Verfahren und Schaltungsanordnung zur Unterabtastung bei Bewegungsschätzung

摘要

The scanning procedure involves the comparison of a reference block (R) within the image to be coded, with a block of the same size (S) in the previous image. A five-point fixed sampling procedure is used for the horizontal or zig-zag scanning of the pixels in the search area. Depending on the block position, pixels from alternate image lines are compared in the search and reference blocks. The circuit comprises a combination of sub-circuits for calculating the pixel deviation, a temporary memory for storing this deviation and an adding stage to accumulate the sum of the deviations.