added function to decode uploaded image data

src/database/classes.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import logging
+from base64 import b64decode
 from base64 import b64encode
 from io import BytesIO
 from pathlib import Path
@@ -122,6 +123,12 @@ class VisualCommunication(BaseModel):
         image.load()
         return VisualCommunication(name=name, image=image)
 
+    @classmethod
+    def decode_image(cls, content: str) -> Image.Image:
+        """Decode image."""
+        _, content_data = content.split(',')
+        return Image.open(BytesIO(b64decode(content_data)))
+
     @field_serializer('image')
     def serialize_image(image: Image.Image) -> bytes:   # type: ignore
         buffer = BytesIO()