Patent ID: 8031969
Filing Date: 2011-10-04
Classification: G06T

Abstract:
1. A computer implemented method for selecting an anisotropic filter level, comprising steps of: determining a set of available anisotropic filter levels and a threshold value; obtaining an image; performing a Fourier transform on the image to produce Fourier transformed image components, wherein the Fourier transformed image components include low frequency components situated near the corners of the image and high frequency components situated near the center of the image; normalizing the Fourier transformed image components by remapping the high frequency components toward an edge of the image and low frequency components toward the center of the image; defining a set of Fourier buckets, wherein each Fourier bucket corresponds to a different range of frequencies and includes one or more Fourier transformed image components from the normalized Fourier transformed image components, the frequency associated with each of the one or more Fourier transformed image components falling within the range of frequencies corresponding to the Fourier bucket; identifying a first Fourier bucket in the set of Fourier buckets that includes a first Fourier transformed image component that is closest to but does not exceed the threshold value; selecting the anisotropic filter level based on the identified first Fourier bucket that includes the first Fourier transformed image component and a mapping between the set of Fourier buckets and the set of available anisotropic filter levels; and appending the anisotropic filter level to the image so that, when the image is read, the anisotropic filer level is read.