MGMT 1030 Lecture Notes - Lecture 14: Raster Scan, Input Device, Pointing Device
6 May 2018
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MGMT 1030 Tutorial 14 Notes – Graphical input using pointing devices, Digital cameras and
video capture devices
Introduction
Digital cameras and video capture devices
• Software in the computer then converts this raw data into one of the standard bitmap
data formats in use, adding appropriate metadata, applying data compression when
desired, reconfiguring the data as necessary, and storing the data as a file that is then
available for use.
• Digital cameras and video cameras can be used to capture bitmap images and video.
• An electronic raster scan mechanism is used to collect light and digitize the data from
the lens.
• Most modern cameras collect the data in a simple, vendor-specific so-called raw format.
• Because the amount of data generated for a single image in a modern camera is large (a
common value is 8.1 megapixels × 3 or more bytes per pixel for example), the camera
usually contains software to convert the raw data to a compressed JPEG or MPEG image
for storage and transfer to a computer.
• Some cameras allow the direct transfer of raw images to a computer for more precise
processing control
Graphical input using pointing devices
• Mice, pens, and other pointing devices can be used in conjunction with drawing or
painting programs to input graphical data.
• The input from most of these devices is a pair of binary numbers representing either X
and Y coordinates on the screen or relative movements in X and Y directions.
• Some drawing tablets also provide a measure of the pressure applied to the drawing
pen.
• The pointing device is an input device.
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