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I do not like the response of @vinnitu simply because ignoring these parameters is plain stupid. The advantage of the minSize and maxSize parameters is that you can limit the range in the object scale pyramid in which instances of your model are being looked for. This means that all false positive detections generated outside those sizes will also be discarded! Therefore it is quite usefull! I am using it in almost every single application where I have a little knowledge about possible object sizes and it increases processing speeds alot!