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Abstract

A system and method for performing motion compensation in an MPEG video decoder. The system comprises a horizontal half pixel compensation arrangement including multiple adders and multiplexers which perform horizontal half pixel compensation using an addition function, a division function, and a modulo function on pixel data. The system also includes a register bank which provides the ability to store an array of reference data when vertical half pixel compensation is required. The system also includes a verical half pixel compensation arrangement, which also includes multiple adders and multiplexers which perform vertical half pixel compensation using an addition function, a division function, and a modulo function on pixel data. Reference data and odd pixel data is transferred into and within the system in a predetermined arrangement. Reference and odd pel data may comprise either luma or chroma data. Different picture types, prediction types, and pixel compensation requirements yield different data fetching schemes for luma and chroma data, and different reference motion vector data causes different luma and chroma transference to the motion compensation unit. The system also performs reference data averaging between various frames using a B-picture compensation unit, which operates when B-pictures with backward and forward motion vectors or P-pictures with dual-prime prediction occur.

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First Claim