rectangular ROI

[Glen MacDonald-2]

Hello,
Does anyone have a suggestion on how to place a rectangular ROI on an image at an arbitrary rotation?  Thought that I'd ask before writing a macro to generate one from a line.  

Thanks,
glen


Glen MacDonald
Core for Communication Research
Virginia Merrill Bloedel Hearing Research Center
Box 357923
University of Washington
Seattle, WA 98195-7923  USA
[phone]
[hidden email]

[Bill Mohler]

Edit> Selection> Rotate... in the newer versions
 


Glen MacDonald wrote:

> Hello,
> Does anyone have a suggestion on how to place a rectangular ROI on an image at an arbitrary rotation?  Thought that I'd ask before writing a macro to generate one from a line.  
>
> Thanks,
> glen
>
>
> Glen MacDonald
> Core for Communication Research
> Virginia Merrill Bloedel Hearing Research Center
> Box 357923
> University of Washington
> Seattle, WA 98195-7923  USA
> [phone]
> [hidden email]
>
>  

... [show rest of quote]

[Glen MacDonald-2]

Thanks, I  looked at the Tools part of the docs, but forgot about the Selection options.  

Glen
Glen MacDonald
Core for Communication Research
Virginia Merrill Bloedel Hearing Research Center
Box 357923
University of Washington
Seattle, WA 98195-7923  USA
[phone]
[hidden email]



On Jan 28, 2010, at 2:07 PM, Bill Mohler wrote:

> Edit> Selection> Rotate... in the newer versions
>
>
> Glen MacDonald wrote:
>> Hello,
>> Does anyone have a suggestion on how to place a rectangular ROI on an image at an arbitrary rotation?  Thought that I'd ask before writing a macro to generate one from a line.  
>> Thanks,
>> glen
>>
>>
>> Glen MacDonald
>> Core for Communication Research
>> Virginia Merrill Bloedel Hearing Research Center
>> Box 357923
>> University of Washington
>> Seattle, WA 98195-7923  USA
>> [phone]
>> [hidden email]
>>
>>  

... [show rest of quote]

[Glen MacDonald-2]

Close, but doesn't work.  Once a rectangular ROI has been rotated Plot Profile no longer recognizes it as a rectangle.  
On Jan 28, 2010, at 2:07 PM, Bill Mohler wrote:

> Edit> Selection> Rotate... in the newer versions
>
>
> Glen MacDonald wrote:
>> Hello,
>> Does anyone have a suggestion on how to place a rectangular ROI on an image at an arbitrary rotation?  Thought that I'd ask before writing a macro to generate one from a line.  
>> Thanks,
>> glen
>>
>>
>> Glen MacDonald
>> Core for Communication Research
>> Virginia Merrill Bloedel Hearing Research Center
>> Box 357923
>> University of Washington
>> Seattle, WA 98195-7923  USA
>> [phone]
>> [hidden email]
>>
>>  

... [show rest of quote]

[Anda Cornea]

Why a rectangle and not a line, a very thick line.

Anda Cornea, Ph.D.
Director of the Imaging Core
Oregon National Primate Research Center
Oregon Heath & Science University
503-690-5293

-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of Glen MacDonald
Sent: Thursday, January 28, 2010 4:40 PM
To: [hidden email]
Subject: Re: rectangular ROI

Close, but doesn't work.  Once a rectangular ROI has been rotated Plot Profile no longer recognizes it as a rectangle.  
On Jan 28, 2010, at 2:07 PM, Bill Mohler wrote:

> Edit> Selection> Rotate... in the newer versions
>
>
> Glen MacDonald wrote:
>> Hello,
>> Does anyone have a suggestion on how to place a rectangular ROI on an image at an arbitrary rotation?  Thought that I'd ask before writing a macro to generate one from a line.  
>> Thanks,
>> glen
>>
>>
>> Glen MacDonald
>> Core for Communication Research
>> Virginia Merrill Bloedel Hearing Research Center
>> Box 357923
>> University of Washington
>> Seattle, WA 98195-7923  USA
>> [phone]
>> [hidden email]
>>
>>  

... [show rest of quote]

[Glen MacDonald-2]

Because I'm getting aged and forgetful, as you keep reminding me.
Coulda sworn I tried that awhile back and it didn't work.  Oh well, problem solved, thanks.

