| 摘要 |
An apparatus encodes a binary shape signal by using an adaptive context-based arithmetic encoding technique. To this purpose, the apparatus includes a first encoding block for encoding the binary shape signal by using a first context-based arithmetic encoding technique for processing the binary shape signal on a pixel-by-pixel basis to thereby generate first encoded data, a second encoding block for encoding the binary shape signal by using a second context-based arithmetic encoding technique for processing the binary shape signal on a subblock-by-subblock basis to thereby produce second encoded data, wherein the binary shape signal is partitioned into a multiplicity of subblocks and the number of pixels in each subblock is smaller than the number of pixels in the binary shape signal and larger than 1, a bit calculation block for ciphering the numbers of bits of the first and the second encoded data and comparing the calculated numbers with each other, and a selection block for choosing either the first or the second encoded data whose bit number is smaller than that of the other based on the comparison result and providing the selected data as the encoded binary shape signal. |
