NEIGHBOR TILE BUFFERING FOR DEBLOCK FILTERING ACROSS TILE BOUNDARIES

摘要

Deblock filtering at the tile boundaries of a tiled picture use a tile neighbor buffer in addition to top neighbor buffer left neighbor buffers. The tile neighbor buffer buffers pixel data from the bottom right corner of the left-diagonal tile. When the top rows of pixels of a tile are being filtered, the top neighbor buffer stores the bottom rows of pixels of the tile above. As the tiles are processed in raster order, some of the pixels in the top neighbor buffer are the pixels in the bottom right corner of the left-diagonal tile of the next tile to be filtered. The portion of the top neighbor buffer storing pixel data representing this bottom right corner is copied directly from the top neighbor buffer to the tile neighbor buffer for further filtering when processing the next tile.

主权项

1. A method for deblock filtering of a picture at a video processing system to generate a deblocked picture, the method comprising:
identifying an array of tiles in the picture; and for each tile not adjacent to a top border or a left border of the picture:
transferring a subset of first pixel data from a first buffer to a second buffer, the first pixel data representing a set of one or more bottom rows of pixels of a left-diagonal tile and the subset of pixel data representing pixel data for pixels at a bottom right corner of the left-diagonal tile;after transferring the subset of the first pixel data, buffering second pixel data representing a set of one or more bottom rows of pixels of a left-adjacent tile in the first buffer, the second pixel data overwriting the first pixel data;buffering third pixel data representing a set of one or more bottom rows of pixels of a top-adjacent tile in another part of the first buffer;buffering fourth pixel data representing one or more columns of pixels from a left-adjacent tile in a third buffer; anddeblock filtering at boundaries of the tile using pixel data in the first, second, and third buffers.