CircleHough

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

It displays and stores to the project /results 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 in red (detectedCircles.png).

Based on:

• https://en.wikipedia.org/wiki/Circle_Hough_Transform
• https://github.com/danilomodica/CircleFinder

How-To-Use

1. Open a terminal in the project directory
   

2. Compile Java source code by running:
   make
   

3. Run the Main program by running:
   java circleHough.Main imagePath [sobelThreshold] [minRadius] [maxRadius] [circleThreshold]

   Arguments:

   • imagePath (required): path of the image file.
   • sobelThreshold (optional): is the threshold for the sobel filter, used to discard useless details . Default: 150.
   • minRadius (optional): minimum radius of the circles to be detected (in px). Default: 10.
   • maxRadius (optional): maximum radius of the circles to be detected (in px). Default: 100.
   • circles (optional): number of detected circles to print. Default: 1.