[SOLVED] split a BGR matrix without use split() function

split a BGR matrix without use split() function

I am programming with Visual Studio 2012 and the Opencv library, in the 2.4.6 version.

Someone can help me about splitting a BGR image into three images, one for every channel?

I know that there is the split function in OpenCV, but it causes me an unhandled exception, probably because I have a 64 bit processor with the 32 bit library, or probably it's the version of the library, so I want to know how to iterate on the pixel values of a BGR matrix without use split().

Thanks in advance.

Solution

If you don't want to use split() then you can read each r,g,b pixel value from your source image and write to destination image and which should be single channel.

#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;


int main( int argc, const char** argv ){

 Mat src = imread("ball.jpg", 1);
 Mat r(src.rows,src.cols,CV_8UC1);
 Mat g(src.rows,src.cols,CV_8UC1);
 Mat b(src.rows,src.cols,CV_8UC1);

 for(int i=0;i<src.rows;i++){
  for(int j=0;j<src.cols;j++){
    Vec3b pixel = src.at<Vec3b>(i, j);
    b.at<uchar>(i,j) = pixel[0];
    g.at<uchar>(i,j) = pixel[1];
    r.at<uchar>(i,j) = pixel[2];
   }
  }

  imshow("src", src);
  imshow("r", r);
  imshow("g", g);
  imshow("b", b);

  waitKey(0);
 }