diff --git a/ppocr/data/det/db_process.py b/ppocr/data/det/db_process.py
index cdb8efc2bd9028ff5fc004f13b6505db5d74328c..b64b8c8d227f293aff0eff90d1d85dee8dd85fce 100644
--- a/ppocr/data/det/db_process.py
+++ b/ppocr/data/det/db_process.py
@@ -194,8 +194,12 @@ class DBProcessTest(object):
         img_std = [0.229, 0.224, 0.225]
         im = im.astype(np.float32, copy=False)
         im = im / 255
-        im -= img_mean
-        im /= img_std
+        im[:, :, 0] -= img_mean[0]
+        im[:, :, 1] -= img_mean[1]
+        im[:, :, 2] -= img_mean[2]
+        im[:, :, 0] /= img_std[0]
+        im[:, :, 1] /= img_std[1]
+        im[:, :, 2] /= img_std[2]
         channel_swap = (2, 0, 1)
         im = im.transpose(channel_swap)
         return im