What is the do-nothing convolutional kernel

Question

If I try to make a convolutional core in frequency space - what is the "do nothing" kernel. In other words, if I look at the image after applying the kernel and normalizing it in the frequency space, I just want to see the raw Fourier transform

Is it a unit matrix? core 3x3

thanks

Answer 1

The 3x3 kernel does nothing:

0 0 0 0 1 0 0 0 0 

I hope I understood your question correctly - I'm not sure why you need such a kernel when it is much easier to just skip the whole convolution.