Is it possible to run the CascadeClassifer without preprocessing?

edit

i cant find the methods "setImage" or "runAt". I think they are private or something???

Sorry, it seems that this docs are outdated. In actual API you should use detectMultiScale with options. For the instance if you have WxH _image with region of interest 24x24 than do:

cv::Mat _roimat(_image, cv::Rect(_targetX,_targetY,24,24)); // manually select the roi region 
std::vector<cv::Rect> _vrects; // this vector will store the detector's output
_cascadeclassifier.detectMultiScale(_roimat, _vrects, 1.1, 3, 0, cv::Size(24,24), cv::Size(24,24));

Yes with this solution it works, thanks!