Automatic Estimation of Spatially Varying Focal Length for Correcting Distortion in Fisheye Lens Images
Hyungtae Kim, Daehee Kim, Joonki Paik · IEIE Transactions on Smart Processing and Computing · 2013
This paper presents an automatic focal length estimation method to correct the fisheye lens distortion in a spatially adaptive manner. The proposed method estimates the focal length of the fisheye lens by generating two reference focal lengths. The distorted fisheye lens image is finally corrected using the orthographic projection model. The experimental results showed that the proposed focal length estimation method is more accurate than existing methods in terms of the loss rate.