Summary Multimedia Database

design 1) Background a) Combine text + graphics b) Visual + audio c) Catalog and index image + high-octane terminus and delivery 2) 4 Difficulties d) selective information type e) entropy manipulation f) Data storage g) Data delivery 3) Importance h) Store Image (egmuseum) i) Search and manipulate content 4) Types j) Images k) Audio l) Video m) register n) Handwritten 5) Application o) GIS,CAD,Face-retrieval,doc imaging, medical db, web 6) Characteristic p) Treat mdb same way as entropy based 7) 4 Challenges q) Size r) Time s) Semantic Nature of multimedia ) Operation of individual media 8) 5 Features u) Support diff. multimedia info type v) Handle large no. multimedia obj. w) Hierarchical storage structure & archiving data x) Information-retrieval y) Database capabilitiesMore Summary of Devil at My HeelsMULTIMEDIA DATA1. Multimedia data size Size of media data makes storage, processing, transmission and reception of the data very costly a. Multimedia data acquisition * Data capture photo/audio/video * Sampling convert analog to digital * 8bits = 256 colors * 24bits = 16 million colors b.Dealing with Media Object Size * 2 approaches store references/reduce size media * SQL1999 2 data type distinguish & CLOB Lack 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 * Compression algorithm *remove facsimile information *abbreviating information * Objective *Reduce bandwidth/storage *Decode signal close to original *Robustness,scalability,extensibility * 2 stages *Predict-estimate redundant & select algorithm Transform-Compress & Decompress * 2 form of compression *Lossless-lose none,21,31 *Lossy-lose some,101,801 * ii ways *Run-length encoding *Huffman coding * 2. Real-Time Nature of Multimedia Data d. Segmentation subdividing video obj e. manual(a) segmentation costly so focus on automatic segmentation 3. Semantic Nature of Multimedia Data f. S emantic metadata describe multimedia obj. g. Refer as text desc/characteristic of metadata(texture of image,frequencies of audios,font size for text)Database precaution System and Data