If your image data exceeds 8 bits, it might be useful to
choose a minimum and maximum gray value and change the mode that handles
the expected gray-value range.
On the Input tab, there are three modes available that allow you to control how much adaption of
the program to gray-value ranges is necessary:
- The default mode is the adaptive mode, which
checks the gray values of an image and automatically
adapts these values for each image. This mode is useful if the gray-value
range is unknown or differs between images. The downside to this default
setting is, that the highest value might differ from
image to image which results in the fact that also the curves in the graphs
that define the edges appear shifted which can be confusing.
- The increasing mode checks the values for the
first image and keeps these values if the gray-value range
of the following images is either
the same or smaller. It only corrects the values
for a wider range which is only a problem if values should
be adapted for an image with data that is significantly smaller than
the one of the previous images and the values on the graph are therefore
so close together that it is impossible to distinguish the edges.
- The simplest mode is the fixed mode as
it uses only the gray-value range that has been
entered and does not adapt any values. This mode is a good choice if
it is known that all images have the same gray-value range or deviations do not contain
necessary information in those values that exceed the given gray-value range
so that their variation of range can be disregarded. You can check your
camera to see if 10, 12 or 14 bits are used and choose your values accordingly.
Depending on the mode you have chosen, the
minimum and maximum values will differ. The
gray-value range that is chosen here directly affects the Min. Edge Amplitude as well
the graphs on the Fuzzy tab.
The Reset button allows you to set the values back
to their default.
If you are not finished with your Input yet, proceed to either add
calibration images or perform a calibration, respectively, if you want to transform
your results in to world coordinates, or continue to create an ROI and
then step to the next tab to extract edges.