OpenCV를 사용한 이미지 크기 조정(c++)

CMakeLists.txt

cmake_minimum_required(VERSION 3.10)
project(OpenCVExample)

find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
   
add_executable(main main.cpp)
target_link_libraries(main ${OpenCV_LIBS})
~

 

 

main.cpp

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

int main() {
   // read image
   cv::Mat image = cv::imread("Lenna.png");
   cv::imshow("Original Image", image);
   
   // let's downscale the image using new  width and height
   int down_width = 300;
   int down_height = 200;
   
   cv::Mat resized_down;
   //resize down
   cv::resize(image, resized_down, cv::Size(down_width, down_height), cv::INTER_LINEAR);
   
   // let's upscale the image using new  width and height
   int up_width = 600;
   int up_height = 400;
   
   cv::Mat resized_up;
   
   //resize up
   cv::resize(image, resized_up, cv::Size(up_width, up_height), cv::INTER_LINEAR);
   
   // Display Images and press any key to continue
   cv::imshow("Resized Down", resized_down);
   cv::imshow("Resized Up", resized_up);
   cv::waitKey();


   cv::destroyAllWindows();
   return 0;
}

 

make 한 뒤에 ./main실행하면

 

이렇게 resize된 이미지를 볼수 있다.