Java Examples - Scale an Image

Problem Description

How to scale an image using Java.


Following is the program to scale an image using Java.

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Size;

import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class ScalingAnImage {
   public static void main(String args[]) { 
      //Loading the OpenCV core library
      System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
      //Reading the Image from the file and storing it in to a Matrix object
      String file = "C:/opencv/logo.jpg";
      Mat src = Imgcodecs.imread(file);

      //Creating an empty matrix to store the result
      Mat dst = new Mat();

      //Scaling the Image
      Imgproc.resize(src, dst, new Size(src.rows()/3, src.rows()/3), 0, 0, 

      //Writing the image
      Imgcodecs.imwrite("C:/opencv/scale_output.jpg", dst);
      System.out.println("Image Processed");


OpenCV Copy Input


Scale Output