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Description: 数字水印算法的matlab实现代码，已经通过matlab调试使用，运用了DCT变换-digital watermarking algorithm to achieve the Matlab code debugging through the use of Matlab, use of DCT
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Author: better |
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Description: 关于图像DCT压缩编码解码的MATLAB程序，适合初学者。希望对大家有用！-on DCT compression codec MATLAB procedures for beginners. We hope that the right useful!
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Size: 257024 |
Author: 宋亮 |
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Description: 信号与系统基础知识包括连续信号与模型、离散信号与模型；常用信号变换包括Z变换、Chirp Z变换、FFT变换、DCT变换和Hilbert变换等；离散系统结构包括IIR、FIR和Lattice结构；IIR滤波器设计包括模拟和数字低通、高通、带通与带阻滤波器设计，以及基于冲激响应不变法和双线性Z变换法的IlR滤波器设计等；FIR滤波器设计包括基于窗函数、频率抽样法和切比雪大逼近法的FIR滤波器设计；平稳信号分析包括经典功率谱估计、基于参数模型的功率谱估计和基于非参数模型的功率谱估计；非平稳信号分析包括STFT变换、Gabor展开、Wigner-Ville分布与Choi-Williams分布；非高斯信号分析包括基于非参数法的双谱估计、基于参数模型的双谱估计，以及双谱估计的应用；信号处理的GUI实现包括滤波器设计与分析的FDATool工具和滤波器设计与信号分析的SPTool工具。-signals and systems based on knowledge, including continuous signal with the model, discrete signal and model; Common signals include transform Z transform, chirp Z-transform, FFT transform. DCT and Hilbert transform; Discrete system architecture including IIR, FIR and Lattice structure; IIR filter design, including analog and digital low-pass, high-pass, band-pass and band stop filter design, Based on the impulse response of the same law and bilinear Z transform the IlR filter design; FIR filter design including on the basis of the window function, frequency sampling and snow all over the big approximation of FIR filter design; stationary signal analysis include classical power spectrum estimation, Based on the model parameters of the power spectrum estimation and non- parametric model b
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Size: 101376 |
Author: james |
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Description: 用二维离散余弦变换(DCT)进行数字水印matlab源码-two-dimensional discrete cosine transform (DCT) digital watermarking Matlab FOSS
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Size: 425984 |
Author: huanzizhao |
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Description: discret cosine transform,DCT-discret cosine transform, DCT
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Size: 674816 |
Author: qu yw |
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Description: 在matlab中实现DCT变换，对初学者有一定的用处-in Matlab achieve DCT, for beginners have a certain usefulness
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Size: 6144 |
Author: 黑卫波 |
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Description: DCT在MATLAB中的实现
试过了，可以用，有详细讲解-DCT in the MATLAB tried to achieve that can be used, explained in detail
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Size: 3072 |
Author: 王芳 |
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Description: 基于图象dct变换域的信息隐藏算法，是信息隐藏基本的算法之一-image-based Extra transform domain algorithm of information hiding, information hiding is the basic algorithm
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Size: 1024 |
Author: |
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Description: 基于对角DCT和2Dpca的matlab人脸识别源码。-right angle based on DCT and the Matlab 2Dpca Face Recognition source.
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Size: 2048 |
Author: 文滔 |
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Description: 数字图像压缩算法，基于MATLAB的数字图像压缩算法，DCT格式
-digital image compression algorithm based on MATLAB digital image compression algorithm, DCT format
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Size: 46080 |
Author: liupeng |
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Description: 包含完整的程序代码，运行了你就知道，还不错的-Contains the complete program code, and are running you will know, but also good
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Size: 3072 |
Author: 李艳芳 |
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Description: 实现基本JPEG的压缩和编码分三个步骤:
1. 首先通过DCT变换去除数据冗余；
2. 使用量化表对DCT系数进行量化；
3. 对量化后的系数进行Huffman编码。-Realize the basic JPEG compression and encoding is divided into three steps: 1. First of all, through the DCT transform to remove data redundancy 2. The use of quantization table of quantization DCT coefficients 3. Quantization coefficients after Huffman coding.
