Trying to detect the color red in opencv c++

C++
1

I am trying to learn to detect the color red in opencv in c++. and i am struggling with the code a bit can someone help me? the code is below: #include

#include “opencv2/objdetect.hpp”

#include “opencv2/highgui.hpp”

#include “opencv2/imgproc.hpp”

#include “opencv2/videoio.hpp”

#include <opencv2/imgcodecs.hpp>

#include

#include

#include <opencv2/core.hpp>

using namespace cv;

using namespace std;

char s = ‘s’;

int min_blue = (110,50,50);

int max_blue= (130,255,255);

int min_red = (0,150,127);

int max_red = (178,255,255);

Mat img;

int main(){

String path = samples::findFile(“/home/d22/opencv_contrib-4.x/samples/data/redtest1.jpg”); // img to read

img = imread(path,IMREAD_COLOR); // reading img

if(img.empty())

{

cout << "Could not read the image: " << img << endl;

return 1;

}

Mat background;

Mat mask, imghsv;

cvtColor(img,imghsv,COLOR_BGR2HSV);

inRange(imghsv,Scalar(min_red),Scalar(max_red),mask);

vector < vector < Point>> contours;

vector redbox(contours.size());

Mat canny_out;

Canny(img,canny_out,100,100);

findContours(mask,contours,RETR_EXTERNAL,CHAIN_APPROX_SIMPLE);

// Draw contours and labels

for (size_t i = 0; i < contours.size(); i++) {

if (contourArea(contours[i]) > 500) {

redbox[i] = boundingRect(contours[i]);

rectangle(img, redbox[i].tl(), redbox[i].br(),Scalar(0, 0, 255), 2);

      //  putText(img, "Red", redbox.tl(), cv::FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 2);

cout << "Red_contours values " << contours.size() << endl;

        }

    }

imshow(“mask”,img);

waitKey(0);

destroyAllWindows();

}