How to Convert an Image into binary bits in SIMULINK?

Hi,

I m trying to convert an image into a binary stream, so that I can transmit it over a channel. I have successfully managed to do the conversion in the MATLAB, however in SIMULINK I can't do it. I even made a MATLAB function in SIMULINK, however I keep on getting errors. I could also provide all the code if that would help.

Thank you.