MOTION ESTIMATION AND COMPENSATION DEVICE WITH MOTION VECTOR CORRECTION BASED ON VERTICAL COMPONENT VALUES

摘要

There is provided a motion estimation and compensation device 10 that avoids discrepancies in chrominance components which could be introduced in the process of motion vector estimation. The device 10 has a motion vector estimator 11 for finding motion vectors in given interlace-scanning chrominance-subsampled video signals. The estimator 11 compares each candidate block B0 to B3 in a reference picture with a target block B in an original picture by using a sum of absolute differences (SAD) in luminance as similarity metric, chooses a best matching candidate block that minimizes the SAD, and determines its displacement relative to the target block. In this process, the estimator 11 gives the SAD of each candidate block B0 to B3 an offset determined from the vertical component of a corresponding motion vector, so as to avoid chrominance discrepancies. A motion compensator 12 then produces a predicted picture using such motion vectors and calculates prediction error by subtracting the predicted picture from the original picture.