Transform Domain based Steganographic Technique for Image Authentication (TDSTIA)

Nabin Ghoshal


The paper proposed a novel steganographic technique based on Discrete Cosine Transform (DCT) for multimedia copyright protection in frequency domain. The transformation is implemented on sub-image block called mask of size 2 x 2 of spatial components in row major order for the entire image. After transformation the host image gets converted into sub band images. For embedding we choose middle frequency ranges. Single bit of authenticating secret message/image is fabricated in the real part of middle frequency component of each sub-image block. A minor re-adjustment is incorporated in the first component of each mask after embedding to keep the pixel values positive and non fractional in spatial domain. This approach improves the performance of the Steganographic technique compared to earlier techniques. Robustness is achieved through embedding secrete bits in variable positions of the carrier image byte determined by pseudo random value and subsequent masking. Experimental results depict enhanced performance of the proposed watermarking technique in terms of PSNR, IF, and MSE.

Keywords: QFT, DFT, DCT, MD and TDSTIA

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