opencv_dart 2.0.0-dev.6

OpenCV4 bindings for Dart language and Flutter, using dart:ffi. The most complete OpenCV bindings for Dart!

opencv_dart

OpenCV Bindings for Dart Language.

Important

v2.x is prepared for Native Assets, Use only if you know what you are doing!

v2.x doesn't need to download the prebuild binaries but requires Native Assets feature, which is still experimental, see more here: https://github.com/dart-lang/sdk/issues/50565

conan and cmake are required

Usage:

for pure dart:

1. take a look at https://pub.dev/packages/opencv_dart/versions and find the latest version, e.g., 2.0.0-dev.2
2. add to your pubspec.yaml
3. dart --enable-experiment=native-assets run <path-to-your-code>

for flutter:

1. take a look at https://pub.dev/packages/opencv_dart/versions and find the latest version, e.g., 2.0.0-dev.2
2. add to your pubspec.yaml
3. flutter config --enable-native-assets
4. flutter run

Note

WIP, contributions are welcome!

• opencv_dart
  • Example
  • Supported Platforms
  • Status
    • Core Modules
    • Contrib Modules
    • Usage
      • Pure Dart
      • Flutter
    • TODO
  • Acknowledgement
  • Star History
  • License

Example

Supported Platforms

Platform	Supported	Tested	Prebuilt Binaries
Android	✅	☑️	x86_64, arm64-v8a, armeabi-v7a
iOS	✅	☑️	arm64, x64(Simulator)
Linux	✅	✅	x64
Windows	✅	✅	x64
macOS	✅	✅	x64, arm64

Status

Core Modules

module	Binding status	Test status	description
core	✅	✅	Core module
calib3d	✅	✅	Calib3D module
dnn	✅	✅	DNN module
features2d	✅	✅	Features2D module
gapi	❌	❌	GAPI module
highgui	✅	✅	HighGUI module
imgcodecs	✅	✅	ImageCodecs module
imgproc	✅	✅	ImageProc module
ml	❌	❌	ML module
objdetect	✅	✅	Object Detection module
photo	✅	✅	Photo module
stitching	☑️	☑️	Stitching module
svd	✅	✅	SVD module
video	✅	✅	Video module
videoio	✅	✅	VideoIO module

Contrib Modules

module	Binding status	Test status	description
aruco	✅	✅	ArUco module
img_hash	✅	✅	Image hashing module
cuda	❌	❌
wechat_qrcode	✅	✅
bgsegm	❌	❌
superres	❌	❌
xfeatures2d	❌	❌
ximgproc	❌	❌
xobjdetect	❌	❌
xphoto	❌	❌

• ❌ : not finished
• ☑️ : partially supported
• ✅ : finished
• modules not in the above table are not considered, contributions are welcome

Usage

Pure Dart

import 'package:opencv_dart/opencv_dart.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);
}

Flutter

see example

More examples are on the way...

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

Acknowledgement

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

Star History

License

Apache-2.0 License