Extracting Main colour from an image

#include <stdio.h>
#include <iostream>
#include "opencv2/core.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"

using namespace cv;
using namespace std;

int main()
{
  // namedWindow("Colour dominant in the Image:");

  Mat BitwiseImage;
  Mat inputImage = imread("RedApple.bmp"); // Image is read in
  string dominantColour;

  if (inputImage.empty())
  {
    cout<< "Can't find the image" <<endl;
    return -1;
  }

  Mat imageInHSV;
  cvtColor(inputImage, imageInHSV, COLOR_BGR2HSV);

  // Different grayscale images  are created isolating RED/GREEN and BLUE pixels
  Mat blueColourMask, greenColourMask, redColourMaskLow, redColourMaskHigh;
  inRange(imageInHSV, Scalar(100, 50, 50), Scalar(140, 255, 255), blueColourMask);
  inRange(imageInHSV, Scalar(35, 70, 50), Scalar(85, 255, 255), greenColourMask);
  inRange(imageInHSV, Scalar(0, 50, 50), Scalar(10, 255, 255), redColourMaskLow);
  inRange(imageInHSV, Scalar(170, 50, 50), Scalar(179, 255, 255), redColourMaskHigh);

  // Number of corresponding pixels of each colour are counted in each mask
  int bluePixelCount = countNonZero(blueColourMask);
  int greenPixelCount = countNonZero(greenColourMask);
  int redPixelCountLow = countNonZero(redColourMaskLow);
  int redPixelCountHigh = countNonZero(redColourMaskHigh);
  int totalRedPixelCount = redPixelCountLow + redPixelCountHigh;


  //Mask with the most pixels that aren't zero is the dominant colour
  if (bluePixelCount >= greenPixelCount && bluePixelCount >= totalRedPixelCount)
  {
    dominantColour = "Blue";
    bitwise_and(inputImage, inputImage, BitwiseImage, blueColourMask);
  }
  else if (greenPixelCount >= bluePixelCount && greenPixelCount >= totalRedPixelCount)
  {
    dominantColour = "Green";
    bitwise_and(inputImage, inputImage, BitwiseImage, greenColourMask);
  }
  else
  {
    dominantColour = "Red";
    bitwise_or(redColourMaskLow, redColourMaskHigh, redColourMaskLow);
    bitwise_and(inputImage, inputImage, BitwiseImage, redColourMaskLow);
  }

  cout << "Colour Dominant: " << dominantColour <<endl;

  imshow("Dominant Colour", inputImage);
  imshow("Bitwise Operation Performed", BitwiseImage);

  waitKey(0);
  destroyAllWindows();

  return 0;
}