goodFeaturesToTrack給出了零大小的矢量

我想用opencv 2.4.3上的goodFeatureToTrack()函數在lena的灰色圖像上......但是，我總是得到一個零大小的矢量存儲功能cv::Point2f ...我有嘗試使用零掩碼也，但在這種情況下，應用程序掛起..我試着玩質量水平值從0.01到0.001。但是仍然是矢量的大小是zero..any想法...以下是我的代碼..goodFeaturesToTrack給出了零大小的矢量

#include <iostream> 
#include <opencv2/core/core.hpp> 
#include <opencv2/features2d/features2d.hpp> 
#include <opencv2/video/tracking.hpp> 
#include <opencv2/highgui/highgui.hpp> 
#include <vector> 

using namespace cv; 
using namespace std; 

int main() 
{ 
    Mat frameROI; 
    frameROI = imread("C:\\lena.jpg"); 
    std::vector<cv::Point2f> corners; 
    cvtColor(frameROI,frameROI,CV_RGB2GRAY); 

    //Mat mask(frameROI.size(), CV_8UC1); 
    //mask.setTo(Scalar::all(0)); 

    //goodFeaturesToTrack(frameROI,corners,10,0.001,10,mask,3,false,0.04); 
    goodFeaturesToTrack(frameROI,corners,10,0.001,10);//AFTER EDIT 
    cout<<"SIZE OF FEATURE VECTOR = "<<corners.size()<<endl; 

    imshow("VIDEO ROI",frameROI); 
    waitKey(); 

    return 0; 
}

OUTPUT：