got Piotr's FHOG set up to produce reasonable visual results. Going to check what the computational performance is like.
Piotr's imResample and VOC5's resize() both take ~5-10ms to downsample an image. (my benchmark is just 640x480 -> 640x480.) Seems to run at the same speed regardless of the output size.
added a timer for ONLY piotr's HOG and not {downsampling, place features, padding}. Piotr's HOG takes 100ms, total over all levels. (again, only counting HOG here)
tallying up time spent scaling imgs
added timers for HOG extraction and downsampling in VOC5 and Piotr's code.
modularizing so that we can have the option to run Piotr's HOG or VOC5 HOG