A high capacity steganographic method based on quantization table modification |
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Authors: | Cuiling Jiang Yilin Pang Lun Guo Bing Jing Xiangyu Gong |
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Affiliation: | JIANG Cuiling,PANG Yilin,GUO Lun,JING Bing,GONG Xiangyu School of Information Science and Engineering,East China University of Science and Technology,Shanghai 200237,China |
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Abstract: | For the traditional steganographic method of Jsteg, the emmbedment of secret message is completed by dividing cover-image into nonoverlapping blocks of 8×8 pixels, discrete cosine transform (DCT) transforming, and using the standard 8×8 quantization table to quantize. In this paper, a novel steganographic method based on the JPEG quantization table modification is presented. Instead of dividing cover-image into 8×8 blocks, nonoverlapping blocks of 16×16 pixels is used. Both theoretical anlysis and experiment results show that the new methods has larger steganography capacity and better stego-image quality, compared with the method of Jsteg and Chang’s. |
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Keywords: | information hiding steganography steganography capacity quantization table modification |
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