Merge pull request #252 from jze/gpageseg

Fix regression in ocropus-gpageseg #251

ocropus-gpageseg

@@ -106,7 +106,11 @@ parser.add_argument('files',nargs='+')
 args = parser.parse_args()
 args.files = ocrolib.glob_all(args.files)
 
-
+def find(condition):
+    "Return the indices where ravel(condition) is true"
+    res, = np.nonzero(np.ravel(condition))
+    return res
+
 def norm_max(v):
     return v/np.amax(v)
 
@@ -302,7 +306,7 @@ def compute_line_seeds(binary,bottom,top,colseps,scale):
     seeds = np.zeros(binary.shape,'i')
     delta = max(3,int(scale/2))
     for x in range(bmarked.shape[1]):
-        transitions = sorted([(y,1) for y in np.where(bmarked[:,x])[0]]+[(y,0) for y in np.where(tmarked[:,x][0])])[::-1]
+        transitions = sorted([(y,1) for y in find(bmarked[:,x])]+[(y,0) for y in find(tmarked[:,x])])[::-1]
         transitions += [(0,0)]
         for l in range(len(transitions)-1):
             y0,s0 = transitions[l]