Algorithm to 'walk' along a line from an endpoint by N pixels

[Robin Wilson]

Hi all,

Thanks for the responses.

Stefan - that is a lovely idea which I started to work with, but then
realised that if my line is curved (for example, U shaped) then the
distance transform will give smaller distances to some of the points than
should be given: eg. starting at the top of the U on the left, the top of
the U on the right would have a lower distance to the starting point than
one of the pixels at the bottom of the U).

Jean-Pat - your code looks very similar to the code I've started to write.
I'll probably take some of your ideas and merge them into my code, if
that's ok.

Thanks,

Robin


On Sat, Jun 29, 2013 at 1:15 PM, Jean-Patrick Pommier <
jeanpatrick.pommier at gmail.com> wrote:

> Hi,
> This is not advertizing for my blog, but I faced the same kind of question
> here<http://dip4fish.blogspot.fr/2011/06/open-curve-to-ordered-pixels-second.html>.
> The idea would be first to convert the image of the curve into a set of
> ordered pixels, then counting pixels from that list is easy.
>
> jean-pat
>
> Le vendredi 28 juin 2013 18:04:52 UTC+2, Robin Wilson a écrit :
>
>> Hi,
>>
>> Does anyone know if an algorithm to take an endpoint of a binary line in
>> an image and 'walk' back along the line for N pixels already exists in
>> skimage? (or in any of the related projects). I'm happy to go ahead and
>> implement it, but it seems like the kind of thing that would have already
>> been implemented, even though I can't find it in the documentation.
>>
>> Does this already exist?
>>
>> Cheers,
>>
>> Robin
>>
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