您可能知道，OpenCV3中的许多事情都发生了变化。在以前的OpenCV版本中，我曾经这样做过:MattrainData(classes*samples,ImageSize,CV_32FC1);MattrainClasses(classes*samples,1,CV_32FC1);KNNLearning(&trainData,&trainClasses);//learningfunctionKNearestknearest(trainData,trainClasses);//creating//loadinginputimageMatinput=imread("input.jpg");