DataMan 370 Series Image Filtering
You can define a stack of filters to be applied to each image acquired by your DataMan 370 series reader. To select the
following filters in DataMan Setup Tool, click the
Optimize Image
pane, select the
Advanced
tab, click the triangle next
to
Image filtering
, click "
...
" next to No Filtering for more options, then click the
Add
button.
l
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.
l
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.
l
Low Pass
Using this filter results in output images where edges are smoothed or blurred.
l
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.
l
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.
l
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.
l
Close
This filter performs a dilation followed by an erosion to filter out dark features that are smaller than the size of the
processing neighborhood. The result is an output image with slightly increased overall brightness.
l
Auto Stretch
This filter reduces the pixel value range. It maps the pixel values from 0 to 255.
l
Optical Density
This filter specifies an inversion of pixel values based on a logarithmic scale. The result is an output image that
reveals the density of objects and features in the input image by measuring the amount of light that passes
through them. Denser objects and features are represented by lighter pixels in the output image.
l
Invert
This filter specifies an inversion of pixel values based on the 256-step greyscale. The result is an output image
that is a “negative” of the input image.
To use Image Filtering, perform the following steps:
1. On the Image Filtering pane, click
Add
.
2. Select a filter from the
Filter Properties
drop-down box. You can add more than one filter. You can also specify
the order in which filtering is done by moving the filters using the
Up
and
Down
buttons.
3. If the filter you selected require further settings, change properties according to your needs.
4. Change the selection in the
Image to Use
group box according to the symbology you want to be filtered (after
making sure that that Symbology is enabled):
If no image is read, the Results Display shows the image according to your selection under No-Read Image.
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Using Your DataMan 370 Reader
