把图片的像素值rgb 通过rgb转hsv函数 转换为按图表（里面图片的数值）， 输出文本，可以在画图软件里绘制图像，转换文本后当作速度场或电介质场在fdtd模拟中调用。-The image pixel value rgb by rgb hsv transfer function Converted according to the chart (the value inside the picture) output, Output text, drawing softwar

离散傅里叶变换对于FDTD计算程序很有用- an algorithm resistant to print/scan process is proposed , which is based on block discrete fourier transform