:param cascade: Haar classifier cascade (OpenCV 1.x API only). See :ocv:func:`CascadeClassifier::detectMultiScale` for more information.
:param feval: Pointer to the feature evaluator used for computing features.
:param image: Matrix of the type ``CV_8UC1`` containing an image where the features are computed.
The function is automatically called by :ocv:func:`CascadeClassifier::detectMultiScale` at every image scale. But if you want to test various locations manually using :ocv:func:`CascadeClassifier::runAt`, you need to call the function before, so that the integral images are computed.
.. note:: in the old API you need to supply integral images (that can be obtained using :ocv:cfunc:`Integral`) instead of the original image.
CascadeClassifier::runAt
----------------------------
Runs the detector at the specified point.
.. ocv:function:: int CascadeClassifier::runAt( Ptr<FeatureEvaluator>& feval, Point pt, double& weight )
.. ocv:cfunction:: int cvRunHaarClassifierCascade( const CvHaarClassifierCascade* cascade, CvPoint pt, int start_stage=0 )
:param cascade: Haar classifier cascade (OpenCV 1.x API only). See :ocv:func:`CascadeClassifier::detectMultiScale` for more information.
:param feval: Feature evaluator used for computing features.
:param pt: Upper left point of the window where the features are computed. Size of the window is equal to the size of training images.
The function returns 1 if the cascade classifier detects an object in the given location.
Otherwise, it returns negated index of the stage at which the candidate has been rejected.
Use :ocv:func:`CascadeClassifier::setImage` to set the image for the detector to work with.