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Surf_Gpu needs Cuda ?

asked 2017-04-15 04:00:57 -0500

DEHANDPI gravatar image

I'm applying Surf_Gpu algorithm with OpenCv on Qt. When I run the code (here is the critical function):

void surf(Mat img,QString j)
{

int MinHessian=400;
GpuMat imgGpu;
imgGpu.upload(img);
SURF_GPU algo(MinHessian);

vector<KeyPoint> keypointsCPU;
vector<float> descriptorsCPU;
GpuMat descriptors,keypoints;
algo(imgGpu,GpuMat(),keypoints,descriptors,false);

algo.downloadKeypoints(keypoints, keypointsCPU);
 algo.downloadDescriptors(descriptors, descriptorsCPU);
 // from device to host

 string path;
if(j=="requete")
    path = "requete.txt";
else
    path = "SURF/" + j.toStdString().substr(0,j.toStdString().find(".")) +".txt";
FileStorage fs(path, FileStorage::WRITE);
fs << "SURF" << descriptorsCPU;
fs.release();
}

I have the following error message :

OpenCV Error: No GPU support (The library is compiled without CUDA support) in mallocPitch, file /build/buildd/opencv-2.4.8+dfsg1/modules/dynamicuda/include/opencv2/dynamicuda/dynamicuda.hpp, line 126 terminate called after throwing an instance of 'cv::Exception' what(): /build/buildd/opencv-2.4.8+dfsg1/modules/dynamicuda/include/opencv2/dynamicuda/dynamicuda.hpp:126: error: (-216) The library is compiled without CUDA support in function mallocPitch

though I don't explicitely use Cuda... Here are my includes:

#include <stdio.h>
#include <QMainWindow>
#include <QFileDialog>
#include <QImage>
#include <QStandardItemModel>
#include <QItemSelectionModel>
#include <QMessageBox>
// #include <highgui.h>
#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>
#include <opencv2/features2d/features2d.hpp>
#include <opencv2/nonfree/nonfree.hpp>
#include <opencv2/nonfree/features2d.hpp>
#include <opencv2/nonfree/gpu.hpp>
#include <opencv2/stitching/detail/matchers.hpp>
// for BFMatcher
#include <opencv2/gpu/gpu.hpp>
#include <fstream>
#include <sstream>
#include <iostream>
#include <QTime>
#include <sstream>
#include <QString>

What shall I need to do to get rid of the error ? Thanks !

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answered 2017-04-15 04:19:39 -0500

berak gravatar image

updated 2017-04-15 04:21:17 -0500

well, you can't use GpuMat, SURF_GPU (or anything with gpu in it) without CUDA support built into the opencv libs at compile time

to achieve it, you'd have to

  • have hardware, that supports CUDA
  • get more recent opencv src (2.4.8 is very old)
  • get a recent CUDA sdk (v 8.0, iirc)
  • rebuild opencv libs from src with cmake -DWITH_CUDA=ON

opencv-2.4.8+dfsg1 looks like something very outdated, that you grabbed pre-built from some package manager. those versions are all "plain vanilla", and do not have any hardware support (apart from opencl, maybe)

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Comments

Thanks for your answer. Actually, the latest version of opencv I have is 2.4.10. I saw that there are one version of each lib-corresponding to the version of opencv. In my .pro in Qt, when I add the libs, how can I be sure that it's the latest version (apparently, it's not the case yet, because the error message tell it's opencv 2.4.8). Thanks!

DEHANDPI gravatar imageDEHANDPI ( 2017-04-15 04:44:31 -0500 )edit

"how can I be sure that it's the latest version" -- build from github src

even if you want to stay on outdated 2.4 branch, latest current release is 2.4.13.2

berak gravatar imageberak ( 2017-04-15 04:48:04 -0500 )edit

I looked at this : http://stackoverflow.com/questions/12910902/opencv-error-no-gpu-support-library-is-compiled-without-cuda-support (link text) and it seems that Cuda was well supported with older opencv versions... I checked the cmake; the WITH_CUDA is well on. So I don't know from where it could come. Do you have any more idea?

DEHANDPI gravatar imageDEHANDPI ( 2017-04-15 08:22:56 -0500 )edit

check cerr << cv::getBuildInformation(); to see, what hardware support actually made it into your opencv libs

(yes, older 2.4 version supported cuda, too, but yours was obviously build without)

berak gravatar imageberak ( 2017-04-15 08:26:02 -0500 )edit

Thanks Berak Here is what I have:

Unavailable:                 androidcamera dynamicuda

Indeed... But why is it opencv 2.4.8 that is used although the opencv 2.4.10 is also built, WITH_CUDA on? How can I "switch" from 2.4.8 to 2.4.10 in my Qt program? Maybe a silly question but I'm quite new with all this (student). Thanks for help/interesting link !

DEHANDPI gravatar imageDEHANDPI ( 2017-04-16 05:13:39 -0500 )edit

@berak Could you have a look at my previous comment please?

DEHANDPI gravatar imageDEHANDPI ( 2017-04-19 07:32:32 -0500 )edit

@SurfMan, sorry, i have no idea.

berak gravatar imageberak ( 2017-04-19 09:44:32 -0500 )edit
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Asked: 2017-04-15 04:00:57 -0500

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Last updated: Apr 15 '17