Video & Scanning Overview IT 130 Web 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.morphing

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

Scanners Buyer’s guide TWAIN

TWAIN Question: 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 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