react-native-opencv3

Getting started

$ npm install react-native-opencv3 --save

Mostly automatic installation Android

$ react-native link react-native-opencv3

Mostly automatic installation iOS

Add to Podfile ->

pod 'RNOpencv3', :podspec => '../node_modules/react-native-opencv3/ios/RNOpencv3.podspec'

$ pod install

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 ➜ react-native-opencv3 and add RNOpencv3.xcodeproj
3. In XCode, in the project navigator, select your project. Add libRNOpencv3.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 org.opencvport.RNOpencv3Package; to the imports at the top of the file
• Add new RNOpencv3Package() to the list returned by the getPackages() method

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

   include ':react-native-opencv3'
   project(':react-native-opencv3').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-opencv3/android')
   

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

     compile project(':react-native-opencv3')
   

Usage

import {RNCv} from 'react-native-opencv3';

// Basic convert input jpg or png to grayscale
RNCv.cvtColorGray(inFile, outFile)
.then((image) => {
  const { width, height, uri } = image
  console.log('width is: ' + width + 'height is: ' + height + ' uri is: ' + uri)
})
.error((err) => {
  console.error(err)
})

CvCamera Usage

import React, {Component} from 'react';
import {StyleSheet, View} from 'react-native';
import {CvCamera} from 'react-native-opencv3';

type Props = {};
export default class App extends Component<Props> {
  render() {
    const { type } = 'back';
    return (
      <View
        style={styles.preview}
      >
        <CvCamera
          style={styles.preview}
          type={type}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  preview: {
    flex: 1
  },
});