[ome-users] Image coordinate reference

[Melissa Linkert]

Hi Ghislain,

As far as I know, the (0, 0) coordinate corresponds to the top left corner.  All 
of the file formats that I've seen so far use (0, 0) as the top left, so that's 
how Bio-Formats populates ROIs.

The SVG specification (on which OME-XML ROIs are based) does say that (0, 0) 
corresponds to the top left corner - see 
http://www.w3.org/TR/SVG11/coords.html#InitialCoordinateSystem.  However, this 
isn't explicitly documented in the OME-XML schema, so it may be that you are 
correct and (0, 0) should correspond to the bottom left.

Regards,
-Melissa

Ghislain Bonamy wrote:
> Hello everyone,
> 
>  
> 
> I wanted to verify what was frame of reference that OME uses to map ROI to a picture. I assume that the image coordinate x=0,y=0 corresponds to the bottom left corner and that Y increases going up and X increases going right, but perhaps this is not correct.
> 
>  
> 
> Acapella which I use to generate my ROI coordinate list uses 0,0 as the top left corner with increasing Y values going down and increasing X values going left (most likely due to the way the image is read). I want to make sure that I am not missing anything when I create a ROI set to use in conjunction with OME.
> 
>  
> 
> Thanks for the info,
> 
>  
> 
> Ghislain Bonamy, PhD 
> _______________________________
> Genomic Institute of the
> Novartis Research
> Foundation
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