OpenCV - SQRBox Filter


You can perform the SQRBox Filter operation on an image using the boxFilter() method of the imgproc class. Following is the syntax of this method −

sqrBoxFilter(src, dst, ddepth, ksize)

This method accepts the following parameters −

  • src − A Mat object representing the source (input image) for this operation.

  • dst − A Mat object representing the destination (output image) for this operation.

  • ddepth − A variable of the type integer representing the depth of the output image.

  • ksize − A Size object representing the size of the blurring kernel.


The following program demonstrates how to perform Sqrbox filter operation on a given image.

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 SqrBoxFilterTest {
   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 ="E:/OpenCV/chap11/filter_input.jpg";
      Mat src = Imgcodecs.imread(file);

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

      // Applying Box Filter effect on the Image
      Imgproc.sqrBoxFilter(src, dst, -1, new Size(1, 1));
      // Writing the image
      Imgcodecs.imwrite("E:/OpenCV/chap11/sqrboxfilter.jpg", dst);

      System.out.println("Image Processed");

Assume that following is the input image filter_input.jpg specified in the above program.

Filter Input


On executing the program, you will get the following output −

Image Processed

If you open the specified path, you can observe the output image as follows −

SQRBox Filter