LogLuv encoding for full-gamut, high-dynamic range images
Journal of Graphics Tools
Photographic tone reproduction for digital images
Proceedings of the 29th annual conference on Computer graphics and interactive techniques
Perception-motivated high dynamic range video encoding
ACM SIGGRAPH 2004 Papers
Evaluation of tone mapping operators using a High Dynamic Range display
ACM SIGGRAPH 2005 Papers
Backward compatible high dynamic range MPEG video compression
ACM SIGGRAPH 2006 Papers
A GPU-friendly method for high dynamic range texture compression using inverse tone mapping
GI '08 Proceedings of graphics interface 2008
Advanced High Dynamic Range Imaging: Theory and Practice
Advanced High Dynamic Range Imaging: Theory and Practice
Optimizing a Tone Curve for Backward-Compatible High Dynamic Range Image and Video Compression
IEEE Transactions on Image Processing
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Backward compatibility for high dynamic range image and video compression forms one of the essential requirements in the transition phase from low dynamic range (LDR) displays to high dynamic range (HDR) displays. In a recent work [1], the problems of tone mapping and HDR video coding are originally fused together in the same mathematical framework, and an optimized solution for tone mapping is achieved in terms of the mean square error (MSE) of the logarithm of luminance values. In this paper, we improve this pioneer study in three aspects by considering its three shortcomings. First, the proposed method [1] works over the logarithms of luminance values which are not uniform with respect to Human Visual System (HVS) sensitivity. We propose to use the perceptually uniform luminance values as an alternative for the optimization of tone mapping curve. Second, the proposed method [1] does not take the quality of the resulting tone mapped images into account during the formulation in contrary to the main goal of tone mapping research. We include the LDR image quality as a constraint to the optimization problem and develop a generic methodology to compromise the trade-off between HDR and LDR image qualities for coding. Third, the proposed method [1] simply applies a low-pass filter to the generated tone curves for video frames to avoid flickering during the adaptation of the method to the video. We instead include an HVS based flickering constraint to the optimization and derive a methodology to compromise the trade-off between the rate-distortion performance and flickering distortion. The superiority of the proposed methodologies is verified with experiments on HDR images and video sequences.