Information Technology Reference
In-Depth Information
ඨ↹⚛♖ᐲ
MC
䋨ᣇะ੍᷹䈅䉍䋩
MPEG-2
(1994)
ඨ↹⚛♖ᐲ
MC
䋨ᣇะ੍᷹䈅䉍䋩
MPEG-2
(1994)
ඨ↹⚛♖ᐲ
MC
䋨ᣇะ੍᷹䈭䈚䋩
MPEG-2
(1994)
ඨ↹⚛♖ᐲ
MC
䋨ᣇะ੍᷹䈭䈚䋩
MPEG-2
(1994)
นᄌ䊑䊨䉾䉪
䉰䉟䉵
MC
䈭䈬
AVC
(2003)
นᄌ䊑䊨䉾䉪
䉰䉟䉵
MC
䈭䈬
AVC
(2003)
Variable
Block-size
MC
(AVC 2003)
Half-pel MC
Bi-predictive
(MPEG-2 1994)
Half-pel MC
No Bi-predictive
(MPEG-2 1994)
“Mobile & Calendar”
“Mobile & Calendar”
(MPEG)
㪋㪌
㪋㪌
㪠㫅㫋㫉㪸
㪧㫉㪼㪻㩿㫀㫅㫋㪼㪾㪼㫉㪀
㪧㫉㪼㪻㩿㪿㪸㫃㪽㪀
㪙㪄㪧㫉㪼㪻
㪘㪭㪚
㪠㫅㫋㫉㪸
㪧㫉㪼㪻㩿㫀㫅㫋㪼㪾㪼㫉㪀
㪧㫉㪼㪻㩿㪿㪸㫃㪽㪀
㪙㪄㪧㫉㪼㪻
㪘㪭㪚
㪋㪇
㪋㪇
㪊㪌
㪊㪌
㪊㪇
㪊㪇
ᢛᢙ↹⚛♖ᐲ
MC
䋨ᣇะ੍᷹䈭䈚䋩
H.261
(1990)
ᢛᢙ↹⚛♖ᐲ
MC
䋨ᣇะ੍᷹䈭䈚䋩
H.261
(1990)
Integer MC
No Bi-predictive
(H.261 1990)
Inter frame DCT
(DCT 1974)
(MJPEG 1992)
䊐䊧䊷䊛ౝ
DCT
DCT (1974)
JPEG (1992)
䊐䊧䊷䊛ౝ
DCT
DCT (1974)
JPEG (1992)
㪉㪌
㪉㪌
㪉㪇
㪉㪇
㪇
㪇
㪌
㪌
㪈㪇
㪈㪇
㪈㪌
㪈㪌
㪉㪇
㪉㪇
㪉㪌
㪉㪌
㪊㪇
㪊㪇
Bitrate (Mbit/s)
Bitrate (Mbit/s)
Fig. 42
Improvement of coding performance
On the other hand, the operation load in terms of complexity of video coding
continues to increase with the standard evolution of MPEG. By improving Intra
and Inter prediction accuracy, the complexity of AVC/H.264 encoding process has
increased by 5 to 10 times compared with that of MPEG-2 or MPEG-4 visual. The
complexity of the decoding process of AVC/H.264 is double for that of MPEG-4
visual by adopting context adaptive entropy coding and in-loop deblocking filter.
However, the progress of semiconductor technology including LSI, processor and
large scale storage has supported the realization of evolution of video compression
technology.
4 Requirement for Quality of UHD Video System
4.1 Required Specifications for UHD Video Service
HDTV was realized by MPEG-2 as a digital broadcasting service for the home,
and HDTV broadcasting has promoted both the thinness and enlargement of tele-
vision displays. Camcorders and video recorders also support HDTV. Since the
visible difference of video quality between SDTV and HDTV on a large screen
became clear for users, the merits of HDTV have been validated. When UHD
video, which is expected as the next generation video service, will be realized, it is
necessary to improve each parameter, which influences video quality including
spatial and temporal resolutions, gradation, and color space of HDTV. An illustra-
tion that re-examines the various factors to be qualified into UHD Video is shown
in Fig. 43.
