Fix interface, add documentation

modules/xobjdetect/src/waldboost.cpp

@@ -365,7 +365,7 @@ int WaldBoost::predict(Ptr<CvFeatureEvaluator> eval, float *h) const
 
 void WaldBoost::write(FileStorage &fs) const
 {
-    fs << "waldboost" << "{";
+    fs << "{";
     fs << "waldboost_params"
        << "{" << "weak_count" << weak_count_ << "}";
 

modules/xobjdetect/src/wbdetector.cpp

@@ -212,7 +212,8 @@ void WBDetectorImpl::detect(
     assert(confidences.size() == bboxes.size());
 }
 
-Ptr<WBDetector> create_wbdetector()
+Ptr<WBDetector>
+WBDetector::create()
 {
     return Ptr<WBDetector>(new WBDetectorImpl());
 }