8.3. Hrana
| 8. Filtry detekce hran |

### 8.3. Hrana

#### 8.3.1. Activating the Filter

This filter is found in the main menu under Filters → Edge-Detect → Edge….

#### 8.3.2. Options

Obrázek 17.166. Edge filter options

Presets, „Input Type“, Clipping, Blending Options, Preview, Merge filter, Split view

  | Poznámka
  These options are described in 2 – „Common Features“.

Algorithm

  Detektor hran může využívat řadu různých detekčních algoritmů:

  Sobelova metoda

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

    After applying the filter (Sobel option)

  Prewittův kompas

    Result doesn't look different from Sobel.

    After applying the filter (Prewitt compass option)

  Gradient

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

    After applying the filter (Gradient option)

  Robertsův

    No evident difference from Sobel.

    After applying the filter (Roberts option)

  Hrana

    Edges less bright.

    After applying the filter (Differential option)

  Laplaceova metoda

    Less interesting than the specific one.

    After applying the filter (Laplace option)

Míra

  Nízká hodnota znamená černý, vysoce kontrastní výsledek s tenkými hranami. Vysoká hodnota znamená silnější hrany, méně kontrastu a mnoho barev ve tmavých oblastech.

Border behavior

  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). Clamp is the default and the best choice.

8.2. Rozdíl gaussovských rozostření |  | 8.4. Laplaceova metoda

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