🐛 [firebase_ml_vision] Barcode scanner doesn't detect data matrix barcodes

[philiplindberg]

Bug report

Describe the bug
The material barcode scanner doesn't seem to detect data matrix barcodes. Other barcode formats (QR Codes, PDF417, etc...) can be detected without issues.

Steps to reproduce

Steps to reproduce the behavior:

1. Run example app
2. Tap on MaterialBarcodeScanner
3. Point the barcode scanner at a data matrix barcode (example barcode provided below)
4. Barcode scanner is unable to detect barcode

Expected behavior

I would expect the barcode scanner to be able to detect data matrix barcodes, like the barcode below:

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Flutter doctor

Run flutter doctor and paste the output below:

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Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.0.1, on macOS 11.2.2 20D80 darwin-x64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.0)
[✓] VS Code (version 1.54.1)
[✓] Connected device (2 available)

• No issues found!

---

Flutter dependencies

Run flutter pub deps -- --style=compact and paste the output below:

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philiplindberg@Philips-MacBook-Pro example % flutter pub deps -- --style=compact
Dart SDK 2.12.0
Flutter SDK 2.0.1
firebase_ml_vision_example 0.0.0

dependencies:
- camera 0.5.8+5 [flutter]
- cupertino_icons 0.1.3
- firebase_core 0.5.0+1 [firebase_core_platform_interface flutter quiver meta firebase_core_web]
- firebase_ml_vision 0.9.7 [flutter]
- flutter 0.0.0 [characters collection meta typed_data vector_math sky_engine]
- image_picker 0.6.7+4 [flutter flutter_plugin_android_lifecycle image_picker_platform_interface]

dev dependencies:
- e2e 0.6.3 [flutter flutter_driver flutter_test path]
- flutter_driver 0.0.0 [file meta path vm_service webdriver flutter flutter_test fuchsia_remote_debug_protocol archive args async boolean_selector characters charcode clock collection convert crypto fake_async matcher platform process source_span stack_trace stream_channel string_scanner sync_http term_glyph test_api typed_data vector_math]
- flutter_test 0.0.0 [flutter test_api path fake_async clock stack_trace vector_math async boolean_selector characters charcode collection matcher meta source_span stream_channel string_scanner term_glyph typed_data]
- path 1.8.0
- path_provider 1.6.18 [flutter path_provider_platform_interface path_provider_macos path_provider_linux path_provider_windows]
- pedantic 1.11.0
- test 1.16.5 [analyzer async boolean_selector coverage http_multi_server io js node_preamble package_config path pedantic pool shelf shelf_packages_handler shelf_static shelf_web_socket source_span stack_trace stream_channel typed_data web_socket_channel webkit_inspection_protocol yaml test_api test_core]

dependency overrides:
- firebase_core 0.5.0+1 [firebase_core_platform_interface flutter quiver meta firebase_core_web]

