opencv---加载显示图片(1)

有了第一篇的安装环境，下面执行第一个程序，也就是显示一张图片。。

其实CMakeLists.txt都不用自己写，找到opencv-3.4.14/samples/cpp/example_cmake目录下的CMakeList.txt,然后拷贝到和测试程序的同个目录下：

然后将CMakeList里面的文件名改一下。。还有就是Cpp文件名改一下。。

下面的CMakeList的imgshow 和first.cpp就是我的文件名和文件夹名。。

# cmake needs this line
cmake_minimum_required(VERSION 2.8)

# Define project name
project(imgshow)

# 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
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 "    version: ${OpenCV_VERSION}")
message(STATUS "    libraries: ${OpenCV_LIBS}")
message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")

if(CMAKE_VERSION VERSION_LESS "2.8.11")
  # Add OpenCV headers location to your include paths
  include_directories(${OpenCV_INCLUDE_DIRS})
endif()

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

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

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

using namespace cv;
using namespace std;

int main(int argc, char **argv)
{
    Mat srcImage = imread("/home/zion/CPP-study/12.opencv/imgshow/opencv-logo.png");  //图片名称最好是绝对路径，不然肯可能会报错

    imshow("L7256",srcImage);

    //waitKey()是OpenCV中的内置函数，语句waitKey(0);表示“暂停程序，等待一个按键输入”！也就是说，当程序执行到waitKey(0);时，程序被暂停运行，只有当你输入一个按键时，它才会继续运行。
    waitKey(0);

    return 0;
}

sudo cmake .
sudo make
./imgshow

执行上述步骤即可看到显示一张图片。。。

opencv---加载显示图片(1)

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