opencv_dart #

OpenCV for Flutter.

• opencv_dart
  • Example
  • Supported Platforms
  • Status
    • Core Modules
    • Contrib Modules
  • Usage
    • Pure Dart
    • Asynchronous
    • Flutter
    • Configure hooks options
  • TODO
  • Contributors
  • Acknowledgement
  • Star History
  • License

Example #

Supported Platforms #

Status #

Core Modules #

Contrib Modules #

• ❌ : not finished
• ☑️ : partially supported
• ✅ : finished
• modules not in the above table are not considered, contributions are welcome
• VideoIO and HighGUI modules dynamically linked FFMPEG, you should be careful with the license, this project takes no responsibility for the license.

Usage #

Pure Dart

import 'package:dartcv4/dartcv.dart' as cv;

void main() {
  final img = cv.imread("test/images/lenna.png", flags: cv.IMREAD_COLOR);
  final gray = cv.cvtColor(img, gray, cv.COLOR_BGR2GRAY);
  print("${img.rows}, ${img.cols}");

  cv.imwrite("test_cvtcolor.png", gray);
}

Asynchronous

import 'package:dartcv4/dartcv.dart' as cv;
import 'dart:async';
void main() async {
  final img = await cv.imreadAsync("test/images/lenna.png", flags: cv.IMREAD_COLOR);
  final gray = await cv.cvtColorAsync(img, cv.COLOR_BGR2GRAY);
  print("${img.rows}, ${img.cols}");

  await cv.imwriteAsync("test_cvtcolor.png", gray);
}

Flutter

see example

More examples are on the way... see opencv_dart.examples and share yours

Configure hooks options

dartcv4 now supports hooks options, you can configure it in pubspec.yaml

hooks:
  user_defines:
    dartcv4:
      # debug: true
      include_modules: # `core` is always included
        - imgcodecs
        - imgproc
        # ...
      exclude_modules:
        - contrib
        - dnn
        # ...

• debug: enable debug mode, default is false, if enabled, all messages will be printed to stderr.
• valid modules:
  • core: always included
  • included by default:
    • calib3d
    • features2d
    • imgproc
    • imgcodecs
    • objdetect
    • photo
    • stitching
  • excluded by default:
    • contrib
    • dnn
    • freetype
    • highgui
    • video
    • videoio
• Note: even a module is excluded, it's dart code is still available, but throws a symbol not found exception when called.
• videoio and highgui will introduce FFMPEG dynamic libraries (except for ios, ffmpeg is not supported on ios for now).

TODO #

• ✅ compile libs for android, linux
• ✅ support for iOS, macOS
• ✅ add more examples
• ❌ documentation
• ✅ modify C wrapper to catch exceptions
• ✅ Native Assets
• ✅ async?
• ✅ more/full test coverage
• ✅ directly include opencv source code, refactor cmakelists.txt

Contributors #

rainy liu	Abdelaziz Mahdy	爱因斯唐	Gold87	JinWoo Jung	westito
Escaton615	mdeleau	Thies Lennart Alff	Matteo T.

Acknowledgement #

• gocv project: https://github.com/hybridgroup/gocv License: Apache-2.0

Star History #

License #

Apache-2.0 License