OpenCV is an open source project that provides OpenCV android SDK to match one template against other.

These are the following steps to add OpenCv in your project :

1. First of all download Android studio from this link - https://developer.android.com/studio/index.html

2. Now download openCV android SDK from this link - https://sourceforge.net/projects/opencvlibrary/files/opencv-android/

3. Extract openCV SDK zip file

4. Open your android studio and create a sample project like openCVExample

5. Now go to file and add android module by giving path of Java folder inside openCV android SDK that would be like this : /OpenCV-android-sdk/sdk/java

6. Open module setting and go to SDK location and add Ndk development.

7. Now copy libs folder of openCV SDK i.e /OpenCV-android-sdk/sdk/native/libs inside app's main folder and rename libs folder to jniLibs.

8. Clean and build your project now.

9. Now check whether openCV is loaded or not like this :

if (!OpenCVLoader.initDebug()) {
    Log.e(" status :", " not working.");
} else {
 Log.e(" status :", " working.");
}

10. If working you can continue using openCV SDK.