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Volume: 28 | Article ID: art00003
A Novel Adaptive Shading Correction Algorithm for Camera Systems
  DOI :  10.2352/ISSN.2470-1173.2016.18.DPMI-249  Published OnlineFebruary 2016

Lens Vignetting is a common distortion in imaging systems where the intensity of the image decreases gradually away from the image center. Incorrect compensation of this luminance degradation often results in a more disturbing artifact called color shading, where the resulting image is left with shades of different colors. This paper presents a novel adaptive technique to compensate for lens Vignetting, while preserving color saturation and eliminating the need for per-unit calibration. As a consequence, the performance of automatic white balance algorithms have also been improved. The proposed algorithm is lightweight and realizable on FPGA architecture for real time Vignetting correction. The experimental results indicate a significant improvement in the quality of the corrected images. It is expected that the proposed algorithm will be implemented on mobile Image Signal Processors (ISPs) in the near future.

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Varuna De Silva, Viacheslav Chesnokov, Daniel Larkin, "A Novel Adaptive Shading Correction Algorithm for Camera Systemsin Proc. IS&T Int’l. Symp. on Electronic Imaging: Digital Photography and Mobile Imaging XII,  2016,

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