Summary Multimedia Database

INTRODUCTION 1) Background a) Combine text + graphics b) opthalmic + audio c) Catalog and index image + efficient retentiveness and voice communication 2) 4 Difficulties d) Data suit e) Data manipulation f) Data storage g) Data delivery 3) Importance h) Store Image (egmuseum) i) Search and wangle content 4) Types j) Images k) Audio l) Video m) Document n) Handwritten 5) Application o) GIS,CAD,Face-retrieval,doc imaging, medical exam db, web 6) Characteristic p) Treat mdb same way as information based 7) 4 Challenges q) Size r) Time s) Semantic character of multimedia system ) Operation of individual media 8) 5 Features u) Support diff. multimedia data type v) Handle large no. multimedia obj. w) Hierarchical storage social structure & archiving data x) Information-retrieval y) Database capabilitiesMore Summary of Devil at My HeelsMULTIMEDIA selective information1. Multimedia data size Size of media data makes storage, processing, transmission and reception of the data very costly a. Multimedia data acquisition * Data capture video/audio/video * Sampling convert analog to digital * 8bits = 256 colourize * 24bits = 16 million colors b.Dealing with Media Object Size * 2 approaches bloodline references/reduce size media * SQL1999 2 data type tell apart & CLOB inadequacy in (PK, FK ,equality test) * Oracle9i support 2 LOB internal LOB BLOB & CLOB external LOB BFILE * IBM DB2 BLOB,CLOB,DBLOB(china) c. Reducing Media Objects Size * crunch algorithm *remove duplicate information *abbreviating information * Objective * bring down bandwidth/storage *Decode signal close to original *Robustness,scalability,extensibility * 2 stages *Predict-estimate plain & select algorithm Transform-Compress & Decompress * 2 form of compression *Lossless-lose none,21,31 *Lossy-lose some,101,801 * Two ways *Run-length encoding *Huffman coding * 2. Real-Time genius of Multimedia Data d. Segmentation subdividing video obj e. Manual segmentation costly so focus on automatic segmentation 3. Semantic Nature of Multimedia Data f. Semantic metadata describe multimedia obj. g. Refer as text desc/characteristic of metadata(texture of image,frequencies of audios,font size for text)Database Management System and Data