transitive dependencies:
- _fe_analyzer_shared 7.0.0 [meta]
- analyzer 0.39.17 [_fe_analyzer_shared args charcode cli_util collection convert crypto glob html meta package_config path pub_semver source_span watcher yaml]
- archive 2.0.13 [crypto args path]
- args 1.6.0
- async 2.5.0 [collection]
- boolean_selector 2.1.0 [source_span string_scanner]
- characters 1.1.0
- charcode 1.2.0
- cli_util 0.2.0 [path]
- clock 1.1.0
- collection 1.15.0
- convert 2.1.1 [charcode typed_data]
- coverage 0.15.2 [args logging package_config path source_maps stack_trace vm_service]
- crypto 2.1.5 [collection convert typed_data]
- csslib 0.16.2 [source_span]
- fake_async 1.2.0 [clock collection]
- ffi 0.1.3
- file 6.0.0 [meta path]
- firebase 7.3.0 [http http_parser js]
- firebase_core_platform_interface 2.0.0 [flutter meta plugin_platform_interface quiver]
- firebase_core_web 0.2.0 [firebase firebase_core_platform_interface flutter flutter_web_plugins meta js]
- flutter_plugin_android_lifecycle 1.0.8 [flutter]
- flutter_web_plugins 0.0.0 [flutter js characters collection meta typed_data vector_math]
- fuchsia_remote_debug_protocol 0.0.0 [process vm_service file meta path platform]
- glob 1.2.0 [async collection node_io path pedantic string_scanner]
- html 0.14.0+3 [csslib source_span]
- http 0.12.2 [http_parser path pedantic]
- http_multi_server 2.2.0 [async]
- http_parser 3.1.4 [charcode collection source_span string_scanner typed_data]
- image_picker_platform_interface 1.1.0 [flutter meta http plugin_platform_interface]
- io 0.3.4 [charcode meta path string_scanner]
- js 0.6.3
- logging 0.11.4
- matcher 0.12.10 [stack_trace]
- meta 1.3.0
- mime 0.9.7
- node_interop 1.1.1 [js]
- node_io 1.1.1 [node_interop path]
- node_preamble 1.4.12
- package_config 1.9.3 [path charcode]
- path_provider_linux 0.0.1+2 [path xdg_directories path_provider_platform_interface flutter]
- path_provider_macos 0.0.4+4 [flutter]
- path_provider_platform_interface 1.0.3 [flutter meta platform plugin_platform_interface]
- path_provider_windows 0.0.4+1 [path_provider_platform_interface meta path flutter ffi win32]
- platform 3.0.0
- plugin_platform_interface 1.0.2 [meta]
- pool 1.5.0 [async stack_trace]
- process 4.0.0 [file path platform]
- pub_semver 1.4.4 [collection]
- quiver 2.1.3 [matcher meta]
- shelf 0.7.9 [async collection http_parser path stack_trace stream_channel]
- shelf_packages_handler 2.0.0 [path shelf shelf_static]
- shelf_static 0.2.8 [convert http_parser mime path shelf]
- shelf_web_socket 0.2.3 [shelf web_socket_channel stream_channel]
- sky_engine 0.0.99
- source_map_stack_trace 2.1.0 [path stack_trace source_maps]
- source_maps 0.10.10 [source_span]
- source_span 1.8.0 [charcode collection path term_glyph]
- stack_trace 1.10.0 [path]
- stream_channel 2.1.0 [async]
- string_scanner 1.1.0 [charcode source_span]
- sync_http 0.2.0
- term_glyph 1.2.0
- test_api 0.2.19 [async boolean_selector collection meta path source_span stack_trace stream_channel string_scanner term_glyph matcher]
- test_core 0.3.15 [analyzer async args boolean_selector collection coverage glob io meta package_config path pedantic pool source_map_stack_trace source_maps source_span stack_trace stream_channel vm_service yaml matcher test_api]
- typed_data 1.3.0 [collection]
- vector_math 2.1.0
- vm_service 5.5.0 [meta]
- watcher 0.9.7+15 [async path pedantic]
- web_socket_channel 1.1.0 [async crypto stream_channel]
- webdriver 2.1.2 [archive matcher path stack_trace sync_http]
- webkit_inspection_protocol 0.7.3 [logging]
- win32 1.7.3 [ffi]
- xdg_directories 0.1.2 [meta path process]
- yaml 2.2.1 [charcode collection string_scanner source_span]

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[markusaksli-nc]

Hi @philiplindberg
This repository only wraps the upstream native Firebase SDKs so they could be used with Flutter. Sadly this just isn't a part of the upstream capability yet https://firebase.google.com/docs/ml-kit/read-barcodes#key_capabilities
As there is nothing for us to fix here, I'm going to close this issue. However, you can request this feature at https://firebase.google.com/support/troubleshooter/report
Thank you

[philiplindberg]

After further testing, I was actually able to get the example app to detect data matrix barcodes like the one I posted above, so it does seem like the Firebase SDKs do support this barcode format after all.

However, I'm now finding that while the library can detect normal data matrix barcodes, it can't seem to detect inverted data matrix barcodes like the one below:

Is there anything that can be done about that?

[markusaksli-nc]

Well what I mentioned still stands, this is up to the Firebase native SDK, not us.