Blob detection and size measurement in Julia?

[Alex Mellnik]

Hi,

I'm attempting to measure the size and position of roughly spherical, well-defined objects in images using Julia.  I don't have any previous experience working with images and was wondering if anyone could point me toward the appropriate library/function.  

I know that there's a blob_LoG in Images.jl which appears to do roughly what I'm interested in, but I may be mistaken and it looks my images will need pre-processing as I haven't yet been able to get a non-null result.  There's also the new ImageFeatures.jl and bindings for OpenCV, but neither have much in the way of documentation yet. 

Thanks for any suggestions you can provide,

Alex

[Tim Holy]

Good catch. Looks like the edge-handling in `findlocalmaxima` needed to be a
bit more refined---it was discarding results from the first and last sigma-
values supplied by the user.

I may have fixed this in https://github.com/timholy/Images.jl/commit/
7336f35c824b15de9e4d0def8e739bdeb6ed3b3d, can you do `Pkg.checkout("Images")`
and test?

Best,
--Tim

On Friday, August 26, 2016 8:11:44 PM CDT Alex Mellnik wrote:
> Hi,
>
> I'm attempting to measure the size and position of roughly spherical,
> well-defined objects in images using Julia. I don't have any previous
> experience working with images and was wondering if anyone could point me
> toward the appropriate library/function.
>
> I know that there's a blob_LoG

> <http://timholy.github.io/Images.jl/stable/function_reference/#Images.blob_L
> oG> in Images.jl which appears to do roughly what I'm interested in, but I

[Alex Mellnik]

Hi Tim,

Thanks for the update.  After pulling the master I was able to detect some blobs depending on what I used for the sigmas.  However, I realized the problem of actually tracking the areas of the blobs between frames was quite a bit more complicated than I originally thought, and I've punted it back to my brother.  Best,

Alex