in the Filter dialog box, by selecting Create Filter command from the File menu of the Main window, or by double-clicking the NewFilter item in the Operation-list or the Operation-list. Besides using the ILWIS standard filters, you can:
Creating linear filters:
You can create, edit and store your own linear filters, for example for example by clicking the create button in the Filter dialog box, by selecting Create Filter command from the File menu of the Main window, or by double-clicking the NewFilter item in the Operation-list or the Operation-list.
You can specify the size of the linear filter, insert your own values in the matrix and specify a gain factor. For more information, refer to the Create Filter dialog box and the Filter editor.
Defining a filter in the Filter dialog box:
In the Filter dialog box, you can select any standard (predefined) filter.
Furthermore, you can define the following filters according to your wishes: Average filter, Rank Order filter, Median filter, Majority filter, Pattern filter, and Standard Deviation filter. You can specify the filter size, a rank or the threshold.
Defining a filter by an expression on the command line:
Finally, advanced users can define an Average filter, a Rank Order filter, a Median filter, a Majority filter, a Pattern filter, a Standard Deviation filter or even a Linear filter by typing an expression on the command line of the Main window.
Detailed information and examples:
The following topics describe all possibilities of user-defined filters and also provide you with some examples:
See also: