7.3. Obrobi

7.3.1. Pregled

Slika 17.140. Applying example for the Edge filter

Applying example for the Edge filter

Original image

Applying example for the Edge filter

After applying the filter (Sobel option)


Slika 17.141. Applying examples for the Edge filter

Applying examples for the Edge filter

After applying the filter (Prewitt compass option)

Applying examples for the Edge filter

After applying the filter (Gradient option)


Slika 17.142. Applying example for the Edge filter

Applying example for the Edge filter

After applying the filter (Roberts option)

Applying example for the Edge filter

After applying the filter (Differential option)


Slika 17.143. Applying example for the Edge filter

Applying example for the Edge filter

After applying the filter (Laplace option)


7.3.2. Aktiviranje filtra

You can find this filter through FiltersEdge-DetectEdge....

7.3.3. Možnosti

Slika 17.144. Edge filter options

Edge filter options

Algoritem

Edge detector offers several detection methods:

Sobel

Here, this method has no options and so is less interesting than the specific Sobel.

Prewittov kompas

Result doesn't look different from Sobel.

Preliv

Edges are thinner, less contrasted and more blurred than Sobel.

Roberts

No evident difference from Sobel.

Diferenčni

Edges less bright.

Laplace

Less interesting than the specific one.

Količina

A low value results in black, high-contrasted image with thin edges. A high value results in thick edges with low contrast and many colors in dark areas.

Wrap, Razmaži, Črna

Where the edge detector will get adjoining pixels for its calculations when it is working on the image boundaries. This option will only have an effect on the boundaries of the result (if any). Smear is the default and the best choice.