Speed up preprocessing.

extras/easypose/utils.py

@@ -11,13 +11,10 @@ def letterbox(img: np.ndarray, target_size: Sequence[int], fill_value: int = 128
 
     scale = min(tw / w, th / h)
     nw, nh = int(w * scale), int(h * scale)
-
-    resized_img = cv2.resize(img, (nw, nh))
+    dx, dy = (tw - nw) // 2, (th - nh) // 2
 
     canvas = np.full((th, tw, img.shape[2]), fill_value, dtype=img.dtype)
-
-    dx, dy = (tw - nw) // 2, (th - nh) // 2
-    canvas[dy:dy + nh, dx:dx + nw, :] = resized_img
+    canvas[dy:dy + nh, dx:dx + nw, :] = cv2.resize(img, (nw, nh))
 
     return canvas, dx, dy, scale