Patent ID: 8026979

Claim:
A method for picture resampling from a first resolution picture to a second-resolution picture said method comprising: a) determining a first-resolution sample position corresponding to a sample position in a second-resolution picture, wherein said first resolution sample position is determined according to: { p x , L ⁡ ( x ) = [ ( x - x orig ) · w base · R L + R L 2 ⁢ ( w base - w extract ) ] / w extract p x , L ⁡ ( y ) = [ ( y - y orig ) · h base · R L + R L 2 ⁢ ( h base - h extract ) ] / h extract ; wherein (p x,L (x), p y,L (y)) represent the first resolution sample position in units of 1 R L , (x, y) represent the second resolution sample position, (x orig , y orig ) represent the upper, left corner of a sub-region of said second resolution picture from which said first resolution picture is sampled, w base and h base are the width and height, respectively, of the second resolution picture, w extract and h extract are the width and height, respectively, of the sub-region of said second resolution picture from which said first resolution picture is sampled and R L is the interpolation resolution; b) storing filter data defining a plurality of unique filter options, wherein the quantity of said unique filter options is equal to said interpolation resolution, R L , wherein each of said unique filter options corresponds to a value of one of said (p x,L (x), p y,L (y)); c) obtaining filter data for one of said unique filter options based on a value of said (p x,L (x), p y,L (y)) determined in said determining; and d) filtering said first resolution picture with a filter using said one of said unique filter options thereby producing a filtered field.