Add Image.bbox(), Image.overlaps() and Image.combine().

pixelocr/image.py

@@ -167,6 +167,34 @@ class Image(object):
         data = np.ma.masked_array(self.data, mask3, fill_value=255).filled()
         return Image(data, self.x, self.y)
 
+    def bbox(self, other):
+        return (
+            min(self.left, other.left),
+            min(self.top, other.top),
+            max(self.right, other.right),
+            max(self.bottom, other.bottom),
+        )
+
+    def overlaps(self, other):
+        return not (self.right < other.left or other.left < self.right)
+
+    def combine(self, other):
+        if self.overlaps(other):
+            raise NotImplementedError
+
+        left, top, right, bottom = self.bbox(other)
+        width = right - left
+        height = bottom - top
+        selftop = self.top - top
+        othertop = other.top - top
+        selfleft = self.left - left
+        otherleft = other.left - left
+        data = np.zeros((height, width, self.shape[2]), self.data.dtype)
+        data.fill(255)
+        data[selftop:selftop + self.height, selfleft:selfleft + self.width] = self.data
+        data[othertop:othertop + other.height, otherleft:otherleft + other.width] = other.data
+        return Image(data, left, top)
+
     def _iter_lines(self, min_space):
         def iter_lines():
             line_start = None