### 8.2. Gaussiaanse verschillen

#### 8.2.1. Overzicht

Afbeelding 17.169. Voorbeeld van toepassen van het filter “Gaussiaanse verschillen”

Originele afbeelding

Filter “Gaussiaanse verschillen” toegepast met straal 1 = 1,000 en straal 2 = 0,100.

This filter does edge detection using the so-called “Difference of Gaussians” algorithm, which works by performing two different Gaussian blurs on the image, with a different blurring radius for each, and subtracting them to yield the result.

This algorithm is very widely used in artificial vision, and is pretty fast because there are very efficient methods for doing Gaussian blurs.

#### 8.2.2. Activeren van het filter

Dit filter is te vinden in het hoofdmenu onder Filters → Randen → Gaussiaanse verschillen….

#### 8.2.3. Opties

Afbeelding 17.170. Opties filter Gaussiaanse verschillen

Voorinstellingen, “Type invoer”, Snijden, Mengopties, Voorbeeld, Filter samenvoegen, Voor/na

  | Opmerking
  Deze opties staan beschreven in Paragraaf 2, “Algemene eigenschappen”.

Straal 1, Straal 2

  Radius 1 and Radius 2 are the blurring radii for the two Gaussian blurs. Increasing “Radius 1” tends to give thicker-appearing edges, and decreasing the “Radius 2” tends to increase the “threshold” for recognizing something as an edge.

  If you want to produce something that looks like a sketch, in most cases setting “Radius 2” smaller than “Radius 1” will give better results.

  In situations where you have a light figure on the dark background, reversing them may actually improve the result.

8. Filters Randen |  | 8.3. Rand

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