Browse Prior Art Database

Automatc Adaptive Coding of Moving Pictures

IP.com Disclosure Number: IPCOM000105888D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Hong, J: AUTHOR [+2]

Abstract

Disclosed is a technique for coding moving pictures that generates adaptive coding information automatically by introducing flexible group structure into moving pictures. The technique is independent of the types of moving pictures and the purposes of coding.

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Automatc Adaptive Coding of Moving Pictures

      Disclosed is a technique for coding moving pictures that
generates adaptive coding information automatically by introducing
flexible group structure into moving pictures.  The technique is
independent of the types of moving pictures and the purposes of
coding.

      A set of successive frames that is a subset of an original
moving picture, and whose members resemble one another, is called a
"GOF" (Group of Frames) in this article.  The number of members is
not fixed; it can have an internal hierarchy, and it can be
classified as belonging to a certain level of an external hierarchy
according to its resemblance to the preceding GOF.  The first frame
of each GOF is called the "LEADER."

      A block diagram of the system is shown in Figure 1, and Figure
2 shows an example of how GOFs are generated.  The frames pass
through the system successively in the original order.  A resemblance
estimator, often used as a scene-change detector, measures the
physical change between the current frame and its preceding frame,
which is held in the frame memory.  The comparator decides which GOF
the current frame belongs to, using this change and some preset
threshold values.  If the change exceeds a threshold value, the
current frame becomes the LEADER of a new GOF of a certain level and
of a certain class; if the change does not exceed any threshold
values, the current frame and its preceding frame belong to the same
GOF...