Deliver High Quality High Performance HEVC via Intel® Media Server Studio

Sample Adaptive Offset (SAO)
Applied to reconstructed video
SAO Types
Deliver High Quality, High Performance HEVC via Intel® Media Server Studio
Details of how SAO Types work
o 3 pel patterns for pixel
classification in Edge
Offset
o Pixel Classification Rules
for Edge Offset
o Grouping 4 bands and
Representation
HEVC Encoder
Figure 3E Sample Adaptive Offset Types, Edge Classification,
and Grouping of Bands
Fig. 4 shows high level block diagram of HEVC Encoder. Input video frames are partitioned recursively from
CTB’s to CUs and then nonrecursively into PUs. The prediction partition PUs are then combined to generate
Prediction CUs that are differenced from the original resulting in residual CU’s that are recursively QT split
into TUs and coded with variable Block Size (VBS) transform of 4x4 (DST or DCT approx), or 8x8, 16x16, and
32x32 (DCT approx only). CU/PU Partitioner partitions into CU/PU, and the TU partitioner partitions into
TUs. An Encode Controller controls the degree of partitioning performed which depends on quantizer used
in transform coding. The CU/PU Assembler and TU Assembler perform the reverse function of partitioner.
The decoded (every DPCM encoder incorporates a decoder loop) intra/motion compensated difference
partitions are assembled following inverse DST/DCT to which prediction PUs are added and reconstructed
signal then Deblock, and SAO Filtered that corespondingly reduce appearance of artifacts and restore
edges impacted by coding.
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Figure 4 HEVC Encoder