Create HDR image using opencv in C#

Question

Hi I'm new in C# and i need to create a HDR in C# using Emgu CV library. I get image from binary file. Need To merge two images vertically (one on top of the other) this two images in one image. Please help me to solve the problem.

Mat imageToPross = img.Mat;
Rectangle roi1 = new Rectangle(0, 0, imageToPross.Width, imageToPross.Height / 2);
Rectangle roi2 = new Rectangle(0, imageToPross.Height / 2, imageToPross.Width, imageToPross.Height / 2);
Mat currImage = imageToPross.Clone();
Mat result = new Mat(currImage, roi1);
Mat result2 = new Mat(currImage, roi2);
Mat[] images = { result, result2 };
MergeMertens merge_mertens = new MergeMertens();
merge_mertens.Process( images, fusion);

In merge_mertens i get error cannot convert from Mat to InputArray