[图形图像处理] psnr
数字水印的嵌入与提取算法有多种多样，那怎样评价数字水印嵌入效果和提取效果的好坏呢？业界是这样评价的：针对嵌入效果，我们用峰值信噪比（PSNR）进行评价，数值越大嵌入效果越好。
There are many kinds of embedding and extracting algorithms of digital watermarking. How to evaluate the embedding and extracting effect of digital watermarking? This is how the industry evaluates: for the embedding effect, we use peak signal-to-noise ratio (PSNR) to evaluate, the larger the value, the better the embedding effect. (2020-06-26, matlab, 9KB, 下载0次)
[图形图像处理] code
噪声背景下的信号检测是一项复杂而又重要的任务，在雷达信号检测和通信领域都是重要的课题。在低信噪比情况下与普通自相关函数法进行了比较。给出了时域及频域
Signal detection in noisy background is a complex and important task. It is an important topic in the field of radar signal detection and communication. Compared with the general autocorrelation function method, the signal to noise ratio is low. The time domain and frequency domain are given. (2018-04-19, matlab, 1KB, 下载10次)
[图形图像处理] fangpang
包括最后计算压缩图像的峰值信噪比和压缩效果的源码,包含特征值与特征向量的提取、训练样本以及最后的识别，毕设内容，高光谱图像基本处理。
Including the final calculation of the compressed image peak signal to noise ratio and compression of the source, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, Complete set content, basic hyperspectral image processing. (2017-01-16, matlab, 4KB, 下载11次)
[图形图像处理] image-processing
sijiequzao 是台雪城老师的四阶去噪模型代码； subspace clustering accuracy of the cod 是子空间聚类正确率代码； TVdual 是ROF模型的原始对偶算法代码； TVH-1fj 是TV_H-1图像分解模型代码； TVl1fj 是TV_L1图像分解模型代码。
" Sijiequzao" is the teacher' s desk Syracuse Fourth Order denoising model code " subspace clustering accuracy of the cod" subspace clustering is the correct rate codes " TVdual" original ROF model dual algorithm code " TVH-1fj" is TV_H-1 image decomposition model code " TVl1fj" is TV_L1 image decomposition model code. (2016-09-26, matlab, 169KB, 下载23次)
[图形图像处理] 3.2DCT
对cameraman.tif图像进行DCT变换，分别选取最大的1/4、1/8、1/16个变换系数(其余置为0)，进行反DCT得到重构图像，显示原图像和各重构图像并分别计算重构图像的峰值信噪比。
Cameraman.tif DCT transform of the image, were selected maximum 1/4,1/8,1/16 transform coefficients (the remainder is set to 0), inverse DCT to obtain the reconstructed image, the original image and displaying a reconstructed image of each and calculate the peak signal to noise ratio of the reconstructed image. (2015-07-10, matlab, 1KB, 下载76次)
[图形图像处理] demosaicking
自己写的一些代码，包括对图像的预处理，以及binary经典算法，和一些自己改进的算法的代码。自己的算法因得到的效果不错已发表。
rgb2bayer: 转换到bayer格式
border：处理图像边缘像素点
method1-4：不同的去马赛克算法的实现
cpsnr：峰值信噪比的公式实现
Write some code, including image preprocessing, and binary classical algorithm, the improved algorithm and some of their own code. Own algorithm obtained good results due to have been published.
rgb2bayer: Conversion to bayer format
border: processing the image edge pixels
method1-4: Different demosaic algorithms
cpsnr: PSNR formula to achieve (2015-03-31, matlab, 18KB, 下载34次)
[图形图像处理] evaluation
图像去雾算法质量评价标准：均值方差，峰值信噪比及平均梯度的源代码，还有引导滤波的完整源代码。
Image quality uation algorithm defogging criteria: mean and variance, the peak signal to noise ratio and average gradient of the source code, as well as guide the filter complete source code. (2014-11-25, matlab, 2KB, 下载126次)
[图形图像处理] Untitled
程序目的是分别在灰度图像中加入一定量的高斯噪声和椒盐噪声，然后采用3×3的均值滤波器和3×3中值滤波器分别对噪声图像进行处理，给出两种处理方法的峰值信噪比(PSNR)；仿效“中值滤波”的方法，对原图像分别进行“极大值滤波”和“极小值滤波”，对所形成的图像给出说明。
Program aims were a certain amount of Gaussian noise and impulse noise in grayscale image, and then using mean and median filter 33 filters were 33 noise image processing, the two methods are given peak signal to noise ratio (PSNR) follow " median filter" method, respectively, the original image " maximum filter" and " minimum value filter" , the description is given of the formed image. (2014-03-10, matlab, 2KB, 下载7次)
[图形图像处理] quality--index-of-image
此文档中的代码可以计算5种图像的质量参数，分别是：图像灰度均值、图像方差、图像平均梯度、熵和峰值信噪比及均方误差。
The code in this document can be calculated five kinds of image quality parameters, namely: the image gray value, image variance, average gradient image, entropy and peak signal to noise ratio and mean square error. (2013-06-07, matlab, 7KB, 下载135次)
[图形图像处理] matlab_watermark
数字水印参考代码，分别用checksum，lsb，patchwork等方式嵌入水印，并且附带计算信噪比和消除水印的代码
Digital watermark reference code checksum lsb in patchwork way embedded watermark and accompanying calculated signal-to-noise ratio and eliminate the watermark code (2013-03-14, matlab, 6003KB, 下载119次)
[图形图像处理] DWT2D
对图像进行二维离散小波变换, 变换级数大于等于3级,然后进行阈值化处理(阈值约为10左右),再统计系数中0的个数（百分比表示）并进行重构, 最后计算重构图像的峰值信噪比(PSNR).
