实现多种方法的全色和多光谱图像融合：（1）IHS变换（2）高通滤波（3）GIHS方法（4）小波变换（5）PCA （6）Brovey变换-A variety of methods of panchromatic and multispectral image fusion: (1) IHS transform (2) high-pass filter (3) GIHS method (4) wavelet transform (5) PCA (6) Brovey transform