Method and apparatus for binary shape encoding

Details Method and apparatus for binary shape encoding Method and apparatus for binary shape encoding

1997-08-25

2000-10-03

Lee, Michael H.

Television

Bandwidth reduction system

Data rate reduction

348397, 348420, 348627, 348608, 382236, H04N 746

Patent

active

061280410

ABSTRACT:
A binary shape encoding apparatus encodes a binary alpha block (BAB) consisting of M.times.N binary pixels, M and N each being a positive even integer. The apparatus samples every other horizontal lines of the BAB to generate a first block starting from either a first or a second horizontal line of the BAB and then samples every other vertical lines of the first block to generate a first sample block as a base layer also starting from either a first or a second vertical line of the first block, wherein the first horizontal and vertical lines are the topmost horizontal and the leftmost vertical lines in the BAB and the first block, respectively. Then, the apparatus encodes the first sample block to thereby produce coded base layer data and performs enhancement layer encoding based on the BAB, the first block and the first sample block to thereby provide coded horizontal and vertical enhancement layer data.

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