Two-dimensional discrete wavelet transform image transformed series is greater than or equal to 3, and then processing thresholding (threshold of about 10 or so), then statistical coefficient in the number (expressed as a percentage) and to reconstruct the final calculation reconstructed image of the peak signal-to-noise ratio (PSNR). (2013-01-22, matlab, 82KB, 下载21次)
[图形图像处理] Gaussfilter_Area_SNR
对于磁共振图像，使用高斯滤波器对图像进行滤波，对滤波后的图像进行边缘和图像区域的选取，计算两者的均值和标准差，最后得到新的信噪比值。
For magnetic resonance images, we can use a Gaussian filter to the image for filtering. After the selection of the area of the air and the area of the image,then calculate the mean value and standard deviation value of both. Finally ,we can obtain the conclusion the new SNR value . (2013-01-18, matlab, 985KB, 下载19次)
[图形图像处理] cs_explain_radar
压缩感知在雷达中的应用 很好的一个介绍
雷达成像中惯用的方法是匹配滤波，它之所以 能够处理低信噪比的问题，是因为它利用了回波数据的冗余信息。也就是目前雷达成像算法之所以成功的关键是具有足够 多的冗余信息。现在，在雷达成像中使用压缩感知恰好是反其道而行
Compressed Sensing(CS)theory is a great breakthrough of traditional Nyquist sampling theory，it accomplishes cornpressive
sampling
and recovery of sisnal based on the sparsity of interested signal， (2012-12-04, matlab, 871KB, 下载54次)
[图形图像处理] APPENDIX
28个ＭＡＴＬＡＢ处理图像的源代码，内容丰富。本目录中的程序已经过作者调试，保证可以正常运行。调试时的计算机的配置：Windows2000/XP + Visual Studio 6.0 企业版
注意，本目录中大部分程序只能对256色图像进行操作。
28 MATLAB image processing source code, content-rich. The program has been in the catalog of commissioning, guarantee the normal operation. Debugging of the computer' s configuration: Windows2000/XP+ Visual Studio 6.0 Enterprise Edition, most of the procedures in the catalog only 256-color image. (2012-05-30, matlab, 3644KB, 下载2次)
[图形图像处理] image_fusion_proforma_evalu_quality
这是从网上整理出来的图像融合评价标准，总共有13项性能指标。包括平均梯度，边缘强度，信息熵，灰度均值，标准差(均方差MSE)，均方根误差，峰值信噪比（psnr），空间频率(sf)，图像清晰度，互信息(mi)，结构相似性(ssim)，交叉熵(cross entropy)，相对标准差。大家一起交流吧~
This is sorted out from the online image fusion evaluation criteria, there are a total of 13 performance indicators. Including the average gradient, edge strength, information entropy, gray are
Value, standard deviation (mean square error MSE), root mean square error, peak signal to noise ratio (psnr), spatial frequency (sf), image clarity, mutual information (mi), structure
Similarity (ssim), cross-entropy (cross entropy), the relative standard deviation. Exchange it with everyone ~ (2011-12-07, matlab, 8KB, 下载2317次)
[图形图像处理] BroveryImageFusion
几个关于图像质量评价的函数。包括psnr峰值信噪比，均方误差rms，正则均方误差nmse等。可用于去噪图像和压缩图像的质量评价
Several functions on the image quality evaluation. Including psnr PSNR, mean square error rms, is the mean square error nmse and so on. Can be used to image denoising and compression image quality evaluation (2011-10-19, matlab, 1KB, 下载78次)
[图形图像处理] BP-neural-network-image-compression
自己编写的一个基于matlab的图像压缩程序，有GUI界面，不能程度的压缩效果以及信噪比。
His writing of a based on the matlab image compression program, a GUI interface, can t degree of compression effect and signal-to-noise ratio.
(2011-07-26, matlab, 449KB, 下载73次)
[图形图像处理] encodinganddecoding
实现对视频图像的游程编码和解码。过程包括：二维DCT变换、量化及游程编码。
一般来讲对于视频的I帧进行恢复，其信噪比可达到38DB以上。
Implementation of the video image encoding and decoding run-length. Process includes: two-dimensional DCT transform, quantization and run-length encoding. In general, I frame for the video resume, the signal to noise ratio can reach more than 38DB. (2010-06-12, matlab, 7KB, 下载30次)
[图形图像处理] EZW
此代码是小波零树算法的matlab实现程序，子程序较为齐全，包括最后计算压缩图像的峰值信噪比和压缩效果的源码。
This code is the wavelet zero-tree algorithm matlab implementation procedures, subroutines are more complete, including the final calculation of the peak signal to noise ratio and the compressed image compression source. (2009-10-23, matlab, 259KB, 下载398次)
[图形图像处理] ImageEntropy
信息源根据一个有限的或无限但可数的符号集生成一个任意符号序列也就是说，信源的输出是离散的随机变量。本实验要求编写计算图像的一阶二阶熵的程序
Information sources based on a limited or unlimited number of symbols but can be set to generate a sequence of arbitrary symbols that is to say, the output source is the discrete random variable. Prepared in this experiment, the calculation of second-order image of the first order entropy of the process (2009-06-02, matlab, 98KB, 下载23次)