基于傅里叶变换的matlab下的二维周期性光子晶体带隙的计算绘图程序，属于冷门资料，网上很少见。-Based on Fourier transform matlab under the two-dimensional periodic photonic bandgap calculation drawing program, belonging to popular information, online rare.

对二维图片进行灰度变换、傅里叶变换、原点移动变换，并显示各种变换所生成的图形-A two-dimensional image of gradation conversion, Fourier transform, origin movement transformation, and display various generated graphics transform