【毕业论文】数学水印算法与应用.docVIP

本科生毕业论文 论文题目：数字水印算法与应用 论文摘要：数字水印技术是将具有特殊意义的信息（如版权标志等）嵌入到原始信号中，但嵌入后并不影响使用者对数字媒体在感官（视觉、听觉）上的认知，从而起到保护数字产品版权或者完整性的一种技术.数字水印根据嵌入技术的不同一般可分为空域法和变换域法.空域法就是在图像的空间域中嵌入水印的技术，最简单和有代表性的方案就是用水印的信息代替图像的最低有效位(LSB)或者多个位平面的所有比特的算法；变换域法就是对变换域中的系数（离散傅里叶变换系数、离散余弦变换系数、离散小波变换系数等）作出改变以嵌入水印信息.本选题研究的是空域法水印技术，嵌入过程是通过编码和一些简单的逻辑运算并借助MATLAB中函数alterim()和imhide()把6幅文本图像隐藏到1幅彩色图像中，与原始图像用肉眼看起来没有什么差异，所以没有人能轻易看到隐藏的文本；提取过程是通过解码、逻辑运算AND以及函数txtxtract()、imxtract()fspecial()中的滤波器Laplacealgorithm and application of digital watermarking Abstract：The digital watermark technology has the special significance information (for example, copyright to symbolize and so on) to be inserted into the primary signal , but the inserted signal does not affect the users’ cognition in the sense organ (vision, sense of hearing) to the digital media , thus the digital watermark technology is one kind of technology that can protect the copyright or the completeness of the digital production. The digital watermark generally be divided into the air zone law and the transformation territory law according to the difference of the inserting technology. The air zone law is the technology that inserts the watermark into the primary signal in the air zone domain of the image, the simple and representative plan is to replace the least significant bit (LSB) of the image with the watermark information or all bits algorithms of multi-units place plane; The transformation territory law is to make the change in the territory coefficient (separate Fourier transformation ratio, separate cosine transformation ratio, separate wavelet transformation ratio and so on) to insert the watermark information. This selected topic is to research the air zone law watermark technology, the inserting process hides 6 text images to 1 color image through the coding and some simple logic operation, also drawing support from MATLAB with function alterim() and imhide(),while the inserted image does not have difference with the primitive image with the naked ey