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1.img.cpp

// 图片的读取和显示
// 导入opencv头文件
#include "opencv2/opencv.hpp"
#include <iostream>int main(int argc, char** argv)
{// 读取图片，mat是matrix的缩写，是一个矩阵，类似与numpy ndarraycv::Mat image = cv::imread("./media/cat.jpg");// 判断是否读取成功if (image.empty()){std::cout << "无法读取图片 " << std::endl;return 1;}// 打印图片高度和宽度std::cout << "图片高度: " << image.rows << " 宽度: " << image.cols << std::endl;// 打印图片data// 以Numpy的方式打印// std::cout << "图片data: " << cv::format(image, cv::Formatter::FMT_NUMPY) << std::endl;// 以python list的方式打印// std::cout << "图片data: " << cv::format(image, cv::Formatter::FMT_PYTHON) << std::endl;// 创建一个灰度图cv::Mat gray;// 转换为灰度图cv::cvtColor(image, gray, cv::COLOR_BGR2GRAY);// 保存cv::imwrite("./gray.jpg", gray);// // 显示// cv::imshow("原图", image);// cv::imshow("灰度图", gray);// // 等待按键// cv::waitKey(0);}

2.创建cmake-CMakeLists.txt

# 最低版本要求
cmake_minimum_required(VERSION 3.10)# 项目信息
project(opencv_demo)# 使用find_package命令查找OpenCV库
find_package(OpenCV REQUIRED)
find_package(gflags REQUIRED)if (OpenCV_FOUND)message(STATUS "OpenCV library status:")message(STATUS "    version: ${OpenCV_VERSION}")message(STATUS "    libraries: ${OpenCV_LIBS}")message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")
else()message(FATAL_ERROR "Could not find OpenCV library")
endif()# 添加头文件
include_directories(${OpenCV_INCLUDE_DIRS} ${gflags_INCLUDE_DIRS})
# 链接库
link_libraries(${OpenCV_LIBS} ${gflags_LIBRARIES})# 添加可执行文件
add_executable(demo_1.img src/1.img.cpp)
add_executable(demo_2.video src/2.video.cpp)
add_executable(demo_3.camera src/3.camera.cpp)

终端--运行生成任务--g++----task.json

{"version": "2.0.0","tasks": [// 1. cmake 配置{"label": "cmake 配置","type": "shell","command": "cmake -B build -S . -DCMAKE_BUILD_TYPE=Debug","problemMatcher": [],"group": {"kind": "build","isDefault": true},"options": {"cwd": "${workspaceFolder}"}},// 2. cmake 构建{"label": "cmake 构建","type": "shell","command": "cmake --build build","problemMatcher": [],"group": {"kind": "build","isDefault": true},"options": {"cwd": "${workspaceFolder}"},"dependsOn": ["cmake 配置"]},// 3. 删除build 目录{"label": "删除build 目录","type": "shell","command": "rm -rf build","problemMatcher": [],"group": {"kind": "build","isDefault": true},"options": {"cwd": "${workspaceFolder}"}},// 4. 运行可执行文件{"label": "运行可执行文件","type": "shell","command": "./build/demo_${fileBasenameNoExtension}","problemMatcher": [],"group": {"kind": "build","isDefault": true},"options": {"cwd": "${workspaceFolder}"},"dependsOn": ["cmake 构建"]}]
}

launch.json

{// 使用 IntelliSense 了解相关属性。 // 悬停以查看现有属性的描述。// 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387"version": "0.2.0","configurations": [{"type": "lldb","request": "launch","name": "C++ CMake Debug","program": "${workspaceFolder}/build/demo_${fileBasenameNoExtension}","args": [],"cwd": "${workspaceFolder}","preLaunchTask": "cmake 构建",}]
}