opencv 的循环缓冲区 cv::Mat

Question

我使用this example进行循环缓冲。

为了测试我创建了接下来的三个函数：

void cnt(ScreenStreamer &SS, cv::Mat & img)
{
    CVUtils::Image m_img;
    SS >> m_img;
    img = m_img.matRef();
    cv::imshow("",img);
    cv::waitKey();
}

void  snd1(circ_buffer<cv::Mat  > & CM,  cv::Mat &  M)
{
    CM.send(M);

}
void rcv1(circ_buffer<cv::Mat > & CV, cv::Mat  & M)
{
    M = CV.receive();
}

然后运行它在主函数中：

int main()
{
    ScreenStreamer stream;
    CVUtils::Image m_img;
    cv::Mat bufImg;
    cv::Mat inpImg;
    int key = 0;
    circ_buffer<cv::Mat > F1;
    F1.set_capacity(50);

    std::thread m1( snd1, F1, &inpImg );
    std::thread m2( rcv1, F1, &bufImg );
    std::thread m3( cnt, stream, &inpImg);

    m1.join();
    m2.join();
    m3.join();
    return 0;
}

不幸的是我得到了这个错误

Error   C2664   'std::tuple<void (__cdecl *)(circ_buffer<cv::Mat> &,cv::Mat &),circ_buffer<cv::Mat>,cv::Mat *>::tuple(std::tuple<void (__cdecl *)(circ_buffer<cv::Mat> &,cv::Mat &),circ_buffer<cv::Mat>,cv::Mat *> &&)': cannot convert argument 1 from 'void (__cdecl &)(circ_buffer<cv::Mat> &,cv::Mat &)' to 'std::allocator_arg_t' CVUtilsExperimental C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include\memory   1630

它是来自模板实现还是来自函数实现？用什么google来解决呢？

Answer 1

你的所有函数都通过引用获取参数，你需要使用 std::ref 包装器 class 将它们传递给线程构造函数：

The arguments to the thread function are moved or copied by value. If a reference argument needs to be passed to the thread function, it has to be wrapped (e.g. with std::ref or std::cref). thread reference

所以重写如下

std::thread m1( snd1, ref(F1), ref(inpImg) );
std::thread m2( rcv1, ref(F1), ref(bufImg) );
std::thread m3( cnt, ref(stream), ref(inpImg) );

opencv 的循环缓冲区 cv::Mat

circular buffer for opencv cv::Mat

multithreading

boost

opencv

circular-buffer