0.OpenCV可视化（Viz）——Viz环境的配置_cv::viz 无法链接

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安装步骤

遵循先安装 VTK 再安装OpenCV 的原则执行：
VTK下载（我的版本是OpenCV4.5.0 + VTK9.0.1）：
https://vtk.org/download/
OpenCV 需要安装Contrib模块。

# VTK
mkdir build && cd build
cmake .. 
make 
make install
#--------------------------------------------#

# OpenCV
mkdir build && cd build 
cmake-gui 
# 设置VTK路径（如果默认路径则会自己勾选）
# nonfree、extra_modules等库
make 
make install 
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如果一切正常，在cmake_gui输出窗口中可以看到：

然后可以运行示例测试一下：
路径：

./opencv_contrib-4.5.0/modules/viz/ # 在OpenCV_Contrib中

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结果验证

• 例程中的launching_viz.cpp

/**
 * @file launching_viz.cpp
 * @brief Launching visualization window
 * @author Ozan Cagri Tonkal
 */

#include <opencv2/viz.hpp>
#include <iostream>

using namespace cv;
using namespace std;

/**
 * @function help
 * @brief Display instructions to use this tutorial program
 */
static void help()
{
    cout
    << "--------------------------------------------------------------------------" << endl
    << "This program shows how to launch a 3D visualization window. You can stop event loop to continue executing. "
    << "You can access the same window via its name. You can run event loop for a given period of time. " << endl
    << "Usage:"                                                                     << endl
    << "./launching_viz"                                                            << endl
    << endl;
}

/**
 * @function main
 */
int main()
{
    help();
    /// Create a window
    viz::Viz3d myWindow("Viz Demo");

    /// Start event loop
    myWindow.spin();

    /// Event loop is over when pressed q, Q, e, E
    cout << "First event loop is over" << endl;

    /// Access window via its name
    viz::Viz3d sameWindow = viz::getWindowByName("Viz Demo");

    /// Start event loop
    sameWindow.spin();

    /// Event loop is over when pressed q, Q, e, E
    cout << "Second event loop is over" << endl;

    /// Event loop is over when pressed q, Q, e, E
    /// Start event loop once for 1 millisecond
    sameWindow.spinOnce(1, true);
    while(!sameWindow.wasStopped())
    {
        /// Interact with window

        /// Event loop for 1 millisecond
        sameWindow.spinOnce(1, true);
    }

    /// Once more event loop is stopped
    cout << "Last event loop is over" << endl;
    return 0;
}

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• CmakeLists.txt

cmake_minimum_required(VERSION 3.16)
project(VTKLearning)

set(CMAKE_CXX_STANDARD 14)

find_package(VTK  REQUIRED)
message(STATUS "   VTK Version: ${VTK_VERSION}" )
include(${VTK_USE_FILE})
find_package(OpenCV 4 REQUIRED)
message(STATUS "OpenCV library status:")
message(STATUS "   OpenCV Version: ${OpenCV_VERSION}" )
include_directories(${OpenCV_INCLUDES})
find_package(Eigen3)

add_executable(VTKSample creating_widgets.cpp)
target_link_libraries(VTKSample ${OpenCV_LIBS}  ${VTK_LIBRARIES})
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• 运行结果：