Comparative Study of Near-Lossless Compression by JPEG XR, JPEG 2000, and H.264 on 4K Video Sequences - Advances in Image and Graphics Technologies - page 34

Fig. 7. Rate-distortion perfo
component

ormance using PSNR and SSIM for parameter OF on UV

As shown above, at the con
following conclusions can b

ndition of TileSize=128x128, 512x512 and Trimflexbit=
be deduced:

= 0,

─ For both Y and UV co
0.5~1.5dB
─ For Y component, there
─ For UV components, OF
0.2dB
The SSIM [6] result is simil

omponents, OF=1 outperforms OF=0 with PSNR gain n of

is no obvious difference between OF=2 and OF=1
F=2 outperform OF=1 with an average maximum gain n of

lar with the PSNR result.

• TrimFlexBits

TrimFlexBits=[0,15], it me
all FlexBits is preserved and
The rate-distortion result in
Fig. 8.

ans lower N bits will be truncated. If TrimFlexBits=0, t
d if TrimFlexBits=15, all FlexBits is truncated.
n terms of PSNR on both Y and U component is shown

then

n in

As shown above, at the co
the result shows that:

ondition of TileSize=512x512 and Overlapfilter= 0 and d 1,

─ At high compression ra
option is very small
─ At low compression r
tendency seems different

atio (below 0.05), the difference between the Trimflex xbit

ratio(over 0.1), the difference become larger, but
t in Y and U(V)

the

• Overall performance