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Thread Subject: help selecting data within a region of interest (ROI)

Subject: help selecting data within a region of interest (ROI)

From: Steve

Date: 19 Dec, 2007 00:44:50

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I frequently use tools such as ginput and roipoly to allow users to
interface with data when the data is in an image format. I now have a
LIST of x,y coordinates defining points in a plane (not regularly
spaced) that I plot using the plot command. Is there a simple way to
do something like an roipoly to select all the points in a defined
region when the data is in a format like this (and is not simply an
image)? Right now I am interpolating my points to a regular grid,
then using roipoly, then selecting those points that fall within the
ROI mask, but I am guessing that there is a better way...
Thanks.
v/r
Steve

Subject: help selecting data within a region of interest (ROI)

From: Steve

Date: 19 Dec, 2007 00:51:21

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oops - double post (sorry)

Subject: help selecting data within a region of interest (ROI)

From: Bob

Date: 19 Dec, 2007 15:48:21

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Is CONVHULL any help?

Subject: help selecting data within a region of interest (ROI)

From: matt dash

Date: 19 Dec, 2007 20:05:40

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Check out the inpolygon function. If you want it to be
interactive, try this:

http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=13857&objectType=file

Subject: help selecting data within a region of interest (ROI)

From: Bruno Luong

Date: 19 Dec, 2007 20:25:37

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Right, such as the code in this thread:
http://www.mathworks.com/matlabcentral/newsreader/view_thread/160878#406188

Bruno

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