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This paper proposes a fast dual-layer lossless coding for high dynamic rangeimages (HDRIs) in the Radiance format. The coding, which consists of a baselayer and a lossless enhancement layer, provides a standard dynamic range image(SDRI) without requiring an additional algorithm at the decoder and canlosslessly decode the HDRI by adding the residual signals (residuals) betweenthe HDRI and SDRI to the SDRI, if desired. To suppress the dynamic range of theresiduals in the enhancement layer, the coding directly uses the mantissa andexponent information from the Radiance format. To further reduce the residualenergy, each mantissa is modeled (estimated) as a linear function, i.e., asimple linear regression, of the encoded-decoded SDRI in each region with thesame exponent. This is called simple linear regressive mantissa estimator.Experimental results show that, compared with existing methods, our codingreduces the average bitrate by approximately $1.57$-$6.68$ % and significantlyreduces the average encoder implementation time by approximately$87.13$-$98.96$ %.

Lightning-Fast Dual-Layer Lossless Coding for Radiance Format High Dynamic Range Images