LASeR (Lightweight application scene representation ) is the MPEG RichMedia standard dedicated to the mobile, embedded and consumer electronics industries. LASeR provides a fluid user experience of enriched content, including Audio, Video, Text, and Graphics on constrained networks and devices.
LASeR standard is specified in the MPEG-4 Part 20.
The LASeR standard specifies the coded representation of multimedia presentations for rich media services. In the LASeR specification, a multimedia presentation is a collection of a scene description and media (zero, one or more). A media is an individual audiovisual content of the following type: image (still picture), video (moving pictures), audio and by extension, font data. A scene description is composed of text, graphics, animation, interactivity and spatial and temporal layout.
A LASeR scene description specifies four aspects of a presentation:
- how the scene elements (media or graphics) are organized spatially, e.g. the spatial layout of the visual elements;
- how the scene elements (media or graphics) are organized temporally, i.e. if and how they are synchronized, when they start or end;
- how to interact with the elements in the scene (media or graphics), e.g. when a user clicks on an image;
- and if the scene is changing, how these changes happen.
LASeR handles access units, i.e. self-contained chauncks of data, which may be adapted for transmission over a variety of protocols. LASeR streams may be packaged with some or all of their related media into files of the ISO base media file format family (e.g. MP4) and delivered over reliable protocols.
LASeR :
- Brings smart and pleasurable navigation within streamed and real-time AV contents,
- Is compliant with existing business models, and
- Allows an increased ARPU(Average Revenue Per Unit) by boosting service subscription thanks to interactivity.
Mattia Donna Bianco
