[Qgis-developer] Raster to Vector conversion

[Sai Harsh Tondomker]

Thanks, Jorge,
For your valuable reply. Can you suggest some algorithm that I can start
implementing as I have some basic knowledge of OpenCV.

Awaiting for your positive response.

Thanks & Regards,
Harsh



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On Thu, Apr 13, 2017 at 1:18 PM, Jorge Gustavo Rocha <jgr at di.uminho.pt>
wrote:

> Hi Sai Harsh,
>
> I would start by learning OpenCV [1]. OpenCV is a sophisticated image
> processing library with Python bindings you can use with QGIS. You can
> write your own algorithm to isolate the roads. Search the web for object
> detection and classification examples.
> Machine learning is probably the best approach. You have already images
> with roads, so you have many examples for machine learning (positive
> cases). So, after playing with OpenCV, look for machine learning (with
> OpenCV).
>
> Regards,
>
> Jorge Gustavo
>
> [1] http://opencv.org/
>
> Às 06:58 de 13-04-2017, Sai Harsh Tondomker escreveu:
> > Dear All,
> > I am Sai Harsh, an UG student in IIIT-Chittoor, India.
> >
> > I want to convert raster image to vector shape layer. I knew that in
> > qgis this feature already exists but it's limited.
> >
> > Let us suppose If one google roadmap image is given as an input, after
> > converting it into vector shape layer(using the existing conversion), I
> > would like to highlight one road line(manually using attribute table)
> > but it's not working. correct me if I am wrong.
> >
> > Can anyone suggest me how I need to proceed?
> >
> > I know there should be some image processing algorithm need to be
> > applied, then followed by converting it into vector layer format.
> >
> > Which image processing algorithm I need to apply to get good accuracy?
> >
> > Awaiting for a positive response.
> >
> > Best Regards,
> > Harsh
> > IIIT-Chittoor
> >
> >
> >
> >
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> >
> > <#>
> >
> >
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>
> J. Gustavo
> --
> Jorge Gustavo Rocha
> Departamento de Informática
> Universidade do Minho
> 4710-057 Braga
> Tel: +351 253604480
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