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- 实现图像处理中，实现对一幅灰度图像的快速傅立叶变换,并求其变换后的系数（幅度）分布，同时实现对一幅图像做离散余弦变换,选择适当的DCT系数阈值对其进行DCT反变换 -Realize image processing, to achieve the fast Fourier transformation of a grayscale image, and determine the distribution of its transform coefficients (amplitude), wh
DCT-change
- 1.实现对lena.bmp灰度图像的快速傅立叶变换,并求其变换后的系数（幅度）分布； 2.实现对lena.bmp图像做离散余弦变换,选择适当的DCT系数阈值对其进行DCT反变换 ；-1 to achieve the fast Fourier transform on lena.bmp grayscale image, and to find the transformed coefficients (amplitude) distribution 2. To achieve lena.bm
JPEG_BaseLine_Encoder
- The JPEG compression scheme is divided into the following stages: 1. Transform the image into an optimal color space. 2. Adjust Aspect Ratio 16:9 3. Digitization Scheme 4:2:0. 4. Apply a Discrete Cosine Transform (DCT) to blocks of pixels
JPEG
- JPEG编码(基于子块DCT变换编码，什么是量化，体验DCT系数（直流系数、交流系数）以及量化步长对图像的影响)-JPEG encoding (based on sub-block DCT transform coding, what is quantitative, experience DCT coefficients (DC coefficient and AC coefficient) and quantization step size affect the image)
anti_JPEG_watermark
- 本程序为抗JPEG压缩的半脆弱性彩色图像数字水印，主要原理为DCT转换和DCT系数比较法，内含5中攻击仿真测试以及GUI界面，测试环境为MATLAB2009a，系本人2013年本科毕业设计-The procedures for the anti-JPEG compression semi-fragile color image watermarking, the main principle is the DCT transform and DCT coefficients comparativ
JSteg
- JSteg隐写技术matlab实现代码--基本思想：用秘密信息比特直接替换JPEG图像中量化后DCT系数的最低比特位，但若量化后DCT系数为0或者1，则不进行处理。（DCT系数的LSB嵌入） -JSteg steganography matlab code- the basic idea: direct replacement with the secret information bits JPEG image quantized DCT coefficients in the leas
dcthide
- dct隐写技术matlab实现资料。算法原理：通过在一个图像块中调整两个DCT系数的相对大小，隐藏秘密信息。 将载体图像分为8×8的块，做二维DCT变换 用来表示选中的两个系数的坐标对于第i bit秘密信息 if（要隐藏信息‘1’） make else make 逆DCT变换，还原图像 -dct steganography matlab implementation information. Algorithm principle: an image bl
Digital-watermarking-
- 以数字图像为载体，将水印信息嵌入到图像的DCT系数中，然后对加入数字图像中的水印进行提取。-In the digital image as the carrier, the watermark information is embedded into the image DCT coefficients, and then add digital watermark image extraction.
2-D_DCT
- 实现对灰度图进行分块儿，并对每一块进行DCT变换，得到每一个DCT系数的变化范围，然后重建灰度图。-This program is aimmed to devided the gray-scale image into many blocks,then do DCT to each block and get the DCT coefficients.Then reconstruct the gray-scale image using the inverse DCT.
dct
- DCT图像压缩：此源代码变换域系数选取采用区域编码，通过非零区域的选择，呈现不同的恢复效果-DCT image compression: This source code transform domain coefficients using the selected coding region, by choosing a non-zero area, showing the effect of different recovery
BmpToJpgJpgToBmp
- 实现jpeg压缩和解压缩,将彩色图像进行颜色空间转换、对不同的颜色分量进行不同的采样、对于3个分量进行8×8的DCT变换、对DCT系数矩阵按照JPEG推荐的量化表进行量化；对量化后的系数进行Z形扫描，最后进行熵编码，形成码流，计算比特数，和压缩比。解压从量化后的DCT系数表开始逆向进行-Jpeg compression and decompression, the color image is a color space conversion, the different color compo
Laplace
- 传统的短时谱估计语音增强算法通常假设语音谱分量相互独立，没有考虑语音谱分量间的相关性。针对这 一问题，该文提出一种新的基于多元Laplace分布模型的短时谱估计算法。首先，假设语音的离散余弦变换(DCT) 系数服从多元Laplace分布，以此利用谱分量间的相关性；在此基础上，利用多元随机矢量的高斯尺度混合模型表 示，推导得到语音DCT系数矢量的最小均方误差(MMSE)估计的解析表达式；并进一步推导了基于该分布模型的 语音存在概率，对最小均方误差估计子进行修正。实验结果表明，该算法
shat
- The aim of this application is to implement scalable mpeg type compression by varying DCT coefficients and finding minimum number of DCT coefficients that can give minimum acceptable quality.. This application only works for gray scale.
threshold-coding
- The aim of this application is to implement scalable mpeg type compression by varying DCT coefficients and finding minimum number of DCT coefficients that can give minimum acceptable quality.. This application only works for gray scale.
zonal-coding
- The aim of this application is to implement scalable mpeg type compression by varying DCT coefficients and finding minimum number of DCT coefficients that can give minimum acceptable quality.. This application only works for gray scale.
watermark_extraction
- 本代码以数字图像为载体，将水印信息嵌入到图像的DCT系数中；然后，对加入数字图像中的水印进行了提取。-The code for the digital image carrier, the watermark information embedded in the image to DCT coefficients Then, adding the digital watermark image extraction.
DCT
- DCT变换不同实现量化表量化，去除较小的变换系数，反变换后显示图像压缩效果！-Different implementations of the DCT quantization quantization table, removing a small transform coefficients, the display image compression inverse transform!
code
- 一个简单的程序，演示JPEG图片DCT系数的读取与写入。-A simple code to read and write the DCT coefficients of JPEG image.
shiyan
- matlab 实现水印标志的嵌入 提取 嵌入到载体图像的DCT系数中 有相关的原理讲解 实验图片-matlab extract the watermark embedding flag embedded into the image of DCT coefficients relevant to explain the principles of experimental picture
Multi Focus Image Fusion Based on The Maximum Number of High Valued AC Coefficients
- This source code performs multi focus image fusion based on the high valued AC coefficients of DCT transform.