Intra-makroblokk DC og AC koeffisientforutsigelse for linjesprangbasert digital video

摘要

DC and AC DCT transform coefficients of anINTRA coded block (310) are differentially encodedby selecting predictor DC and AC coefficients from aleft-hand neighboring block (320) and a topneighboring block (340). Each block (310, 320, 340)is coded according to a frame mode, a reorderedfield mode, and a non-reordered field mode. The ACpredictor block is selected according to therespective coding modes of the blocks, and the blockin which a DC predictor resides. The top block(340) is selected as an AC predictor when the topblock (340) and current block (310) are bothreordered field mode, or both frame mode and/ornon-reordered field mode, and the DC predictorresides in the top block. Zeroed AC spatialtransform coefficients are used in place of the ACspatial transform coefficients from the selectedblock when the selected block is not INTRA coded, ordoes not reside in the same Video Object Plane (VOP)as the current block. DC coefficients may benon-linearly quantized.