Radial Bright Channel Prior for Single Image Vignetting Correction

Hojin Cho, Hyunjoon Lee, Seungyong Lee

Abstract:

This paper presents a novel prior, radial bright channel (RBC)
prior, for single image vignetting correction. The RBC prior is derived
from a statistical property of vignetting-free images: for the pixels shar-
ing the same radius in polar coordinates of an image, at least one pixel
has a high intensity value at some color channel. Exploiting the prior, we
can eectively estimate and correct the vignetting eect of a given image.
We represent the vignetting eect as an 1D function of the distance from
the optical center, and estimate the function using the RBC prior. As it
works completely in 1D, our method provides high eciency in terms of
computation and storage costs. Experimental results demonstrate that
our method runs an order of magnitude faster than previous work, while
producing higher quality results of vignetting correction.