Java Examples - Scale an Image


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Problem Description

How to scale an image using Java.

Solution

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, 
         Imgproc.INTER_AREA);

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

Input

OpenCV Copy Input

Output

Scale Output
java_opencv
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