Package detailsv2.2.2

opencv_dart

OpenCV4 bindings for Flutter, using dart:ffi.

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pub.dev API documentation Source code

30-day downloads: 17.5K
Likes: 137
Pub points: 140

Install package

flutter pub add opencv_dart

Package Overview

Package selection guidance compiled from public package information, community data, and project usage.

opencv_dart provides OpenCV4 bindings for Flutter using dart:ffi, enabling computer vision and image processing capabilities in cross-platform applications. It allows developers to leverage OpenCV's extensive library of algorithms—such as image filtering, object detection, and feature extraction—directly within Flutter apps on Android, iOS, macOS, Windows, and Linux. The package bridges native OpenCV functionality with Dart code, offering high performance through direct system calls. Ideal for integrating real-time camera processing, OCR, or advanced image analysis into mobile and desktop apps.

Use cases

Real-time image processing
OCR integration
Object detection
Camera-based analytics
Face recognition

Key features

Cross-platform support
Uses dart:ffi for performance
OpenCV4 compatibility
Native OpenCV function access
Lightweight wrapper

Suitable for

Flutter developers needing computer vision
Apps requiring image analysis
Mobile and desktop vision projects
Prototyping vision features
Performance-critical image processing

Considerations

Requires native OpenCV libraries
Platform-specific setup may be needed
Limited documentation
Potential size increase in app bundle
Debugging native code can be complex

Original README

Original README snapshot from the linked source repository. Visit the repository for the latest content.

opencv_dart

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

Package	Link	Description
	dartcv4	OpenCV bindings for Dart Language.
	opencv_dart	OpenCV for Flutter, from `2.x` , it is a wrapper of `dartcv4` to keep compatibility.

[!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	:white_check_mark:	:white_check_mark:	x86_64, arm64-v8a, armeabi-v7a
iOS	:white_check_mark:	:white_check_mark:	arm64, x64+arm64(Simulator)
Linux	:white_check_mark:	:white_check_mark:	x64, arm64
Windows	:white_check_mark:	:white_check_mark:	x64, arm64
macOS	:white_check_mark:	:white_check_mark:	x64, arm64

Status

Core Modules

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

Contrib Modules

module	Binding status	Test status	description
aruco	:white_check_mark:	:white_check_mark:	ArUco module
img_hash	:white_check_mark:	:white_check_mark:	Image hashing module
cuda	:x:	:x:
wechat_qrcode	:white_check_mark:	:white_check_mark:
bgsegm	:x:	:x:
superres	:x:	:x:
xfeatures2d	:x:	:x:
ximgproc	:white_check_mark:	:white_check_mark:
xobjdetect	:white_check_mark:	:white_check_mark:
xphoto	:x:	:x:
quality	:white_check_mark:	:white_check_mark:

:x: : not finished
:ballot_box_with_check: : partially supported
:white_check_mark: : 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

[x] ~~compile libs for android, linux~~
[x] ~~support for iOS, macOS~~
[x] ~~add more examples~~
[ ] documentation
[x] ~~modify C wrapper to catch exceptions~~
[x] Native Assets, see native-assets branch
[x] async
[x] more/full test coverage
[x] ~~directly include opencv source code, refactor cmakelists.txt~~

Contributors

_{rainy liu}	_{Abdelaziz Mahdy}	_爱因斯唐	_Gold87	_{Diego López}	_{JinWoo Jung}
_westito	_{Arnold Stark}	_{Baptiste DUPUCH}	_Escaton615	_mdeleau	_Pariterre
_{Thies Lennart Alff}	_jasaw	_{Matteo T.}