OpenCV安装:最基础的openCV程序运行示例【1】

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openCV 下载安装

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❤️基础环境

• 操作系统：Ubuntu 18.04.5
• 编程工具：bash shell
• VScode
• 基础的 gcc、G++ 安装

❤️下载一个喜欢的版本即可

• https://github.com/opencv/opencv/releases/tag/4.5.3

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❤️极简【无脑】安装

# 解压到服务器目录
unzip opencv-4.5.3

cd opencv-4.5.3/

# 开始安装之旅

mkdir build
cd build/

# root 用户直接运行，会默认编译安装到/usr/local 目录下
cmake ..
make -j16
make install

# 普通用户，没有 /usr/local 写入权限，需要 指定安装路径

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

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openCV 读取保存图像【极简示例】

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程序只包含 | example.cpp 和 CMakeLists.txt 即可

❤️example.cpp

#include "opencv2/core.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/videoio.hpp"
#include 

using namespace cv;
using namespace std;

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

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

❤️CMakeLists.txt

配置 OpenCV_DIR 路径【openCV build 目录即可】

# cmake needs this line
cmake_minimum_required(VERSION 3.1)

# Define project name
project(first_墨理_project)

# 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/墨理/project/project21Next/vscodeFirst/opencv-4.5.3/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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Linux 下编译运行

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命令如下

mkdir build

cd  build/

cmake ..
make

# 生成得到可执行文件 first | 运行即可 

./first 

查看生成的缩放图片【没看错，是在下】

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