CS101.Lect17.Images.Intro.ppt

# CS101.Lect17.Images.Intro.ppt - CS101 Lecture 17: Digital...

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1 1 Aaron Stevens 19 October 2010 With Thanks to John Magee and his dog Cody CS101 Lecture 17: Digital Images 2 What You ʼ ll Learn Today – What is digital information? – How to describe an image – What is color? – How do pictures get encoded into binary representation? – Why do images take so long to download from the web?

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2 3 A picture is worth… … a thousand words? Describe this image with enough detail to recreate it. How would a computer describe the image? 4 Analog and Digital Information Computers are fnite! How do we represent an infnite world? We represent enough oF the world to satisFy our computational needs and our senses oF sight and sound .
3 5 Analog and Digital Information We say that information can be represented in one of two ways: analog or digital . Analog A continuous representation, analogous to the actual information it represents. Digital A discrete representation, breaking the information up into Fnite elements. 6 Analog Information Example: Analog Thermometer The mercury (or alcohol) rises continuously in direct proportion to the temperature. What exactly is this reading?

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4 7 Digital Information Example: Digital Thermometer This reading is discrete. Some detail is lost in converting to digital information.
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## This note was uploaded on 12/16/2011 for the course CS 101 taught by Professor Stevens during the Spring '08 term at BU.

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CS101.Lect17.Images.Intro.ppt - CS101 Lecture 17: Digital...

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