Eun Suk Park, Jong Won Woo, Seok Hee Lee, Yun Seok Heo, Ki Hyung Cho

The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 7, No. 1, pp. 296-305, Jan. 2000
10.3745/KIPSTE.2000.7.1.296,   PDF Download:

Abstract

In this paper, we propose the method of embedding the encrypted digital watermark in quantization coefficient when we encode the image data in the process of JPEG. The proposed method is as following. After a DCT coefficient of each block is quantized, we arrange the quantization coefficient as one dimension with a zigzag scan and replace each block. By applying even-odd feature of frequency of the encrypted watermark to q quantization coefficient of some fixed domain of replaced each block and embedding it, we obtain the compressed image data by encoding after placing it in the order prior to replacement. The advantages of the proposed method here are as follow: We can embed many information keeping a secret as much as possible by using the algorithm of block replacement. We can control the amount of embedding of each use, as we embed the encrypted information by selecting some fixed domain of a quantization coefficient. We can fix the embedding data regardless of the image and the value of quantization. We verified the results by experiments and analyzed the efficiency of them in comparison with the former study.

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