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Video & Scanning Overview
IT 130Web Graphics and Multimedia
Video Overview Video can be costly and time-
consuming to create
Video files can become extremely large
Many ready-made video clips available
Video Overview Video (like audio) requires analog
signal to be digitized
Video Overview Analog video (videotape) is linear –
it has a start, middle, and end
Digitized video allows random access
DVD is a good example
Video Overview Video file size
Frame rate (TV – 30 frames/second)
Image size
Color depth
Frames/second x image size x color depth / 8 = estimated file size of 1 second of video
Video Compression Two types of compression
Lossless – preserves the exact image (large file)
Lossy – eliminates data
Standards established for compression MPEG (Motion Pictures Experts Group) 20:1 compression ratio (1MB to 50KB)
Video Compression Compression software programs
Apple’s QuickTime (.MOV) Lossy compression with 5:1 to 25:1 ratios
Windows Media Player (.AVI) Uses Audio Video Interleave (AVI)
Format Examples
Video Compression Incorporating transitions Superimposing titles and animations Applying special effects Synchronizing sound with the video Applying filters for blurring,
morphing, etc.
Video on the Web Can be a drawback instead of an
asset
Animation or still images should be explored as an option
Quality vs. cost
Video on the Web Video transfer types
HTTP (HyperText Transfer Protocol) Small video clips
RTSP (Real-Time Streaming Protocol) Continuous-playing technology Large video files and live broadcasts
Video on the Web Streaming video very popular
Reduce start time significantly
Players RealPlayer Windows Media Player QuickTime Player
File formats (AVI and MPEG)
Video on the Web Digital Video Professionals
Association www.dvpa.com
Scanners Buyer’s guide
www.zdnet.com/special/filters/sc/scanner
TWAIN www.twain.org
TWAINQuestion: What is TWAIN an acronym for?
Answer: An image capture API for Microsoft Windows and Apple Macintosh operating systems. The standard was first released in 1992, and is currently ratified at version 1.9 as of January 2000. TWAIN is typically used as an interface between image processing software and a scanner or digital camera.
The word TWAIN is from Kipling's "The Ballad of East and West" - "...and never the twain shall meet...", reflecting the difficulty, at the time, of connecting scanners and personal computers. It was up-cased to TWAIN to make it more distinctive. This led people to believe it was an acronym, and then to a contest to come up with an expansion. None were selected, but the entry "Technology Without An Interesting Name" continues to haunt the standard. "
Scanning Demo HP ScanJet Scanner 5370C Series
$230
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