Patent ID: 8326050

Claim:
A method for down-sampling an xM by yN image, comprising: sampling an xM by yN image into a 3M by 3N image; detecting one or more edges in the 3M by 3N image; determining a direction for each of the one or more edges; applying a filter adaptively on the 3M by 3N image based on the one or more edges and the direction determined for each of the one or more edges; and subpixel-based down-sampling the 3M by 3N image, after filtering, into a M by N image; wherein the direction determined for each of the one or more edges is one of a horizontal direction, a vertical direction, a left diagonal direction and a right diagonal direction; wherein said filter is applied in a direction orthogonal to the direction of an edge; and wherein said filter has a cutoff frequency greater than π/3 and less than π.