Implement the EarFeature class, adding the basics from the SIFT detector.

app/src/main/java/com/aluxoft/earrecognition/common/EarFeature.java

 package com.aluxoft.earrecognition.common;
 
+import com.google.gson.Gson;
+
+import org.opencv.core.Mat;
+
+import java.util.ArrayList;
+
 /**
  * Created by josejuliomartinez on 06/10/15.
  * Store the features of the ear.
  */
-abstract public class EarFeature implements Comparable {
+public class EarFeature {
+
+    private Mat features;
+
+    public Mat getFeatures() {
+        return features;
+    }
+
+    public void setFeatures(Mat features) {
+        this.features = features;
+    }
+
+    public EarFeature(Mat features) {
+        this.setFeatures(features);
+    }
+
+    public String serializeFeatures() {
+        Mat mFeatures = this.getFeatures();
+
+        ArrayList<ArrayList<Integer>> features = new ArrayList<>();
+        for (int i=0;i<mFeatures.rows();++i) {
+            ArrayList<Integer> feature = new ArrayList<>();
+            for (int j=0;j<mFeatures.cols();++j) {
+                feature.add((int)mFeatures.get(i, j)[0]);
+            }
+            features.add(feature);
+        }
+        Gson gson = new Gson();
+        return gson.toJson(features);
+    }
 
 }