Ms. Ines Bouzidi Profile

Ines Bouzidi

at National Engineering School of Tunis

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Proceedings Article | 8 February 2015 Paper

Forward and backward tone mapping of high dynamic range images based on sub band architecture

Ines Bouzidi, Azza Ouled Zaid

Proceedings Volume 9396, 939605 (2015) https://doi.org/10.1117/12.2083399

KEYWORDS: High dynamic range imaging, Image filtering, Wavelets, Lithium, Image quality, Visualization, Image processing, Linear filtering, Digital filtering, Eye

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This paper presents a novel High Dynamic Range (HDR) tone mapping (TM) system based on sub-band architecture. Standard wavelet filters of Daubechies, Symlets, Coiflets and Biorthogonal were used to estimate the proposed system performance in terms of Low Dynamic Range (LDR) image quality and reconstructed HDR image fidelity. During TM stage, the HDR image is firstly decomposed in sub-bands using symmetrical analysis-synthesis filter bank. The transform coefficients are then rescaled using a predefined gain map. The inverse Tone Mapping (iTM) stage is straightforward. Indeed, the LDR image passes through the same sub-band architecture. But, instead of reducing the dynamic range, the LDR content is boosted to an HDR representation. Moreover, in our TM sheme, we included an optimization module to select the gain map components that minimize the reconstruction error, and consequently resulting in high fidelity HDR content. Comparisons with recent state-of-the-art methods have shown that our method provides better results in terms of visual quality and HDR reconstruction fidelity using objective and subjective evaluations.

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