer of white pixels.
This function is a relatively coarse filter.
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Triple Point –– This function is somewhat like an attenuated version of
the –White/+Black function, in that it replaces white pixels with black
pixels; its effect is less pronounced than the –White/+Black function.
This function is a relatively coarse filter, though not so much as the
–White/+Black function.
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–Isol (isolated) point –– This function removes all isolated, single white
pixels from the image. This function is a relatively fine filter.
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Smoothing –– This function is a relatively fine filter which eliminates
small, isolated groups of white or black pixels. This is the default
selection for the first filtering level.
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Pruning –– This function toggles a white pixel to black, if that white
pixel is connected to only one other white pixel. This function typically
removes, for example, a single white pixel from the end(s) of a string of
single, consecutive white pixels.
For most applications, the default filter settings will work well. Usually,
adjusting these filter settings should not be necessary except when the image
quality is poor, when compensation is required because of extraneous
reflections, or when inspecting tablets whose color is not well defined.
In all cases, your purpose in using these filter functions should be to optimize
the binary image and produce the most accurate and repeatable inspection
results.
Here are some general guidelines when using the Pixel/Obj Filter functions:
Numerical order of performance: Each selected filtering function is
performed in order by box number, and the selected filtering functions have a
cumulative effect on the binary image in the window. The desired overall,
top-to-bottom effect of these filtering functions is to filter out “noise” (see
Figure 6.13 on page 6–15) in the binary image to create consistent inspection
images, and to do so without substantially distorting the size or shape of the
image.
Use finer filter functions at first: Typically it is better to assign the
Smoothing , –Isol point , and Pruning filters to positions higher in the order
of performance than the coarser filters such as + White / – Black .
Use the – White / +Black and + White / – Black functions in tandem: For
best results, you will usually assign one + White / – Black function for
every – White / + Black function assigned, in order to minimize unwanted
alteration of the object size in the image.