-
dct
M=512 原图像长度
N=64
K=8
I=zeros(M,M)
J=zeros(N,N)
BLOCK=zeros(K,K)
显示原图像
I=imread( f:ceshiyuanshitu.bmp )
figure
imshow(I)
xlabel( 原始图像 )
显示水印图像
J=imread( f:ceshilogistic_nuaa64.bmp )
figure
imshow(J)
xlabel( 水印图像 )
嵌入水印
tem=1
for p=1:N
for q=1:N
x=(p-1)*K+1
y=(q-1)*K+1
BLOCK=I(x:x+K-1,y:y+K-1)
BLOCK=dct2(BLOCK)
if J(p,q)==0
a=-1
else
a=1
end
BLOCK(2,1)=BLOCK(2,1)*(1+a*0.01)
BLOCK=idct2(BLOCK)
I(x:x+K-1,y:y+K-1)=BLOCK
end
end
显示嵌入水印后的图像
figure
imshow(I)
xlabel( 嵌入水印后的图像 )
imwrite(I, f:ceshiembedded.bmp )
- 2010-06-13 18:43:39下载
- 积分:1
-
program
this code is used for frequency modulation in matlab
- 2011-05-24 19:13:13下载
- 积分:1
-
OFDMSIMULATE
OFDM仿真
参数:
% 子载波数 128
% 位数/ 符号 2
% 符号数/ 载波 1000
% 训练符号数 0
% 循环前缀长度 8 (1/16)*T
% 调制方式 4-QAM
% 多径信道数 3
% IFFT Size 128
% 信道最大时延 2
(OFDM simulation parameters : % subcarriers median number of 128%/2% Symbol Symbol/Carrier Training 1000% 0% Symbol few cyclic prefix length 8 (1/16)* T% modulation 4-QAM% multi-path channel number 3% 128% Size IFFT letter Maximum delay 2)
- 2007-05-05 22:59:17下载
- 积分:1
-
CHAOGAOSI
研究表明超高斯分布更加贴近语音信号的实际分布,然而语音信号很难用单一的概率密度
函数准确描述,针对这一情况,提出了一种用超高斯混合模型对语音信号幅度谱建模的新方法,并推导了
基于此模型的幅度谱最小均方误差估的估计式。仿真结果表明:与传统的短时谱估计算法相比,该算法不
仅能够进一步提高增强语音的信噪比,而且可以有效减小增强语音的失真度,提高增强语音的主观感知
质量。 (Recent research indicates that the speech spectral amplitude distributions could
be fairly described with super-Gaussian probability density function. However, the complexity
of speech signal determines that the distribution statistics ofspeech signal could not be well
described by single simple function. Thus a super-Gaussian mixture model for speech spectral
amplitude is proposed, and with this model, a minimum mean-square error (MMSE) estimator for speech
signals spectral amplitude is derived. The simulation results show that this algorithm based on
Gaussian and super-Gaussian speech model could achieve better noise suppression and lower speech
distortion as compared with the conventional short-time spectral amplitude estimation algorithm. )
- 2014-01-18 10:13:52下载
- 积分:1
-
echocancellation
echo cancellation by using adaptive filter NLMS
- 2011-08-04 23:35:37下载
- 积分:1
-
Basic-concept-in-matlab
basic concept in matlab
- 2015-02-19 16:47:33下载
- 积分:1
-
ExtractionofimageofthevirtualplantandVisualization
叶图像提取研究及虚拟植物可视化实现(Extraction of leaf images and virtual plant visualization realize)
- 2008-03-21 21:54:38下载
- 积分:1
-
mego1
ecg signal processing with alot of classification and feature extraction technique
- 2011-11-01 05:47:13下载
- 积分:1
-
ewma_covariancecc
Exponentially weighted covariance matrix
- 2013-10-25 17:08:20下载
- 积分:1
-
热晕程序
matlab编写的热晕相位屏仿真程序,可以仿真不同条件下的热晕相位屏(A simulation program for thermal halo phase screen written by MATLAB)
- 2018-07-22 16:03:53下载
- 积分:1