CircleFinder

A Java Program for detecting circles within a given image by using Circle Hough Transform (CHT).

It displays on screen the given image with detected circles highlighted in red.
It also stores to the project /result directory (automatically created):

• the gray-scale image (gray.png)
• the blurred image (blur.png)
• the sobel image (sobel.png)
• the image with pixels above threshold (aboveThreshold.png)
• the image with detected circles (detectedCircles.png).

Based on:

• https://en.wikipedia.org/wiki/Circle_Hough_Transform
• https://github.com/lukemccl/CircleDetection

How-To-Use

1. Open a terminal in the project directory
   

2. Compile Java source code by running:
   javac -cp . *.java
   

3. Run the Main program by running:
   java -cp . Main imagePath [circles] [threshold] [minRadius] [maxRadius]

   Arguments:

   • imagePath (required): path of the image file.
   • circles (optional): number of circles to detect. Default: 1.
   • threshold (optional): threshold for Sobel Operator. Default: 150.
   • minRadius (optional): minimum radius of circles (in px). Default: 10.
   • maxRadius (optional): maximum radius of circles (in px). Default: 100.