说明：  做图像融合演示时写的一组代码，包含以下功能：频域滤波去除图像斜纹、简单的加权融合、小波融合、伪彩色融合。并可以将融合后的四种图像拼在一张图中进行对比
(Write a set of code to do image fusion demonstration includes the following features: frequency-domain filtering to remove images twill, a simple weighted fusion, wavelet fusion, pseudo-color fusion. And four kinds of images can be fused to fight in a graph comparing)