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Re: Three dimensional Polyfillv [message #58962 is a reply to message #58878]

Tue, 26 February 2008 17:58

twhaw
Messages: 5
Registered: February 2008

Junior Member

Dear all,

Thanks for your kind replies.

The reason why I can't use the 2D polyfillv is that the points are not
sampled as 2D slices in the rectangular coordinate system. Instead, it
is instead sampled in the spherical coordinate system (every 5 deg
longitudinally) and converted back to rectangular coordinates using
CV_COORD. I am sampling the blobs in the spherical coordinate system
so that I can get the same number of sample points regardless of the
size of the blobs (some are slightly small, some are slightly bigger).

I have checked out IDLanROI. It seems that we can defined a 3D ROI by
loading a (3, n) array. Maybe I can throw in my (3, n) array of sample
points and check whether a point in the 3D space is inside the ROI. In
this way, I might be able to get the points in the volume. But then
again, this method might be quite slow.

Many thanks again for your advices.

Cheers.

On Feb 27, 3:35 am, Mike <Michael.Mill...@gmail.com> wrote:
> What if you took your (3,n) values and, for each slice in your data
> volume, find the subset of the n points that fall on (or near enough
> to be considered "on") that slice? Then you could use polyfillv on
> that slice. I haven't done this with quite the data you have, but
> that is the method that I use to create 3D ROIs out of multiple 2D
> ROIs.
>
> Mike

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[Message index]

		Three dimensional Polyfillv By: twhaw on Mon, 18 February 2008 22:54
		Re: Three dimensional Polyfillv By: twhaw on Sun, 24 February 2008 18:21
		Re: Three dimensional Polyfillv By: Mike[2] on Tue, 26 February 2008 11:35
		Re: Three dimensional Polyfillv By: twhaw on Tue, 26 February 2008 17:58
		Re: Three dimensional Polyfillv By: David Fanning on Tue, 26 February 2008 04:46
		Re: Three dimensional Polyfillv By: Spon on Sat, 23 February 2008 04:11

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