[ImageJ-devel] ROI presentation powerpoint

[Lee Kamentsky]

On 5/25/2011 3:35 AM, Johannes Schindelin wrote:
> Hi Lee,
>
> On Mon, 23 May 2011, Lee Kamentsky wrote:
> - When measuring area and circumference, we should definitely realize that
>    we're working with sampled data, and consequentially we should always
>    have some +/- number with the value.
>
>
Maybe we shouldn't call it area.  There are a lot of circumstances where 
you want to normalize a sum over the pixels in an image by the number of 
pixels, so I've found it handy to keep the number of pixels in a ROI 
cached. So that's the number I'm trying to represent. I think it would 
be great to have an algorithm that could come up with an error estimate 
(or competing algorithms, each calculating the error in its own clever 
way, each arriving at a different, but arguably correct estimate).  
Gabriel Landini has also asked for the perimeter pixels (and from those, 
you can use a structuring element find the "just inside" and "just 
outside" pixels) so I will add that to the ROI interface sometime in the 
near future. But, baby steps, right?
>