[GRASS-dev] how difficult would it be to modify i.edge to not load the entire image into memory ?

[Moritz Lennert]

On 14/12/17 05:45, Vaclav Petras wrote:
> Hi Moritz,
> 
> I'm currently at AGU 

Enjoy ! :-)

> and can't dig into the code, but yes, I think it 
> can be rewritten with segment library, preferably with MarkusM's 
> "segment or in-memory" wrapper.

Great ! Markus, is this wrapper in the library, or just in existing 
modules ? I know the version in the i.superpixels.slic addon and have 
some memory of you implementing it elsewhere.

Moritz



> 
> Vaclav
> 
> On Tue, Dec 12, 2017 at 10:51 AM, Moritz Lennert 
> <mlennert at club.worldonline.be <mailto:mlennert at club.worldonline.be>> wrote:
> 
>     Hi Anna, Hi Vaclav,
> 
>     I would love to use the i.edge module. However, the fact that it
>     reads everything into memory obviously limits its use either to
>     small images, or to tiled versions of larger images.
> 
>     I have just rapidly looked at the code, but I cannot really detect
>     any place where you really need the entire image, or ? The Gaussian
>     filter could be cut off at a certain distance and the actual Canny
>     detector is also based on a kernel, AFAICT. So, do you think this
>     could be rewritten to use the SEGMENT library and at all times only
>     load necessary parts of the image into memory ?
> 
>     Moritz
> 
>