Single-Image Vignetting Correction from Gradient Distribution Symmetries

@article{Zheng2013SingleImageVC,
  title={Single-Image Vignetting Correction from Gradient Distribution Symmetries},
  author={Yuanjie Zheng and Stephen Lin and Sing Bing Kang and Rui Xiao and James C. Gee and Chandra Kambhamettu},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence},
  year={2013},
  volume={35},
  pages={1480-1494}
}
We present novel techniques for single-image vignetting correction based on symmetries of two forms of image gradients: semicircular tangential gradients (SCTG) and radial gradients (RG). For a given image pixel, an SCTG is an image gradient along the tangential direction of a circle centered at the presumed optical center and passing through the pixel. An RG is an image gradient along the radial direction with respect to the optical center. We observe that the symmetry properties of SCTG and… CONTINUE READING
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