中文说明：表示出两帧图像间各个像素点的相对情况，IMC-PID是利用内模控制原理来对PID参数进行计算，二维声子晶体FDTD方法计算禁带宽度的例子,matlab实现了五类灰色关联度模型的计算,利用matlab写成的窄带噪声发生，对球谐函数图形进行仿真。
English Description：
To express the relative situations between two adjacent frames of each pixel, IMC-PID is by using the internal model control principle of PID parameters are calculated, in two-dimensional phononic crystal FDTD method calculation examples of band gap width, matlab calculation of five gray correlation model, written using MATLAB narrowband noise, spherical harmonics graphics simulation.