| 摘要 |
An image is divided into blocks and local motion vectors are derived for each block indicating the possible motions of the block between frames. Global motion vectors are derived by selecting the most frequently occurring local vectors over the whole image (103, fig 13). Association means 104 determine that a given global motion vector is "associated" with a given block by comparing 181 it with the local motion vectors. A global motion vector is associated with a block if it lies within a predetermined threshold 185 of the local motion vectors for that block. Assignment of motion vectors in a block (105, fig 13) is then made on a pixel by pixel basis from: the local motion vectors for that block, the local motion vectors for neighbouring blocks, and those global vectors (if any) associated with that block. <IMAGE> |
