diff --git a/cv_analysis/figure_detection/figure_detection.py b/cv_analysis/figure_detection/figure_detection.py
index 750bcf4..4807930 100644
--- a/cv_analysis/figure_detection/figure_detection.py
+++ b/cv_analysis/figure_detection/figure_detection.py
@@ -1,11 +1,11 @@
 from functools import partial
 
-import cv2
 import numpy as np
+from funcy import lmap
 
 from cv_analysis.figure_detection.figures import detect_large_coherent_structures
 from cv_analysis.figure_detection.text import remove_primary_text_regions
-from cv_analysis.utils.conversion import box_to_rectangle
+from cv_analysis.utils.conversion import contour_to_rectangle
 from cv_analysis.utils.filters import (
     is_large_enough,
     has_acceptable_format,
@@ -24,8 +24,7 @@ def detect_figures(image: np.array):
     contours = detect_large_coherent_structures(image)
     contours = filter(figure_filter, contours)
 
-    boxes = map(cv2.boundingRect, contours)
-    rectangles = map(box_to_rectangle, boxes)
+    rectangles = lmap(contour_to_rectangle, contours)
     rectangles = remove_included(rectangles)
 
     return rectangles
@@ -33,7 +32,7 @@ def detect_figures(image: np.array):
 
 def is_likely_figure(min_area, max_area, max_width_to_height_ratio, contours):
     return (
-            is_small_enough(contours, max_area)
-            and is_large_enough(contours, min_area)
-            and has_acceptable_format(contours, max_width_to_height_ratio)
+        is_small_enough(contours, max_area)
+        and is_large_enough(contours, min_area)
+        and has_acceptable_format(contours, max_width_to_height_ratio)
     )
diff --git a/cv_analysis/figure_detection/figures.py b/cv_analysis/figure_detection/figures.py
index 18a5d16..b4897a7 100644
--- a/cv_analysis/figure_detection/figures.py
+++ b/cv_analysis/figure_detection/figures.py
@@ -1,6 +1,8 @@
 import cv2
 import numpy as np
 
+from cv_analysis.utils.common import find_contours
+
 
 def detect_large_coherent_structures(image: np.array):
     """Detects large coherent structures on an image.
@@ -20,6 +22,6 @@ def detect_large_coherent_structures(image: np.array):
     close_kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (20, 20))
     close = cv2.morphologyEx(dilate, cv2.MORPH_CLOSE, close_kernel, iterations=1)
 
-    cnts, _ = cv2.findContours(close, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
+    contours, _ = find_contours(close)
 
-    return cnts
+    return contours
diff --git a/cv_analysis/utils/common.py b/cv_analysis/utils/common.py
index 1d71794..b7bc067 100644
--- a/cv_analysis/utils/common.py
+++ b/cv_analysis/utils/common.py
@@ -4,4 +4,4 @@ from funcy import first
 
 def find_contours(image):
     contours, hierarchies = cv2.findContours(image, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
-    return contours, first(hierarchies)
+    return contours, first(hierarchies) if hierarchies is not None else None
diff --git a/cv_analysis/utils/conversion.py b/cv_analysis/utils/conversion.py
index e03e3bc..3b0e100 100644
--- a/cv_analysis/utils/conversion.py
+++ b/cv_analysis/utils/conversion.py
@@ -1,8 +1,14 @@
 import json
 
+import cv2
+
 from cv_analysis.utils.rectangle import Rectangle
 
 
+def contour_to_rectangle(contour):
+    return box_to_rectangle(cv2.boundingRect(contour))
+
+
 def box_to_rectangle(box):
     x, y, w, h = box
     return Rectangle(x, y, x + w, y + h)
diff --git a/cv_analysis/utils/display.py b/cv_analysis/utils/display.py
index 0d3f2a6..ca6781f 100644
--- a/cv_analysis/utils/display.py
+++ b/cv_analysis/utils/display.py
@@ -1,4 +1,5 @@
 import cv2
+from PIL import Image
 from matplotlib import pyplot as plt
 
 
@@ -22,11 +23,15 @@ def show_image_mpl(image):
     plt.show()
 
 
-def show_image(image, backend="m"):
-    if backend.startswith("m"):
+def show_image(image, backend="mpl"):
+    if backend == "mpl":
         show_image_mpl(image)
-    else:
+    elif backend == "cv2":
         show_image_cv2(image)
+    elif backend == "pil":
+        Image.fromarray(image).show()
+    else:
+        raise ValueError(f"Unknown backend: {backend}")
 
 
 def save_image(image, path):
diff --git a/cv_analysis/utils/drawing.py b/cv_analysis/utils/drawing.py
index c07c7e6..9980a95 100644
--- a/cv_analysis/utils/drawing.py
+++ b/cv_analysis/utils/drawing.py
@@ -7,8 +7,8 @@ def draw_contours(image, contours):
 
     image = copy_and_normalize_channels(image)
 
-    for cont in contours:
-        cv2.drawContours(image, cont, -1, (0, 255, 0), 4)
+    for contour in contours:
+        cv2.drawContours(image, contour, -1, (0, 255, 0), 4)
 
     return image
 
diff --git a/scripts/annotate.py b/scripts/annotate.py
index 1056312..56b3597 100644
--- a/scripts/annotate.py
+++ b/scripts/annotate.py
@@ -69,4 +69,7 @@ def main(args):
 
 
 if __name__ == "__main__":
-    main(parse_args())
+    try:
+        main(parse_args())
+    except KeyboardInterrupt:
+        pass