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admittedly, this is confusing.

pd : the directory (+ a slash), where your positive images are
p  : a textfile *inside* that folder, with plain image names, like "my1.png"
nd : the directory with neg images (see pd)
n   : a textfile inside nd with negative image names.

example:

train_HOG -pd=pos/ -p=pos.txt -nd=neg/ -n=neg.txt

.
pos
     pos.txt
     pos_img1.png
     ...
neg
     neg.txt
     neg_img1.png
     ...

(really, we should change that, so it only needs pd and nd, and it should be using cv::glob() instead of txtfiles...)