CS315 Multimedia Search and Retrieval. Types of Multimedia Multimedia: Beyond text communication Stored in a variety of formats Audio Today most popular.

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CS315 Multimedia Search and Retrieval

Types of Multimedia Multimedia: Beyond text communication Stored in a variety of formats Audio Today most popular formats: Image Today most popular formats: Animation Today most popular formats: Video Today’s most popular formats:

Searching for Audio Tagged audio files News organizations (e.g., NPR, BBC, …) iTunes etc services Raw audio Signal processing To Speech recognition processing To Text (inaccurate) Perform text search Tune recognition Signal processing Pattern matching E.g., midomi.com, shazam.com/

Searching for Video Tagged by humans News organizations YouTube.com TED.com MIT’s Lecture Browser Lectures have additional challenges Glass at MIT Spoken Lecture Processing Project -browser -browser Extract audio track Convert into text Analyze text to reveal structure Segment based on structure

Searching for Images Use surrounding text Filenames, html, nearby text Computer Vision techniques Still a tough problem Tagged by humans Great results, but… Expensive! Slow! Idea: Exchange adrenaline for human labor! The ESP game (now part of gwap.com) [von Ahn, Dabbish: Labelling Images with a Computer Game] The Peekaboom game (newer version called squigl) [von Ahn, Liu, Blum: A game for locating objects in images]

If humans are still the best taggers… Captcha: program that can tell whether its user is a human or a computer Can generate and grade test that Most humans can pass Current computer programs will fail New: ReCAPTCHA