Update preprocessor_config.json

preprocessor_config.json

@@ -19,8 +19,8 @@
   "resample": 3,
   "rescale_factor": 0.00392156862745098,
   "size": {
-    "height": 384,
-    "width": 384
+    "height": 768,
+    "width": 768
   },
   "size_divisor": 32
 }