Android ndk 编译报错：

error: undefined reference to 'cv::imread(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, int)'

#include <opencv2/core.hpp>
    #include <opencv2/imgcodecs.hpp>
    #include <opencv2/highgui.hpp>
    #include <iostream>
    using namespace cv;
    int main()
    {
        std::string image_path = "/data/000001.jpg";
        Mat img = imread(image_path, IMREAD_COLOR);
        if(img.empty())
        {
            std::cout << "Could not read the image: " << image_path << std::endl;
            return 1;
        }
        imshow("Display window", img);
        int k = waitKey(0); // Wait for a keystroke in the window
        if(k == 's')
        {
            imwrite("starry_night.png", img);
        }
        return 0;
    }

有网友的解决方法：

新版本的opencv 把读取从链接库libopencv_highgui中剥离出来多了一个libopencv_imgcodecs出来。因此在使用新版本的opencv的时候需要把这个连接库也加上。

转自：

编译连接imread报错undefined reference to cv::imread(std::__cxx11::basic_string - 简书

但是

project(blazefacencnn)

cmake_minimum_required(VERSION 3.10)

set(OpenCV_DIR ${CMAKE_SOURCE_DIR}/opencv-mobile-4.5.4-android/sdk/native/jni)
find_package(OpenCV REQUIRED core imgproc)

set(ncnn_DIR ${CMAKE_SOURCE_DIR}/ncnn-20220420-android-vulkan/${ANDROID_ABI}/lib/cmake/ncnn)
find_package(ncnn REQUIRED)

add_library(blazefacencnn SHARED blazefacencnn.cpp blazeface.cpp ndkcamera.cpp)

target_link_libraries(blazefacencnn ncnn ${OpenCV_LIBS} camera2ndk mediandk)

这是自动寻找opencv依赖库，

博客：

error: undefined reference to `cv::imread(cv::String const&, int)'问题解决方法_KayChanGeek的博客-CSDN博客

中说缺少libopencv_imgcodecs.so，因为imread属于编解码类型的，我的opencv确实没有这个，

添加引用头文件：

#include <opencv2/imgcodecs.hpp>

也报错说找不到，

undefined reference to `cv::resize 解决：

undefined reference to `cv::resize_AI视觉网奇的博客-CSDN博客