I have a black area around my image and i want to create a mask using OpenCv C++ that select just this black area so that i can paint it later. how Can i do that with out affect the image it self.
I try to converted to grayscale image and then using threshold to converted it to binary, but its affect my image since its contain black pixels.
This is the code i used to find the biggest contoure
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp""
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/photo/photo.hpp"
#include
using namespace cv;
using namespace std;
int main( )
{
Mat src;
src = imread("pano1.jpg", CV_LOAD_IMAGE_COLOR);
Mat gray;
cvtColor(src, gray, CV_BGR2GRAY);
threshold(gray, gray,30, 255,THRESH_BINARY_INV); //Threshold the gray
imshow("gray",gray);
int largest_area=0;
int largest_contour_index=0;
Rect bounding_rect;
vector> contours; // Vector for storing contour
vector hierarchy;
findContours( gray, contours, hierarchy,CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE );
// iterate through each contour.
for( int i = 0; i< contours.size(); i++ )
{
// Find the area of contour
double a=contourArea( contours[i],false);
if(a>largest_area){
largest_area=a;cout<
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