摘要
本文提出一种多媒体数据表达模型：演员模型，该模型建立在多媒体数据库概念模型基础之上，基于库所—时间Ｐｅｔｒｉ网，描述多媒体对象之间的时态关系，同时引入与变迁相关联的场景表达式，描述多媒体对象之间的空间关系，从而模拟多媒体数据的时空编组，文中形式化地定义了演员模型的抽象模型和实现模型，提出多媒体对象的表达算法以及多媒体数据库的查询模型．
This paper presents a multimedia data presentation model-actor model,which is built over the conceptual model of multimedia database.This model applies place -duration Petri net to describe the temporal relationships among multimedia objects,and introduces the stage expressions associated with transitions to describe the spatial relationships among multimedia objects,so as to model the spatio-temporal composition of multimedia data.The formal abstraction model and implementation model are defined.The presentation algorithm of multimedia object is presented. The query model of multimedia database is proposed.
出处
《软件学报》
EI
CSCD
北大核心
1996年第8期471-480,共10页
Journal of Software
关键词
多媒体
数据库
数据模型
数据表达模型
Multimedia database
data model
presentation model
spatio-temporal composition
Petri net.
