| 9.3. Distance Map | ||
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9. Filters Algemeen |  |
| 9.3. Distance Map | ||
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9. Filters Algemeen | |
Each pixel in the image is replaced with a gray value dependent on the distance to the nearest obstacle pixel, generally a boundary pixel. Different methods can be used to calculate the distance.
![[Opmerking]](images/note.png)
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Opmerking |
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Deze opties staan beschreven in Paragraaf 2, “Algemene Eigenschappen”. |
“Metric” is a topology term. Three methods are available:
Euclidean default: the distance is a line.
Manhattan: the distance is the sum of the one-dimensional distances along the X and Y axes.
Chebyshev: the distance is the maximum of the one-dimensional distances along the X and Y axes.
Default is 0. Increasing this value selects higher lightness pixels
Original image for examples. Threshold low will be progressively increased. Lightness: dark red = 0.070; bright red = 0.223; green = 0.133
Afbeelding 17.173. “Threshold low” example
Threshold low = 0: only border distances are visible.
Threshold low = 0.070: “dark red” circle appears.
Threshold low = 0.133: “green” circle appears.
Threshold low = 0.223: “bright red” circle appears.
Default is 1. Decreasing this value makes result darker.
Number of computations for grayscale averaging.
This option is checked by default. If you uncheck it, no blur is created.
Het resultaat van dit filter kan groter zijn dan de oorspronkelijke afbeelding. Met de standaardoptie Adjust wordt de grootte van de laag automatisch aangepast wanneer het filter wordt toegepast. Met de optie Clip wordt het resultaat bijgesneden tot de laaggrens.
