What is the good Database for image processing programming ?

 1.public static bool ImageCompareString(Bitmap firstImage, Bitmap secondImage)
 2: {
 3:     MemoryStream ms = new MemoryStream();
 4:     firstImage.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
 5:     String firstBitmap = Convert.ToBase64String(ms.ToArray());
 6:     ms.Position = 0;
 7:
 8:     secondImage.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
 9:     String secondBitmap = Convert.ToBase64String(ms.ToArray());
10:
11:     if (firstBitmap.Equals(secondBitmap))
12:     {
13:         return true;
14:     }
15:     else
16:     {
17:         return false;
18:     }
19: }