中文说明：用wavedec2()函数对b1，b2两幅图像进行小波分解， 采用’db1’小波，分解到第三级 融合两幅图像。
English Description：
Wavedec2() function is used to decompose B1 and B2 images, and 'db1' wavelet is used to decompose them to the third level to fuse the two images.
Wavelet decomposition of B1 and B2 images with wavedec2() function
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中文说明：用wavedec2()函数对b1，b2两幅图像进行小波分解， 采用’db1’小波，分解到第三级 融合两幅图像。
English Description：
Wavedec2() function is used to decompose B1 and B2 images, and 'db1' wavelet is used to decompose them to the third level to fuse the two images.