HELP! Webcam to (15x40) Web Colours?

Hi friends, I've been looking all over the internet but could not find anything regarding this topic.

I am creating a LED Mask powered by Arduino and have successfully imported images onto my matrix system using an array of colour codes created through a software called LCD Image Converter.

Now to move beyond that, I want to use a webcam to generate the same array to send over to ArduinoIDE however, I cannot seem to do that as whenever I try to jit.iter and unpack, the program crashes. Is there any way for me to do it? :(