HDR based steganographic algorithm

The paper introduces a novel approach in steganography based on high dynamic range (HDR) images. Our algorithm employs a two-stage image enhancement/preservation, HDR optimization and smart LSB pixel mapping and data rearrangement [1] in order to produce a robust steganographic image, inconspicuous to both human and computerized analysis. In steganography, reliability represents the degree of resistance to computerized detection algorithms (steganalysis). In order to provide intrinsic resistance to statistical, visual or logical steganalysis, we use a different approach in embedding data as compared to the majority of the steganographic algorithms [3-9]. Using a set of low dynamic-range (LDR) images originating from the main HDR input (with different exposure levels), the secret data can be reliably embedded using smart LSB pixel mapping [1] and select the best set of LDR images that will be chosen to be joined later in the resulting HDR steganographic image. This innovative approach combines the quality obtained using smart LSB pixel mapping and data rearrangement technique [1] with the logical, visual and statistical imperceptibility degree introduced by this algorithm, therefore building a more robust and reliable steganographic model.