An Effective Authenticating Method On The Compressed Image Data
An Effective Authenticating Method On The Compressed Image Data
复制标题
一种有效的压缩图像数据认证方法
DOI：
10.1109/icicic.2006.43
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Chung
中科院分区：
文献类型：
--
作者：
Tsong;Da;Chao;Chung
在本文中，我们提出了一个有效的水印方法，致力于认证的压缩图像数据。利用JPEG压缩数据的特点，我们比较量化和非量化的DCT系数，找到嵌入位置。采用块分类策略将8 × 8DCT块分为关键块和平坦块，以将不同的水印隐藏到上述位置。实验结果表明，该方法对压缩比为75%~ 90%的JPEG图像具有较好的压缩效果，嵌入水印后图像的峰值信噪比（PSNR）仍保持在37 dB以上，且仅增加了少量的码流开销
In this paper, we propose an effective watermarking method dedicated to authenticating the compressed image data. By exploiting the characteristics of JPEG compressed data, we compare the quantized with the non-quantized DCT coefficients for finding the embedding positions. A block-classification strategy is used for classifying 8 times 8 DCT blocks into key-blocks and flat-blocks in order to hide different watermarks into the positions mentioned above. Experimental results show that the efficacy of the proposed approach for JPEG images with about 75% to 90% compression ratio and the watermarked image still maintains a PSNR over 37dB, and only a slight overhead in bit-streams is introduced