| abstract |
ABSTRACT A method for reducing noise in a reference frame of video information by determining the mean absolute difference, MAD0, between each block in the reference frame and identically located blocks in adjacent frames. If MAD0 is < A, the block in an adjacent frame is held for averaging with the block in the reference frame, but if MAD0 for the block is > A, a search is made for a block in the adjacent frame that matches the block in the reference frame. This is labelled MADmin. If MAD0 for the block in the adjacent frame is < BMADmin, the matching block is not used in the average. If MAD0 is not < BMADmin, the matching block can be used in the average, but preferably this is not done if MADmin exceeds a value C. The values of A, B and C are determined by experience for the block size used. |