HEVC Field Unit
                     HEVC Field Unit
The HEVC Field Unit (HEVC FU) is a new 
form of organization for the HEVC 
Standard, which combines the advantages 
of the previous two unit types and 
eliminates their respective disadvantages. 
The coding block is not limited to macroblocks, 
but can freely expand in any direction, so that it 
can be adjusted flexibly according to the 
characteristics of the actual picture content.
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 This makes it possible to ensure 
that there are no discontinuous 
artifacts on the edge between 
adjacent coding blocks.
In addition, in order to ensure that the 
decoding process can still be 
completed quickly and flexibly, a set of 
skip modes have been added to control 
the search range of the candidate list.
In the HEVC standard, a field unit is the 
smallest unit of compressed video data. 
This is a reasonable definition, except that 
in video coding nobody refers to field units 
as units. Instead, they are called slices or 
tiles.
The problem is that the HEVC standard 
defines several types of slices and tiles: 
slice segments, dependent slices, 
independent slices and so on. 
The same goes for tiles. One type of tile can be 
split into sub-tiles; another cannot. One type of 
slice is stored in the bitstream without any 
markers whatsoever; another is stored with a 
marker at the beginning and end of each slice 
segment; and so on. 
So it would be very helpful to have a single 
word to refer to all these things together, 
which is what "field unit" is supposed to be. 
Unfortunately, nobody uses it this way.
In this paper, we propose a novel approach to 
achieve a scalable high efficiency video coding 
(SHVC) system based on the field unit. The 
proposed SHVC system considers two different 
ways of partitioning a frame into multiple 
subframes: temporal partitioning and spatial 
partitioning.