Non-linear distance based filter

[Eduardo Henrique Arnold]

Yes, setting the vertical sampling value to a high value (i.e. 10000) did 
the trick. It makes sense since it is going to sample the the next pixel in 
a vertical position that does not exist in the image. With the right 
distance matrix I could use Josh's idea, as he suggested on the first 
reply. That was simpler than implementing something with several loops.

Thank you both, those were very quick and effective answers. :)

On Wednesday, July 16, 2014 1:16:34 AM UTC+1, Juan Nunez-Iglesias wrote:
>
> @JDWarner, actually, instead of iterating, setting one of the sampling 
> dimensions to a very large number should produce the desired output, no? =)
>
>
> On Tue, Jul 15, 2014 at 11:13 AM, Josh Warner <silvertr... at gmail.com 
> <javascript:>> wrote:
>
>> I don’t believe sampling works like this. The sampling= kwarg tells the 
>> algorithm the spacing of each pixel/voxel in each spatial dimension. It 
>> then calculates the distance transform. So if you put a zero in, it will 
>> traverse in that dimension with a distance cost of zero for each step. This 
>> will generate a result that has mostly spurious zero distances, rather than 
>> select a particular axis to calculate the distance transform along.
>>
>> To calculate the correct distance function along a specific axis probably 
>> requires repeated calls along that axis; since scipy.ndimage is by 
>> definition n-dimensional it should be able to efficiently handle rank-1 
>> arrays without issue.
>>
>> I use the super handy Chrome extension “Markdown Here” to write in 
>> Markdown and then have my free entry fields converted to pretty HTML prior 
>> to posting. At this point I pretty much think in Markdown…
>>
>> Josh
>>
>>   -- 
>> You received this message because you are subscribed to the Google Groups 
>> "scikit-image" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to scikit-image... at googlegroups.com <javascript:>.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/scikit-image/attachments/20140716/ab677835/attachment.html>