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Unformatted text preview: 0 seconds in a 90 min video 5400 x 30Mb = 162000 Mb = 162Gb
DVD capacity 4.7Gb. Blue Ray 50 Gb
Special temporal compression techniques used for Video Summary
Summary Higher Resolution (pixels/inch) gives better quality, but space increases quadratically.
Bit depth (color depth) measured in bits/pixel. “Truecolor” = 24 bits, 8 for each of R, G, B.
Space = num_pixels x bits/pixel
Compression techniques: runlength, .gif, .jpg.
Vectorbased representations have adv, disadv. Video is big; compression is both spatial and temporal
See http://jmerritt.warpax.com/graphics_for_beginners/index.html for a good survey. Representing Sounds
Representing Sounds Goals
Goals Understand how sound is represented digitally Understand sampling rate, quantization and tradeoff between quality and file size Know typical factors used in sound compression Sound Representation
Sound is a (continuous) wave http://www.cs.wfu.edu/~burg/CCLI/Templates/flash.php?file=Chapter...
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- Fall '09
- Computer Science