gpumat和垫错误 [英] error with gpumat and mat

问题描述

当我编译此示例时:

#include <iostream>
#include "opencv2/opencv.hpp"
#include "opencv2/gpu/gpu.hpp"

int main (int argc, char* argv[])

{
    try
    {
        cv::Mat src_host = cv::imread("file.png", CV_LOAD_IMAGE_GRAYSCALE);
        cv::gpu::GpuMat dst, src;
        src.upload(src_host);

        cv::gpu::threshold(src, dst, 128.0, 255.0, CV_THRESH_BINARY);

        cv::Mat result_host = dst;
        cv::imshow("Result", result_host);
        cv::waitKey();
    }
    catch(const cv::Exception& ex)
    {
        std::cout << "Error: " << ex.what() << std::endl;
    }
    return 0;
}

---

我遇到以下错误:

---

I got the following error:

threshold.cpp: In function ‘int main(int, char**)’:
threshold.cpp:19: error: conversion from ‘cv::gpu::GpuMat’ to non-scalar type ‘cv::Mat’ requested

有人知道为什么吗?

推荐答案

在当前版本的OpenCV中，cv::Mat类没有使用参数cv::gpu::GpuMat类型的重载赋值运算符或复制构造函数.因此，下面的代码行将无法编译.

In the current versions of OpenCV, the cv::Mat class has no overloaded assignment operator or copy constructor which takes argument of type cv::gpu::GpuMat. So the following line of your code will not compile.

cv::Mat result_host = dst;

有2种替代方法.

首先，您可以将dst作为result_host的构造函数的参数传递.

First you can pass the dst as the argument of the constructor of result_host.

cv::Mat result_host(dst);

第二个是您可以调用dst

cv::Mat result_host;
dst.download(result_host);

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