dctfilename binary in base64

Cargo.lock

@@ -14,6 +14,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
 [[package]]
 name = "bit_field"
 version = "0.10.1"
@@ -234,6 +240,7 @@ dependencies = [
 name = "image_similarity"
 version = "0.1.0"
 dependencies = [
+ "base64",
  "image",
  "rmp-serde",
  "serde",