In this paper, we propose a novel data hiding algorithm for high dynamic range (HDR) images
encoded by the OpenEXR file format. The proposed algorithm exploits each of three 10-bit mantissa fields as an
embedding unit in order to conceal k bits of a secret message using an optimal base which produces the least
pixel variation. An aggressive bit encoding and decomposition scheme is recommended, which offers a high
probability to convey (k+1) bits without increasing pixel variation caused by message concealment. In addition,
we present a bit inversion embedding strategy to further increase the capacities.The generated stego HDR
images and their tone-mapped low dynamic range (LDR) images reveal no perceptual differences when
subjected to quantitative testing by Visual Difference Predictor.
Keywords:high dynamic range images, data hiding, OpenEXR, adaptive, optimal base, Visual Difference
Predictor
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