road Extraction from image

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how can I Extract road from image ? i have take image from Google earth in that road is present .how can i separate that road or how can i display only road from that image? in java

Posted 20-Nov-13 3:36am

baliram bhande

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baliram bhande 20-Nov-13 9:46am

any open source API present in java.

Richard MacCutchan 20-Nov-13 10:03am

Did you ask Google?

baliram bhande 21-Nov-13 1:14am

i am asking general images .any image only thing is that road is present on that image. not specific to goggle

Richard MacCutchan 21-Nov-13 4:17am

And as I said you need to ask Google. You are asking how to analyse image data and select only certain parts based on shading colour etc. This is a vast subject and there is plenty of information around, but you need to go and look for it.

Pete O'Hanlon 20-Nov-13 11:26am

What, exactly, are you trying to accomplish by pulling out road information? As the image is going to be 2D, then you will be missing the fact that roads are actually 3D - this is a common mistake. What happens, for instance, if a road goes under a flyover (a common case). If you're trying, for instance, to roll your own routing algorithms, you need access to the underlying road data - this contains information such as road segments, speeds, etc...

baliram bhande 21-Nov-13 1:20am

please suggest me how can i do that.or any open source api present in java.

Richard MacCutchan 21-Nov-13 12:05pm

I have twice suggested what you need to do: go to Google and search for image processing. There is no simple way to do this, you need to study image processing and figure it out from the information you find.

Member 12352504 25-Feb-16 21:39pm

speech enhancement possible in.net?

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Bernhard Hiller · Accepted Answer · 2013-11-21T02:52:00

There are many problems with such an approach, as others pointed out in their comments.
But let's assume a simple case, with the road being pretty well visible and discernible on that image. It may have a color different from the colors of the areas next to it: so you could define a color (or more exactly: a range of colors) which mean "road". Now you iterate thru the image and check the color. If it fits, add the pixel's x and y values to a list. Next, look thru your list to find out which pixels are connected. And that's your road network then. Not a nice, "vectorized" network yet, but that could be done in the next steps.