Cognex DataMan 300L, Краткое руководство пользователя

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By tuning, your DataMan 300 series reader automatically selects the best
settings for the given reading situation, based on parameters of illumination,
camera and decoder properties, and focal distance. Tuning autodisciminates all
enabled symbologies (both 1-D and 2-D). If multiple symbols are found in the
field of view, tuning locks on the first one found. Use this feature to create an
optimum setting to read your codes.
You can use any of the following methods to tune your reader:
• Press the Tune button at least for 3
seconds on your reader. The first press
starts the tuning, and the second
press cancels the tuning, if it is still
ongoing.
• Turn on tuning in the
Setup Tool.
• Start tuning by sending a DMCC, for more information, see the Command
Reference , available through the Windows Start menu or the Setup Tool
Help menu.
• Use Input line 1 for tuning. Go to the
Setup Tool’s System Settings pane and
check Tune . You can also use the In1
button on the toolbar.
You can define a stack of filters to be applied to each image acquired
by your DataMan 300 series reader. You can select the following filters
on the Setup Tool’s Image Filtering pane (under Light and Imager
Settings):
• Equalize
This filter redistributes the brightness values of the pixels in the image.
As a result, the range of brightness levels are more evenly represented.
Use this filter if you have too dark or too bright images.
• Stretch
This filter linearly scales up or stretches the greyscale values in the input
image to the full 256-step greyscale. The result is an output image with
increased contrast.
• Low Pass
Using this filter results in output images where edges are smoothed or
blurred.
• Dilate
This filter increases bright features and shrinks dark features. The result
is an output image with larger areas of bright pixels. Use this filter to
remove dark specks.
• Erode
This filter shrinks bright features and increases dark features. The result
is an output image with larger areas of dark pixels. Use this filter to
remove light specks.
• Open
This filter performs an erosion followed by a dilation to filter out bright
features that are smaller than the size of the processing neighborhood.
The result is an output image with slightly decreased overall brightness.
64 DataMan 300 Quick Reference Guide DataMan 300 Quick Reference Guide 65
DataMan 300 Series Tuning
DataMan 300 Series Image Filtering