Combining Objects?

Hello,

I modified an image of a mountain range in Adobe Illustrator and saved it as a DWG file.  I am now trying to import it into another CAD program.  The drawing has 7024 objects.  I've tried "group" and "block" and still end up with 7024 objects.  Is there another command I can use to combine the objects and still retain the image quality.  The image contains 16 colors.  I've attached the drawing. 

Any suggestions would be greatly appreciated.   

Anthony