Edge Detection using Erosion

Introduction

Given an image with white foreground color & black background color,

• Gray scale given image, to be safe, if user given color image
• Erode image by applying erosion for one time
• Subtract the eroded image from gray scaled one, and you’ve edge detected image.

Make sure, given image is having rgb(255, 255, 255) as foreground color, otherwise erosion will not work as expected, resulting into failed edge detection op.

Usage

• Code for edge detection using erosion as basic op.

import in.itzmeanjan.filterit.ImportExportImage;
import in.itzmeanjan.filterit.edgedetection.EdgeDetectionUsingErosion;


public class Main{

	public static void main(String [] args){
		System.out.println(
            ImportExportImage.exportImage(
                new EdgeDetectionUsingErosion().detect("moon.jpg"),
                 "edgeDetected.jpg"));
	}

}

• Make sure you’ve downloaded in.itzmeanjan.filterit.jar & added it as project dependency.

Result

Source	Edge Detected

Thanking you :blush: