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Hi thanks for your reply.

I will check the window sizes again to make sure I'm using the same window size to both train and detect.

SVMlight outputs a "model" with the various support vectors, a bunch of different threshold parameters and a "threshold" value. I always assumed this is what was expected in the "hit_threshold" parameter of HOGDescriptor::detectMultiScale. If you don't mind me asking, how should one look to finding the correct threshold value? Should this be optimised through trial and error, or using a cost function?

Hi thanks for your reply.reply.

I will check the window sizes again to make sure I'm using the same window size to both train and detect.detect.

SVMlight outputs a "model" with the various support vectors, a bunch of different threshold kernel parameters and a "threshold" value. I always assumed this is what was expected in the "hit_threshold" parameter of HOGDescriptor::detectMultiScale. If you don't mind me asking, how should one look to finding the correct threshold value? Should this be optimised through trial and error, or using a cost function?