Improving wavelet denoising based on an in-depth analysis of the camera color processing

Tamara Seybold, Mathias Plichta, Walter Stechele

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

While Denoising is an extensively studied task in signal processing research, most denoising methods are designed and evaluated using readily processed image data, e.g. the well-known Kodak data set. The noise model is usually additive white Gaussian noise (AWGN). This kind of test data does not correspond to nowadays real-world image data taken with a digital camera. Using such unrealistic data to test, optimize and compare denoising algorithms may lead to incorrect parameter tuning or suboptimal choices in research on real-time camera denoising algorithms. In this paper we derive a precise analysis of the noise characteristics for the different steps in the color processing. Based on real camera noise measurements and simulation of the processing steps, we obtain a good approximation for the noise characteristics. We further show how this approximation can be used in standard wavelet denoising methods. We improve the wavelet hard thresholding and bivariate thresholding based on our noise analysis results. Both the visual quality and objective quality metrics show the advantage of the proposed method. As the method is implemented using look-up-tables that are calculated before the denoising step, our method can be implemented with very low computational complexity and can process HD video sequences real-time in an FPGA.

Original languageEnglish
Title of host publicationProceedings of SPIE-IS and T Electronic Imaging - Real-Time Image and Video Processing 2015
EditorsNasser Kehtarnavaz, Matthias F. Carlsohn
PublisherSPIE
ISBN (Electronic)9781628414905
DOIs
StatePublished - 2015
EventReal-Time Image and Video Processing 2015 - San Francisco, United States
Duration: 10 Feb 2015 → …

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9400
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceReal-Time Image and Video Processing 2015
Country/TerritoryUnited States
CitySan Francisco
Period10/02/15 → …

Keywords

  • camera noise
  • camera processing
  • color processing
  • denoising
  • noise analysis

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