Patent ID: 7961251

Claim:
A method for converting, by a computer, video data in a first video format to video data in a second interlaced video format comprising: receiving said video data in the first video format; determining, from the received video data, a number of frames of the first video format to map into a frame of the second video format, the frame of the second video format having four fields; determining, selectively based on said received video data, a number of lines from each of the determined number of frames of the first video format to be mapped into each of the four fields of the frame of the second video format such that each of the four fields contains, according to the selection, either (i), according to a sub-selection, a predefined number lines, a number of lines equal to an integer multiple of the predefined number of lines, or a number of lines equal to a downscaled, even multiple of the predefined number of lines, or (ii) a number of lines equal to the number of lines in a frame of the first video format divided by four, selecting the determined number of lines from each of the number of frames of the first video format; providing a set of permutations of sequences, a permutation of said set mapping the number of selected lines into the fields of the frame of the second video format; selecting, by said computer and from among said set, said permutation, the number of permutations being based upon the number of fields in the frame of the second video format; and mapping the selected lines from each of the number frames of the first video format into the four fields of the frame of the second video format according to the determined sequence.