Obtaining the effective contour from an image taken by fisheye lens is important for the following transactions. Many studies try to develop suitable methods to get accurate contours of fisheye images. Using the traditional level set method (CV model) is hard to meet the desire task that the final segmentation region is a circle. Therefore, the preprocessing of fisheye images and the improvement of traditional level set method are redesigned to get a final circular segmentation which may be suitable to other applications. In this paper, we use the local entropy method to make the value of pixels be even inside the effective circular region, further threshold method to remove the hole(s), and at last the explicit circular level set method to get final segmentation. The final experimental results show that the segmentation is effective.
Xuegang Wu, Zhijun Qiao, "An effective method to obtain contour of fisheye images based on explicit level set method," Proc. SPIE 11395, Big Data II: Learning, Analytics, and Applications, 113950J (18 May 2020); doi:10.1117/12.2560764
Proceedings Volume 11395, Big Data II: Learning, Analytics, and Applications