hamming_QPSK

简单的无约束PSO算法，适合初学者，可以进行改进(PSO algorithm for unconstrained simple, suitable for beginners )

Using matlab to predictive gold price of the backproporgation neural network

无损预测编码的主函数和子函数，以及指数哥伦布编码的源代码(Lossless predictive coding main function and subfunction, and Exponential-Golomb coding of source code)

本文算法是将24 位真彩图的亮度分量分块 DCT ,然后利用DCT 量化系数的奇偶特性嵌入8 位灰度水印图,并通过PN 序列加密来保证水印的 安全性。算法中,将灰度图像转换为二进制数据 流,置乱后扩频调制,隐藏在宿主DCT 系数量化值 中,提取时不需要宿主信号,实现水印信号的盲提 取。(This algorithm is 24-bit true color pictures of the luminance component of block DCT, quantization DCT coefficients and then use the parity properties of 8-bit grayscale watermark embedding map, and through the PN sequence of encryption to ensure the security of the watermark. Algorithm, the gray image into binary data stream, scrambling after the spread spectrum modulation, hidden in the host DCT coefficient quantization values, the extraction does not require the host signal, the blind watermark extraction.)

The mean hydration of carbohydrates as studied by normalized 2-D radial pair distributions, Claus A. Andersson and Sø ren B. Engelsen, Journal of Molecular Graphics and Modeling.The routine takes as input the location of the centerpoint of the two spheres and the two said spheres radii and calculates the rotational common volume used for normalizing the density maps of the atoms under investigation.

将图像分为nxn的分块,之后将各分块三个颜色通道的直方图平均化,最后进行离散余弦变化,分别提取各通道低频系数(The image into nxn sub-block after block of all three color channels of the histogram equalization, and finally the discrete cosine change, were extracted from the low frequency coefficients of each channel)

说明：  图像区域非均匀采样matlab程序 可以实现类人眼的图像不同采样率演示(Image regional non-uniform sampling procedures can be achieved Matlab category eye images demonstrate different sampling rates)

做时间序列预测的svm程序，matlab编的(To do time series prediction of the SVM procedure, matlab series)

说明：  快速离散傅立叶变换，实现8点的蝶形图matlab算法(Fast Discrete Fourier Transform to achieve 8:00 of the butterfly graph algorithm matlab)

说明：  通过RS分析计算hurst指数，可以直接计算整个时间序列，或者小波分解后各阶的H值。(Hurst index calculated by the RS analysis. It can calculate the H value of the time series directly , or after wavelet decomposition .)