试一试搭建 OpenCV 入门环境

raspberryman · 2021-02-25 11:56:08

Ubuntu版本:

sudo apt-get install libopencv-dev

test.cpp

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

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{
    if( argc != 2)
    {
     cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
     return -1;
    }

    Mat image;
    image = imread(argv[1], CV_LOAD_IMAGE_COLOR);   // Read the file

    if(! image.data )                              // Check for invalid input
    {
        cout <<  "Could not open or find the image" << std::endl ;
        return -1;
    }

    namedWindow( "Display window", WINDOW_AUTOSIZE );// Create a window for display.
    imshow( "Display window", image );                   // Show our image inside it.

    waitKey(0);                                          // Wait for a keystroke in the window
    return 0;
}

编译命令行:

g++ -o test test.cpp -lopencv_core -lopencv_imgproc -lopencv_ximgproc -lopencv_highgui -lopencv_stitching -lopencv_imgcodecs

运行:

./test2 /usr/share/help/cs/cheese/figures/cheese.png

参考: https://docs.opencv.org/2.4/doc/tutorials/introduction/display_image/display_image.html

最近编辑记录 raspberryman (2021-02-25 12:00:32)

raspberryman · 2021-02-25 13:58:52

VC2017 版本:
-------------------------------------------

1. 安装 VC2017

2. OpenCV官网下载 https://opencv.org/releases/ 预编译版本 opencv-4.5.1-vc14_vc15.exe

解压到 D盘

3. 把 D:\opencv\build\x64\vc15\bin 添加到系统PATH

4. 新建工程, 把 D:\opencv\build\include 添加到头文件目录, 把 D:\opencv\build\x64\vc15\lib 添加到库文件目录, 并且把 opencv_world451.lib / opencv_world451d.lib 添加到链接库

工程文件 test.cpp 代码在一楼，

5. 编译运行，结果和一楼一样。

raspberryman · 2021-02-25 14:01:01

Qt 版本

----------------------------------------
1. 安装 VC2017

2. OpenCV官网下载 https://opencv.org/releases/ 预编译版本 opencv-4.5.1-vc14_vc15.exe

3. 下载安装 qt-opensource-windows-x86-5.12.3.exe 勾选 VC2017 x64 方案。

4. test.pro 工程文件添加以下代码:

INCLUDEPATH += D:\opencv\build\include

CONFIG(debug, debug|release) {
    LIBS += -LD:\opencv\build\x64\vc15\lib -lopencv_world451d
} else {
    LIBS += -LD:\opencv\build\x64\vc15\lib -lopencv_world451
}

5. 添加 test.cpp 代码到工程，编译运行，结果与一楼一样。

raspberryman · 2021-09-20 10:46:12

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

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{
    if( argc != 2)
    {
     cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
     return -1;
    }

    Mat image, image2;
    //image = imread(argv[1], CV_LOAD_IMAGE_COLOR);   // Read the file
    image = imread(argv[1], IMREAD_GRAYSCALE);   // Read the file

    threshold(image, image2, 128, 255, THRESH_BINARY | THRESH_OTSU);

    if(! image2.data )                              // Check for invalid input
    {
        cout <<  "Could not open or find the image" << std::endl ;
        return -1;
    }

    namedWindow( "Display window", WINDOW_AUTOSIZE);// Create a window for display.
    imshow( "Display window", image2);                   // Show our image inside it.

    waitKey(0);                                          // Wait for a keystroke in the window
    return 0;
}

QQ截图20210920104543.png

梁上君子 · 2021-09-21 10:21:20

这个demo也不错 https://github.com/murtazahassan/Learn-OpenCV-cpp-in-4-Hours

还有视频教程 https://www.youtube.com/watch?v=2FYm3GOonhk

有人转发到b站： https://www.bilibili.com/video/BV1jA411H7gM

ubuntu编译要改下 main 函数的输出。

g++ -o Chapter8 Chapter8.cpp `pkg-config opencv --libs`

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