| 摘要 |
<p>A hierarchical encoding system (10) and method efficiently compress image blocks (21) by using various successive hierarchical stages (11-19) and motion encoders (13, 15, 17) which employ cache memories (36) updated by stack replacement algorithms. A background detector (11) initially compares the present image block (21) with a previous image block and if the present image block (21) is substantially similar to the previous image block, the background detector (11) terminates the encoding procedure by setting a first flag bit (32). Otherwise, the image block (21) is decomposed into smaller subblocks (21') in a quadtree structure. The smaller subblocks (21') are compared with previous image subblocks of comparable size within the present image block (21).</p> |
