Kodierung und Dekodierung zur Videokompression mit automatischer Halbbild/Bild Bewegungskompensation auf der Subpixelebene

摘要

An input frame to be motion compensated is partitioned into smaller blocks of pixel data. First, motion estimation is performed on each block in the full-pixel resolution. Then, the full-pixel resolution motion vector is refined to half-pixel accuracy by searching the surrounding half-pixel resolution blocks in the vertical and horizontal position with respect to the full-pixel resolution motion vector. An absolute magnitude of a horizontal component of the full-pixel resolution motion vector is examined to see if it is greater or less than a predetermined threshold to detect any significant movement. If the horizontal component absolute magnitude is less than the threshold, a frame-based interpolation will be used for forming the sub-pixel resolution block. If the horizontal component absolute magnitude is greater than the threshold, a field-based interpolation will be used instead. The sub-pixel resolution block is subjected to motion estimation and compensation to obtain a predicted block which will then be coded to obtain a coded bit stream. <IMAGE>