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)
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)
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)
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)
本文提出了一种算法，根据不同的噪声容限分配数据位，从而实现不等错误保护（UEP）。 新的方法是基于非UEP分配算法。新算法设计通过集成一个新的SNR-排序方案，可抗非平稳脉冲噪声和信道变化。仿真结果表明，该高度保护的比特流分布在低信噪比的大量载波上，从而确保由非平稳噪声信噪比引起的变化，不会多少影响这些载波。此外，窄带干扰不会干扰大量的重要数据。
This paper proposes an algorithm that distributes
bits according to different noise margin levels,
thereby realizing unequal error protection (UEP). The new
approach is based on a non-UEP allocation algorithm by
Chow, Cioffi, and Bingham. The new algorithm is designed
to be robust to non-stationary impulse noise and channel
variations by integrating a new SNR-sorting scheme. Simulation
results show that the highly protected bits are spread
over a high number of carriers at low SNR, thereby ensuring
that SNR variations due to non-stationary noise will not
influence these carriers much. Additionally, narrow-band
interference will not hit a large amount of important data (2015-10-22, PDF, 296KB, 下载1次)
在ns3中用来仿真ad hoc网络的一个代码例子，同时会跟踪信源进行包统计
Used for the simulation of AD hoc network in ns3 a code example, at the same time will be tracking information source for packet statistics (2014-03-04, Unix_Linux, 2KB, 下载86次)
ZPAV 是以小波，降维，剪切零树，运动估计，算术编码等算法为理论基础的音视频编解码协议，具有压缩率高，比特率低而稳定， 应用领域广，发展潜力大，延拓性好，复杂度适中，易于集成电路实现等特点，是理想的信源编解码协议。
ZPAV (H265) is audio-visual codec protocol, very different from H264/MPEG4,
ZPAV (H265) basic algorithm is wavelets, SPIHT, BSW, MMW, ......
ZPAV (H265) download address : https://sourceforge.net/projects/zpav8
(2013-09-12, WORD, 30KB, 下载7次)
SONY EFFIO资料.rar
Effio意思是强大的功能和精细的图像处理器。它是Sony的一种信号处理器，可以实现摄像机的高分辨率，高信噪比和高质量色彩再现。
SONY EFFIO information. Rar
Effio mean powerful and sophisticated image processor. It is a Sony signal processor, the camera can achieve high resolution, high signal to noise ratio and high-quality color reproduction. (2013-09-07, C/C++, 15385KB, 下载176次)
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)
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)
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)
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)
基于DCT域音频水印完整源代码，包括水印图像的预处理（二维二值图像Arnold变换、混沌加密、降维），水印的嵌入提取以及检测，信噪比和相似性系数。
Based on the the DCT domain audio watermarking complete source code, including the watermark image preprocessing (two-dimensional binary images Arnold transform chaotic encryption, dimensionality reduction), the embedded watermark extraction and detection, signal-to-noise ratio and similarity coefficient. (2013-01-06, matlab, 21211KB, 下载202次)
介绍了红外成像波门形心跟踪算法的原理，通过建立跟踪误差模型，讨论分析了红外成
像波门形心跟殊算法的误差，当误判概率越小，波门内目标像素越多，背景像素越少时，形心跟踪误差越小 当信噪比越大，相关搜索的次数越少，相关运算的像素总数越多时，正确匹配系数越高。试验证明，该算法不仅能减小跟踪误差，而且能提高跟踪的精确度和稳定性。
Infrared imaging gate centroid tracking algorithm principle, through the establishment of the tracking error model to discuss the analysis of infrared imaging gate-shaped heart with a special algorithm error, misjudgment probability of the smaller waves door target, the more pixels, the background The more pixels is low, the smaller the tracking error of the centroid of the less when the signal to noise ratio the greater the number of search related to computing the total number of pixels for a long time more correctly match the higher the coefficient. The tests show that the algorithm can not only reduce the tracking error, but also improve the tracking accuracy and stability. (2012-08-16, PDF, 318KB, 下载21次)
3 图像基本处理操作（图像显示、读写、像素统计处理、图像文件I/O等）
4 图像质量的客观评价（峰值信噪比PSNR及其应用）
5 图像的代数运算（绝对值差函数imabsdiff，叠加函数imadd，图像的旋转imrotate）
6 视频处理（创建AVI视频）
7 图像增强（直方图、直方图均化、均值滤波、中值滤波）
8 图像形态学分析（膨胀、腐蚀、开、闭运算、轮廓提取）
3 basic image processing operations (image display, read and write, pixel statistics processing, image file I/O, etc.) 4 objective evaluation of image quality (PSNR peak signal to noise ratio and its application) 5 images of algebraic operations (sum of absolute differences function imabsdiff , superimposed function imadd, image rotation imrotate) 6 video processing (creating AVI video) 7 image enhancement (histogram, histogram equalization, mean filtering, median filtering) 8 image morphology analysis (expansion, erosion, opening and closing operations, contour extraction) (2011-11-10, matlab, 4KB, 下载52次)
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)
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)
图象的渐显/渐隐是十分重要的图象效果，广泛运用于图象处理和多媒提娱乐软件。渐显/渐隐算法设计的最大困难是速度控制，包括定时和快速改变图象中各象素的颜色。如采用普通的全图扫描算法，则速度较慢，很难真正体现渐显/渐隐效果
Image渐显/ fade effects are very important images, widely used in image processing and multi-media entertainment software mentioned.渐显/ fade algorithm design are the most difficult problems, speed control, including the timing and rapid changes in images of various pixel color. Such as the ordinary full-scan algorithm, while slow, it is difficult to truly embody渐显/ fade effects (2009-02-25, C/C++, 2KB, 下载35次)
本文通过对JPEG图象压缩标准的分析，找到了一种解决这一问题的方法，即保边缘图象量化方法。在JPEG量化前，通过分析判断这一图象块是否为边缘所在块，对于边缘所在块采用较细的量化步长；对于其他块可使用较粗或者原始的量化步长进行量化，这样便可改善图象边缘处的质量。文中是利用了DCT 变换后的直流系数DC值来确定图象边缘块的，因为直流系数为这一图象块的平均亮度，如果相邻块的DC值变化较大，则它所包括的边缘细节就较多，否则说明这一图象块变化平缓，包含边缘少。根据DC值的变化我们可以大致决定这一块的量化因子，然后在量化时将边缘块进行较细的量化就可以很好的保护边缘，达到保边缘的目的。实验结果表明，与标准JPEG量化相比，采用本文方法进行量化可以提高图象峰值信噪比（PSNR）至少1～3dB，图象质量提高效果比较明显。 (2008-05-07, Visual C++, 777KB, 下载9次)
http://www.pudn.com/Download/item/id/455112.html
提出确定灰度图像二值化最佳灰度阈值的两种方法,即“双峰法”和“信噪比统计法”,并论证了这两种方法在微小零件尺寸及形位误差的检测中的实用性和局限性。
gray images made to determine the value of the two best-threshold value of the two methods "bimodal" and "signal-to-noise ratio statistics" and demonstration of the two approaches in micro-size components and configuration error detection of practicality and limitations. (2007-07-06, PDF, 19KB, 下载56次)