From d126f3026cd69f981170f26f31916605000634b3 Mon Sep 17 00:00:00 2001
From: Johannes L <tehkillerbee@users.noreply.github.com>
Date: Sun, 8 May 2022 11:20:49 +0200
Subject: [PATCH] [Enhancement] Add support for latest Pillow resampling filter
 naming scheme (#1931)

* Add support for latest Pillow resampling filter naming scheme

* Comments added

* Shortened comments, lint fixes

* Added specific Pillow version
---
 mmcv/image/geometric.py | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/mmcv/image/geometric.py b/mmcv/image/geometric.py
index cf62ada73..4c423bf2a 100644
--- a/mmcv/image/geometric.py
+++ b/mmcv/image/geometric.py
@@ -37,15 +37,27 @@ cv2_interp_codes = {
     'lanczos': cv2.INTER_LANCZOS4
 }
 
+# Pillow >=v9.1.0 use a slightly different naming scheme for filters.
+# Set pillow_interp_codes according to the naming scheme used.
 if Image is not None:
-    pillow_interp_codes = {
-        'nearest': Image.NEAREST,
-        'bilinear': Image.BILINEAR,
-        'bicubic': Image.BICUBIC,
-        'box': Image.BOX,
-        'lanczos': Image.LANCZOS,
-        'hamming': Image.HAMMING
-    }
+    if hasattr(Image, 'Resampling'):
+        pillow_interp_codes = {
+            'nearest': Image.Resampling.NEAREST,
+            'bilinear': Image.Resampling.BILINEAR,
+            'bicubic': Image.Resampling.BICUBIC,
+            'box': Image.Resampling.BOX,
+            'lanczos': Image.Resampling.LANCZOS,
+            'hamming': Image.Resampling.HAMMING
+        }
+    else:
+        pillow_interp_codes = {
+            'nearest': Image.NEAREST,
+            'bilinear': Image.BILINEAR,
+            'bicubic': Image.BICUBIC,
+            'box': Image.BOX,
+            'lanczos': Image.LANCZOS,
+            'hamming': Image.HAMMING
+        }
 
 
 def imresize(img,