1. A method of line buffer reduction for context adaptive entropy decoding, the method comprising: determining context for parsing a syntax element of a current block in a region depending on block information associated with one or more neighboring blocks, wherein the region corresponds to one or more rows of largest coding units (LCUs); if a first neighboring block is on an upper side of a horizontal region boundary or on a left side of a vertical region boundary of the region, replacing the block information associated with the first neighboring block by replacement block information; and performing context adaptive entropy decoding of the syntax element based on the context.