High-quality Ellipse Detection

1. Illustration

• This is the source code for the paper High-quality Ellipse Detection Based on Arc-support Line Segments.
• The main contribution of the proposed ellipse detector is to both accurately and efficiently detect ellipses in images, which is universally considered as a tough and long-standing problem in ellipse detection field. The proposed ellipse detector owns the features of high localization accuracy, efficiency, robustness, and stability, which comprehensively yields high-quality ellipse detection performance in front of real-world images.
• There are only two extrinsic parameters, namely the elliptic angular coverage Tac and the ratio of support inliers Tr, which enables the proposed ellipse detector to be conveniently used and applied in real applications. In addition, the specified_polarity option can help users find the polarity-specific ellipses in the image.
• The source code is free for academic use. Please cite our paper if you use the source code, thanks.

2. Requirements

• MATLAB
• OpenCV (Version 2.4.9)
• 64-bit Windows Operating System

3. How to use

• Firstly, compile the file "generateEllipseCandidates.cpp" in MATLAB on your computer to generate the mex file "generateEllipseCandidates.mexw64" with the following command:

  ---

  mex generateEllipseCandidates.cpp -IF:\OpenCV\opencv2.4.9\build\include -IF:\OpenCV\opencv2.4.9\build\include\opencv -IF:\OpenCV\opencv2.4.9\build\include\opencv2 -LF:\OpenCV\opencv2.4.9\build\x64\vc11\lib -IF:\Matlab\settlein\extern\include -LF:\Matlab\settlein\extern\lib\win64\microsoft -lopencv_core249 -lopencv_highgui249 -lopencv_imgproc249 -llibmwlapack.lib

  ---

  Notably, the corresponding software paths of OpenCV and MATLAB, namely the "F:\OpenCV\opencv2.4.9" and "F:\Matlab\settlein", should be replaced to your own.

• Secondly, run the demo file "LCS_ellipse.m".

4. Examples

Some high-quality ellipse detection examples run with default parameters and on the same computer with Intel Core i7-7500U 2.7GHz CPU and 8 GB memory

4.1 Detecting all ellipses in the image

---

• The number of detected ellipses: 4; Running time: 0.090s; Resolution: 651 x 436

---

• The number of detected ellipses: 25; Running time: 0.460s; Resolution: 720 x 435

---

• The number of detected ellipses: 3; Running time: 0.060s; Resolution: 512 x 456

---

• The number of detected ellipses: 8; Running time: 0.110s; Resolution: 752 x 525

4.2 Detecting the ellipses with positive polarity

• The number of detected ellipses: 4; Running time: 0.080s; Resolution: 752 x 525

4.3 Detecting the ellipses with negative polarity

• The number of detected ellipses: 4; Running time: 0.086s; Resolution: 752 x 525

5. Successful Application Cases

• Car Wheel Hub Recognition
• PCB Inspection
• Object Fingerprinting
• Robot Vision

6. Citation

@article{Lu2018Highquality,
  title     = {High-quality Ellipse Detection Based on Arc-support Line Segments},
  author    = {Lu, Changsheng and Xia, Siyu and Shao, Ming and Fu, Yun},
  journal   = {arXiv preprint arXiv:1810.03243},
  Year = {2018}
}