CS101.Lect17.Images.Intro.ppt

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

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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 .
Background image of page 2
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?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 7 Digital Information Example: Digital Thermometer This reading is discrete. Some detail is lost in converting to digital information.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/16/2011 for the course CS 101 taught by Professor Stevens during the Spring '08 term at BU.

Page1 / 15

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

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online