Patent ID: 7420626

Claim:
A method of detecting a change in a sequence of video data fields generated from a progressive scan source comprising: receiving first and second interlaced fields of a corresponding progressive scan frame from a sequence of interlaced fields generated from a progressive scan source; weaving pixel values corresponding to pixel positions of pixel lines of a first parity of the first field with pixel values corresponding to pixel positions of pixel lines of a second parity of the second field; for each pixel value corresponding to each pixel position of each pixel line of the second field after weaving, checking for the corresponding pixel position for feathering due to motion; counting detected pixel positions with feathering due to motion; comparing a number of counted pixel positions with feathering due to motion against a threshold value; determining that the sequence of fields generated from the progressive scan source has not changed when the number of counted pixel positions with feathering due to motion is below the threshold value; and determining that the sequence of fields generated from the progressive scan source has changed when the number of counted pixel positions with feathering due to motion is above the threshold value.