OpenCV >> C/C++

modify pixels(color)

---

參考資訊：
1. Mat
2. modify-pixel-value

prototype

_Tp & at(
  int row, 
  int col);

main.cpp

#include <stdio.h>
#include <opencv2/opencv.hpp>
 
using namespace cv;
int main(int argc, char** argv)
{
  Mat image;
  image = imread("main.jpg", 1);
  if(!image.data){
    printf("No image data \n");
    return -1;
  }
  
  for(int y=0; y<50; y++){
    for(int x=0; x<100; x++){
      image.at<cv::Vec3b>(y, x)[0] = 255;
      image.at<cv::Vec3b>(y, x)[1] = 0;  
      image.at<cv::Vec3b>(y, x)[2] = 0;  
    }
  }

  namedWindow("show image", WINDOW_AUTOSIZE);
  imshow("show image", image);
  waitKey(0);
  return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project(main)
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
add_executable(main main.cpp)
target_link_libraries(main ${OpenCV_LIBS})

編譯並且執行

$ cmake .
$ make
$ ./main

完成

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