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Noise bias compensation for tone mapped noisy image using prior knowledge

  • Sayaka Minewaki (a1), Taichi Yoshida (a2), Yoshinori Takei (a3), Masahiro Iwahashi (a4) and Hitoshi Kiya (a5)...

Abstract

A large number of studies have been made on denoising of a digital noisy image. In regression filters, a convolution kernel was determined based on the spatial distance or the photometric distance. In non-local mean (NLM) filters, pixel-wise calculation of the distance was replaced with patch-wise one. Later on, NLM filters have been developed to be adaptive to the local statistics of an image with introduction of the prior knowledge in a Bayesian framework. Unlike those existing approaches, we introduce the prior knowledge, not on the local patch in NLM filters but, on the noise bias (NB) which has not been utilized so far. Although the mean of noise is assumed to be zero before tone mapping (TM), it becomes non-zero value after TM due to the non-linearity of TM. Utilizing this fact, we propose a new denoising method for a tone mapped noisy image. In this method, pixels in the noisy image are classified into several subsets according to the observed pixel value, and the pixel values in each subset are compensated based on the prior knowledge so that NB of the subset becomes close to zero. As a result of experiments, effectiveness of the proposed method is confirmed.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Sayaka MINEWAKI Email: minewaki@info.yuge.ac.jp

References

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Keywords

Noise bias compensation for tone mapped noisy image using prior knowledge

  • Sayaka Minewaki (a1), Taichi Yoshida (a2), Yoshinori Takei (a3), Masahiro Iwahashi (a4) and Hitoshi Kiya (a5)...

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