T-111.5550 Seminar on Multimedia

Metadata Management

Hannu Järvinen Hannu.Jarvinen@tml.hut.fi

Contents

1. Metadata in multimedia 2. Multimedia Domains 3. Storing metadata 4. Metadata Lifecycle 5. Use cases 6. MPEG-7 7. Downsides 8. Metadata versus content interpretation 9. Future

Metadata on multimedia

Metadata is data about data Data about multimedia content ID3 tags in MP3 files Amount of multimedia available is rising up Semantic Web, Web 2.0

Storing metadata

Internal, in a same file External, a separate file XML, binary, Exif..

Metadata Lifecycle

Use cases

Creating a content description manually Creating a content description

automatically Modifying existing metadata Searching content using metadata

Creating a content description manually - Flickr Adding pictures to

Flickr service Browse files Add tags for all

images

Creating a content description manually - Flickr Add descriptions

for each picture Modify tags Save and you

are ready

Creating a content decription automatically - Exif Take a photograph with a digital camera Connect the camera to your PC and copy

the pictures Check the picture properties for data and

time, exposure time, location, etc.. Exif - Exchangeable image file format

Modifying existing metadata - IMDb Give your vote to rate a movie at IMDb

Searching content using metadata - Youtube Finding video content about a known sight

using Youtube

MPEG-7

Multimedia Content Description Interface Not like MPEG-1, MPEG-2, MPEG-4 Aims to provide interoperability Offers system level functions for

operations to metadata Defines over 450 metadata types Possibility to create more

MPEG-7 cont.

Most promising May be merged into one with other

standards (TV-Anytime), but basis on MPEG-7

Suitable for wide use Critics about having too much freedom on

structures and that it focuses on too wide area

Downsides

Too expensive Hard to deside what to include Data size grows up Metadata is useless

Metadata versus content interpretation

Metadata is not necessary Textual search engines, Google Content based image browsers Humming People want to use textual input for

searching

Future

Metadata becomes more important Semantic Web Data will become smart

Any questions?