Difference between the option 'log' and 'zerocross' of function edge?
5 次查看(过去 30 天)
显示 更早的评论
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!
0 个评论
采纳的回答
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
Sarah Agnalt
2016-8-11
What zero crossing filters H are there? Like what other inputs can I use in a zerocross edge detection?
更多回答(0 个)
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!