Image<,> won't dispose using EmguCV

Question

This question was asked by a lot but none answered! I am using EmguCV, the OpenCV wrapper for .NET. I am disposing all created objects but my app is still using more and more memory till it crashes. I nearly tried everything, including: .Dispose() =null using() and even GC was running nearly every half a second, nothing did work! Here's my code:

(I have selected 100 scanned images, all of JPG type and 300dpi) One of these images is uploaded to DropBox in order to preserve quality: https://www.dropbox.com/s/tsbe8pesbxk7dsz/Example.jpg?dl=0

private void OpenFolder_Click(object sender, EventArgs e)
{
    using (OpenFileDialog open = new OpenFileDialog())
    {
        open.Multiselect = true;
        if (open.ShowDialog() == DialogResult.OK)
            for (int i = 0; i < open.FileNames.Count(); i++)
                using (Image<Bgr, byte> ToProcess = new Image<Bgr, byte>(open.FileNames[i]))
                    ProcessImage (ToProcess);
    }
}

private void ProcessImage (Image<Bgr, byte> imgInput)
{
    imgInput._SmoothGaussian(5);            
}

Also I tried to update the code inside ProcessImage Function to the following, but my program freezes and crashes!

IntPtr image = imgInput;
imgInput._SmoothGaussian(5);
CvInvoke.cvReleaseImage(ref image);

Important Update: if the function finishes before my program crashes, surprisingly it will release All of the memory. Here is a graph.

I am using VS 2017-Community, Win10 64-bit, both up to date, and last stable version of EmguCV 3.4.3