about the hog size?

[zhxing]

when i set a target size, the roipadding is the _tmp's size, because of the hog size is more less than the source image, the hog size should be (roipadding)/cell_size, but in this project i find that the hog size is more less that the size i think when i set the target a large size(for example: the target size is 112115,padding=2.5 the hog size is just 2224?? ), what is the problem?