-
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 )
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matlab program to practice
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- 积分：1
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PROGRAM
说明： 最大熵原理 谱估计 MATLAB开发环境
可用于图像处理 图像分块(MESE matlab )
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卡尔曼滤波算法(内含详细推导)，可供读者自行学习，经本人测试，代码无误(Kalman filter algorithm (including the detailed derivation))
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用MATLAB实现了QR二维码的编码及解码，可显示二维码并读出二维码信息(Using MATLAB to achieve a two-dimensional code QR coding and decoding, reading out the two-dimensional code information)
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invertersvpwm
inverter space vector pwm
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l1magic-1.1
说明： 基于matlab的稀疏表示中L1范数计算源码(the codes for L1 in sparsty representation with matlab)
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threepower_harmonicfilter
交流电力系统中常见的无源滤波器模型，可以去除大部分谐波(Passive filter model in AC power system)
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ar_xfc
高级数字信号处理中用burg法进行的谱估计，共享一下，希望有所帮助(Advanced digital signal processing using burg method of spectrum estimation, sharing, hope I help)
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