| 图像水印的信道容量模型及其估算 |
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| 引用本文： | 傅瑜,王卫卫. 图像水印的信道容量模型及其估算[J]. 微电子学与计算机, 2003, 20(1): 8-10 |
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| 作者姓名： | 傅瑜 王卫卫 |
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| 作者单位： | 1. 电子科技大学中山学院,中山,528403
2. 西安电子科技大学理学院,西安,710071 |
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| 基金项目： | 广东省中山市科技基金资助项目(2001A035) |
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| 摘 要： | 运用信息论的基本原理来估计一幅图像中可以嵌入的信息量，就是水印信道的理论容量问题。文章首先给出了水印信道的模型，然后分析了DCT系数的分布特点并从理论上估计了水印信道的容量，最后给出了相应的实验结果。
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| 关 键 词： | 图像水印 信道容量模型 估算 数字水印 DCT系数 图像处理 信息论 信息隐藏学 |
A Model of Watermarking Channel Capacity and its Estimation for Images |
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| FU Yu. A Model of Watermarking Channel Capacity and its Estimation for Images[J]. Microelectronics & Computer, 2003, 20(1): 8-10 |
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| Authors: | FU Yu |
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| Abstract: | Digital watermarking technology has evolved very quickly during the last few years.Most watermarking research are focused on the algori thms of water-marking signal de-sign,em-bedding and recovery,but a few on some key problems such as the theoretical ca-pacity of image.In this paper ,a model of wa-termarking channel is intro-duced as a commu-nication system ,and the distribution characteristic of still image DCT co-efficients is ana-lyzed then.Accord-ing to basic princi-ple of information theo-ry,the capaci-ty of watermarking channel is evaluat-ed by means of embedding water-marks t o selected still image DCT co-efficients in direct spread spectrum.Finally,th eoretical expressions are con-trasted with ex-periment results. |
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| Keywords: | D igital watermark Channel capacity DCT coeffi-cients |
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