Abstract
This paper presents a robust color image steganography approach for image communication over wireless communication systems. The objective of this approach is to hide three color images in one color cover image to increase the capacity of hiding as most previously published steganography approaches suffer from a capacity problem. Moreover, the investigation of wireless communication of steganography images is presented in this paper to study the sensitivity of extraction of hidden images to the channel degradation effects, which is not studied appropriately in the literature. The proposed approach depends on the Discrete Cosine and Discrete Wavelet transform. The cover image is first transformed to luminance and chrominance components for embedding the images to be hidden. The secret images are encrypted by chaotic Baker map, which is a good representative of the family of permutation-based algorithms, which tolerate the channel degradations better. The investigated wireless communication system is the Orthogonal Frequency Division Multiplexing system with channel equalization. The simulation results reveal the success of the proposed work for robust image communication.
Highlights
The idea of image steganography is hiding image in another cover image
Different approaches have been presented for image steganography based on spatial and transformed domains such as Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) [2]
M(x, y) = C(x, y) + 1P(x, y),where M is considered to be DWT coefficients of each component of YDbDr color model of modified cover image, C is DWT coefficients of (LH “Vertical details”, HL” horizontal details “,HH “diagonal details”) bands for every channel YDbDr of original cover image, P is DCT of normalized channels of RGB model for each payload image, α1 is chosen in such a way that the payload images are not visible in the steganography image
Summary
The objective of any image steganography scheme is to secure some secret images from intruders. Last image steganography approaches are widely used for securing secret data, they have problems such as capacity or the quality of steganography image or security or. Sandoval et al presented a spatial domain image steganography method by embedding data in pixel values directly [4]. This method is subjected to removal of the secret image through simple manipulations such as filters. This work is divided into two parts, The objective of the first part is performing steganography approach, which achieves high security and high capacity with keeping the quality of steganography image. The objective of the second part is studying the effect of channels through OFDM on this proposed approach
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