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:

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

for flutter:

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

Note

WIP, contributions are welcome!

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

Example #

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);
}