opencv_dart

OpenCV Bindings for Dart Language. Support both asynchronous and synchronous!

Package	Link	Description
	dartcv4	OpenCV bindings for Dart Language.
	opencv_core	OpenCV for Flutter, without videoio
	opencv_dart	OpenCV for Flutter, with all modules

Note

WIP, APIs may change in the future, contributions are welcome!

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

Demos

Screenshot	Link
	example
	videoio texture renderer
	DNN MNIST inference
	stitching
	camera
	videoio

Supported Platforms

Platform	Supported	Tested	Platforms
Android	✅	✅	x86_64, arm64-v8a, armeabi-v7a
iOS	✅	✅	arm64, x64(Simulator)
Linux	✅	✅	x64, arm64
Windows	✅	✅	x64, arm64
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	❌	❌
quality	✅	✅

• ❌ : not finished
• ☑️ : partially supported
• ✅ : finished
• modules not in the above table are not considered, contributions are welcome
• videoio: cv.VideoCapture from file is not supported yet supported now.

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, cv.COLOR_BGR2GRAY);
  print("${img.rows}, ${img.cols}");

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

Flutter

see awesome-opencv_dart and share yours

TODO

• compile libs for android, linux
• support for iOS, macOS
• add more examples
• documentation
• modify C wrapper to catch exceptions
• Native Assets, see native-assets branch
• 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