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HoG detectMultiScale

Hello, I was looking at the objectdetect sample and tried to understand how it works. How does it work when i input a image with a small image size, smaller than the detection window(64x128)? Dose it directly perform detection or re-size the image to the window size?
Also, how dose it work when input image size is bigger than the detection window?

The parameter "scale" is default set to 1.05 If detectMultiScale scales the input image to different size with scale rate 1.05, when dose it stop scalling?

also, how dose detectMultiScale pad the input image with parameter padding Size(32,32) dose it pad with zero? or just copy the margin pixel? or copy pixels with mirror approach?