stitching 2 images together in CUDA like hconcat?

edit

I made this hconcat function, I hope it helps.

void custom_hconcat(const cv::cuda::GpuMat src1, const cv::cuda::GpuMat src2, cv::cuda::GpuMat& result) {

    int size_cols = src1.cols + src2.cols;
    int size_rows = std::max(src1.rows, src2.rows);
    cv::cuda::GpuMat hconcat(size_rows, size_cols, src1.type());
    src2.copyTo(hconcat(cv::Rect(0, 0, src2.cols, src2.rows)));
    src1.copyTo(hconcat(cv::Rect(src2.cols, 0, src1.cols, src1.rows)));

    result = hconcat.clone();
}

You can allocate a matrix of the correct size and then copy the images into the new matrix manually with the following:

cv::cuda::GpuMat NewImg(img1.rows, img1.cols + img2.cols, img1.type);
img1.copyTo(NewImg(cv::Rect(0,0,img1.cols,img1.rows)));
img2.copyTo(NewImg(cv::Rect(img1.cols,img1.rows, img2.cols,img2.rows)));