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Re: Subset Image [message #45457]

Fri, 16 September 2005 10:29

Julio[1]
Messages: 52
Registered: May 2005

Member

Hi,

I want to subset the image using ROIs. I can't use SUB_RECT because I
don't know the limits (columns, rows) of each subset (it is specified
by ROIs).
Thanks at any rate,
Julio

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Re: Subset Image [message #45467 is a reply to message #45457]

Fri, 16 September 2005 05:08

steffenfr
Messages: 3
Registered: September 2005

Junior Member

Hi! when you read a file in e.g. a tiff: READ_TIFF( ) it has a keyword
SUB_RECT, with that you can specify a subset, not sure if this is what
you need...

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Re: Subset Image [message #45638 is a reply to message #45457]

Fri, 16 September 2005 18:32

Jeff N.
Messages: 120
Registered: April 2005

Senior Member

The 'subset via ROI' function in ENVI sets every pixel outside of the
ROI to zero right? There are actually lots of ways to do this with
IDL. The answer really depends on your ROI. If your ROI is
rectangular, you can do it with array subscripting. If your ROI is an
irregular shape, you would probably use the WHERE() function. Are you
planning to draw the ROI's with IDL too? If so, you might try XROI.

Jeff

Julio wrote:
> Hi,
>
> I want to subset the image using ROIs. I can't use SUB_RECT because I
> don't know the limits (columns, rows) of each subset (it is specified
> by ROIs).
> Thanks at any rate,
> Julio

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