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answered Jun 15 '19

berak gravatar image

if you trained an object detection (similar to here) , you're restricted to a single object class (and negative, background images).

if you trained a multi-class classification, you don't need any "negative" images, those from the "other" classes serve that purpose.

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if you trained an object detection (similar to here) , you're restricted to a single object class (and negative, background images).

if you trained a multi-class classification, you don't need any "negative" images, those from the "other" classes serve that purpose.

long story short: if you want to use HOGDescriptor::detectMultiscale -- you're restricted to a single object class.