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CS 450: Introduction to Digital Signal and Image Processing
Introduction and Applications
What are Signals?
l Signal: a function carrying information
l Examples: » Audio
» Radio/Television » Images
Why Signals?
l Communications
» Modems/Networks/Wireless » Audio
l Images
» Restoration/Cleanup » Enhancement
» Storage/Retrieval/Searching » Manipulation
Why Digital?
l Perfect storage, transmission, reproduction
l Easier to manipulate
» Analog signals manipulated by circuits » Digital signals manipulated by computer
Why Now?
l Memory is cheap
l Disk storage is plentiful l Bandwidth increasing
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