Free rotation of selection (ROI)

[Jacqueline Ross]

Dear list members,

I know how to rotate a rectangular selection in ImageJ (Edit - Selection - Rotate) if I know what angle I need.

However, I'd like to be able to do a free rotation of the selection in the same way as I can do a rotation of the entire image (Image - Transform - Rotate), i.e. with a Preview option so that you can adjust the angle until it's correct.

Does anyone know how this can be implemented?

The reason for the query is that I am helping a graduate student who needs to align the selection tangentially to an image of the knee joint. The only other way to do it is to rotate the image but this seems a bit clumsy and I'd prefer not to be altering the pixels.

Looking forward to hearing your ideas!

Kind regards,

Jacqui

Jacqueline Ross
Biomedical Imaging Microscopist
Biomedical Imaging Research Unit
School of Medical Sciences
Faculty of Medical & Health Sciences
The University of Auckland
Private Bag 92019
Auckland 1142, NEW ZEALAND

Tel: [phone]
Fax: [phone]

http://www.fmhs.auckland.ac.nz/sms/biru/


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[Rasband, Wayne (NIH/NIMH) [E]]

> On Nov 2, 2015, at 10:54 PM, Jacqui Ross <[hidden email]> wrote:
>
> Dear list members,
>
> I know how to rotate a rectangular selection in ImageJ (Edit - Selection - Rotate) if I know what angle I need.
>
> However, I'd like to be able to do a free rotation of the selection in the same way as I can do a rotation of the entire image (Image - Transform - Rotate), i.e. with a Preview option so that you can adjust the angle until it's correct.
>
> Does anyone know how this can be implemented?
>
> The reason for the query is that I am helping a graduate student who needs to align the selection tangentially to an image of the knee joint. The only other way to do it is to rotate the image but this seems a bit clumsy and I'd prefer not to be altering the pixels.

You can interactively rotate selections using the “Selection Rotator” tool, contributed by Peter Haub, which is included with ImageJ 1.50d. To add this tool to the toolbar, select it from the toolbar’s “>>” menu.

-wayne



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ImageJ mailing list: http://imagej.nih.gov/ij/list.html

[Jacqueline Ross]

Hi Wayne,

Thanks very much for your swift reply. Thank you Peter Haub for seeing the need for this tool and implementing it. It's just what we need.

Looks like my query was just at the right time!

Cheers,

Jacqui

Jacqueline Ross
Biomedical Imaging Microscopist
Biomedical Imaging Research Unit 
School of Medical Sciences 
Faculty of Medical & Health Sciences
The University of Auckland
Private Bag 92019
Auckland 1142, NEW ZEALAND

Tel: [phone]
Fax: [phone]

http://www.fmhs.auckland.ac.nz/sms/biru/


-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of Rasband, Wayne (NIH/NIMH) [E]
Sent: Tuesday, 3 November 2015 5:34 p.m.
To: [hidden email]
Subject: Re: Free rotation of selection (ROI)

> On Nov 2, 2015, at 10:54 PM, Jacqui Ross <[hidden email]> wrote:
>
> Dear list members,
>
> I know how to rotate a rectangular selection in ImageJ (Edit - Selection - Rotate) if I know what angle I need.
>
> However, I'd like to be able to do a free rotation of the selection in the same way as I can do a rotation of the entire image (Image - Transform - Rotate), i.e. with a Preview option so that you can adjust the angle until it's correct.
>
> Does anyone know how this can be implemented?
>
> The reason for the query is that I am helping a graduate student who needs to align the selection tangentially to an image of the knee joint. The only other way to do it is to rotate the image but this seems a bit clumsy and I'd prefer not to be altering the pixels.

You can interactively rotate selections using the “Selection Rotator” tool, contributed by Peter Haub, which is included with ImageJ 1.50d. To add this tool to the toolbar, select it from the toolbar’s “>>” menu.

-wayne



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