1. A method for deriving descriptor of an image area having a plurality of pixels, the interest point having a location in the image and a scale, the method comprising: identifying a neighborhood around the interest point location proportional in size to the interest point's scale, the neighborhood being divided into subregions, each subregion comprising a set of pixels; creating a frequency domain representation of each subregion; normalizing frequency domain coefficients; selecting the normalized frequency domain coefficients to comprise a multidimensional descriptor.