Glen
On Jan 28, 2010, at 4:47 PM, Anda Cornea wrote:

> Why a rectangle and not a line, a very thick line.
>
> Anda Cornea, Ph.D.
> Director of the Imaging Core
> Oregon National Primate Research Center
> Oregon Heath & Science University
> 503-690-5293
>
> -----Original Message-----
> From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of Glen MacDonald
> Sent: Thursday, January 28, 2010 4:40 PM
> To: [hidden email]
> Subject: Re: rectangular ROI
>
> Close, but doesn't work.  Once a rectangular ROI has been rotated Plot Profile no longer recognizes it as a rectangle.  
> On Jan 28, 2010, at 2:07 PM, Bill Mohler wrote:
>
>> Edit> Selection> Rotate... in the newer versions
>>
>>
>> Glen MacDonald wrote:
>>> Hello,
>>> Does anyone have a suggestion on how to place a rectangular ROI on an image at an arbitrary rotation?  Thought that I'd ask before writing a macro to generate one from a line.  
>>> Thanks,
>>> glen
>>>
>>>
>>> Glen MacDonald
>>> Core for Communication Research
>>> Virginia Merrill Bloedel Hearing Research Center
>>> Box 357923
>>> University of Washington
>>> Seattle, WA 98195-7923  USA
>>> [phone]
>>> [hidden email]
>>>
>>>

... [show rest of quote]

[Judith M]

Hello,

I want to compare the same sized rectangular ROI between different images, but some ROI's are rotated and some are not. When I rotate a rectangular ROI the area of it changes. Is there any way to rotate a ROI, but keep the area the same?

Thanks,
Judith

[Sheryn Olson]

Hello All,
I have a similar problem as Judith Mars'.   I have an irregular shape ROI
that has to be superimposed on some few thousand photos.  The shape needs
to be a mask that I can re-size and move to line it up with each photo.
I'm not sure how to make the mask portable from photo to photo and then,
same as Judith, manage to rotate and/or size it.  Thanks much!  Sheryn

On Sun, Nov 25, 2012 at 5:32 PM, Judith M <[hidden email]> wrote:

> Hello,
>
> I want to compare the same sized rectangular ROI between different images,
> but some ROI's are rotated and some are not. When I rotate a rectangular
> ROI
> the area of it changes. Is there any way to rotate a ROI, but keep the area
> the same?
>
> Thanks,
> Judith
>
>
>
> --
> View this message in context:
> http://imagej.1557.n6.nabble.com/rectangular-ROI-tp3689560p5000955.html
> Sent from the ImageJ mailing list archive at Nabble.com.
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

... [show rest of quote]

--
Sheryn Olson
Graduate Research Assistant
Department of Wildlife Ecology
The University of Maine
210 Nutting Hall
Orono, ME 04469

[phone]
[phone] cell

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

[Michael Schmid]

Hi Judith,

when rotating a ROI, there is always a small error due to the finite size of the pixels.
ImageJ uses sub-pixel accuracy for the corners of the rotated rectangle, but the image pixels have integer coordinates, so they are considered either inside or outside the rectangle, even if the border would actually cut a pixel into one portion inside and the rest outside.

Anyhow, this error is much smaller (usually below 1% unless you have very small rectangles) than all the other errors typically involved in image processing. If you want to reduce it, enlarge the image; then the area will be more accurate.

Michael
________________________________________________________________
On Nov 25, 2012, at 23:32, Judith M wrote:

> Hello,
>
> I want to compare the same sized rectangular ROI between different images,
> but some ROI's are rotated and some are not. When I rotate a rectangular ROI
> the area of it changes. Is there any way to rotate a ROI, but keep the area
> the same?
>
> Thanks,
> Judith

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

[Jacob Keller]

Perhaps you should reverse the thinking a bit, and align the images
first, using the plugin "image stabilizer?" Then you would not need to
do any ROI adjustment...

Jacob

On Sun, Nov 25, 2012 at 5:56 PM, Sheryn Olson <[hidden email]> wrote:

> Hello All,
> I have a similar problem as Judith Mars'.   I have an irregular shape ROI
> that has to be superimposed on some few thousand photos.  The shape needs
> to be a mask that I can re-size and move to line it up with each photo.
> I'm not sure how to make the mask portable from photo to photo and then,
> same as Judith, manage to rotate and/or size it.  Thanks much!  Sheryn
>
> On Sun, Nov 25, 2012 at 5:32 PM, Judith M <[hidden email]> wrote:
>
>> Hello,
>>
>> I want to compare the same sized rectangular ROI between different images,
>> but some ROI's are rotated and some are not. When I rotate a rectangular
>> ROI
>> the area of it changes. Is there any way to rotate a ROI, but keep the area
>> the same?
>>
>> Thanks,
>> Judith
>>
>>
>>
>> --
>> View this message in context:
>> http://imagej.1557.n6.nabble.com/rectangular-ROI-tp3689560p5000955.html
>> Sent from the ImageJ mailing list archive at Nabble.com.
>>
>> --
>> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>>
>
>
>
> --
> Sheryn Olson
> Graduate Research Assistant
> Department of Wildlife Ecology
> The University of Maine
> 210 Nutting Hall
> Orono, ME 04469
>
> [phone]
> [phone] cell
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

... [show rest of quote]

--
*******************************************
Jacob Pearson Keller
Northwestern University
Medical Scientist Training Program
email: [hidden email]
*******************************************

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

[Judith M]

Thanks for the advise Michael.