[ImageJ-devel] ROI presentation powerpoint

[Johannes Schindelin]

Hi,

On Wed, 25 May 2011, Lee Kamentsky wrote:

> On 5/25/2011 3:35 AM, Johannes Schindelin wrote:
>
> > 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?

Baby steps work for me. The best way to develop things.

Thanks!
Dscho