Description: Coefficients a and b control the low and high frequency ranges that the watermark affects. Because of the watermark invariant properties, we embed the watermark only in the Fourier descriptor magnitude. We use the inverse Fourier transform of the Fourier coefficients to produce the watermarked curve L . This watermarking method is also applicable in the control points of B-spline contour representations. In both polygonal curves and in B-spline curves, watermark embedding can create curve discontinuities or curve self-crossing. Platform: |
Size: 265216 |
Author:Mr Leo |
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Description: 基于傅里叶变换的数字水印算法，实现了图像里的水印的嵌入和提取。Matlab代码。-Fourier transform-based digital watermarking algorithm to achieve the image in the watermark embedding and extraction. Matlab code. Platform: |
Size: 2048 |
Author:冯桐 |
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Description: 该算法把计算出的图像不变质心作为对其进行对数极坐标变换的原
点, 再作傅立叶变换, 取出中频段幅值作为水印嵌入域。该算法具有较好的鲁棒性、可检测性, 能同时抵抗几何攻击和信号
处理攻击, 它在数字图像的版权保护等领域有广泛的应用前景。-The algorithm to calculate the heart of the image does not degenerate as the number of its polar transformation of the origin, further Fourier transform, remove the watermark embedding in the frequency domain as amplitude. The algorithm has better robustness, detectability, can also resist geometric attacks and signal processing attacks, which in the digital image copyright protection and other fields have a wide range of applications. Platform: |
Size: 228352 |
Author:切尔西 |
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Description: 图像水印的实现算法，利用离散余弦傅里叶变换，实现图像水印的潜入与提取-Image watermarking algorithm using the discrete cosine Fourier transform and image watermark to sneak into and extract Platform: |
Size: 500736 |
Author:乔仲伟 |
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Description: 分数傅里叶变化，包含完整的一维，二维，连续，离散的Matlab源码，绝对可用，如用于水印-Fractional Fourier transform, contains a complete one-dimensional, two-dimensional, continuous, discrete Matlab source code is absolutely available, such as for the watermark Platform: |
Size: 379904 |
Author:zhongyilong |
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Description: 利用傅里叶变换实现两幅大小相同的RGB图像的水印嵌入。包含水印的大小处理，水印嵌入和提取，以及对PNSR的计算。-Fourier transform two of the same size of the RGB image watermark embedding. Contains the size of the watermark processing, the watermark embedding and extraction, as well as on the PNSR the calculation. Platform: |
Size: 5120 |
Author:夏丽娟 |
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Description: 压缩包里包括：离散傅里叶变换、Zernike多项式各项的图形表示、洛伦兹曲线、TM模数值模拟、牛顿后向插值法、特征值求解、求解速率方程、小波函数增加水印、Q开关分析等等。-Compressed bundle includes: the discrete Fourier transform, Zernike polynomials each graphical representation of the Lorenz curve, the TM mode numerical simulation, Newton interpolation eigenvalue solution to solving the rate equation, wavelet function to increase the watermark Q switching analysis. Platform: |
Size: 6144 |
Author:HBMP |
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Description: 将双水印的数字全息图隐藏在载体图像的离散傅里叶变换中频系数的幅度谱中，实现最佳水印的嵌入-The double digital watermark hidden in the vector image holograms discrete Fourier transform coefficients of the amplitude frequency spectrum, the best watermark embedding Platform: |
Size: 1329152 |
Author:kitty |
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Description: 数字水印文件和数字水印命令是数字水印技术在军事应用的两个重要应用。本文以一种基于分数阶傅里叶变换
(FRFT)的数字水印算法，使用chirp信号作为水印信息，嵌入到图像的分数阶傅里叶的加密域中。该算法有效地利用水印的
嵌入位置和FRFT的阶次作为密钥的同时，还利用chirp信号在分数阶傅里叶域的特点，可以很方便的检测到水印，具有良好
的不可见性和安全性的同时，还能够抵抗很强的JPEG压缩和噪声的攻击，对剪切、滤波等操作也有一定的鲁棒性。-Watermarking files and digital watermarking command are two important applications of digital watermarking technology for military applications in. In this paper, based on fractional Fourier transform
(FRFT) digital watermarking algorithm using chirp signal as the watermark information is embedded into the image encryption fractional Fourier domain. The effective use of watermarking algorithm
FRFT embedding position and at the same time as the order of the keys, but also take advantage of the characteristics of chirp signals in fractional Fourier domain, and can easily detect the watermark, with good
Invisibility and safety, it is also highly resistant to JPEG compression and noise attacks, shear, filtering and other operations also has certain robustness. Platform: |
Size: 1003520 |
Author:baibai |
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Description: PHT矩分解。用于音频或者图像数据的极谐波变换，使音频数据在受攻击后仍能够较好的提取水印-PHT matrix decomposition.Audio frequency or image data of Fourier transform, the audio data in attack can still good after extracting the watermark Platform: |
Size: 2048 |
Author:王小草 |
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Description: 二维分数阶傅里叶变换，数字水印，盲水印，可能是我的参数没有调整好，可以提取出水印，但是效果不太好，但完全可以正常运行，如果哪个大神修正了，也请联系我(Two dimensional fractional Fourier transform, digital watermark, blind watermark, may be my parameters do not adjust well, can extract the watermark, but the effect is not very good, but completely normal operation, if any modified, please contact me) Platform: |
Size: 163840 |
Author:nep |
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Search - watermark fourier