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Re: Filling a contour [message #60721 is a reply to message #60716]

Sat, 07 June 2008 06:19

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

> I have created a single contour and converted it into a 'contour
> image'. That is to say that I have created an N x M image array and
> populated it with 0's and placed a 1 where a contour point resides. I
> would like to be able to fill the interior of the contour with 1's.
> Any ideas? Thanks

If the contour is closed in the image, then an interior point is
defined as having an odd number of contour crossings to the edge in
each direction. So I would create a new NxM array of "number of
contour crossings between x=0 and this point" and the same for y
(which, since everything is either 0 or 1, is simply the cumulative
sum). Then test for positions where both of these are odd and set
those to 1.

xcrossings = total(contour_image, 1, /cumulative)
ycrossings = total(contour_image, 2, /cumulative)
interior = where(xcrossings mod 2 and ycrossings mod 2, ninterior)
if ninterior gt 0 then contour_image[interior]=1

-Jeremy.

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[Message index]

		Re: Filling a contour By: Robbie on Wed, 11 June 2008 19:00
		Re: Filling a contour By: Loren Anderson on Wed, 11 June 2008 18:02
		Re: Filling a contour By: Jye on Wed, 11 June 2008 16:32
		Re: Filling a contour By: Jeremy Bailin on Sun, 08 June 2008 09:59
		Re: Filling a contour By: Jeremy Bailin on Sat, 07 June 2008 06:19

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