fftanalysis_matlab

使用K-L变换和K-L反变换，对信号正交变换和压缩有很大帮助。(Using the K-L transform and inverse K-L transform, the signal orthogonal transform and compression of great help.)

1. BPSK modulation of data which ever you input (default data is “MANIPAL REDDY”). 2. MANIPAL REDDY is changed into ASCII Format and into two-bit format for BPSK Modulation. 3. Chaos is used for spreading the binary bit sequence. 4. Uniformly distributed Noise is added to Spread signal. 5. After reception Chaotic Chip sequence is used to recover message . 6. Filter is used for removing spikes and noise. 7. Note the filter is used is just for showing a little realisitic picture. 8. Appropriate filter should be used. 9. The original data in binary and recovered data in binary format are compared

说明：  荣格库塔法解微分方程组，比matlab自带的ode求解命令更准确，误差更少(Rong-Kutta method for solving differential equations group' s ode to solve than the matlab command comes more accurate, less error)

LDPC码仿真，采用peg构造矩阵H，译码为spa。(The code for ldpc simulation under matlab。)

实现了小波变换的阈值去噪算法，并实验仿真对比去噪效果(Internship wavelet threshold de-noising algorithm,)

粒度分析，显示累计图，返回特征值，很实用(Particle size analysis, chart shows the cumulative return to the eigenvalues)

The function calculates the mean curvature of the input structured matrix data.

丢番图方程求解（Diophantine）(Diophantine equation)

通过matlab程序实现，基于光流法的运动估计，可以对图像进行预测(By matlab program, optical flow motion estimation method based on the image can be predicted)

Thresholding is used to segment an image by setting all pixels whose intensity values are above a threshold to a foreground value and all the remaining pixels to a background value. Whereas the conventional thresholding operator uses a global threshold for all pixels, adaptive thresholding changes the threshold dynamically over the image. This more sophisticated version of thresholding can accommodate changing lighting conditions in the image, e.g. those occurring as a result of a strong illumination gradient or shadows.