Modelling Moving Objects in Multimedia Databases

Nabil, Mohammad; Ngu, Anne H. H.; Shepherd, John

doi:10.1142/9789812819536_0008

Cited by 13 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rather, such a speciÞcation, as well as the speciÞcation of any subsequent animation applied to such a region, must be programmed explicitly within an MCA. It follows that there is little direct correlation between spatial and temporal relations, and no formal notion of combined spatio-temporal relationships [13,21].…”

Section: Mcf Discussionmentioning

confidence: 99%

Modelling Reactive Multimedia: Design and Authoring

Thompson

King

Cameron

2005

Multimed Tools Appl

View full text Add to dashboard Cite

Multimedia document authoring is a multifaceted activity, and authoring tools tend to concentrate on a restricted set of the activities involved in the creation of a multimedia artifact. In particular, a distinction may be drawn between the design and the implementation of a multimedia artifact.This paper presents a comparison of three different authoring paradigms, based on the common case study of a simple interactive animation. We present details of its implementation using the three different authoring tools, MCF, Fran and SMIL 2.0, and we discuss the conclusions that may be drawn from our comparison of the three approaches.

show abstract

Section: Mcf Discussionmentioning

confidence: 99%

Modelling Reactive Multimedia: Design and Authoring

Thompson

King

Cameron

2005

Multimed Tools Appl

View full text Add to dashboard Cite

show abstract

“…An approach to represent shots by the time-varying directions of objects and the time-varying spatial relationships between objects is proposed by the systems in Li et al (1997), Nabil et al (1997 and Broilo et al (2010). For example, in Li et al (1997), a motion trajectory is considered as a set of points.…”

Section: Video Databasesmentioning

confidence: 99%

“…Also, at each point, the spatial relationships between objects are represented. However, these systems (Broilo et al 2010;Li et al 1997;Nabil et al 1997), only address an exact match algorithm for matching user queries with target shots.…”

Section: Video Databasesmentioning

confidence: 99%

cTraj: efficient indexing and searching of sequences containing multiple moving objects

Aghbari

2011

J Intell Inf Syst

View full text Add to dashboard Cite

Indexing sequences containing multiple moving objects by all features of these objects captured at every clock tick results in huge index structures due to the large number of extracted features in all sampled instances. Thus, the main problems with current systems that index sequences containing multiple moving objects are: huge storage requirements for index structures, slow search time and low accuracy due to lack of representation of the time-varying features of objects. In this paper, a technique called cTraj to address these problems is proposed. For each object in a sequence, cTraj captures the features at sampled instances. Then, it maps the object's features at each sampled instance from high-dimensional feature space into a point in low-dimensional distance space. The sequence of points of an object in lowdimensional space is considered the time-varying feature trajectory of the object. To reduce storage requirements of an index structure, the sequence of points in each trajectory is represented by a minimum bounding box (MBB). cTraj indexes a sequence by the MBBs of its objects using a spatial access method (SAM), such as an R−tree; thus, greatly reducing storage requirements of the index and speeding up the search time. The cTraj technique does not result in any false dismissal, but the result might contain a few false alarms, which are removed by a two-step refinement process. The experiments show that the proposed cTraj technique produces effective results comparable to those of a sequential method, however much more efficient.

show abstract

“…The second is moving object databases related to spatio-temporal databases. Other researchers are engaging in moving object databases that support the spatial objects with continuously changing position (Forlizzi et al, 2000) (Nabil et al, 1997). Forlizzi et al define a discrete data model that is described as a collection of data types and operations which can be plugged in as attribute types into any DBMS data model to obtain a complete model and query language.…”

Section: Related Workmentioning

confidence: 99%

Querying Video Data by Spatio-Temporal Relationships of Moving Object Traces

Yajima

Nakanishi

Tanaka

2002

Visual and Multimedia Information Management

View full text Add to dashboard Cite

We propose a query method that allows viewers to search video data based on the spatio-temporal relationships of moving objects using a simple and intuitive mode of input. In order to make a query, for example, of a certain segment or style of play in sports footage, it is necessary to express the complex movements of objects in an intuitive manner. In the proposed method, the user inputs this information as an object trajectory using a mouse or pen via a GUI. The usability of our proposed method is evaluated using a prototype query system with four main function; video query based on object speed, spatially absolute or relative query based on object movement, querying of movements of multiple moving objects specifying the spatio-temporal relationships among objects by expressing each object's trace on a timeline or multicanvas, and providing a non-linear viewing experience by allowing the user to control playback by drawing object traces directly on the video screen while watching the video.

show abstract

Modelling Moving Objects in Multimedia Databases

Cited by 13 publications

References 9 publications

Modelling Reactive Multimedia: Design and Authoring

Modelling Reactive Multimedia: Design and Authoring

cTraj: efficient indexing and searching of sequences containing multiple moving objects

Querying Video Data by Spatio-Temporal Relationships of Moving Object Traces

Contact Info

Product

Resources

About