hi

       Can anybody share code or algorithm(using pattern
       recognition) for image comparision in   .net .       
       I need to compare 2 images of different resolution and textures
       and the find the difference . Now i have code to find the difference
       between 2 images using C#

// Load the images. Bitmap bm1 = (Bitmap) (Image.FromFile(txtFile1.Text)); Bitmap bm2 = (Bitmap) (Image.FromFile(txtFile2.Text));

        // Make a difference image.
        int wid = Math.Min(bm1.Width, bm2.Width);
        int hgt = Math.Min(bm1.Height, bm2.Height);
        Bitmap bm3 = new Bitmap(wid, hgt);

        // Create the difference image.
        bool are_identical = true;
        int r1;
        int g1;
        int b1;
        int r2;
        int g2;
        int b2;
        int r3;
        int g3;
        int b3;
        Color eq_color = Color.Transparent;
        Color ne_color = Color.Transparent;
        for (int x = 0; x <= wid - 1; x++)
        {
            for (int y = 0; y <= hgt - 1; y++)
            {
                if (bm1.GetPixel(x, y).Equals(bm2.GetPixel(x, y)))
                {
                    bm3.SetPixel(x, y, eq_color);
                }
                else
                {
                    bm1.SetPixel(x, y, ne_color);
                    are_identical = false;
                }
            }
        }

        // Display the result.
        picResult.Image = bm1;

        Bitmap Logo = new Bitmap(picResult.Image);
        Logo.MakeTransparent(Logo.GetPixel(1, 1));
        picResult.Image = (Image)Logo;

        //this.Cursor = Cursors.Default;
        if ((bm1.Width != bm2.Width) || (bm1.Height != bm2.Height))
        {
            are_identical = false;
        }
        if (are_identical)
        {
            MessageBox.Show("The images are identical");
        }
        else
        {
            MessageBox.Show("The images are different");
        }

        //bm1.Dispose()
        // bm2.Dispose()

     BUT this compare if the 2 images are of same resolution and size.if some
     shadow is there on one image(but the 2 images are same) it shows the difference
     between the image..so i am trying to compare using pattern recognition. 

Thanks in advance