Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 24: Problem 14

How are multimedia sources indexed for content-based retrieval?

Short Answer

Expert verified
Content-based retrieval in multimedia sources involves extracting distinctive features of the multimedia data and indexing. The indexed features are then used for comparing with and retrieving the relevant multimedia data upon queries, allowing for efficient and accurate data retrieval.

Step by step solution

01

Define Content-Based Retrieval

Content-based retrieval is a method for retrieving specific types of contents based on its actual content rather than its metadata (like file name or date). It is often used in multimedia databases to retrieve images, videos, audios and other multimedia data.
02

Explain Indexing

Indexing in multimedia databases is a way to optimize the speed of data retrieval. When a database is indexed, it creates a 'directory' that can be used to quickly locate data without having to search every row in the database table.
03

Content-Based Retrieval in Multimedia Sources

In content-based retrieval of multimedia sources, different features of the multimedia data (like color, texture, shape for images, or pitch, tempo for sound clips) are extracted and indexed. When a query is made, these indexes are used to compare features and retrieve the relevant multimedia data. Various techniques can be used for indexing: Vector Space Model, Histogram, Feature Extraction etc.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Describe how the insert, delete, and update commands should be implemented on a transaction time relation.

What are the differences among immediate, deferred, and detached execution of active rule actions?

What are the main differences between tuple versioning and attribute versioning?

Discuss some applications of active databases.

Consider the following rules: reachab \(\operatorname{le}(X, Y):-f 7 i g h t(X, Y)\) reachable \((X, Y):-\text { flight }(X, Z), \text { reachab }\rceil e(Z, Y)\) where reachable \((X, Y)\) means that city \(Y\) can be reached from city \(X,\) and f7ight \((\mathrm{X}, \mathrm{Y})\) means that there is a flight to city \(Y\) from city \(\mathrm{X}\) a. Construct fact predicates that describe the following: i. Los Angeles, New York, Chicago, Atlanta, Frankfurt, Paris, Singapore, Sydney are cities. ii. The following flights exist: LA to NY, NY to Atlanta, Atlanta to Frankfurt, Frankfurt to Atlanta, Frankfurt to Singapore, and Singapore to Sydney. (Note: No flight in reverse direction can be automatically assumed.) b. Is the given data cyclic? If so, in what sense? c. Construct a model theoretic interpretation (that is, an interpretation similar to the one shown in Figure 25.3 ) of the above facts and rules. d. Consider the query reachable(AtTanta, Sydney)? How will this query be executed using naive and seminaive evaluation? List the series of steps it will go through. e. Consider the following rule-defined predicates: round-trip-reachable \((X, Y):-\) reachab 7 e \((X, Y),\) reachab 7 e \((Y, X)\) duration \((x, Y, z)\) Draw a predicate dependency graph for the above predicates. (Note: dura\(\operatorname{tion}(X, Y, Z)\) means that you can take a flight from \(X\) to \(Y\) in \(Z\) hours. f. Consider the following query: What cities are reachable in 12 hours from Atlanta? Show how to express it in Datalog. Assume built-in predicates like greater-than \((X, Y) .\) Can this be converted into a relational algebra statement in a straightforward way? Why or why not? g. Consider the predicate population(X,Y) where \(Y\) is the population of city X. Consider the following query: List all possible bindings of the predicate pair \((\mathrm{X}, \mathrm{Y}),\) where \(\mathrm{Y}\) is a city that can be reached in two flights from city \(\mathrm{x}\) which has over 1 million people. Show this query in Datalog. Draw a corre. sponding query tree in relational algebraic terms.
See all solutions

Recommended explanations on Computer Science Textbooks

Game Design in Computer Science

Read Explanation

Databases

Read Explanation

Computer Systems

Read Explanation

Big Data

Read Explanation

Issues in Computer Science

Read Explanation

Theory of Computation

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free