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    • 🍊 # Column: Image processing

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    πŸ’™openCV download and install

    ❀️ Basic Environment

    • Operating system: Ubuntu 18.04.5
    • Programming tool: Bash shell
    • VScode
    • Basic GCC, G++ installation

    ❀️ Download a preferred version

    • Github.com/opencv/open…

    ❀️ Minimal [brainless] installation

    
Unzip to the server directoryUnzip opencv - 4.5.3cdOpencv 4.5.3 /# Start the installation tour

mkdir build
cd build/

/usr/local = /usr/local
cmake ..
make -j16
make install

/usr/local = /usr/local = /usr/local

make install DESTDIR=/home/Moli/usr/local 

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    πŸ’™openCV reads and saves images [minimalist example]

    Program contains only | example. CPP and CMakeLists. TXT

    ❀ ️ example. CPP

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

using namespace cv;
using namespace std;

int main(a)
{
    cout << "Built with OpenCV " << CV_VERSION << endl;
    Mat src = cv::imread(".. /conda.png");
    // cv::imshow("src", src);
    // waitKey(0);
    // Image zoom
    int width{256}, height{256};
    cv::resize(src, src, cv::Size(width, height));

    cv::imwrite("256src.png", src);
    return 0;
}

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    ❀ ️ CMakeLists. TXT

    OpenCV_DIR = openCV build

    # cmake needs this line
cmake_minimum_required(VERSION 3.1)

# Define project name
project(Richard _project first_ ink)

# Find OpenCV, you may need to set OpenCV_DIR variable
# to the absolute path to the directory containing OpenCVConfig.cmake file
# via the command line or GUI

set(OpenCV_DIR /home/咨理/project/project21Next/vscodeFirst/opencv4.53./build)
find_package(OpenCV REQUIRED)

# If the package has been found, several variables will
# be set, you can find the full list with descriptions
# in the OpenCVConfig.cmake file.
# Print some message showing some of them
message(STATUS "OpenCV library status:")
message(STATUS " config: ${OpenCV_DIR}")
message(STATUS " version: ${OpenCV_VERSION}")
message(STATUS " libraries: ${OpenCV_LIBS}")
message(STATUS " include path: ${OpenCV_INCLUDE_DIRS}")

# Declare the executable target built from your sources
add_executable(first example.cpp)

# Link your application with OpenCV libraries
target_link_libraries(first PRIVATE ${OpenCV_LIBS})

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    πŸ’™ Compile and run in Linux

    The command is

    mkdir build

cd  build/

cmake ..
make

# generated executable file can be run first |

./first 

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    View the resulting zoom image.

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