维纳滤波;Matlab错误:未定义函数'减'输入参数'struct'

I am trying to compute an algorithm in Matlab to wiener filter out an unknown point spread function given a noisy image convoluted with this point spread function and the original image without noise. I am fairly new to Matlab and I am trying to follow a code online so some things I do not understand fully yet so i appologise for any ignorance on my part.I am trying to compute an algorithm in Matlab t