image-process

This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. (This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. )

说明：  潮流计算的程序，于5ieee,14ieee,30ieee都运行的不错，对于节点较多的没有验证(Flow calculation procedure, in 5ieee, 14ieee, 30ieee are running well, no more for the node to verify)

说明：  结合svd与dwt的程序，优点有很多，例如抗压缩攻击，抗剪切攻击，等等(Dwt with svd and procedures, there are many advantages, such as resistance to compression attacks, shear attacks, etc.)

itis a peceptron file example to show how to train and test data with this network.

FDTD matlab例程，A numerical solution of the equations of the electromagnetic field, followed by decomposition of the space-time iterative formula for solving Maxwell equations solved.(FDTD matlab routine, A numerical solution of the equations of the electromagnetic field, followed by decomposition of the space-time iterative formula for solving Maxwell equations solved.)

基于增广矩阵束的二维doa算法，阵列流型为L型，在matlab环境下实现(Doa algorithm based on a two-dimensional array Flow augmented matrix beam is L-shaped, achieved in the matlab environment)

通信系统中利用周期图谱方法进行谱估计的MATLAB程序(Communication system cycle map method for spectral estimation using MATLAB program)

This program evaluates the analytical first and second (if approx=2) derivatives of f numerically. The parameters and steady state values of the arguments of the function f are assumed to be in the workspace

说明：  经验模型分解程序,用于时间序列分析. (For EMD )

partial autocorrelation plot to decide the order of arima model