Access Violation Exception mystery

I've been working with EMGU+OpenCV for quite some time and ran into this AccessViolationException mystery.

First thing first, the code:

class AVE_Simulation
    {
        public static int Width = 7500;
        public static int Height = 7500;
        public static Emgu.CV.Image<Rgb, float>[] Images;

        static void Main(string[] args)
        {
            int N = 50;
            int Threads = 5;

            Images = new Emgu.CV.Image<Rgb, float>[N];
            Console.WriteLine("Start");

            ParallelOptions po = new ParallelOptions();
            po.MaxDegreeOfParallelism = Threads;
            System.Threading.Tasks.Parallel.For(0, N, po, new Action<int>((i) =>
            {
                Images[i] = GetRandomImage();
                Console.WriteLine("Prossing image: " + i);
                Images[i].SmoothBilatral(15, 50, 50);
                GC.Collect();
            }));
            Console.WriteLine("End");
        }

        public static Emgu.CV.Image<Rgb, float> GetRandomImage()
        {
            Emgu.CV.Image<Rgb, float> im = new Emgu.CV.Image<Rgb, float>(Width, Height);

            float[, ,] d = im.Data;
            Random r = new Random((int)DateTime.Now.Ticks);

            for (int y = 0; y < Height; y++)
            {
                for (int x = 0; x < Width; x++)
                {
                    d[y, x, 0] = (float)r.Next(255);
                    d[y, x, 1] = (float)r.Next(255);
                    d[y, x, 2] = (float)r.Next(255);
                }
            }
            return im;
        }

    }

The code is simple. Allocate an array of images. Generate a random image and populate it with random numbers. Execute bilateral filter over the image. That's it.

If I execute this program in a single thread, (Threads=1) everything seems to work normally with no problem. But, if I raise the number of concurrent t