Spatial Filter

Use the Draw | Image | Filters | Spatial command to access the Apply Spatial Filter dialog. There are 17 spatial filters to choose from in MapViewer. Spatial filters help to accentuate the appearance of an image. The filters can bring out the spatial details that might be required to digitize objects from an image.

Apply Spatial Filter Dialog:

Change filter types and preview their effects in the

Apply Spatial Filter dialog.

To view the effects of a filter, choose a filter and then click the Apply button. To return to the original image state, click the Reset button.

Available filters:

Laplacian Omnidirectional Filter 1

Laplacian Omnidirectional Filter 2

Laplacian Omnidirectional Filter 3

Laplacian Diagonal

Laplacian Horizontal

Laplacian Vertical

Sobel Horizontal

Sobel Vertical

Prewitt Horizontal

Prewitt Vertical

Shift-Difference Diagonal

Shift-Difference Horizontal

Shift-Difference Vertical

Line Segment Horizontal

Line Segment Vertical

Line Segment L-R

Line Segment R-L

For more information on the filters listed above, refer to the following references or any other imaging reference.

Baxes, Gregory A., (1994), Digital Image Processing: Principles and Applications, John Wiley and Sons, Inc., New York, 480 pp.

Crane, Randy, (1996), A Simplified Approach to Image Processing: Classic and Modern Techniques in C, Prentice Hall, 336 pp.