Patent ID: 8134641

Claim:
A method of processing a video signal, the method comprising: receiving a video signal in an interlaced scanning mode format, which has a first field and a second field; determining whether the first field and the second field of the video signal in the interlaced scanning mode format which is received are inverted with respect to each other; recovering the first field and the second field if the first field and the second field are determined to be inverted with respect to each other; and generating a video signal in a progressive scanning mode format based on the first field and the second field which are recovered; wherein the determining whether the first field and the second field are inverted with respect to each other comprises determining whether numbers of back porches and front porches of the first field and the second field are equal to a preset number; wherein the numbers of front porches equals a number of horizontal synchronous signals of a video signal during a time beginning when a data enable signal changes from a first enable state to a second enable state and ending when a vertical synchronous signal changes from a first synch state to a second synch state, and wherein the numbers of back porches equals a number of horizontal synchronous signals of a video signal during a time beginning when the vertical synchronous signal changes from the second synch state to the first synch state and ending when the data enable signal changes from the second enable state to the first enable state.