Patent ID: 8233084

Claim:
A method for detecting a correct video field parity pattern in a video signal comprising a plurality of interlaced video fields, wherein each video field includes a plurality of pixels located in a plurality of positions in a plurality of scan lines, the method comprising: receiving, by at least two line buffers, pixel data of a plurality of current pixels in a current video field, and pixel data of a plurality of first pixels in a first previous video field, wherein the first previous video field immediately precedes the current video field and together form an image frame; determining, by a field parity determination circuit, for each of the plurality of current pixels in the current video field, a first set of absolute differences between a current pixel in a current position in a current scan line and at least one first pixel in the current position in at least one vertically adjacent scan line relative to the current scan line, wherein the first set of absolute differences is based on a first field parity pattern; determining, by the field parity determination circuit, for each of the plurality of current pixels in the current video field, a second set of absolute differences between a current pixel in a current position in a current scan line and at least one first pixel in the current position in at least one vertically adjacent scan line relative to the current scan line, wherein the second set of absolute differences is based on a second field parity pattern; determining by the field parity determination circuit, a first accumulated value based on a sum total of each of the first set of absolute differences and a second accumulated value based on a sum total of each of the second set of absolute differences; and determining by the field parity determination circuit, a correct field parity pattern of the current video field based on the first accumulated value and the second accumulated value by: at least one of determining a first sum of the first accumulated value and a threshold value and determining a first product of the first accumulated value and a field parity factor; and determining the correct field parity pattern of the current video field to be the first field parity pattern when the second accumulated value is greater than at least one of the determined first sum and the determined first product.