Multimedia Database Management System

INTRODUCTION: A multimedia database management system is a framework that manages different types of data potentially represented in a wide diversity of formats on a wide array of media sources.

SYSTEM DESCRIPTION: The multimedia DBMS provides support for multimedia data types and facilities for the creation, storages, access, query and control of the multimedia database.

FEATURE:

1. Since multimedia objects are typically huge, we need different techniques for their storage and retrieval. Multimedia objects can be stored in different systems and users might access stored data over computer networks. This leads to a distributed view of multimedia databases.

2. Users can query multimedia databases in different ways, depending on the type of information they need. These queries provide a filtered view of the multimedia databases to the users by retrieving only the required objects.

3. The objects retrieved from the databases have to be appropriately presented, providing the user’s view of the multimedia database. Here some components describes in details:

4. Text Data a) Text data is often represented as strings.However, text as used in multimedia document systems includes structural information such as title, author etc. b) Hence one needs a language environment to reflect the structural composition of the text data. c) Another environment named the Hypermedia/Time-based structuring language has also been defined to include support for hypermedia documents with links and support for inclusion of multimedia object in a text documents specification.

5. Audio Data a) Audio data has an inherent time dependency associated with it.The time scale associated with audio object has to be uniform for a meaningful interpretation. b) Audio has to be digitized before it can be processed. Size of digitized audio depends on the technique used, which in turns depends on the desired audio quality. c) For instance, a normal voice quality digitization is done at 8khz with 8bits per sample and hence it produces 64kb/s of data.

6. Image Data a) Image data represent digitized drawing, painting, or photographs.The size of a digitized image depends on the required quality. b) Color image and photograph requires more storage space.Typically a color image or a photograph needs the RGB components of each pixel to be stored. c) Different compression algorithms as well as storage representations can be employed and this results in different formats of digitized images and photographs. d) Joint Photographers Encoding Group (JPEG) is one such format for images, which has been standardized by ISO. e) Other popular formats include Graphic Interchange Format (GIF) and Tag Image Format (TIFF).

7. Video Data a) Video data represents the time dependent sequencing of digitized pictures or images called video frames. b) The number of video frames for one second depends on the standard that is employed. c) NTSC (National Television System Committee) standard employs 30 frames/second while PAL (Phase Alternation Line) employs 25 frames/second. d) Further, the pixel size of a frame depends on the desired quality. Normal NTSC frames are 512 * 480 pixels in size, HDTV (High Definition Television) frames employ 1024 * 1024 pixels. e) The number of bits needed per pixel reflects the quality of digitized video frame.
   Digitized video requires large storage space. Compression schemes need to be employed to reduce the volume of data to be stored.
   f) Motion Picture Encoding Group (MPEG) is a standard that has been specified by the ISO for compression and storage of video. The standard MPEG 2 specifies the methodology for storing audio along with compressed video.

CHALLENGES: When we can understand our project clearly then we will be able to take any kind of challenges.

CONCLUSION: From this we can conclude that the database management for multimedia is required and it can be managed like normal data that will very helpful in the current era of multimedia application. Number of multimedia database system already exists with some limitation but we can expect new system with better capabilities in the near future. Future trend include performing indexing , retrieval and browsing directly on the compressed data , especially for video data; video data management; multimedia query language ; uniform indexing frame work for the different data types; content base image and video retrieval; and multimedia transport and deliver overt the
internet.