Added OpenCv Utility class, with a method for resizing a giving Mat.

app/src/main/java/com/aluxoft/earrecognition/utils/OpenCvUtils.java

+package com.aluxoft.earrecognition.utils;
+
+import org.opencv.core.Mat;
+import org.opencv.core.Size;
+import org.opencv.imgproc.Imgproc;
+
+/**
+ * Created by josejuliomartinez on 08/10/15.
+ */
+public class OpenCvUtils {
+
+    public static void resizeMat(Mat image, double maxWidth, double maxHeight) {
+        if (image.width() <= maxWidth && image.height() <= maxHeight) {
+            return;
+        }
+
+        double ratio = (double)image.width() / (double)image.height();
+        double width, height;
+        if (ratio > 1) {
+            width = maxWidth;
+            height = maxWidth * ((double)image.height()/(double)image.width());
+        } else {
+            height = maxHeight;
+            width = maxHeight* ratio;
+        }
+        Imgproc.resize(image, image, new Size(width, height));
+    }
+
+
+    private OpenCvUtils() {
+
+    }
+
+}