Page 28 - DCAP313_LAB_ON_COMPUTER_GRAPHICS

Lab on Computer Graphics

Notes Self Assessment Questions
1. …………… attempts to give users insight into complex information via visual display.
( a) 3D scanning (b) Image processing
( c) Virtual reality (d) Visualization
2. ……………….. is a related subcategory of visualization dealing with statistical graphics
and geographic that is abstracted in schematic form.
( a) Data visualization (b) Astrophysical visualization
( c) Medical visualization (d) Chemical visualization
3. ………………….. are several different techniques to visualize scientific data, with surface
reconstruction and direct volume rendering being the more common.
( a) Flow visualization (b) Astrophysical visualization
( c) Medical visualization (d) All of these
4. The primary components of an ………………… in a CRT are the heated metal cathode
and a control grid.
( a) focusing system (b) electron gun
( c) deflection system (d) CRT screen
5. Does not display controller interprets commands for plotting points, lines and characters
and sends digital and point coordinates to a vector generator.

( a) True (b) False
2.4 Raster Scan Systems

It consists of display controller, central processing unit (CPU), video controller, refresh buffer,
keyboard, mouse and the CRT.As shown in the fig the display image is stored in the form of
1s and 0s in the refresh buffer. The video controller reads this refresh buffer and creates the
actual image on the screen. It does this by scanning one scan line at a time, from top to bottom
and then back to the top.
Figure 2.6: Raster Scan Display Architecture

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