[Brains-users] ROI tracing

[Eugene Zeien]

Roberto,
	Brains2 uses proximity (distance) from the mouse pointer to the roi
to guess where you wanted the selected X to be.  For a small roi, you will
probably have the best chance of getting the X's to land where you expect them,
if you position the pointer slightly outside of the roi.  A somewhat related,
and known, issue is that click-hold tracing defines far more points than
click-move-click tracing.  The benefit of click-hold is finer control of the
section to edit, since there are more points in the roi.  Worst-case roi for
the editting system is one which only contains 3 points, but similarly small
numbers of defined points can lead to selecting odd chunks when editting.

gene zeien
UofI-Image Processing Lab

roberto roiz wrote:
> Hello all
> I have just installed the brains2-FedoraCore3-20050604-1540.i386.rpm version
> on my computer (running on FedoraCore3) and I am having some problems
> editing ROIs. 
> I follow the normal steps to modify a ROI. I edit the trace and pick up
> three points to define the start, middle and end of the region I want to
> modify. Then,this portion of the trace should appear in light blue. My
> problem is that the light blue line I obtain does not correspond to the one
> I edited and my original ROI is automatically changed to funny shapes. I
> have noticed  this happens specially when I'm working with small ROIs  as 
> the venous blood traces. Have anyone experienced anything similar  or does 
> anyone known how to solve this problem?
> 
> Thanks a lot
> 
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