| Re: Image and ROI Help [message #50950] |
Fri, 27 October 2006 07:28  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Jimoid writes:
> My next stage is how to use the ROI data to select the region of the
> image. As I see it there are two possibilities:
>
> (i) a graphical approach where I turn the ROI data into a polygon and
> use it mask the image, or
> (ii) a computaional approach where I take the image data values and use
> the ROI coordiante data to calculate the image ROI information I need.
>
> My feeling is that the second approach would be better as it is more
> direct; the first approach uses an extra graphical step to arrive at
> the same result. What do others think?
>
> My second question is can anyone suggest methods for the second
> (computational) approach? I have been thinking that I could create an
> array filled with zeros the same size as my image, and use the ROI data
> to create an area within the array filled with ones and then multiply
> the two arrays. I am sure there must be better methods however.
I think I would put the ROI into an IDLanROI object,
and then just about everything you wanted to do with
an ROI would be sitting there in front of you. -)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Image and ROI Help [message #51126 is a reply to message #50950] |
Sat, 28 October 2006 08:33  |
Jimoid
Messages: 3
Registered: October 2006
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Junior Member |
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Thanks David and James, I'll try the IDLanROI approach.
Jimmy
On Oct 27, 3:28 pm, David Fanning <n...@dfanning.com> wrote:
> Jimoid writes:
>> My next stage is how to use the ROI data to select the region of the
>> image. As I see it there are two possibilities:
>
>> (i) a graphical approach where I turn the ROI data into a polygon and
>> use it mask the image, or
>> (ii) a computaional approach where I take the image data values and use
>> the ROI coordiante data to calculate the image ROI information I need.
>
>> My feeling is that the second approach would be better as it is more
>> direct; the first approach uses an extra graphical step to arrive at
>> the same result. What do others think?
>
>> My second question is can anyone suggest methods for the second
>> (computational) approach? I have been thinking that I could create an
>> array filled with zeros the same size as my image, and use the ROI data
>> to create an area within the array filled with ones and then multiply
>> the two arrays. I am sure there must be better methods however.I think I would put the ROI into an IDLanROI object,
> and then just about everything you wanted to do with
> an ROI would be sitting there in front of you. -)
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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