6. The computer-implemented method according to claim 5 , wherein said preprocessing steps include an RGB conversion procedure comprising the steps of: converting said Arabic historical manuscript images from an RGB color space to gray-scale images; converting said gray-scale images to binary images by performing calculations characterized by the relation: I binary ⁡ ( n , m ) = { 1 if ⁢ ⁢ I grayscale ⁡ ( n , m ) > T 0 otherwise where T is an intensity threshold, I grayscale is a grayscale image, I binary is a binary image and (n, m) are the coordinates of an individual pixel within said gray-scale image and said binary image.
5. The computer-implemented method according to claim 1 , further comprising preprocessing steps adapted for enhancing efficiency of said circular polar grid features extraction step.