cv::Exception at memory location due to net.forward()

C++
1

Hello, I’m using OpenCV 4.9 and I’ve been getting a Exception at memory location error whenever I use the net.forward() method. I’ve built OpenCV with CUDA support if that matters. Here is the code:

#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include <opencv2/imgproc.hpp>
#include "opencv2/dnn/all_layers.hpp"
#include "opencv2/dnn.hpp"
#include <Windows.h>

#include <iostream>
#include <fstream>
using namespace std;
using namespace cv;

int main(int argc, char** argv)
{
    string model_path = "C:/Users/behas/Downloads/darknet-master/darknet-master/cfg/yolov4-tiny-custom_best2.weights";
    string cfg_path = "C:/Users/behas/Downloads/darknet-master/darknet-master/cfg/yolov4-tiny-custom.cfg";
    vector<string> class_names;
    ifstream ifs(string("names.txt").c_str());
    string line;
    Mat image = imread("C:/Users/behas/PycharmProjects/bott/BrawlStarsBot/positive/test1.jpg");
    while (getline(ifs, line)) {

        cout << line << endl;
        class_names.push_back(line);

    } 


    cv::dnn::Net net = cv::dnn::readNetFromDarknet(cfg_path, model_path);
    net.setPreferableBackend(dnn::DNN_BACKEND_CUDA);
    net.setPreferableTarget(dnn::DNN_TARGET_CUDA);
   
    
    net.setInput(image);
    Mat out = net.forward();
    cv::imshow("test", out);
    waitKey(0);

As soon as it reaches the “Mat out = net.forward();” line I get the error. I’m new to OpenCV so pointing me in the right direction would be a great help :pray:
Thanks in advance

2

unfortunately, those lines are entirely broken,
neither input nor output are images, but 4d tensors

please look up, how to parse YOLO results, then try again

3

Your big meta problem is that you code does not check at all whether the function calls succeed, what they return and are your data and variables ok…