req_dac3.0(Unix)

Derivative based operators, SUSAN edge detector ...

Finite Element for Total Variation Minimization

matlab 实现的基于logistic 混沌映射的图像加密，可用于灰度图像和彩色图像的加密。(Grayscal and color image encryption based on Logistic map)

介绍了如何利用Matlab的代码生成功能将Simulink模型转换成目标语言模型的方法(The way that how to use the capability of Matlab in code generation to convert the mode1s constructed by Simulink to target language models is introduced)

说明：  matlab 实现优化遗传算法程序，适合于遗传算法初学者(matlab genetic algorithm optimized procedures, genetic algorithms for beginners)

AM RECEIVER based on super heterodyne principle virtually used in all modern radio and television receivers. The approach mainly involves the use of heterodyning or frequency mixing. The signal from the antenna is filtered sufficiently at least to reject the image frequency and possibly amplified. A local oscillator in the receiver produces a sine wave which mixes with that signal, shifting it to a specific intermediate frequency (IF), usually a lower frequency. The IF signals is itself filtered and amplified and possibly processed in additional ways. The demodulator uses the IF signals rather than the original radio frequency to recreate a copy of the original modulation (such as audio). The project is coded in MATLAB.

k-means聚类,用于聚类研究的基本算法，值得学习。(k-means cluster)

用灰度共生矩阵提取五个纹理特征 包括：熵、均匀度、相关性、能量、对比度(Extraction of five GLCM texture characteristics，Include: entropy, uniformity, correlation, energy, contrast)

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：  R/S分析，matlab程序，虽然比较繁琐，但还好使，请多多关注(R/S)