[ImageJ-devel] alpha 3

[Lee Kamentsky]

I've added a line style to overlays - dashes, dots, dot-dashes and none 
(= outline disappears) in addition to Solid.

For the current design, I think that ROI painting will still be slow and 
will need to be optimized. I'm thinking that first-class support of 
image segmentations will mean that more users will do things like 
particle analysis which will generate a large number of ROIs. We could 
be clever here and, because the ROIs are derived from a single labeling, 
the labeling could be represented as a first-class object in the UI 
instead of as a collection of ROIs (but still allowing individual ROIs 
to be selected) by having a labeling DataObject similar to Overlay. 
There would be a corresponding view which would be rendered as one 
bitmap; it's fast to both generate the bitmap (two passes over the 
labeling within the currently displayed plane) and economical to store 
and display its graphical object.

Are there any other use cases that generate a large number of ROIs?

--Lee

On 6/5/2011 2:32 PM, Gabriel Landini wrote:
> Hi
> Great to see the alpha 3 out. Not sure if people are happy for comments at
> this stage, but just in case... All comments are made with a positive intent.
>
> For some reason, the images (for example the Clown sample) when enlarged, the
> first and last rows and columns of pixels appear to have pixels that are half
> the size of the rest of the image pixels. (Sure pixels do not have area, but
> for positioning of ROIs and so on perhaps they should be represented as the
> rest of the pixels).
>
> I see that ROIs have a black border around. Is there any plan to be able to
> turn that off? Otherwise we cannot see what is underneath the ROI. Or perhaps
> best to make these semi transparent? Or with dotted lines in alternating
> colours?  I see lots of room for confusion in terms of what is the image and
> what is overlay or things disappearing because the overlay having the same
> colour as the background.
>
> Something I noted in IJ1 is that having lots of overlays being shown makes it
> run very slow. Has anybody noticed this? Maybe they get refreshed/repainted
> too often. I wonder if it is worth looking at the performance of having ROIs
> as overlays as they appear in the alpha 3.
>
> I also noted that the black border around images cannot be switched off in the
> Edit Options. I wonder if this is related to the half pixel display mentioned
> above.
>
> Regards to all,
>
> Gabriel
>
>
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