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彩色图像的篡改检测及自恢复算法
- 彩色图像的篡改检测及自恢复算法赵春晖，孙建军，朱海峰(哈尔滨工程大学信息与通信工程学院，黑龙江哈尔滨150001)摘要：数字水印是图像认证的有效手段之一．利用小波变换提出一种计算简单的彩色图像水印算法，将一个图像的主要内容嵌入该图像自身之中，用均值量化的方法在亮度信号中嵌入水印，实现篡改检测和定位篡改区域；用多余的色度空间嵌入亮度信号和色度信号，用于恢复被篡改的图像内容．该算法可以获取较高的峰值信噪比，具有很好的鲁棒性．实验结果表明，该算法对删除、替换等恶意图像篡改具有良好的检测、定位和自修复能
7.5
- 把各阶导函数的ESD作为a的函数，确定其峰值频率的数值。该函数把以下变量作为输入：a的最小值alphamin，其增量步长alphastep；-various derivative function of the ESD as a function of its peak frequency values. The function of the following variables as input : a minimum of alphamin. its incremental step a
stepchar
- 求系统的时域性能指标的函数，给定系统的数学模型，即可通过该函数计算系统的超调量、峰值时间、调整时间和上升时间，经测试非常好用。-system for the time-domain performance of the function, given the mathematical model, This function can be calculated by the overshoot, the peak time, adjusting time and rise time, the t
YUVPSNR
- PSNR 用来计算峰值信噪比的函数。可以输入两个yuv文件得出平均值-PSNR peak signal-to-noise ratio used to calculate the function. 2 can import documents obtained average yuv
dwtprocedure
- 整个数字水印的程序。包括峰值信躁比的计算，各种攻击后的水印提取等等。-entire digital watermarking process. Including peak impatient than the letter, after the attacks watermark extraction, and so on.
Multi_threshold
- 先对灰阶直方图做平滑后 找出三个峰值 然后在对三个峰值可以找出两个谷值 可以找出两个阈值-first pair of gray histogram so smoothing then identify three peaks in the three peaks can find two Valley can find value two threshold
codefile
- 对图像进行二维离散小波变换, 变换级数大于等于3级, 并进行重构, 最后计算重构图像的峰值信噪比(PSNR).-images of two-dimensional discrete wavelet transform, transform Series is greater than or equal to 3, and reconstruction, Image Reconstruction final calculation of the peak signal-to-noise rati
SIFTvoice
- 用改进的SIFT 方法检测语音基频。有效去除了峰值检测中的“野点”。-improved detection methods sciences voice frequency. In addition to the effective detection of the peak "Outlier."
SPFFT
- 信号处理，将采集数据显示，FFT变换，积分，找出峰值并显示-signal processing, data acquisition, the FFT transform, integration, and to identify the peak show
HoughCy
- 好用地 matlab版本地 用hough变换进行直线提取地程序，提取最长地直线，以后会改进，可以提取累计矩阵中，局部峰值点地直线！-good land use Matlab version hough transform line extraction procedures. to extract the longest line, it will improve, can extract accumulated matrix, partial to the peak point straigh
HniqueForPAPRReductionOfCodedOFDMSignal
- 改进的SLM算法，用于降低OFDM系统的峰值平均功率比-Improved algorithms for OFDM system to reduce the peak-to-average power ratio
SLM_OFDM
- OFDM系统中用SLM算法降低系统的峰值平均功率比-SLM OFDM system using the algorithm to reduce peak-to-average power ratio
CLIPPING_OFDM
- OFDM系统中用限幅法降低系统的峰值平均功率比-OFDM system limiting method used to reduce the peak-to-average power ratio
PTS_OFDM
- OFDM系统中用PTS算法降低系统的峰值平均功率比-OFDM system PTS algorithm used to reduce the peak-to-average power ratio
lys10.m
- 基于回归法进行负荷预测的ＭＡＴＬＡＢ程序，用与峰峰值负荷预测-based on regression forecast load MATLAB program, and the peak load forecast
images001
- 实现PSNR的MATLAB代码，功能是比较两图象的峰峰值。-achieve PSNR MATLAB code is more functional image of the two-peak.
OFDMandItsKeyTechniques
- OFDM的基本原理和信道均衡以及峰值功率的控制-OFDM and the fundamental principles channel equalization and peak power control
TEST_VOL
- 一个完整的STC89LE5412程序，实现２路电压，２路电流采样，滤波，和瞬间功率峰值计算
22
- 这是基于4*4键盘，及液晶的菜单设计，菜单内容包括波形、峰峰值和频率。
circledetection
- 基于存在概率图的圆检测方法.提出了一种基于存在概率图的圆检测方法, 将图像边缘点共圆结构信息变换为圆存在概率图中的峰, 再通过峰值检测确定圆的参数。该方法能有效地检出边缘不清晰、不完整的圆形轮廓, 具有占用内存少, 阈值物理意义明确的特 点, 较好地解决了标准 HT 圆检测方法中占用内存空间大, 计算效率低的问题。实验结果表明圆存在概率图具有较强的稳定性和分辨能力.