1 / 15

Video & Scanning Overview

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.

mikko
Download Presentation

Video & Scanning Overview

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Video & Scanning Overview IT 130 Web Graphics and Multimedia

  2. Video Overview • Video can be costly and time-consuming to create • Video files can become extremely large • Many ready-made video clips available

  3. Video Overview • Video (like audio) requires analog signal to be digitized

  4. Video Overview • Analog video (videotape) is linear – it has a start, middle, and end • Digitized video allows random access • DVD is a good example

  5. 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

  6. 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)

  7. 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

  8. Video Compression • Incorporating transitions • Superimposing titles and animations • Applying special effects • Synchronizing sound with the video • Applying filters for blurring, morphing, etc.

  9. 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

  10. 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

  11. Video on the Web • Streaming video very popular • Reduce start time significantly • Players • RealPlayer • Windows Media Player • QuickTime Player • File formats (AVI and MPEG)

  12. Video on the Web • Digital Video Professionals Association • www.dvpa.com

  13. Scanners • Buyer’s guide • www.zdnet.com/special/filters/sc/scanner • TWAIN • www.twain.org

  14. 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 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. "

  15. Scanning Demo • HP ScanJet Scanner 5370C Series • $230

More Related