Difference between the option 'log' and 'zerocross' of function edge?
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Hi,
I use the Matlab function edge and I want to know the differences between the option 'log' and 'zerocross' when I use for 'zerocross' the default filter? (BW=edge(I,'log'); BW=edge(I,'zerocross');)
I think the default filter of the option 'zerocross' is 'log'. Are the results the same or are there differences in the calculation of the edges?
Thanks!
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Anand
2014-9-29
The 'log' method is a specific type of zero-crossing edge detector, where the image is filtered with the Laplacian of Gaussian filter obtained as follows:
>> fspecial('log')
ans =
0.0448 0.0468 0.0564 0.0468 0.0448
0.0468 0.3167 0.7146 0.3167 0.0468
0.0564 0.7146 -4.9048 0.7146 0.0564
0.0468 0.3167 0.7146 0.3167 0.0468
0.0448 0.0468 0.0564 0.0468 0.0448
BW = edge(I,'zerocross',THRESH,H)
If you do not provide a zero crossing filter kernel H, the Laplacian of Gaussian kernel is used by default. This is why 'zerocross' and 'log' methods will give the same result if you do not specify a filter kernel.
2 个评论
Nina
2014-9-29
Sarah Agnalt
2016-8-11
What zero crossing filters H are there? Like what other inputs can I use in a zerocross edge detection?
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