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Size: 2048 |
Author: 后果 |
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Description: matlab编写的dct变换及游程编码解码程序-matlab prepared DCT transform and run-length coding decoding procedures
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Size: 2048 |
Author: zhangmin |
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Description: dct and idct for image.matlab实现信息序列的嵌入和提取-dct and idct for image.matlab realize embedded information and extract sequence
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Size: 2048 |
Author: wubaishan |
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Description: 对任意大小的灰度图像进行zig-zag变换和反变化，或者是对DCT之后的图像进行zig-zag变换，确定其中频信息。-Any size of gray-scale images in zig-zag transform and anti-change, or is the DCT of the image after the zig-zag transform, to determine which frequency information.
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Size: 128000 |
Author: 晁文婷 |
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Description: 利用DCT域进行扩频水印的嵌入,含实验图像，和各种经典的攻击方式。可选择嵌入强度和攻击强度。利用Matlab编写-DCT domain using spread-spectrum watermark embedding, with the experimental images, and various classical attacks. The option embedded in the strength and intensity of attacks. Prepared using Matlab
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Size: 115712 |
Author: 张湛 |
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Description: 在DCT域，利用8*8分块DM方法，嵌入隐藏信息。可设置量化步长、选择各种经典的攻击方式和控制攻击强弱。返回误码率和峰值信噪比。利用Matlab编写。-In the DCT domain, the use of 8* 8 block DM methods, embedding hidden information. Quantization step size can be set to choose a variety of classic attacks and control the strength of the attack. Return to the bit error rate and peak signal to noise ratio. Prepared using Matlab.
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Size: 148480 |
Author: 张湛 |
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Description: 使用二维离散余弦变换(DCT)进行图象压缩。原始图象被转换成为8*8大小的块进行压缩和重构。 Cnum:为压缩时保留的系数的个数 MSM:均方误差压缩应该做到在最合理的近似原图象的情况下使用最少的系数。函数：dctmtx:返回一个n*n阶DCT变换 blkproc:对图象进行不同的块处理。 im2col:重排图象块为矩阵列。注意：只适用于灰度图象。-The use of two-dimensional discrete cosine transform (DCT) for image compression. Original image is converted to become the size of 8* 8 block compression and reconstruction. Cnum: reservations for the compression factor of the number of MSM: mean square error compression should be done in the most reasonable approximation of the original image using the least coefficient. Function: dctmtx: returns an n* n-order DCT transform blkproc: image processing of different blocks. im2col: rearrangement of the matrix block out images. Note: only applicable to grayscale images.
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Size: 3072 |
Author: hff |
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Description: to understand the Algorithm go to matlab help in page dct2 and idct2 to get the mathematical expression
for M = N = 8, we can calculate the most of hard values and save it as LUTs to speed up the execution
now compare our special 8X8 functions with the internal general functions
use this code:
A = int32(100*rand(8,8))
tic for i = 1 : 1000 IDCT_8X8(DCT_8X8(A)) end toc
tic for i = 1 : 1000 idct2(dct2(A)) end toc
i had built the general functions too, but with low speed -to understand the Algorithm go to matlab help in page dct2 and idct2 to get the mathematical expressionfor M = N = 8, we can calculate the most of hard values and save it as LUTs to speed up the executionnow compare our special 8X8 functions with the internal general functionsuse this code: A = int32 (100* rand (8,8)) tic for i = 1: 1000 IDCT_8X8 (DCT_8X8 (A)) end toc tic for i = 1: 1000 idct2 (dct2 (A)) end toc i had built the general functions too, but with low speed
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Size: 1024 |
Author: hujik |
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Description: DCT的水印程序,实现了水印的鲁棒性和透明性,测试了攻击效果-DCT watermark process, achieved a watermark robustness and transparency, to test the effect of an attack
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Size: 1024 |
Author: liusha |
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