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In-Depth Information
Fig. 7.7 Decisions for each
four-sample segment of block
boundary. PU prediction unit,
TU transform unit [ 37 ]
Boundary is
aligned with 8x8
sample grid?
No
Boundary is
between PU
or TU?
No
Boundary
strength
Bs > 0?
No
Condition (7.1) true?
No
Conditions
(7.2), (7.3), (7.4)
true?
No filtering
Yes
No
Strong filtering
Normal filtering
crossing the block boundary. Since condition in ( 7.1 ) is evaluated true for the signal
that forms a perfect ramp passing across the block boundary (such as a gradual
change in the luma component), the deblocking in the normal filtering mode is
designed to not modify the ramp. The filtered sample values p 0 0 and q 0 0 (the row
index j is omitted for brevity) are determined by adding or subtracting an offset
value 4 0 to each of the sample values:
p 0 0 D p 0 C 0 ;
(7.7)
q 0 0 D q 0 0 ;
(7.8)
wherethevalueof 4 0 is obtained as in
0 D Clip3.-t C ;t C ;•/;
(7.9)
 
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