使用OpenCV和C ++进行全身检测

I am using opencv for full body detection on my AR.Drone and wanted to know what would be good settings/limits for the minSize and maxSize parameters? As of now I have them blank, my code seems to detect people fairly well. I also have the minNeighbors parameter set to 7. Each time I run my code I get about 20% false positives. My hope is that setting the size parameters will reduce the amount of false positives. Any input or suggestions on other parameter settings in addition to the size parameters will be helpfulI am using opencv for full body detection on my