当我调用函数cvGoodFeaturesToTrack来查找Harris角时，我得到了这个错误:OpenCVError:Assertionfailed(src.type()==CV_8UC1||src.type()==CV_32FC1)incornerEigenValsVecs,file/build/buildd/opencv-2.1.0/src/cv/cvcorner.cpp,line254terminatecalledafterthrowinganinstanceof'cv::Exception'what():/build/buildd/opencv-2.1.0/src/cv/cv