A great deal of information is now being created, stored, and distributed in digital form. Newspapers, and magazines, for example, have gone online to provide real-time coverage of stories with high-quality audio, images, and even video sequences. Th

The amount of audio visual information available in digital format has grown exponently in recent years. Gigabytes of new images, audio and video clips are generated and stored every day, building up a huge, distributed, and mostly unstructured repos