plot_hht

u can calculate DCT clc inp = imread( Im1.jpg ) inp1 = imread( Im2.jpg ) A = double(inp(:,:,1)) B = double(inp1(:,:,1)) A1=double(blkproc(A,[8 8], dct2 )) B1=double(blkproc(B,[8 8], dct2 )) [r,c] = size(A1) r1 = [] for i=1:r for j=1:c if A1(i,j) > B1(i,j) r1(i,j)=A1(i,j) else r1(i,j)=B1(i,j) end end end r1= double(r1(:,:,1)) C=blkproc(r1,[8 8], idct2 ) round(C) C1=idct2(r1) figure imshow(uint8(C)) figure imshow(uint8(C1)) imwrite(uint8(C), dct8x8min.jpg )

回归法做图像变化检测。有图片有结果，有论文说明，可参照使用。(Regression method to do the image change detection. The outcome of a picture, a paper note, reference may be used.)

Solving an upper triangular system U x = b by back-substitution Solving a lower triangular system L x = b by forward-substitution(backward substitution and forward substitution)

水声通信中海洋噪声的仿真，wenz测量的噪声谱线级，噪声估计MATLAB(Noise level underwater communication lines in ocean noise simulation, wenz measured noise estimation MATLAB)

自己写的costas信号程序，需要的可以下载(I wrote it myself costas. A friend in need can be downloaded.)

度分秒转化弧度，需要时加上自己的参数值可直接调用函数(Arc minutes and seconds into degrees, if necessary with their parameter values can call the function directly)

matlab PCA应用于TE数据进行检测 包括SPE统计量计算，以及SPE和T方控制限的计算。(matlab PCA applies to TE detection data including SPE statistic calculation, as well as the SPE and T control limit calculations.)

OFDM盲信道估计算法的编程，十分形象地模拟了OFDM盲信道估计算法。(ofdm blind channel estimation )

16QAM的调制与解调的实现，比较不错的代码，欢迎下载(16QAM modulation and demodulation achieve good code, welcome to download)

To do scrambling and inverser scrambling of array using a key (seed)