用roi打开opencv错误断言

时间:2016-04-01 10:00:42

标签: c++ opencv

我试图使用HOG分类器检测人和其他物体。我首先使用此代码检测人员:

    capt >> frame_capture;
    capt1 >> frame_capture1;
    cv::cvtColor(frame_capture1,gray, CV_RGB2GRAY);
    vector<vector<Point> > contours;
    vector<Vec4i> hierarchy;
    findContours(gray,contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );
    vector <Rect> listOfRectangles;
    // detecting objects 
    listOfRectangles = drawBoundingBox(contours);

if(!frame_capture.empty()){
    for (int i =0; i<listOfRectangles.size();++i)
    {
        //rectangle (frame_capture, listOfRectangles[i],Scalar(255,255,0),1,8,0); //! display detections
        cv::Mat roi;
        roi.create(frame_capture.size(),CV_8UC3);
        cv::Mat image=imread("");   
         roi = image(listOfRectangles[i]);
            cv::Mat window;
            cv::resize(roi, window, cv::Size(64, 128));
            hog.detect(window, foundLocations);
            if (!foundLocations.empty())
            {
            cout << "person .." << endl;
            }   
    }

//oVideoWriter.write(frame_capture);
    imshow("video",frame_capture);
    waitKey(25);
}    

我收到了这个错误:

OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in Mat

我曾使用此链接:OpenCV: How to use HOGDescriptor::detect method?

1 个答案:

答案 0 :(得分:1)

当您使用imread()时,您传递的是空路径,因此找不到图像且cv::Mat image没有数据。在下一行中,您尝试获取空图像的子图像(ROI),这就是您收到错误的原因。

您需要正确初始化cv::Mat image。您可以通过在该行之后添加简单验证来检查一切正常,例如

if(! image.data )                              // Check for invalid input
{
    std::cout <<  "Could not open or find the image" << std::endl ;
    return;
}