Move Image._iter_lines() to Page class.

pixelocr/image.py

@@ -59,7 +59,7 @@ def combine(*images):
     return Image(data, left, top)
 
 
-def _is_nonblank(bitmap):
+def is_nonblank(bitmap):
     """Return True if bitmap contains at least one black (=1) pixel."""
     return bitmap.any()
 
@@ -159,7 +159,7 @@ class Image(object):
 
     @cached_property
     def isspace(self):
-        return not _is_nonblank(self.bitmap)
+        return not is_nonblank(self.bitmap)
 
     def serialize(self):
         """Serialize the image as some hashable object."""
@@ -196,7 +196,7 @@ class Image(object):
 
         def _get_margin_height(rows):
             for i, row in enumerate(rows):
-                if _is_nonblank(row):
+                if is_nonblank(row):
                     return i
             return 0
 
@@ -218,34 +218,3 @@ class Image(object):
             and self.right <= right
             and self.bottom <= bottom
         )
-
-    def _iter_lines(self, min_space):
-        def iter_lines():
-            line_start = None
-            prev_line_end = 0
-
-            for i, row in enumerate(self.bitmap):
-                if _is_nonblank(row):
-                    if line_start is None:
-                        line_start = i
-                else:
-                    if line_start is not None:
-                        yield self[line_start:i,:]
-                        line_start = None  
-                        prev_line_end = i
-
-        def merge_lines(lines):
-            prev_line = None
-            for line in lines:
-                if prev_line is None:
-                    prev_line = line
-                else:
-                    if line.top - prev_line.bottom < min_space:
-                        prev_line = self[prev_line.top:line.bottom]
-                    else:
-                        yield prev_line
-                        prev_line = line
-            if prev_line is not None:
-                yield prev_line
-
-        return merge_lines(iter_lines())

pixelocr/page.py

@@ -22,7 +22,7 @@ from scipy import ndimage
 from scipy.ndimage import filters
 
 from .utils import cached_property, collect_iterable, pairwise, neighbourhood
-from .image import Image, combine
+from .image import Image, combine, is_nonblank
 
 
 CONNECTIVITY8 = ndimage.generate_binary_structure(2, 2)
@@ -111,8 +111,36 @@ class Page(PageObject):
     @cached_property
     @collect_iterable
     def lines(self):
-        for line_img in self.image._iter_lines(min_space=2):
-            yield Line(line_img)
+        return self._merge_lines(self._iter_lines())
+
+    def _iter_lines(self):
+        line_start = None
+        prev_line_end = 0
+
+        for i, row in enumerate(self.image.bitmap):
+            if is_nonblank(row):
+                if line_start is None:
+                    line_start = i
+            else:
+                if line_start is not None:
+                    yield Line(self.image[line_start:i,:])
+                    line_start = None
+                    prev_line_end = i
+
+    def _merge_lines(self, lines, min_space=2):
+        prev_line = None
+        for line in lines:
+            if prev_line is None:
+                prev_line = line
+            else:
+                if line.top - prev_line.bottom < min_space:
+                    prev_line = Line(self.image[prev_line.top:line.bottom])
+                else:
+                    yield prev_line
+                    prev_line = line
+        if prev_line is not None:
+            yield prev_line
+
 
 
 class Line(PageObject):