MPEG$94575$ - translation to Αγγλικά
VIDEO ENCODING STANDARD
Mpeg7; Mpeg-47; MPEG-47; MPEG 7; Mpeg-7; MPEG7
MPEG
n. (inform.) file MPEG, file video o audio compresso al punto di perdere una piccola parte della sua qualità
Ορισμός
MPEG-1
<compression, standard, algorithm, file format> The first
MPEG format for compressed video, optimised for CD-ROM.
MPEG-1 was designed for the transmission rates of about 1.5
Mbps achievable with Video-CD and CD-i.
It uses discrete cosine transform (DCT) and Huffman coding
to remove spatially redundant data within a frame and
block-based motion compensated prediction (MCP) to remove
data which is temporally redundant between frames. Audio is
compressed using subband encoding. These algorithms allow
better than VHS quality video and almost CD quality audio to
be compressed onto and streamed off a single speed (1x)
CD-ROM drive.
MPEG encoding can introduce blockiness, colour bleed and
shimmering effects on video and lack of detail and
quantisation effects on audio.
The official name of MPEG-1 is International Standard
IS-11172.
(1999-01-06)
Βικιπαίδεια
MPEG-7
MPEG-7 is a multimedia content description standard. It was standardized in ISO/IEC 15938 (Multimedia content description interface). This description will be associated with the content itself, to allow fast and efficient searching for material that is of interest to the user. MPEG-7 is formally called Multimedia Content Description Interface. Thus, it is not a standard which deals with the actual encoding of moving pictures and audio, like MPEG-1, MPEG-2 and MPEG-4. It uses XML to store metadata, and can be attached to timecode in order to tag particular events, or synchronise lyrics to a song, for example.
It was designed to standardize:
- a set of Description Schemes ("DS") and Descriptors ("D")
- a language to specify these schemes, called the Description Definition Language ("DDL")
- a scheme for coding the description
The combination of MPEG-4 and MPEG-7 has been sometimes referred to as MPEG-47.
