Patent ID: 7944503

Claim:
A method of edge vector determination for de-interlacing interpolation of a video field, comprising the steps of: (a) for a target pixel to be found by intra-field interpolation, computing a first edge vector for said target pixel, said first edge vector with pixel-resolution and within the range of −N to N, wherein N is an integer greater than 4; (b) determining a confidence factor for said pixel-resolution edge vector; (c) when said confidence factor is greater than a threshold, computing a first refinement edge vector for said target pixel, said first refinement edge vector with sub-pixel-resolution and said computing by shifting field lines about said target pixel according to said first edge vector and then finding a sub-pixel-resolution edge vector in a window of shifted field pixels about said target pixel; (d) when said confidence factor is not greater than said threshold, setting said first edge vector equal to 0 and computing a first refinement edge vector for said target pixel, said first refinement edge vector with sub-pixel-resolution and said computing by finding a sub-pixel-resolution edge vector in a window of field pixels about said target pixel; and (e) after said computing a first refinement edge vector, computing a final edge vector for said target pixel as the sum of said first edge vector and said first refinement edge vector.