Display Image from File using GPU (C++ / OpenCV)

Question

I'm following an example to use the GPU to manipulate and display an image from file with C++ / OpenCV (from here: http://on-demand.gputechconf.com/gtc/2013/webinar/opencv-gtc-express-shalini-gupta.pdf ). The code is:

#include <opencv2/opencv.hpp>
#include <opencv2/gpu/gpu.hpp>
#include <opencv2/gpu/gpumat.hpp>
using namespace cv;
int main()
{
    Mat src = imread("car1080.jpg", 0);
    if (!src.data) exit(1);
    gpu::GpuMat d_src(src);
    gpu::GpuMat d_dst;
    gpu::bilateralFilter(d_src, gpu::Canny(d_dst, d_dst, 35, 200, 3);
    Mat dst(d_dst);
    imshow("out.png", dst);
    return 0;
}

However, I keep getting an error stating d_dst is undefined for the gpu::GpuMat d_src(src) and gpu::GpuMat d_dst sections. From what I've read this is because I haven't included a file, a declaration or something else.

Below is a list of my additional dependencies:

opencv_calib3d249d.lib
opencv_contrib249d.lib
opencv_core249d.lib
opencv_features2d249d.lib
opencv_flann249d.lib
opencv_gpu249d.lib
opencv_highgui249d.lib
opencv_imgproc249d.lib
opencv_legacy249d.lib
opencv_ml249d.lib
opencv_nonfree249d.lib
opencv_objdetect249d.lib
opencv_photo249d.lib
opencv_stitching249d.lib
opencv_superres249d.lib
opencv_ts249d.lib
opencv_video249d.lib
opencv_videostab249d.lib

I'm new to all of this so I'm unsure whether I've missed an additional dependency, a header or need to install / configure some GPU component with Visual Studio 2012.

Any help would be greatly appreciated! Thanks!

UPDATE : Below is my new code which compiles fine; however, no image is displayed even when the imwrite line is replaced with imshow . EDIT I now realise that my code is getting stopped at the if (!src.data) exit(1); line presumably because the image file is not being read properly?

#include <stdio.h>
#include <direct.h>
#include "fstream"
#include "iostream"
#include <vector>
#include "opencv2/core/core.hpp"
#include "opencv2/core/gpumat.hpp"
#include "opencv2/core/opengl_interop.hpp"
#include "opencv2/gpu/gpu.hpp"
#include "opencv2/ml/ml.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/contrib/contrib.hpp"
#include "opencv2/video/tracking.hpp"
#include "opencv2/imgproc/imgproc.hpp"

int main(){
Mat src = imread("car.jpg", 0);
if (!src.data) exit(1);

gpu::GpuMat d_src(src);
gpu::GpuMat d_dst;

gpu::bilateralFilter(d_src, d_dst,15, 80,80);

Mat dst(d_dst);
imwrite("out.png", dst);
return 0;
}

Note - I probably don't need all those #includes but oh well.

Answer 1

Try to include core.hpp. In my case it is located in opencv2/core/core.hpp

And you have to fix your function calls for bilateralFilter(...) and Canny(...). The argument number is wrong.

Somegthing like this:

int main(){
Mat src = imread("car.jpg", 0);
if (!src.data) exit(1);

gpu::GpuMat d_src(src);
gpu::GpuMat d_dst;

gpu::bilateralFilter(d_src, d_dst,15, 80,80);

Mat dst(d_dst);
imwrite("out.png", dst);
return 0;
}

You haven't mentioned anything about your development environment... (Win,Linux,Android,OpenCV version).

I work on a tegra board so things might be a little bit different for me.I tried out the example on my development environment. And it worked just fine.

cool hu!