How to input an image from the user in simulink?

I have a MATLAB script that I want to run in Simulink (by converting it into a MATLAB function). The code I want to run goes like this:

In this script, the input can be taken from the uigetfile(). How can I take the input from the user in Simulink and pass it in this function so that it can be converted into its binary bits?

Just, for more clarification, the block to be used is,

For the input "u", I want to take image input from the user and on the "y", I would like to have it converted into its binary bits (500*500*3 uint8, in my case).

Thanks