image - What is the "do-nothing" convolution kernel -

if trying convolution kernel in frequency space - "do-nothing" kernel. in other words, if view image after applying kernel, , normalizing in frequency space, want see raw fourier transform

is identity matrix? kernel 3x3

thanks

a do-nothing 3x3 kernel be:

0 0 0 0 1 0 0 0 0 

i hope understood question correctly - i'm not sure why want such kernel, when it's easier skip convolution entirely.