[Fix] Catch Divide by zero explicit (#1471)

doctr/utils/geometry.py

@@ -337,7 +337,13 @@ def estimate_page_angle(polys: np.ndarray) -> float:
     yleft = polys[:, 0, 1] + polys[:, 3, 1]
     xright = polys[:, 1, 0] + polys[:, 2, 0]
     yright = polys[:, 1, 1] + polys[:, 2, 1]
-    return float(np.median(np.arctan((yleft - yright) / (xright - xleft))) * 180 / np.pi)  # Y axis from top to bottom!
+    with np.errstate(divide="raise", invalid="raise"):
+        try:
+            return float(
+                np.median(np.arctan((yleft - yright) / (xright - xleft)) * 180 / np.pi)  # Y axis from top to bottom!
+            )
+        except FloatingPointError:
+            return 0.0
 
 
 def convert_to_relative_coords(geoms: np.ndarray, img_shape: Tuple[int, int]) -> np.ndarray:

tests/common/test_utils_geometry.py

@@ -159,6 +159,10 @@ def test_estimate_page_angle():
     rotated_polys = geometry.rotate_boxes(straight_polys, angle=20, orig_shape=(512, 512))
     angle = geometry.estimate_page_angle(rotated_polys)
     assert np.isclose(angle, 20)
+    # Test divide by zero / NaN
+    invalid_poly = np.array([[[0.5, 0.5], [0.5, 0.5], [0.5, 0.5], [0.5, 0.5]]])
+    angle = geometry.estimate_page_angle(invalid_poly)
+    assert angle == 0.0
 
 
 def test_extract_crops(mock_pdf):