HDevelop User's Manual

2.3. MAIN WINDOW 43
ËÙ×ØÓÒ× º ÈÖ××ÓÖ
Many operators require a reasonable or necessary predecessor operator. For example before
computing junction points in a skeleton (ÙÒØÓÒ× ×ÐØÓÒ), you have to compute
this skeleton itself (×ÐØÓÒ). To obtain a threshold image you have to use a lowpass
filter before executing a dynamic threshold (ÝÒ ØÖ×ÓÐ). Using the watershed
algorithms (ÛØÖ××), it is reasonable to apply a smoothing filter on an image first,
because this reduces runtime considerably.
ËÙ×ØÓÒ× º ËÙ××ÓÖ
In many cases the task results in a “natural” sequence of operators. Thus as a rule you
use a thresholding after executing an edge filter or you execute a region processing (e.g.,
morphological operators) after a segmentation. To facilitate a reasonable processing all
the possible operators are offered in this menu item.
ËÙ×ØÓÒ× º ÐØÖÒØÚ×
Since HALCON includes a large library, this menu item suggests alternative operators.
Thus, you may, for example, replace ÑÒ Ñ with operators such as Ù×× Ñ,
×Ñ Ñ, or×ÑÓÓØ Ñ.
ËÙ×ØÓÒ× º Ë Ð×Ó
Contrary to ÐØÖÒØÚ×, operators are offered here which have some connection to
the current operator. Thus, the median filter (ÑÒ Ñ) is not a direct alternative to
the mean filter (ÑÒ Ñ). Similarly, the regiongrowing operator (ÖÓÒÖÓÛÒ)is
no alternative for a thresholding. In any case, they offer another approach to solve a task.
References might consist of pure informative nature, too: the operator Ò ÐÓÛÔ××,
which is used to create a lowpass filter in the frequency domain, is a reasonable reference
to a Gaussian filter.
ËÙ×ØÓÒ× º ÃÝÛÓÖ×
This menu item gives access to HALCON operators by using keywords which are associated
with each operator. You get a window, divided into two parts, which contains all
keywords on the left hand side and the selected operators on the right (see figure 2.27).
Figure 2.27: Operator suggestions according to keyword “Clipping”.
HALCON 6.0