small debug regarding generation of projections shape (size of HS cube was...

small debug regarding generation of projections shape (size of HS cube was used even though in this version, the size can be different than the size of the FPA).

helpers/cube2ctis.py

@@ -44,8 +44,8 @@ def create_CTIS_from_HSI(HSI, CTIS_geom_params, o0_attenuator, gain, wl_range, L
 
     # Get the cube
     H, W, L = HSI.shape
-    mid_H = int(H/2)
-    mid_W = int(W/2)
+    mid_H = int(L_CTIS/2)
+    mid_W = int(L_CTIS/2)
 
     # Create empty CTIS image
     CTIS = np.zeros((L_CTIS,L_CTIS))