Patent ID: 7336316
Filing Date: 2008-02-26
Classification: H04N

Abstract:
1. A method for deriving a progressive scan image from an interlaced image, in which for each pixel to be inserted in a field from the interlaced image, the method performs the steps of: deriving a difference value from each pair of a set of pairs of symmetrically opposed pixels with respect to the pixel and from adjacent lines to the pixel to be inserted; determining which pair of pixels has the lowest difference value associated with it; and selecting as the value of the pixel to be inserted, the average of the pair of pixels which has the lowest difference value; wherein the step of selecting the value of the pixel to be inserted includes comparing the average value of the pair of pixels with the lowest difference value with a range of values defined by the values of the pixels directly above and directly below the pixel to be inserted, and clamping the value of the pixel to be inserted to a point in the range in dependence on the result of the comparison.