DataMan 360 Series Image Filtering

You can define a stack of filters to be applied to each image acquired by your DataMan 360 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.

  • 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.

  • 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.

  • Auto Stretch

    This filter reduces the pixel value range. It maps the pixel values from 0 to 255.

  • 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.

  • 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):

    5. If no image is read, the Results Display shows the image according to your selection under No-Read Image.

  5. Go to the Displayed Image Settings pane and change the Images to Use according to what you want to see on Live Display: the original or the filtered image.
  6. You can compare the original and filtered results on the Results Display if you choose the images from the Read Result History.

    The example images were taken using the Equalize filter.