DE2-35 send .hex image to PC through USB port

Hi guys!

I'm doing an image processing project using the DE2-35 kit.

So I have the image file in ".hex" format and I my workflow is:

Load the ".hex" image (300KB) into the SRAM of the DE2-35 kit (512KB), and the MCU will access the SRAM to process the image (grayscale to be specific). After finishing processing the image, it will move the processed image to the USB port to transfer the image to my PC for display.

I've successfully loaded the ".hex" image to the SRAM (It's a pain because there is only 512KB of SRAM)

My questions are:
1. How do I process the image?
2. How do I move the processed image to the USB port for data transfer?
3. Is there a better way to transfer the processed image to my PC and how can I do it?