Question

我正在尝试编译该代码（来自gpu示例的houghlines.cpp）：

#include <cmath>
#include <iostream>

#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/gpu/gpu.hpp"
#include <stdlib.h>
#include <stdio.h>

using namespace std;
using namespace cv;
using namespace cv::gpu;

static void help()
{
    cout << "This program demonstrates line finding with the Hough transform." << endl;
    cout << "Usage:" << endl;
    cout << "./gpu-example-houghlines <image_name>, Default is pic1.png\n" << endl;
}

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

    const string filename = argc >= 2 ? argv[1] : "~/Images/skorn00.png";

    Mat src = imread(filename, IMREAD_GRAYSCALE);
    if (src.empty())
    {
        help();
        cout << "can not open " << filename << endl;
        return -1;
    }

    Mat mask;
    Canny(src, mask, 100, 200, 3);

    Mat dst_cpu;
    cvtColor(mask, dst_cpu, CV_GRAY2BGR);
    Mat dst_gpu = dst_cpu.clone();

    vector<Vec4i> lines_cpu;
    {
        const int64 start = getTickCount();

        HoughLinesP(mask, lines_cpu, 1, CV_PI / 180, 50, 60, 5);

        const double timeSec = (getTickCount() - start) / getTickFrequency();
        cout << "CPU Time : " << timeSec * 1000 << " ms" << endl;
        cout << "CPU Found : " << lines_cpu.size() << endl;
    }

    for (size_t i = 0; i < lines_cpu.size(); ++i)
    {
        Vec4i l = lines_cpu[i];
        line(dst_cpu, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0, 0, 255), 3, CV_AA);
    }

    GpuMat d_src(mask);
    GpuMat d_lines;
    HoughLinesBuf d_buf;
    {
        const int64 start = getTickCount();

        gpu::HoughLinesP(d_src, d_lines, d_buf, 1.0f, (float) (CV_PI / 180.0f), 50, 5);

        const double timeSec = (getTickCount() - start) / getTickFrequency();
        cout << "GPU Time : " << timeSec * 1000 << " ms" << endl;
        cout << "GPU Found : " << d_lines.cols << endl;
    }
    vector<Vec4i> lines_gpu;
    if (!d_lines.empty())
    {
        lines_gpu.resize(d_lines.cols);
        Mat h_lines(1, d_lines.cols, CV_32SC4, &lines_gpu[0]);
        d_lines.download(h_lines);
    }

    for (size_t i = 0; i < lines_gpu.size(); ++i)
    {
        Vec4i l = lines_gpu[i];
        line(dst_gpu, Point(l[0], l[1]), Point(l[2], l[3]), Scalar(0, 0, 255), 3, CV_AA);
    }

    imshow("source", src);
    imshow("detected lines [CPU]", dst_cpu);
    imshow("detected lines [GPU]", dst_gpu);
    waitKey();

    return 0;
}

但是在跑完之后我收到了这条消息（执行）： / workspace / test_opencv / test_opencv / bin / Release / test_opencv：加载共享库时出错：libopencv_gpu.so.2.4：无法打开共享对象文件：没有这样的文件或目录

这是构建： -------------- Build：在test_gpu中发布（编译器：GNU GCC编译器）---------------

g ++ -Wall -fexceptions -O2 -I / usr / local / include -I / usr / local / include / opencv -c /home/thomas/workspace/test_opencv/test_gpu/main.cpp -o obj / Release / main.o g ++ -L / usr / local / include -L / usr / local / include / opencv -o bin / Release / test_gpu obj / Release / main.o -s /usr/local/lib/libopencv_calib3d.so / usr / local / lib / libopencv_contrib.so /usr/local/lib/libopencv_core.so /usr/local/lib/libopencv_features2d.so /usr/local/lib/libopencv_flann.so /usr/local/lib/libopencv_gpu.so / usr / local / lib / libopencv_highgui.so /usr/local/lib/libopencv_imgproc.so /usr/local/lib/libopencv_legacy.so /usr/local/lib/libopencv_ml.so /usr/local/lib/libopencv_nonfree.so / usr / local / lib / libopencv_objdetect.so /usr/local/lib/libopencv_photo.so /usr/local/lib/libopencv_stitching.so /usr/local/lib/libopencv_superres.so /usr/local/lib/libopencv_ts.so / usr / local / lib / libopencv_video.so /usr/local/lib/libopencv_videostab.so 输出大小为14,44 KB 进程终止，状态为0（0分钟，1秒） 0个错误，0个警告（0分钟，1秒）

来自cpu示例的houghines.cpp运行良好。它似乎来自libopen_gpu库编译。编译opencv WITH_CUDA时，CMAKE不会返回错误。怎么了？

Answer 1

似乎与此处的问题相同：openCV program compile error "libopencv_core.so.2.4: cannot open shared object file: No such file or directory" in ubuntu 12.04，正确配置所有内容并且应该运行。

Answer 2

我发现了问题，这是我所期待的：我在源文件中添加： cv::gpu::printShortCudaDeviceInfo(cv::gpu::getDevice());

它又回来了： OpenCV Error: No GPU support (The library is compiled without CUDA support) in getDevice, file /build/buildd/opencv-2.4.2+dfsg/modules/core/src/gpumat.cpp, line 182 terminate called after throwing an instance of 'cv::Exception' what(): /build/buildd/opencv-2.4.2+dfsg/modules/core/src/gpumat.cpp:182: error: (-216) The library is compiled without CUDA support in function getDevice

现在我必须用cuda（CMAKE）编译opencv。但我曾经做过这一部分......

libopencv_gpu.so.2.4：无法打开共享对象文件：没有这样的文件或目录

2 个答案: