Blob-definition: updated and made able to generate arrays of them

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

zUtil_ForwardSim/gtFwdSimBlobDefinition.m

-function blob = gtFwdSimBlobDefinition(type)
-% function blob = gtFwdSimBlobDefinition(type)
+function blob = gtFwdSimBlobDefinition(type, num_blobs)
+% function blob = gtFwdSimBlobDefinition(type, num_blobs)
 %
 
     if (~exist('type', 'var') || isempty(type))
@@ -18,7 +18,7 @@ function blob = gtFwdSimBlobDefinition(type)
                 'bbnim',     zeros(0, 2), ... % Shape function's limits in eta
                 'bbwim',     zeros(0, 2), ... % Shape function's limits in W
                 'bbsize',    zeros(0, 2) );   % Shape function's BoundingBox (includes margins)
-        otherwise
+        case {'blob', 'sf_uvw'}
             blob = struct( ...
                 'intm',      [], ...          % The normalized blob
                 'mask',      [], ...          % The segmentation mask
@@ -31,5 +31,12 @@ function blob = gtFwdSimBlobDefinition(type)
                 'mbbw',      zeros(0, 2), ... % Real (Measured) Blob BB on W <- Not strictly w
                 'mbbsize',   zeros(0, 3), ... % Real (Measured) Blob Bounding Box
                 'intensity', zeros(0, 1) );   % Blob original intensity
+        otherwise
+            error('gtFwdSimBlobDefinition:wrong_argument', ...
+                'Unnown blob tye: "%s"', type)
+    end
+
+    if (exist('num_blobs', 'var') && ~isempty(num_blobs))
+        blob(2:num_blobs) = blob;
     end
 end