HDevelop User's Manual

1.3. ADDITIONAL SOURCES OF INFORMATION 7
Figure 1.4: Region selection based on shape features.
field ØÙÖ× to specify the value ÓÑÔØÒ××. As a range of values you may specify
the parameters ÅÒ and ÅÜ with the values ½¼ and ½, respectively. The output regions
of the first call (ËÐØÊÓÒ×) are the input regions for the second call of operator
×ÐØ ×Ô. The output parameter’s name ËÐØÊÓÒ× is replaced by the name
ËÐØÊÓÒ×ÝÒÌÖ×.
The last step to make the application stable is to add a selection of regions based on gray value
features. This is done by using the operator ×ÐØ ÖÝ. In this case, the mean gray value is
used to discriminate the objects.
Finally, we want to obtain some numerical information about the matched marks. For example,
we might want to compute three shape features of the marks. They are derived from the regions’
geometric moments. The calculation is done by the operator ÒØÖØÝ. The input parameters
are all regions of the variable ÅÖ×. The computed values Ò×ÓÑØÖÝ, ÙÐÒ××, and
ËØÖÙØÙÖØÓÖ are displayed as a list (a tuple in HALCON terminology) in the variable
window. Figure 1.5 shows the example session’s result.
As you can see in figure 1.5 and 1.4 it is possible to combine the two successive calls of
×ÐØ ×Ô into one call. This reduces the length of the program and saves runtime.
1.3 Additional Sources of Information
Further information can be found in the following manuals:
¯ Getting Started with HALCON
An introduction to HALCON in general, including how to install and configure HALCON.
HALCON 6.0