Which method can we use to connect a skeleton road ?

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mika 2014-4-16

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编辑： mika 2014-4-21

I'm trying to determine all the possible paths to matches extremities of those curves (Road following)and choosing paths which verify a configuration like X, Y, T, _, and L in order to connect them(red curve) in a road skeleton not connected (white curve) like the example below :

I detected feature points like the picture below

but i'm stuck i don't know what approach use to do it because it requires a dynamique way .

i have to use a dynamic research window to determine the curve shape(configuration like X, Y, T, _, and L) that will complete the road network.

Any ideas please! Help is much appreciated

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Answer 1

Image Analyst 2014-4-16

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I'm not sure what you're asking or how to answer. With the bwmorph() function you can find endpoints and branchpoints (the red * in your images). Any branchpoint can be checked out to see what it is. There are 256 possible combinations of the 8 surrounding pixels and there may be certain patterns that define each. Then you can make a look up table, like if it's

[0, 1, 0; 
 1, 1, 1;
 0, 1, 1]

it's an "X".

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Image Analyst 2014-4-18

What do you mean by "connect" and what are "the red curves"? I don't see any red curves, just a set of isolated (x,y) coordinates where you placed a *. And like I said, you can construct a lookup table based on the pattern of the surrounding 8 pixels to determine if it's an X, a Y, etc.

mika 2014-4-21

编辑：mika 2014-4-21

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I'm talking about red curves mentioned in the image below that it's expected to be the result i'm looking for taking for example the L pattern mentioned by the blue circle

 can you explain a little bit how i can use a look up table because no idea about it and i don't know if it can be extended in a way to recover the more important feature points to give the right pattern.

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