MGMT 1030 Lecture Notes - Lecture 13: Mpeg-2, Image Scanner, Mpeg-4
6 May 2018
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MGMT 1030 Tutorial 13 Notes – Image and Video Input, Image scanning
Introduction
Image and Video Input
• The MPEG-2 and MPEG-4 formats store real-time video that produces movie quality
images, with the video data compressed to 30–60 megabytes or less of data per minute,
even for high definition images.
• Even the re-creation of the original images for display requires substantial computing
power.
• Although high-end modern personal computer systems have adequate processing
power to decode high-quality video data, many computer systems provide additional
hardware support for the reading, decoding, and displaying of real-time video data from
DVDs.
• Direct transmission of high-quality digital video data is still confined to very high-speed
networks and satellite systems.
• Of course the obvious input source for images and video these days is the Web.
• Still, those images and videos had to originate somewhere
• So e’ll take a rief look at the arious eas used to iput the ad oert the to
the digital formats that we use.
• Three classes of devices provide most of the imaging capability that we use.
Image scanning
• One common way to input image data is with an image scanner.
• Data from an image scanner takes the form of a bitmap that represents some sort of
image
• A graphic drawing, a photograph, magnetically inked numbers on a check, perhaps even
a document of printed text.
• The scanner electronically moves over the image, converting the image row by row into
a stream of binary numbers, each representing a pixel.
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