diff --git a/detect.py b/detect.py
index fbe156ac..167dc587 100755
--- a/detect.py
+++ b/detect.py
@@ -8,6 +8,10 @@ from utils.utils import *
 from utils import torch_utils
 
 
+def unletterbox(img0_shape, letterbox_shape):
+    return None
+
+
 def detect(cfg, weights, images, output='output', img_size=416, conf_thres=0.3, nms_thres=0.45,
            save_txt=False, save_images=True):
     device = torch_utils.select_device()
@@ -69,12 +73,10 @@ def detect(cfg, weights, images, output='output', img_size=416, conf_thres=0.3,
 
                 for x1, y1, x2, y2, conf, cls_conf, cls_pred in detections:
                     # Rescale coordinates to original dimensions
-                    box_h = ((y2 - y1) / unpad_h) * im0.shape[0]
-                    box_w = ((x2 - x1) / unpad_w) * im0.shape[1]
                     y1 = (((y1 - pad_y // 2) / unpad_h) * im0.shape[0]).round()
                     x1 = (((x1 - pad_x // 2) / unpad_w) * im0.shape[1]).round()
-                    x2 = (x1 + box_w).round()
-                    y2 = (y1 + box_h).round()
+                    y2 = (((y2 - pad_y // 2) / unpad_h) * im0.shape[0]).round()
+                    x2 = (((x2 - pad_x // 2) / unpad_w) * im0.shape[1]).round()
                     x1, y1, x2, y2 = max(x1, 0), max(y1, 0), max(x2, 0), max(y2, 0)
 
                     if save_txt:  # Write to file
diff --git a/utils/datasets.py b/utils/datasets.py
index 59cd7bc3..00ad081c 100755
--- a/utils/datasets.py
+++ b/utils/datasets.py
@@ -193,24 +193,13 @@ class load_images_and_labels():  # for training
 def letterbox(img, height=416, color=(0, 0, 0)):  # resize a rectangular image to a padded square
     shape = img.shape[:2]  # shape = [height, width]
     ratio = float(height) / max(shape)  # ratio  = old / new
-    new_shape = [round(shape[0] * ratio), round(shape[1] * ratio)]
-    dw = height - new_shape[1]  # width padding
-    dh = height - new_shape[0]  # height padding
-    top, bottom = dh // 2, dh - (dh // 2)
-    left, right = dw // 2, dw - (dw // 2)
-    img = cv2.resize(img, (new_shape[1], new_shape[0]), interpolation=cv2.INTER_AREA)  # resized, no border
-    return cv2.copyMakeBorder(img, top, bottom, left, right, cv2.BORDER_CONSTANT, value=color), ratio, dw // 2, dh // 2
+    new_shape = (round(shape[1] * ratio), round(shape[0] * ratio))
+    padw = (height - new_shape[0]) // 2  # width padding
+    padh = (height - new_shape[1]) // 2  # height padding
+    img = cv2.resize(img, new_shape, interpolation=cv2.INTER_AREA)  # resized, no border
+    img = cv2.copyMakeBorder(img, padh, padh, padw, padw, cv2.BORDER_CONSTANT, value=color)  # padded square
+    return img, ratio, padw, padh
 
-def letterbox_undo(img, height=416, color=(0, 0, 0)):  # resize a rectangular image to a padded square
-    shape = img.shape[:2]  # shape = [height, width]
-    ratio = float(height) / max(shape)  # ratio  = old / new
-    new_shape = [round(shape[0] * ratio), round(shape[1] * ratio)]
-    dw = height - new_shape[1]  # width padding
-    dh = height - new_shape[0]  # height padding
-    top, bottom = dh // 2, dh - (dh // 2)
-    left, right = dw // 2, dw - (dw // 2)
-    img = cv2.resize(img, (new_shape[1], new_shape[0]), interpolation=cv2.INTER_AREA)  # resized, no border
-    return cv2.copyMakeBorder(img, top, bottom, left, right, cv2.BORDER_CONSTANT, value=color), ratio, dw // 2, dh // 2
 
 def random_affine(img, targets=None, degrees=(-10, 10), translate=(.1, .1), scale=(.9, 1.1), shear=(-2, 2),
                   borderValue=(127.5, 127.5, 127.5)):