Don't take a bigger segmentation stack than we need for a small data set

Signed-off-by: Andrew King <@esrf.fr>

2_difspot/gtSegmentationDoubleThreshold.m

@@ -163,10 +163,14 @@ else
     stack.totproj = parameters.acq.nproj;
 end
 
+% don't take more than we need
+parameters.seg.segmentation_stack_size = ...
+    min((parameters.acq.nproj+parameters.seg.maxblobsize(3))*2,...
+    parameters.seg.segmentation_stack_size)
+
 % read in the volume to work on
 % check that the size makes sense
 stack.pad = parameters.seg.maxblobsize(3);
-
 stack.sizeZ = parameters.seg.segmentation_stack_size;
 fprintf('Using %d images in memory (from parameters.seg)\n\n', stack.sizeZ)