| 基于菱形编码和修改量化表的DCT域图像隐写 |
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| 引用本文： | 金 涛,何加铭,杨任尔.基于菱形编码和修改量化表的DCT域图像隐写[J].宁波大学学报(理工版),2014(1):33-36. |
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| 作者姓名： | 金 涛 何加铭 杨任尔 |
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| 作者单位： | 宁波大学信息科学与工程学院,浙江宁波315211 |
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| 基金项目： | 浙江省移动网络应用技术重点实验室项目（2010E10005）;浙江省新一代移动互联网用户端软件科技创新团队项目（2010R50009）浙江省重点科技创新团队项目（2012R10009-11,2012R10009-20）;浙江省重大科技专项重点工业项目（2011C11042）. |
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| 摘 要： | 为了提高离散余弦变换(DCT)域隐写的嵌入容量,提出一种基于菱形编码和修改量化表的DCT域图像隐写.首先将载体图像进行8×8的DCT变换后,对变换得到的DCT系数采用修改的8×8量化表进行量化,从而提高了嵌入容量和载密图像的视觉质量.同时通过改进的菱形编码将8进制的秘密信息嵌入到载体图像量化DCT系数的中频部分,从而进一步提高了嵌入容量.实验结果表明:该隐写算法不但与JPEG压缩标准兼容,而且有效地提高了嵌入容量.
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| 关 键 词： | 隐写 离散余弦变换 菱形编码 量化 |
Image Steganography Based on Diamond Encoding and Quantization Table Modification in DCT Domain |
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| JIN Tao,HE Jia-ming,YANG Ren-er.Image Steganography Based on Diamond Encoding and Quantization Table Modification in DCT Domain[J].Journal of Ningbo University(Natural Science and Engineering Edition),2014(1):33-36. |
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| Authors: | JIN Tao HE Jia-ming YANG Ren-er |
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| Institution: | ( Faculty of Information Science and Technology, Ningbo University, Ningbo 315211, China ) |
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| Abstract: | In order to improve embedding capacity of steganography in discrete cosine transform （DCT） Domain, a new image steganography is proposed based on the diamond encoding and quantization table modification. Firstly, the carrier image is transformed by 8×8 block DCT, then the DCT coefficients are quantized using the modified 8×8 quantification table, which increases the embedding capacity and steno-image visual quality. The 8-ary secret image data are embedded in the middle-band of frequency of the carrier image＇s DCT coefficients using the modified diamond encoding, then the embedding capacity can thus be further improved. The experimental results show that the proposed method not only maintains good imperceptibility of image after embedding large amount of secret message, but also effectively improves the embedding capacity as well. |
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| Keywords: | steganography DCT diamond encoding quantification |
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