영어를 해석 부탁드립니다.


5.5 MPEG-7

Lots of audio-visual information is available on the web, but there are not adequate search tools to locate this information. The aim of MPEG-7 [ MPEG7] is to specify a set of descriptors to describe various forms of multimedia. It will also standardize ways to define other descriptors as well as structures for the descriptors and their relationship. This information will be associated with the content to allow fast and efficient search. MPEG-7 will also standardize a language to specify description schemes.

MPEG standardization efforts and approval dates are given in Table 2
MPEG-1 November 1992
MPEG-2 November 1994
MPEG-4 version 1 October 1998
MPEG-4 version 2 December 1999
MPEG-7 July 2001


Table 2: MPEG approval dates

Back to Table of Contents



--------------------------------------------------------------------------------
7. Fractal-Based coding

Fractal coding [ Torress96] is a new and promising technique . In an image values of pixels that are close are correlated. Transform coding takes advantage of this observation. Fractal compression takes advantage of the observation that some image features like straight edges and constant regions are invariant when rescaled. Representing straight edges and constant regions efficiently using fractal coding is important because transform coders cannot take advantage of these types of spatial structures. Fractal coding tries to reconstruct the image by representing the regions as geometrically transformed versions of other regions in the same image. There is not much material on fractal-based video coding. Most of the research currenty focuses on fractal based image coding.

Back to Table of Contents