@pickupp/react-native-opencv

Getting started

$ npm install @pickupp/react-native-opencv --save

Mostly automatic installation

$ react-native link @pickupp/react-native-opencv

Prerequisite

You can directly install the package but it will take a while for downloading the sdk required, you can download the sdk first and create a enviornment variable export OPENCV_ANDROID_SDK=/path/to/sdk

Manual installation

iOS

1. In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
2. Go to node_modules ➜ @pickupp/react-native-opencv and add RNOpenCV.xcodeproj
3. In XCode, in the project navigator, select your project. Add libRNOpenCV.a to your project's Build Phases ➜ Link Binary With Libraries
4. Run your project (Cmd+R)<

Android

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import io.pickupp.recatnativeopencv.RNOpenCVPackage; to the imports at the top of the file
• Add new RNOpenCVPackage() to the list returned by the getPackages() method
  • Add

     import org.opencv.android.BaseLoaderCallback;
     import org.opencv.android.LoaderCallbackInterface;
     import org.opencv.android.OpenCVLoader;
    

  • Add

     	private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
     		@Override
     		public void onManagerConnected(int status) {
     			switch (status) {
     				case LoaderCallbackInterface.SUCCESS:
     				{
     					Log.i("OpenCV", "OpenCV loaded successfully");
     				} break;
     				default:
     				{
     					super.onManagerConnected(status);
     				} break;
     			}
     		}
     	};
    
     	public void onCreate() {
     		super.onCreate();
     		if (!OpenCVLoader.initDebug()) {
     			Log.d("OpenCv", "Error while init");
     		}
     	}
    
     	public void onResume()
     	{
     		if (!OpenCVLoader.initDebug()) {
     			Log.d("OpenCV", "Internal OpenCV library not found. Using OpenCV Manager for initialization");
     			OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
     		} else {
     			Log.d("OpenCV", "OpenCV library found inside package. Using it!");
     			mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
     		}
     	}
    

2. Append the following lines to android/settings.gradle:

   include ':react-native-opencv'
   project(':react-native-opencv').projectDir = new File(rootProject.projectDir, 	'../node_modules/@pickupp/react-native-opencv/android')
   	include ':opencv-android-sdk'
   	project(':opencv-android-sdk').projectDir = new File(rootProject.projectDir, '../node_modules/@pickupp/react-native-opencv/android/libraries/opencv')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     implementation project(':react-native-opencv')
   		implementation project(':opencv-android-sdk')
   

4. Insert the following lines inside the android block andriod.app/build.gradle sourceSets.main { // include opencv native jni jniLibs.srcDir '../../node_modules/@pickupp/react-native-opencv/android/libraries/opencv/jniLibs' jni.srcDirs = [] //disable automatic ndk-build call }

Usage

import RNOpenCV from '@pickupp/react-native-opencv';

const maxEdgeLength = await RNOpenCV.findMaxEdge(/* base64ImageString */)
const laplacianScore = await RNOpenCV.laplacianBlurryCheck(/* base64ImageString */)