to build the segmentation code, go to src/segment and run make.
depends on libraries: opencv
to run the segmentation code, invoke
nu-segment.exe rgb_image_filename run-id [cpu | mcore | gpu [id]]
	rgb_image_filename: rgb image
	run-id: arbitrary string, used for logging
	cpu: select cpu run
	mcore: select cpu multicore run. currently is still single threaded
	gpu: select gpu run. id is the gpu device id.