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A nonlinear quantization scheme for two-layer HDR image encoding

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Abstract

Two-layer schemes provide an effective method of encoding high dynamic range images with backward compatibility. The first layer is the tone-mapped low dynamic range version of the original image, used for visualization. The residual information that cannot be preserved in the first layer is stored in the second layer, which itself is generally encoded as an image of a fixed bit-depth. Any further details that cannot be preserved in the second layer are discarded. In this paper, we present a nonlinear quantization algorithm that can significantly enhance the amount of details that can be preserved in the second layer, and therefore improve the encoding efficiency. The proposed technique can be incorporated in any existing two-layer encoding method and leads to significant improvement in their performance.

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Acknowledgments

This work was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under grant No. (611-398-D1435). The authors, therefore, acknowledge with thanks DSR technical and financial support.

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Correspondence to Ishtiaq Rasool Khan.

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Khan, I.R. A nonlinear quantization scheme for two-layer HDR image encoding. SIViP 10, 921–926 (2016). https://doi.org/10.1007/s11760-015-0841-x

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  • DOI: https://doi.org/10.1007/s11760-015-0841-x

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