Specifications
• Close
This lter performs a dilation followed by an erosion to lter out dark features
that are smaller than the size of the processing neighborhood. The result is an
output image with slightly increased overall brightness.
• Auto Stretch
This lter reduces the pixel value range. It maps the pixel values from 0 to
255.
• Optical Density
This lter species 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.
• Invert
This lter species 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 lter from the Filter Properties drop-down box. You can add more
than one lter. You can also specify the order in which ltering is done by
moving the lters using the Up and Down buttons.
3. If the lter 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 ltered (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.
50 DataMan 300 Quick Reference Guide DataMan 300 Quick Reference Guide 51
DataMan 300 Series Image Filtering (Continued)