CS101.Lect18.Video.ppt

CS101.Lect18.Video.ppt - CS101 Lecture 18 Digital Video...

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1 1 Aaron Stevens 7 March 2011 CS101 Lecture 18 Digital Video Concepts 2 What You’ll Learn Today – Why do they call it a “motion picture”? – What is digital video? – How does digital video use compression? – How does YouTube send video over the internet?
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2 3 Who invented moving pictures? "I am experimenting upon an instrument which does for the eye what the phonograph does for the ear, which is the recording and reproduction of things in motion . ..." Thomas A. Edison 1888 4 Moving Pictures How do you make moving pictures out of still images? – Play enough images quickly enough to fool the mind into perceiving the images as continuous. – Analogous to sampling by taking many successive pictures.
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3 5 5 Example: Flip Book 6 Frame Rate The frame rate describes how many distinct images per second. Below which frame rate do humans see discrete picture versus animation? Show: frame rate examples – Television plays out at 30 frames/sec. – 35 mm movie cameras use a standard of 24 frames/second.
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4 7 TV Data Requirements Consider: – 480 * 360 pixels (standard TV resolution)
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CS101.Lect18.Video.ppt - CS101 Lecture 18 Digital Video...

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