User guide

Quantity One User Guide
13-12
If you select Rolling Disk, the dialog box will expand to reveal a field showing
the size of the rolling disk. The Disk Size is the disk radius in pixels.
You can type in a numerical value for the disk size or you can use the arrows
to change the value in 10 percent increments.
A disk radius that is too large will result in slow execution and poor removal
of background. A disk radius that is too small may subtract nonbackground
intensity. Typical values range from 50 to 150.
Fig. 13-11. Examples of the background trace for small and large rolling disks. The small
disk follows the profile trace more closely, resulting in more background subtraction.
Try different disk sizes to find the one that gives you the desired background
noise trace.
When you apply the Rolling Disk background subtraction, the lane trace
display will change but the image will not reflect the change in background
intensity.
Small Radius Large Radius