<div dir="ltr"><img width="0" height="0" class="mailtrack-img" style="float:right;" alt="" src="https://mailtrack.io/trace/mail/0987c4b08dd9b39b0e448ca76336586c908772d1.png?u=533594">Thanks, Jorge,<div>For your valuable reply. Can you suggest some algorithm that I can start implementing as I have some basic knowledge of OpenCV.</div><div><br></div><div>Awaiting for your positive response.</div><div><br></div><div>Thanks & Regards,</div><div>Harsh<br><br><br><br><div class="mt-signature">
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</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Apr 13, 2017 at 1:18 PM, Jorge Gustavo Rocha <span dir="ltr"><<a href="mailto:jgr@di.uminho.pt" target="_blank">jgr@di.uminho.pt</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Sai Harsh,<br>
<br>
I would start by learning OpenCV [1]. OpenCV is a sophisticated image<br>
processing library with Python bindings you can use with QGIS. You can<br>
write your own algorithm to isolate the roads. Search the web for object<br>
detection and classification examples.<br>
Machine learning is probably the best approach. You have already images<br>
with roads, so you have many examples for machine learning (positive<br>
cases). So, after playing with OpenCV, look for machine learning (with<br>
OpenCV).<br>
<br>
Regards,<br>
<br>
Jorge Gustavo<br>
<br>
[1] <a href="http://opencv.org/" rel="noreferrer" target="_blank">http://opencv.org/</a><br>
<span class=""><br>
Às 06:58 de 13-04-2017, Sai Harsh Tondomker escreveu:<br>
> Dear All,<br>
> I am Sai Harsh, an UG student in IIIT-Chittoor, India.<br>
><br>
> I want to convert raster image to vector shape layer. I knew that in<br>
> qgis this feature already exists but it's limited.<br>
><br>
> Let us suppose If one google roadmap image is given as an input, after<br>
> converting it into vector shape layer(using the existing conversion), I<br>
> would like to highlight one road line(manually using attribute table)<br>
> but it's not working. correct me if I am wrong.<br>
><br>
> Can anyone suggest me how I need to proceed?<br>
><br>
> I know there should be some image processing algorithm need to be<br>
> applied, then followed by converting it into vector layer format.<br>
><br>
> Which image processing algorithm I need to apply to get good accuracy?<br>
><br>
> Awaiting for a positive response.<br>
><br>
> Best Regards,<br>
> Harsh<br>
> IIIT-Chittoor<br>
><br>
><br>
><br>
><br>
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<br>
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--<br>
Jorge Gustavo Rocha<br>
Departamento de Informática<br>
Universidade do Minho<br>
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