Re: Edge filters

Hi,

> In soble we use first derivation and laplacian we use a second
> derivative
> Now what is the difference I get by using there two filter in the
> output

> When shall I use a sobel filter and when shall I use a lalacian filter

A Sobel filter has a direction sense like the first derivative: It detects
horizontal or vertical edges, depending on the filter. The laplacian
is a "scalar" second derivative, it is not direction sensitive.

So long,
Thomas

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