React Native OpenCV Tutorial

A fully working example of the OpenCV library used together with React Native.

What This Tutorial Is About

This tutorial will guide you on how to utilize React Native in collaboration with the OpenCV library for image processing tasks. By the end of this tutorial, you will learn to use native Java and Objective-C bindings for OpenCV. We will focus on using your device’s camera to capture a photo and determine whether the image is clear or blurred.

Demo

The following examples illustrate the results immediately after capturing a photo:

• Blurred Photo: 
• Clear Photo: 

Prerequisites

• XCode
• Android Studio

How to Run the Project

Follow these steps to get the project up and running:

1. Clone the repository.
2. Navigate to the cloned repository path:

cd clonedrepositorypath

3. Install necessary dependencies using:

npm i or yarn

4. Link React Native libraries:

react-native link

5. Run the script to download OpenCV:

./downloadAndInsertOpenCV.sh

6. Download the Android pack manually from OpenCV Releases (version 3.4.1).
7. Unzip the downloaded package.
8. Import OpenCV into Android Studio:
   • Go to File – New – Import Module and select the sdk/java folder from the unzipped OpenCV archive.
9. Update your imported OpenCV module’s build.gradle to reflect your project’s configuration:
   • compileSdkVersion
   • buildToolsVersion
   • minSdkVersion
   • targetSdkVersion
10. Add module dependency:
    • Navigate to Application – Module Settings, then select the Dependencies tab.
    • Click the + icon at the bottom and choose Module Dependency to select the imported OpenCV module.
11. Run the project on your simulator or device:

react-native run-ios or react-native run-android

Troubleshooting Ideas

If you encounter issues related to the downloadAndInsertOpenCV.sh script, please check the paths within the script and update them accordingly if they do not match your setup. Additionally, if the script fails to execute due to permissions, you can modify its permissions with:

chmod 777 downloadAndInsertOpenCV.sh

If you haven’t installed React Native yet, you can do so by running the following command:

npm i -g react-native-cli

For more insights, updates, or to collaborate on AI development projects, stay connected with fxis.ai.

Conclusion

In this tutorial, you have learned how to harness the power of React Native alongside OpenCV to enhance your image processing capabilities. By using the camera on your device, you can seamlessly determine the quality of images captured, thus paving the way for further processing or analysis.

At fxis.ai, we believe that such advancements are crucial for the future of AI, as they enable more comprehensive and effective solutions. Our team is continually exploring new methodologies to push the envelope in artificial intelligence, ensuring that our clients benefit from the latest technological innovations.