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implement fourier transform by matlab

说明：  maltab j求解背包问题 遗传算法(maltab 0-1bag gasuanfa )

用于HDB3的编解码，用matlab仿真，有完整的程序(Used for encoding and decoding of HDB3, matlab simulation, the complete program)

PID参数的整定就是合理的选择PID三参数。从系统的稳定性、响应速度，超调量和稳态精度等各方面考虑问题，三参数的作用如下：(PID parameter setting is the reasonable choice of three parameters of PID. From the system stability and response speed, overshoot and steady state accuracy and so on various aspects to consider problem, the role of the three parameters are as follows:)

Global Posisioning System Applications

北京航空航天出版社matlab从零到进阶的第三章程序(Beijing University of Aeronautics and Astronautics Press matlab from zero to advanced procedures in Chapter III)

适用于三维定位，和chan算法结合使用,能够提高精度。(Very useful.)

M-QAM constellation mapping

pixel by pixel feature extraction

matlab环境下的张正友法标定，可以获得相机的内参外参(Zhang Zhengyou calibration method under matlab environment, you can get the camera' s internal reference external parameters)