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Hi Phelipe!

To count the number of detections from the HOG detector use:

int num_detected_persons = detected_person.size();

To count the number of detections from the HAAR detector use:

int num_detected_faces = detected_faces.size();

An alternative for the kinect which I would recommended trying out is the ground-based RGBD detection in the PCL by Matteo Munaro

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